2947 lines
129 KiB
HTML
2947 lines
129 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
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<meta name="description" content="TCP: Out of Memory — Consider Tuning TCP_Mem including: DMESG Command, using APM and CPU, Java">
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<meta name="keywords" content="Transmission Control Protocol, memory, application">
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<meta property="og:description" content="TCP: Out of Memory — Consider Tuning TCP_Mem including: DMESG Command, using APM and CPU, Java">
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<meta property="og:title" content="TCP: Out of Memory — Consider Tuning TCP_Mem">
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<meta property="og:url" content="https://dzone.com/articles/tcp-out-of-memory-consider-tuning-tcp-mem">
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<link rel="canonical" href="https://dzone.com/articles/tcp-out-of-memory-consider-tuning-tcp-mem">
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<title>TCP: Out of Memory — Consider Tuning TCP_Mem</title>
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<link rel="preload" href="https://dz2cdn1.dzone.com/themes/dz20/font/fontello.woff?11773374" as="font" type="font/woff" crossorigin="anonymous">
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<link rel="stylesheet" media="all" href="https://dz2cdn1.dzone.com/themes/dz20/ftl/icons.css">
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<style>
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:root {
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/* Padding Quick-Access Classes */
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.pt-xs, .py-xs { padding-top: var(--xs-size); }
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/* Flex Quick-Access Classes */
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display: flex;
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flex-direction: column;
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}
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.flex-column-reverse {
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display: flex;
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flex-direction: column-reverse;
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}
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.flex-row {
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display: flex;
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flex-direction: row;
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}
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.flex-row-reverse {
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display: flex;
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flex-direction: row-reverse;
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}
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.flex-wrap {
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.flex-grow {
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flex-grow: 1;
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.align-center { align-items: center; }
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.content-center {
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align-content: center;
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}
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.justify-center { justify-content: center; }
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/* Display Quick-Access Classes */
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/* Consistent headings between h and non-h tags */
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display: -webkit-box;
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/* User-Select Quick-Access Classes */
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/* Position Quick-Access Classes */
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.va-top { vertical-align: top; }
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/* Transition Quick-Access Classes */
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transition: all 0.15s linear;
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/* Background Quick-Access Classes */
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/* Border Quick-Access Classes */
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.bt-none { border-top: none !important; }
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/* Border Radius Quick-Access Classes */
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.round-t-sm, .round-tl-sm { border-top-left-radius: var(--sm-border-size); }
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.round-sm { border-radius: var(--sm-border-size); }
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.round-fully { border-radius: 50%; }
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/* Misc Quick-Access Classes */
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.haikei {
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position: relative;
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background-image: url('https://dz2cdn1.dzone.com/themes/dz20/images/polygon-scatter-haikei-shapes.svg');
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background-repeat: no-repeat;
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background-size: cover;
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}
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.haikei:before {
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content: '';
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position:absolute;
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top: 0;
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left: 0;
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width: 100%;
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height: 100%;
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background-color: var(--color-event-background);
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z-index: -1;
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}
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.margin-auto-center {
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display: block;
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margin-left: auto;
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margin-right: auto;
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}
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display: flex;
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margin-left: auto;
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margin-right: auto;
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.h-separator {
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width: 100%;
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}
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.no-spacing {
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padding: 0 !important;
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}
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.inherit-color { color: inherit; }
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.inherit-decoration { text-decoration: inherit; }
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/* Table Quick-Access Classes */
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border-bottom: 1px solid #cccccc;
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table.full-width tr td:last-child {
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width:100%;
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}
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/* Animation Quick-Access Classes */
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@keyframes anim-spin {
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0% { transform: rotate(0deg); }
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100% { transform: rotate(359deg); }
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}
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.anim-spin {
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display: inline-block;
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animation: anim-spin 2s infinite linear;
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}
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.hov-pointer { cursor: pointer; }
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.hov-brighten:hover { filter: brightness(1.2); }
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.hov-darken:hover { filter: brightness(0.95); }
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.hov-underline:hover { text-decoration: underline; }
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/* Small tweaks related to components when using these styles */
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.nav-tabs {
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border-bottom: none;
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}
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.tab-content > .flex-column.active,
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.tab-content > .flex-row.active {
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display: flex;
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}
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/* Alpine components with x-cloak should not be visible by default until conditionals kick in */
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[x-cloak] { display: none !important; }
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</style>
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<link rel="stylesheet" media="all" href="https://dz2cdn1.dzone.com/themes/dz20/ftl/alpine-components/modal.css">
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|
||
<body x-data>
|
||
<div class="skybox skybox-closeBtn dz_skybox" data-gpt-slot="skybox" id="div-gpt-ad-1435246566686-99"></div>
|
||
<header id="ftl-header">
|
||
<div class="header-top">
|
||
<div class="header-container">
|
||
<div class="pull-left logo-container">
|
||
<div class="logo">
|
||
<a class="inner" href="/">
|
||
<picture>
|
||
<source srcset="https://dz2cdn1.dzone.com/themes/dz20/images/dz_logo_2021_cropped.webp" type="image/webp">
|
||
<source srcset="https://dz2cdn1.dzone.com/themes/dz20/images/dz_logo_2021_cropped.png" type="image/png">
|
||
<img src="https://dz2cdn1.dzone.com/themes/dz20/images/dz_logo_2021_cropped.png" width="181" height="56" alt="DZone">
|
||
</picture>
|
||
</a>
|
||
</div>
|
||
</div>
|
||
|
||
<div class="pull-right login-and-search">
|
||
<div id="authenticated-block" class="logged-in">
|
||
<div class="welcome-back">Thanks for visiting DZone today,</div>
|
||
<div id="user-header" class="user-info">
|
||
<button class="user-avatar">
|
||
<span id="header-username" class="username"></span>
|
||
<img id="header-avatar" src="" alt="user avatar">
|
||
</button>
|
||
<div id="user-dropdown" class="browse-user-menu">
|
||
<div class="user-content">
|
||
<a id="header-user-plug" href="#" class="user-description"></a>
|
||
<a id="header-user-edit" href="#" class="edit-profile">Edit Profile</a>
|
||
</div>
|
||
<ul class="user-actions">
|
||
<li id="first-user-action">
|
||
<a id="header-dropdown-manage-email" href="#">Manage Email Subscriptions</a>
|
||
</li>
|
||
<li>
|
||
<a href="/articles/how-to-submit-a-post-to-dzone?utm_source=DZone&utm_medium=user_dropdown&utm_campaign=how_to_post">
|
||
How to Post to DZone
|
||
</a>
|
||
</li>
|
||
<li>
|
||
<a href="/articles/dzones-article-submission-guidelines">
|
||
Article Submission Guidelines
|
||
</a>
|
||
</li>
|
||
</ul>
|
||
<div class="bottom">
|
||
<a href="/users/logout.html" class="sign-out">Sign Out</a>
|
||
<a id="dropdown-view-profile" href="#" class="view-profile">View Profile</a>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
<div class="post-content">
|
||
<button id="post-button" class="post-content--button">
|
||
<span class="post-class">Post</span>
|
||
<i class="icon-plus"></i>
|
||
</button>
|
||
|
||
<div id="post-menu" class="posting-links">
|
||
<div class="posting-links-menu">
|
||
<ul>
|
||
<li>
|
||
<img src="https://dz2cdn1.dzone.com/themes/dz20/images/dz-postarticle.svg" width="15" height="18" style="width: 15px; height: 18px;">
|
||
<a href="/content/article/post.html">Post an Article</a>
|
||
</li>
|
||
<li>
|
||
<a id="drafts-link" href="#">Manage My Drafts</a>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
<div id="unauthenticated-block">
|
||
<div class="dz-intro">Over 2 million developers have joined DZone.</div>
|
||
<div class="mobile-invisible sign-in-join">
|
||
<a href="/users/login.html">Log In</a>
|
||
<span class="dz-intro-span">/</span>
|
||
<a href="/static/registration.html">Join</a>
|
||
</div>
|
||
<a class="join-icon" href="/users/login.html" aria-label="User">
|
||
<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide svg-user lucide-user-icon lucide-user">
|
||
<path d="M19 21v-2a4 4 0 0 0-4-4H9a4 4 0 0 0-4 4v2"></path>
|
||
<circle cx="12" cy="7" r="4"></circle>
|
||
</svg>
|
||
</a>
|
||
</div>
|
||
|
||
<script>
|
||
document.addEventListener('alpine:init', () => {
|
||
Alpine.data('searchDrawer', () => ({
|
||
open: false,
|
||
query: '',
|
||
minCharsMet: false,
|
||
|
||
toggleVisibility() {
|
||
this.open = !this.open;
|
||
if (this.open) {
|
||
this.$nextTick(() => {
|
||
this.$refs.query.focus();
|
||
});
|
||
}
|
||
},
|
||
|
||
updateSearchValue() {
|
||
if (!this.query || !this.query.length || this.query.length < 3) {
|
||
this.minCharsMet = false;
|
||
return;
|
||
}
|
||
this.minCharsMet = true;
|
||
localStorage.setItem('ls.searchValue', this.query);
|
||
},
|
||
|
||
searchSite() {
|
||
if (this.minCharsMet) {
|
||
window.location = '/search';
|
||
}
|
||
}
|
||
}));
|
||
});
|
||
</script>
|
||
|
||
<div class="headerSearch" x-data="searchDrawer()" x-cloak>
|
||
<button class="btn-search dropdown-toggle" x-on:click="toggleVisibility()" aria-label="Search">
|
||
<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide svg-search lucide-search-icon lucide-search">
|
||
<path d="m21 21-4.34-4.34"></path>
|
||
<circle cx="11" cy="11" r="8"></circle>
|
||
</svg>
|
||
</button>
|
||
<template x-teleport=".header-container">
|
||
<div id="search-drawer" x-show="open" x-on:click.outside="open = false" x-transition>
|
||
<div class="search-input">
|
||
<input type="text"
|
||
placeholder="Search"
|
||
autofocus="autofocus"
|
||
x-model="query"
|
||
x-ref="query"
|
||
x-on:input.change="updateSearchValue()"
|
||
x-on:keyup.enter="searchSite()"
|
||
>
|
||
<button x-on:click="searchSite()" x-bind:disabled="!minCharsMet">
|
||
<span>Search</span>
|
||
</button>
|
||
</div>
|
||
<div class="search-footer">
|
||
Please enter at least three characters to search
|
||
</div>
|
||
</div>
|
||
</template>
|
||
</div>
|
||
</div>
|
||
</div> </div>
|
||
<div class="header-bottom">
|
||
<div class="header-bottom-container">
|
||
<a class="resource-link" href="/refcardz">Refcards</a>
|
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<a class="resource-link" href="/trendreports">Trend Reports</a>
|
||
<div class="resource-link link-menu">
|
||
<a href="/events">Events</a>
|
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<a href="/events/video-library">Video Library</a>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<nav class="header-menu-bar">
|
||
<div class="header-menu resource-category">
|
||
<a href="/refcardz">Refcards</a>
|
||
</div>
|
||
<div class="header-menu-separator resource-category-separator"></div>
|
||
<div class="header-menu resource-category">
|
||
<a href="/trendreports">Trend Reports</a>
|
||
</div>
|
||
<div class="header-menu-separator resource-category-separator"></div>
|
||
<div class="header-menu resource-category no-bottom-radius" data-click-activation>
|
||
<p class="menu-label">Events</p>
|
||
<div class="header-menu-items">
|
||
<div class="header-menu-columns">
|
||
<a class="header-menu-item" href="/events">View Events</a>
|
||
<a class="header-menu-item" href="/events/video-library">Video Library</a>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<div class="header-menu zone-menu" data-click-activation>
|
||
<p class="menu-label">Zones <i class="icon-down-dir icon-closed"></i><i class="icon-right-dir icon-open"></i></p>
|
||
<div class="header-menu-items">
|
||
<div class="header-menu-columns">
|
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<div class="header-menu-column-item">
|
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<a class="header-menu-item" href="/culture-and-methodologies">Culture and Methodologies</a>
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<a class="header-menu-item" href="/agile">Agile</a>
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<a class="header-menu-item" href="/career-development">Career Development</a>
|
||
<a class="header-menu-item" href="/methodologies">Methodologies</a>
|
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<a class="header-menu-item" href="/team-management">Team Management</a>
|
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</div>
|
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<div class="header-menu-column-item">
|
||
<a class="header-menu-item" href="/data-engineering">Data Engineering</a>
|
||
<a class="header-menu-item" href="/ai-ml">AI/ML</a>
|
||
<a class="header-menu-item" href="/big-data">Big Data</a>
|
||
<a class="header-menu-item" href="/data">Data</a>
|
||
<a class="header-menu-item" href="/databases">Databases</a>
|
||
<a class="header-menu-item" href="/iot">IoT</a>
|
||
</div>
|
||
<div class="header-menu-column-item">
|
||
<a class="header-menu-item" href="/software-design-and-architecture">Software Design and Architecture</a>
|
||
<a class="header-menu-item" href="/cloud-architecture">Cloud Architecture</a>
|
||
<a class="header-menu-item" href="/containers">Containers</a>
|
||
<a class="header-menu-item" href="/integration">Integration</a>
|
||
<a class="header-menu-item" href="/microservices">Microservices</a>
|
||
<a class="header-menu-item" href="/performance">Performance</a>
|
||
<a class="header-menu-item" href="/security">Security</a>
|
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</div>
|
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<div class="header-menu-column-item">
|
||
<a class="header-menu-item" href="/coding">Coding</a>
|
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<a class="header-menu-item" href="/frameworks">Frameworks</a>
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<a class="header-menu-item" href="/java">Java</a>
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<a class="header-menu-item" href="/javascript">JavaScript</a>
|
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<a class="header-menu-item" href="/languages">Languages</a>
|
||
<a class="header-menu-item" href="/tools">Tools</a>
|
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</div>
|
||
<div class="header-menu-column-item">
|
||
<a class="header-menu-item" href="/testing-deployment-and-maintenance">Testing, Deployment, and Maintenance</a>
|
||
<a class="header-menu-item" href="/deployment">Deployment</a>
|
||
<a class="header-menu-item" href="/devops-and-cicd">DevOps and CI/CD</a>
|
||
<a class="header-menu-item" href="/maintenance">Maintenance</a>
|
||
<a class="header-menu-item" href="/monitoring-and-observability">Monitoring and Observability</a>
|
||
<a class="header-menu-item" href="/testing-tools-and-frameworks">Testing, Tools, and Frameworks</a>
|
||
</div>
|
||
<div class="header-menu-column-item sponsored">
|
||
<a class="header-menu-item" href="javascript:void(0)">Partner Zones</a>
|
||
<a class="header-menu-item" href="/hubs/build-ai-agents-that-are-ready-for-production/">Build AI Agents That Are Ready for Production</a>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<div class="header-menu parent-category" tabindex="1">
|
||
<a href="/culture-and-methodologies">Culture and Methodologies</a>
|
||
<div class="header-menu-items">
|
||
<a class="header-menu-item" href="/agile">Agile</a>
|
||
<a class="header-menu-item" href="/career-development">Career Development</a>
|
||
<a class="header-menu-item" href="/methodologies">Methodologies</a>
|
||
<a class="header-menu-item" href="/team-management">Team Management</a>
|
||
</div>
|
||
</div>
|
||
<div class="header-menu-separator parent-category-separator"></div>
|
||
<div class="header-menu parent-category" tabindex="2">
|
||
<a href="/data-engineering">Data Engineering</a>
|
||
<div class="header-menu-items">
|
||
<a class="header-menu-item" href="/ai-ml">AI/ML</a>
|
||
<a class="header-menu-item" href="/big-data">Big Data</a>
|
||
<a class="header-menu-item" href="/data">Data</a>
|
||
<a class="header-menu-item" href="/databases">Databases</a>
|
||
<a class="header-menu-item" href="/iot">IoT</a>
|
||
</div>
|
||
</div>
|
||
<div class="header-menu-separator parent-category-separator"></div>
|
||
<div class="header-menu parent-category" tabindex="3">
|
||
<a href="/software-design-and-architecture">Software Design and Architecture</a>
|
||
<div class="header-menu-items">
|
||
<a class="header-menu-item" href="/cloud-architecture">Cloud Architecture</a>
|
||
<a class="header-menu-item" href="/containers">Containers</a>
|
||
<a class="header-menu-item" href="/integration">Integration</a>
|
||
<a class="header-menu-item" href="/microservices">Microservices</a>
|
||
<a class="header-menu-item" href="/performance">Performance</a>
|
||
<a class="header-menu-item" href="/security">Security</a>
|
||
</div>
|
||
</div>
|
||
<div class="header-menu-separator parent-category-separator"></div>
|
||
<div class="header-menu parent-category" tabindex="4">
|
||
<a href="/coding">Coding</a>
|
||
<div class="header-menu-items">
|
||
<a class="header-menu-item" href="/frameworks">Frameworks</a>
|
||
<a class="header-menu-item" href="/java">Java</a>
|
||
<a class="header-menu-item" href="/javascript">JavaScript</a>
|
||
<a class="header-menu-item" href="/languages">Languages</a>
|
||
<a class="header-menu-item" href="/tools">Tools</a>
|
||
</div>
|
||
</div>
|
||
<div class="header-menu-separator parent-category-separator"></div>
|
||
<div class="header-menu parent-category" tabindex="5">
|
||
<a href="/testing-deployment-and-maintenance">Testing, Deployment, and Maintenance</a>
|
||
<div class="header-menu-items">
|
||
<a class="header-menu-item" href="/deployment">Deployment</a>
|
||
<a class="header-menu-item" href="/devops-and-cicd">DevOps and CI/CD</a>
|
||
<a class="header-menu-item" href="/maintenance">Maintenance</a>
|
||
<a class="header-menu-item" href="/monitoring-and-observability">Monitoring and Observability</a>
|
||
<a class="header-menu-item" href="/testing-tools-and-frameworks">Testing, Tools, and Frameworks</a>
|
||
</div>
|
||
</div>
|
||
<div class="header-menu-separator parent-category-separator"></div>
|
||
<div class="header-menu parent-category sponsored" tabindex="6">
|
||
<a href="javascript:void(0)">Partner Zones</a>
|
||
<div class="header-menu-items sponsored">
|
||
<a class="header-menu-item" href="/hubs/build-ai-agents-that-are-ready-for-production/">Build AI Agents That Are Ready for Production</a>
|
||
</div>
|
||
</div>
|
||
<div class="header-menu-separator parent-category-separator"></div>
|
||
</nav>
|
||
</header>
|
||
|
||
<script>
|
||
const csrf = {
|
||
parameter: 'TH_CSRF',
|
||
header: 'X-TH-CSRF',
|
||
token: '-4150556961824236159'
|
||
}; // set csrf for auth-status script
|
||
</script>
|
||
<script>
|
||
addEventListener('DOMContentLoaded', function() {
|
||
handleRedirects();
|
||
handleMenus();
|
||
handleMobileMenuHeights();
|
||
handleGotoLinks();
|
||
});
|
||
|
||
function isHidden(element) {
|
||
try {
|
||
return window.getComputedStyle(element).display === 'none';
|
||
} catch (_) {
|
||
return false;
|
||
}
|
||
}
|
||
|
||
function getLink(element) {
|
||
if (element.hasAttribute('data-goto')) {
|
||
return element.getAttribute('data-goto');
|
||
}
|
||
return element.href;
|
||
}
|
||
|
||
function isLeftClick(event) {
|
||
if (event.altKey || event.shiftKey) {
|
||
return false;
|
||
} else if ('buttons' in event || 'which' in event) {
|
||
return event.buttons === 1 || event.which === 1;
|
||
} else {
|
||
return (event.button === 1 || (event.type === 'click'));
|
||
}
|
||
}
|
||
|
||
function handleRedirects() {
|
||
const redirections = [...document.querySelectorAll('[data-activate-menu]'), ...document.querySelectorAll('[data-click-target]')];
|
||
|
||
redirections.forEach(function(element) {
|
||
const menuSelector = element.getAttribute('data-activate-menu') || element.getAttribute('data-click-target');
|
||
const redirectingElement = document.querySelector(menuSelector);
|
||
if (redirectingElement) {
|
||
element.style.cursor = 'pointer';
|
||
const redirect = function(e) {
|
||
if (redirectingElement.hasAttribute('href') || redirectingElement.hasAttribute('data-goto')) {
|
||
if (redirectingElement.hasAttribute('data-new-window') || e.ctrlKey || e.metaKey) {
|
||
window.open(getLink(redirectingElement), '_blank');
|
||
} else {
|
||
window.open(getLink(redirectingElement), '_self');
|
||
}
|
||
} else {
|
||
const evt = new e.constructor(e.type, e);
|
||
redirectingElement.dispatchEvent(evt);
|
||
}
|
||
};
|
||
element.addEventListener('mouseup', redirect);
|
||
element.addEventListener('mousedown', (e) => e.preventDefault());
|
||
element.addEventListener('click', (e) => e.preventDefault());
|
||
}
|
||
});
|
||
}
|
||
|
||
function handleMenus() {
|
||
const menuElements = [
|
||
...document.querySelectorAll('.header-menu > a'),
|
||
...document.querySelectorAll('.header-menu > p.menu-label')
|
||
];
|
||
|
||
let scrollYMemory = -1;
|
||
|
||
function scrollToMemory() {
|
||
if (scrollYMemory !== -1) {
|
||
setTimeout(function() {
|
||
window.scrollTo(0, scrollYMemory);
|
||
scrollYMemory = -1;
|
||
}, 10);
|
||
}
|
||
}
|
||
|
||
function hideMenus() {
|
||
// unfocus menus & items, and set the menus to non-visible.
|
||
menuElements.forEach(function (element) {
|
||
element.blur();
|
||
element.parentElement.blur();
|
||
element.parentElement.classList.remove('menu-opened');
|
||
const menuItems = element.parentElement.querySelector('.header-menu-items');
|
||
if (menuItems) {
|
||
menuItems.style.display = 'none';
|
||
}
|
||
});
|
||
const wasHidden = document.body.style.overflowY === 'hidden';
|
||
document.body.style.overflowY = 'auto';
|
||
if (wasHidden) {
|
||
scrollToMemory();
|
||
}
|
||
}
|
||
|
||
function isEventOutsideMenu(e) {
|
||
return e.target.closest && !e.target.closest('.header-menu') && !e.target.closest('[data-activate-menu]');
|
||
}
|
||
|
||
// Handle mobile menu toggling
|
||
menuElements.forEach(function(element) {
|
||
const menu = element.parentElement;
|
||
const headerItems = menu.querySelector('.header-menu-items');
|
||
const menuEntries = headerItems ? headerItems.querySelectorAll('.header-menu-item') : [];
|
||
|
||
const focus = function() {
|
||
menu.focus();
|
||
menu.classList.add('menu-opened');
|
||
if (headerItems) {
|
||
headerItems.style.display = 'block';
|
||
}
|
||
if (menu.classList.contains('zone-menu')) {
|
||
scrollYMemory = window.scrollY;
|
||
document.body.style.overflowY = 'hidden';
|
||
} else {
|
||
scrollYMemory = -1;
|
||
}
|
||
};
|
||
|
||
const unfocus = function() {
|
||
menu.blur();
|
||
menu.classList.remove('menu-opened');
|
||
if (headerItems) {
|
||
headerItems.style.display = 'none';
|
||
}
|
||
const wasHidden = document.body.style.overflowY === 'hidden';
|
||
document.body.style.overflowY = 'auto';
|
||
if (wasHidden) {
|
||
scrollToMemory();
|
||
}
|
||
};
|
||
|
||
const toggleMenuVisibility = function(e) {
|
||
if ((e.type === 'click' || e.type === 'mouseup') && !isLeftClick(e)) {
|
||
e.preventDefault();
|
||
return;
|
||
}
|
||
const hidden = isHidden(headerItems);
|
||
if (menu.hasAttribute('data-click-activation')) { // handle click activated toggling
|
||
if (hidden) {
|
||
hideMenus(); // hide other open menus first
|
||
focus();
|
||
} else {
|
||
unfocus();
|
||
}
|
||
e.preventDefault();
|
||
} else if (hidden) {
|
||
hideMenus(); // hide other open menus first
|
||
focus();
|
||
e.preventDefault(); // prevent 'click' event from firing when menu is hidden
|
||
}
|
||
};
|
||
|
||
element.addEventListener('touchend', toggleMenuVisibility);
|
||
element.addEventListener('mouseup', toggleMenuVisibility);
|
||
|
||
// Add hover events to non-click-activated menus, even though CSS should cover it.
|
||
if (!menu.hasAttribute('data-click-activation')) {
|
||
menu.addEventListener('mouseover', function () {
|
||
hideMenus(); // hide other open menus first
|
||
focus();
|
||
});
|
||
|
||
menu.addEventListener('mouseout', function (e) {
|
||
if (isEventOutsideMenu(e)) {
|
||
unfocus();
|
||
}
|
||
});
|
||
}
|
||
|
||
// Hide menu when child is clicked
|
||
menuEntries.forEach(function(menuEntry) {
|
||
const linkToItem = function(e) {
|
||
if (e.type === 'mousedown' || e.type === 'click') {
|
||
e.preventDefault();
|
||
return;
|
||
}
|
||
if (e.type === 'mouseup' && !isLeftClick(e)) {
|
||
e.preventDefault();
|
||
return;
|
||
}
|
||
window.open(getLink(menuEntry), (e.ctrlKey || e.metaKey) ? '_blank' : (menuEntry.target || '_self'));
|
||
unfocus();
|
||
e.preventDefault();
|
||
};
|
||
|
||
const linkToMobileItem = function(e) {
|
||
if (e.type === 'touchstart') {
|
||
menuEntry.setAttribute('data-touchmove', false);
|
||
} else if (e.type === 'touchmove') {
|
||
menuEntry.setAttribute('data-touchmove', true);
|
||
} else if (e.type === 'touchend' && (!menuEntry.hasAttribute('data-touchmove') || menuEntry.getAttribute('data-touchmove').toLowerCase() === 'false')) {
|
||
window.open(getLink(menuEntry), (e.ctrlKey || e.metaKey) ? '_blank' : (menuEntry.target || '_self'));
|
||
unfocus();
|
||
e.preventDefault();
|
||
}
|
||
};
|
||
|
||
menuEntry.addEventListener('mousedown', linkToItem);
|
||
menuEntry.addEventListener('mouseup', linkToItem);
|
||
menuEntry.addEventListener('click', linkToItem);
|
||
menuEntry.addEventListener('touchstart', linkToMobileItem);
|
||
menuEntry.addEventListener('touchmove', linkToMobileItem);
|
||
menuEntry.addEventListener('touchend', linkToMobileItem);
|
||
});
|
||
});
|
||
|
||
function hideIfNonMenuBounds(e) {
|
||
if (isEventOutsideMenu(e)) {
|
||
hideMenus();
|
||
}
|
||
}
|
||
|
||
addEventListener('mousemove', hideIfNonMenuBounds);
|
||
addEventListener('touchend', hideIfNonMenuBounds);
|
||
addEventListener('mouseup', hideIfNonMenuBounds);
|
||
addEventListener('mousedown', hideIfNonMenuBounds);
|
||
addEventListener('click', hideIfNonMenuBounds);
|
||
}
|
||
|
||
function handleMobileMenuHeights() {
|
||
function setAppHeight() {
|
||
document.documentElement.style.setProperty('--app-height', window.innerHeight + 'px');
|
||
}
|
||
|
||
addEventListener('resize', function() {
|
||
setAppHeight();
|
||
});
|
||
|
||
setAppHeight();
|
||
}
|
||
|
||
function handleGotoLinks() {
|
||
// Add anchor mimicking to elements with data-goto attributes
|
||
// This addresses SEO concerns of linking to noindex pages by allowing JS to handle the URL
|
||
const anchorElements = document.querySelectorAll('*[data-goto]');
|
||
anchorElements.forEach((anchorElement) => {
|
||
anchorElement.addEventListener('mouseover', () => {
|
||
anchorElement.style.cursor = 'pointer';
|
||
anchorElement.style.textDecoration = 'underline';
|
||
});
|
||
anchorElement.addEventListener('mouseout', () => {
|
||
anchorElement.style.cursor = 'unset';
|
||
anchorElement.style.textDecoration = 'unset';
|
||
});
|
||
anchorElement.addEventListener('mouseup', (e) => {
|
||
e.preventDefault();
|
||
});
|
||
anchorElement.addEventListener('mousedown', (e) => {
|
||
e.preventDefault();
|
||
});
|
||
anchorElement.addEventListener('click', (e) => {
|
||
e.preventDefault();
|
||
const anchorHref = anchorElement.getAttribute('data-goto');
|
||
if (anchorElement.hasAttribute('data-new-window') || e.ctrlKey || e.metaKey) {
|
||
window.open(anchorHref, '_blank');
|
||
} else {
|
||
window.open(anchorHref, '_self');
|
||
}
|
||
});
|
||
});
|
||
}
|
||
</script><script>
|
||
const authenticatedBlock = document.querySelector('#authenticated-block');
|
||
const unauthenticatedBlock = document.querySelector('#unauthenticated-block');
|
||
|
||
let authenticated = {
|
||
isAuthenticated: false,
|
||
isAdmin: false,
|
||
user: {
|
||
id: null,
|
||
name: null,
|
||
url: null,
|
||
profileImage: null,
|
||
}
|
||
};
|
||
|
||
fetch('/services/internal/data/articles-getAuthenticationStatus', {
|
||
headers: {
|
||
'Accept': 'application/json'
|
||
}
|
||
})
|
||
.then(function (result) {
|
||
return result.json()
|
||
})
|
||
.then(function (result) {
|
||
const res = result.result.data
|
||
if (!res.authenticated) {
|
||
unauthenticatedBlock.classList.add('shown')
|
||
} else {
|
||
authenticated.user.id = res.id;
|
||
authenticated.user.name = res.realName;
|
||
authenticated.user.url = res.profileUrl;
|
||
authenticated.user.profileImage = res.avatar;
|
||
authenticated.user.jobTitle = res.jobTitle;
|
||
authenticated.user.companyName = res.companyName;
|
||
|
||
bindProps('#header-username', null, null, (res.firstName || res.username), null)
|
||
bindProps('#header-avatar', null, res.avatar, null, null)
|
||
bindProps('#header-user-plug', res.profileUrl, null, res.realName, null)
|
||
bindProps('#header-user-edit', '/users/' + res.id + '/edit.html', null, null, null)
|
||
bindProps('#header-dropdown-manage-email', '/newsletters/' + res.id + '/manage.html', null, null, null)
|
||
bindProps('#dropdown-view-profile', res.profileUrl, null, null, null)
|
||
bindProps('#drafts-link', '/users/' + res.id + '/drafts.html', null, null, null)
|
||
|
||
if (res.isAdmin) {
|
||
// Construct backwards so the #after call places elements in the correct order
|
||
const firstUserAction = document.querySelector('#first-user-action')
|
||
const adminConsoleItem = document.createElement('li')
|
||
const adminConsoleLink = createLink('/dzone/staff/index.html', 'Admin Console')
|
||
adminConsoleItem.appendChild(adminConsoleLink)
|
||
firstUserAction.after(adminConsoleItem)
|
||
|
||
const moderationItem = document.createElement('li')
|
||
const moderationLink = createLink('/moderation/list.html', 'Moderation')
|
||
moderationItem.appendChild(moderationLink)
|
||
firstUserAction.after(moderationItem)
|
||
|
||
const bountyModerationItem = document.createElement('li')
|
||
const bountyModerationLink = createLink('/moderation/bounties', 'Bounty Moderation')
|
||
bountyModerationItem.appendChild(bountyModerationLink)
|
||
firstUserAction.after(bountyModerationItem)
|
||
}
|
||
|
||
authenticated.isAuthenticated = res.authenticated;
|
||
authenticated.isAdmin = res.isAdmin;
|
||
|
||
authenticatedBlock.classList.add('shown')
|
||
}
|
||
}).catch(function (result) {
|
||
console.error(result)
|
||
})
|
||
|
||
/**
|
||
* Binds different properties to the selected element.
|
||
*
|
||
* @param selector - Selector to select the element
|
||
* @param href - href attribute value
|
||
* @param src - src attribute value
|
||
* @param innerHTML - innerHTML property value
|
||
* @param innerText - innerText property value
|
||
*/
|
||
function bindProps(selector, href, src, innerHTML, innerText) {
|
||
const element = document.querySelector(selector)
|
||
if (element) {
|
||
if (href) element.href = href
|
||
if (src) element.src = src
|
||
if (innerHTML) element.innerHTML = innerHTML
|
||
if (innerText) element.innerText = innerText
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Creates a new link element.
|
||
*
|
||
* @param href - href attribute value
|
||
* @param innerText - innerText property value
|
||
* @returns {HTMLAnchorElement} The generated link element
|
||
*/
|
||
function createLink(href, innerText) {
|
||
const link = document.createElement('a')
|
||
link.href = href
|
||
link.innerText = innerText
|
||
|
||
return link
|
||
}
|
||
</script><script>
|
||
const userHeader = document.querySelector('#user-header')
|
||
const userDropdown = document.querySelector('#user-dropdown')
|
||
const postDropdown = document.querySelector('#post-button')
|
||
const postMenu = document.querySelector('#post-menu')
|
||
|
||
let userDropdownOpen = false
|
||
let postDropdownOpen = false
|
||
|
||
document.addEventListener('click', function(event) {
|
||
if (postDropdown && postDropdown.contains(event.target)) {
|
||
setUserDropdown(false)
|
||
setPostDropdown(!postDropdownOpen)
|
||
} else if (userHeader && userHeader.contains(event.target)) {
|
||
setPostDropdown(false)
|
||
setUserDropdown(!userDropdownOpen)
|
||
} else {
|
||
setUserDropdown(false)
|
||
setPostDropdown(false)
|
||
}
|
||
})
|
||
|
||
function setUserDropdown(value) {
|
||
userDropdownOpen = value
|
||
if (userDropdownOpen) {
|
||
if (userDropdown) {
|
||
userDropdown.classList.add('open')
|
||
}
|
||
} else {
|
||
if (userDropdown) {
|
||
userDropdown.classList.remove('open')
|
||
}
|
||
}
|
||
}
|
||
|
||
function setPostDropdown(value) {
|
||
postDropdownOpen = value
|
||
if (postDropdownOpen) {
|
||
if (postMenu) {
|
||
postMenu.classList.add('open')
|
||
}
|
||
} else {
|
||
if (postMenu) {
|
||
postMenu.classList.remove('open')
|
||
}
|
||
}
|
||
}
|
||
</script><script>
|
||
document.addEventListener("alpine:init", () => {
|
||
Alpine.store('global', {
|
||
executeHttp(path, body, method) {
|
||
const options = {
|
||
method: method,
|
||
headers: {
|
||
[csrf.header]: csrf.token
|
||
}
|
||
};
|
||
|
||
if (method !== 'GET') {
|
||
options.body = JSON.stringify(body);
|
||
options.headers = {
|
||
...options.headers,
|
||
'Content-Type': 'application/json; charset=UTF-8'
|
||
};
|
||
}
|
||
|
||
return new Promise((resolve, reject) => {
|
||
fetch(path, options)
|
||
.then(res => {
|
||
if (!res.ok) {
|
||
reject(res);
|
||
} else {
|
||
resolve(res);
|
||
}
|
||
})
|
||
.catch(err => reject(err));
|
||
});
|
||
},
|
||
getFromService(path) {
|
||
return this.executeHttp(path, null, 'GET');
|
||
},
|
||
postToService(path, body = {}) {
|
||
return this.executeHttp(path, body, 'POST');
|
||
},
|
||
putToService(path, body = {}) {
|
||
return this.executeHttp(path, body, 'PUT');
|
||
}
|
||
});
|
||
});
|
||
</script>
|
||
<link rel="stylesheet" media="all" href="https://dz2cdn1.dzone.com/themes/dz20/ftl/colors.css">
|
||
<link rel="stylesheet" media="all" href="https://dz2cdn1.dzone.com/themes/dz20/ftl/article/styles.css">
|
||
|
||
|
||
|
||
|
||
|
||
<div id="body-container">
|
||
<div id="announcement-container-outer">
|
||
<div id="announcement-previous">
|
||
<i class="icon-angle-left"></i>
|
||
</div>
|
||
<div id="announcement-next">
|
||
<i class="icon-angle-right"></i>
|
||
</div>
|
||
<div id="announcement-container">
|
||
<div class="announcement announcement-count-1"
|
||
data-position="1">
|
||
<div class="body"><p><strong>Could your team report a vulnerability within 24 hours? </strong>Find out on September 23.</p></div>
|
||
<div class="spacer"></div>
|
||
<a href="https://cvent.me/O32zXR?utm_source=Announcements&utm_medium=DzoneWeb&utm_campaign=QtGroup-0923" target="_blank">
|
||
<button>Assess Your CRA Readiness</button>
|
||
</a>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<script type="text/javascript" async>
|
||
(function() {
|
||
let announcementPosition = 1;
|
||
let minAnnouncementPosition = -1;
|
||
let maxAnnouncementPosition = -1;
|
||
|
||
const announcementPrevBtn = document.querySelector('#announcement-previous');
|
||
const announcementNextBtn = document.querySelector('#announcement-next');
|
||
|
||
function withAnnouncements(callback) {
|
||
const announcements = document.querySelectorAll('#announcement-container .announcement');
|
||
for (let announcement of announcements) {
|
||
callback(announcement);
|
||
}
|
||
}
|
||
|
||
function initAnnouncementVars() {
|
||
document.querySelector(':root').style.setProperty('--mobile-announcement-separator-width', '1px');
|
||
withAnnouncements(function(announcement) {
|
||
const pos = parseInt(announcement.getAttribute('data-position'));
|
||
minAnnouncementPosition = minAnnouncementPosition === -1 ? pos : Math.min(minAnnouncementPosition, pos);
|
||
maxAnnouncementPosition = maxAnnouncementPosition === -1 ? pos : Math.max(maxAnnouncementPosition, pos);
|
||
});
|
||
|
||
if (document.querySelector('.announcementBarContainer')) {
|
||
document.querySelector(':root').style.setProperty('--body-top-padding', '0');
|
||
}
|
||
|
||
if (maxAnnouncementPosition <= 0) {
|
||
document.querySelector(':root').style.setProperty('--body-top-padding', '0');
|
||
}
|
||
|
||
sizeToFullWhenOneEntryOnMobile();
|
||
}
|
||
|
||
function setAnnouncementPosition(position) {
|
||
if (window.outerWidth >= 890) {
|
||
return; // we do not need to change the position, since we can display everything on desktop.
|
||
}
|
||
|
||
// Make the announcement cyclical
|
||
if (minAnnouncementPosition !== -1 && maxAnnouncementPosition !== -1) {
|
||
if (position > maxAnnouncementPosition) {
|
||
position = minAnnouncementPosition; // overflow to the first announcement
|
||
} else if (position < minAnnouncementPosition) {
|
||
position = maxAnnouncementPosition; // underflow to the last announcement
|
||
}
|
||
announcementPosition = position;
|
||
}
|
||
|
||
const shownAnnouncements = [];
|
||
|
||
let reverseFlex = false; // should only be true when the first and last items are showing
|
||
|
||
// Now that the position is valid, apply the transforms
|
||
withAnnouncements(function(announcement) {
|
||
const pos = parseInt(announcement.getAttribute('data-position'));
|
||
const isWrapped = position === maxAnnouncementPosition && pos === minAnnouncementPosition; // showing first + last at same time
|
||
const doesNextQualify = window.outerWidth >= 500 && (pos === position + 1 || isWrapped);
|
||
|
||
if (pos === position || doesNextQualify) {
|
||
shownAnnouncements.push(announcement);
|
||
} else {
|
||
announcement.style.display = 'none';
|
||
}
|
||
|
||
announcement.style.opacity = 0.0;
|
||
|
||
if (isWrapped) {
|
||
reverseFlex = true;
|
||
}
|
||
});
|
||
|
||
for (let announcement of shownAnnouncements) {
|
||
announcement.style.display = 'flex';
|
||
announcement.style.opacity = 1.0;
|
||
}
|
||
|
||
const announcementContainer = document.querySelector('#announcement-container');
|
||
if (announcementContainer) {
|
||
announcementContainer.style.flexDirection = reverseFlex ? 'row-reverse' : 'row';
|
||
}
|
||
}
|
||
|
||
function resetAnnouncements() {
|
||
announcementPosition = 1;
|
||
const announcementContainer = document.querySelector('#announcement-container');
|
||
if (announcementContainer) {
|
||
announcementContainer.style.flexDirection = 'row';
|
||
}
|
||
withAnnouncements(function(announcement) {
|
||
announcement.style.opacity = 1.0;
|
||
announcement.style.display = 'flex';
|
||
});
|
||
}
|
||
|
||
function sizeToFullWhenOneEntryOnMobile() {
|
||
if (maxAnnouncementPosition <= 2 && announcementPrevBtn && announcementNextBtn) {
|
||
announcementPrevBtn.style.display = maxAnnouncementPosition === 2 && window.outerWidth < 500 ? 'flex' : 'none';
|
||
announcementNextBtn.style.display = maxAnnouncementPosition === 2 && window.outerWidth < 500 ? 'flex' : 'none';
|
||
}
|
||
if (maxAnnouncementPosition === 1 && window.outerWidth >= 500 && window.outerWidth < 890) {
|
||
document.querySelector(':root').style.setProperty('--mobile-announcement-separator-width', '0');
|
||
document.querySelector('#announcement-container .announcement').style.maxWidth = '100%';
|
||
}
|
||
}
|
||
|
||
function resetAnnouncementsOnResize() {
|
||
announcementPosition = 1; // we want to reset the announcement position every resize
|
||
if (window.outerWidth >= 890) { // 4 announcements can be shown (215px * 4) + separator padding
|
||
resetAnnouncements();
|
||
} else { // if we're still on mobile, set the position to normalize things after resize
|
||
setAnnouncementPosition(announcementPosition);
|
||
sizeToFullWhenOneEntryOnMobile();
|
||
}
|
||
}
|
||
|
||
window.addEventListener('resize', resetAnnouncementsOnResize);
|
||
|
||
initAnnouncementVars();
|
||
setAnnouncementPosition(announcementPosition); // sets the min & max positions as well as initializes transforms
|
||
|
||
if (announcementPrevBtn) {
|
||
announcementPrevBtn.onclick = function() {
|
||
setAnnouncementPosition(announcementPosition - 1);
|
||
};
|
||
}
|
||
|
||
if (announcementNextBtn) {
|
||
announcementNextBtn.onclick = function() {
|
||
setAnnouncementPosition(announcementPosition + 1);
|
||
};
|
||
}
|
||
})(); </script>
|
||
<div id="ftl-article" class="trending-article-body">
|
||
<aside class="trending-sidebar" aria-labelledby="related-sidebar-heading">
|
||
<div class="trending">
|
||
<h2 id="related-sidebar-heading">Related</h2>
|
||
<div class="trending-separator"></div>
|
||
<ul>
|
||
<li class="item">
|
||
<a href="/articles/troubleshooting-memory-leaks-deep-dive-into-common-heap-profilers" class="related-link">Troubleshooting Memory Leaks With Heap Profilers</a>
|
||
</li>
|
||
<li class="item">
|
||
<a href="/articles/anypoint-runtime-fabric-basic-but-crucial-points-f" class="related-link">Anypoint Runtime Fabric Basic vs. Crucial Points for Planning Resources</a>
|
||
</li>
|
||
<li class="item">
|
||
<a href="/articles/javaspring-bootmongodb-performance-analysis-and-im" class="related-link">Java, Spring Boot, and MongoDB: Performance Analysis and Improvements</a>
|
||
</li>
|
||
<li class="item">
|
||
<a href="/articles/hardware-optimization-best-practices-for-database" class="related-link">Hardware Optimization: Best Practices for Database Performance Boost</a>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</aside>
|
||
<div class="container-fluid body trending-article-fluid">
|
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<div class="row">
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"articleBody": "What happens when you're out of memory? You may also like: Java Out of Memory Heap Analysis Recently we experienced an interesting production problem. This application was running on multiple AWS EC2 instances behind Elastic Load Balancer. The application was running on a GNU/Linux OS, Java 8, Tomcat 8 application server. All of a sudden, one of the application instances became unresponsive. All other application instances were handling the traffic properly. Whenever the HTTP request was sent to this application instance from the browser, we were getting the following response to be printed on the browser. Proxy Error The proxy server received an invalid response from an upstream server. The proxy server could not handle the request GET /. Reason: Error reading from remote server We used our APM (Application Performance Monitoring) tool to examine the problem. From the APM tool we could observe CPU, memory utilization to be perfect. On the other hand, from the APM tool we could observe that traffic wasn’t coming into this particular application instance. It was really puzzling. Why traffic wasn’t coming in? We logged in to this problematic AWS EC2 instance. We executed vmstat, iostat, netstat, top, df commands to see whether we can uncover any anomaly. To our surprise, all these great tools didn’t report any issue. As the next step, we restarted the Tomcat application server in which this application was running. It didn’t make any difference either. Still, this application instance wasn’t responding at all. DMESG Command Then we issued ‘dmesg’ command on this EC2 instance. This command prints the message buffer of the kernel. The output of this command typically contains the messages produced by the device drivers. In the output generated by this command, we noticed the following interesting messages to be printed repeatedly: [4486500.513856] TCP: out of memory -- consider tuning tcp_mem [4487211.020449] TCP: out of memory -- consider tuning tcp_mem [4487369.441522] TCP: out of memory -- consider tuning tcp_mem [4487535.908607] TCP: out of memory -- consider tuning tcp_mem [4487639.802123] TCP: out of memory -- consider tuning tcp_mem [4487717.564383] TCP: out of memory -- consider tuning tcp_mem [4487784.382403] TCP: out of memory -- consider tuning tcp_mem [4487816.378638] TCP: out of memory -- consider tuning tcp_mem [4487855.352405] TCP: out of memory -- consider tuning tcp_mem [4487862.816227] TCP: out of memory -- consider tuning tcp_mem [4487928.859785] TCP: out of memory -- consider tuning tcp_mem [4488215.969409] TCP: out of memory -- consider tuning tcp_mem [4488642.426484] TCP: out of memory -- consider tuning tcp_mem [4489347.800558] TCP: out of memory -- consider tuning tcp_mem [4490054.414047] TCP: out of memory -- consider tuning tcp_mem [4490763.997344] TCP: out of memory -- consider tuning tcp_mem [4491474.743039] TCP: out of memory -- consider tuning tcp_mem [4491859.749745] TCP: out of memory -- consider tuning tcp_mem [4492182.082423] TCP: out of memory -- consider tuning tcp_mem [4496318.377316] TCP: out of memory -- consider tuning tcp_mem [4505666.858267] TCP: out of memory -- consider tuning tcp_mem [4521592.915616] TCP: out of memory -- consider tuning tcp_mem We were intrigued to see this error message: “TCP: out of memory — consider tuning tcp_mem”. It means out of memory error is happening at TCP level. We had always taught out of memory error happens only at the application level and never at the TCP level. Problem was intriguing because we breathe this OutOfMemoryError problem day in and out. We have built troubleshooting tools like GCeasy, HeapHero to facilitate engineers to debug OutOfMemoryError that happens at the application level (Java, Android, Scala, Jython applications). We have written several blogs on this OutOfMemoryError topic. But we were stumped to see OutOfMemory happening at the device driver level. We never thought there would be a problem at the device driver level, that too in, stable Linux operating system. Being stumped by this problem, we weren’t sure how to proceed further. Thus, we resorted to Google god’s help . Googling for the search term: “TCP: out of memory — consider tuning tcp_mem”, showed only 12 search results. For one article, none of them had much content. Even that one article was written in a foreign language that we couldn’t understand. So, we aren’t sure how to troubleshoot this problem. Now left with no other solutions, we went ahead and implemented a universal solution i.e. “restart”. We restarted the EC2 instance to a put-off immediate burning fire. Hurray! Restarting the server cleared the problem immediately. Apparently, this server wasn’t restarted for several days (like more than 70+ days), may be due to that application might have saturated TCP memory limits. We reached out to one of our intelligent friends who works for a world-class technology company for help. This friend asked us the values that we are setting for the below kernel properties: core.netdev_max_backlog.core.rmem_max.core.wmem_max.ipv4.tcp_max_syn_backlog.ipv4.tcp_rmem.ipv4.tcp_wmem. Honestly, this is the first time, we are hearing about these properties. We found that below are the values set for these properties in the server: net.core.netdev_max_backlog = 1000 net.core.rmem_max = 212992 net.core.wmem_max = 212992 net.ipv4.tcp_max_syn_backlog = 256 net.ipv4.tcp_rmem = 4096 87380 6291456 net.ipv4.tcp_wmem = 4096 20480 4194304 Our friend suggested to change values as given below: net.core.netdev_max_backlog=30000 net.core.rmem_max=134217728 net.core.wmem_max=134217728 net.ipv4.tcp_max_syn_backlog=8192 net.ipv4.tcp_rmem=4096 87380 67108864 net.ipv4.tcp_wmem=4096 87380 67108864 He mentioned setting these values will eliminate the problem we had faced. Sharing the values with you (as it may be of help to you). Apparently, our values have been very low when compared to the values he has provided. Conclusion Here are a few conclusions that we would like to draw: Even the modern industry-standard APM (Application Performance Monitoring) tools aren’t completely answering the application performance problems that we are facing today.‘Dmesg’ command is your friend. You might want to execute this command when your application becomes unresponsive, it may point you out valuable information.Memory problems don’t have to happen in the code that we write, it can happen even at the TCP/Kernel level. Further Reading What Causes OutOfMemoryError? 14 Best Performance Testing Tools and APM Solutions",
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<p>Recently we experienced an interesting production problem. This application was running on multiple AWS EC2 instances behind Elastic Load Balancer. The application was running on a GNU/Linux OS, Java 8, Tomcat 8 application server. All of a sudden, one of the application instances became unresponsive. All other application instances were handling the traffic properly. Whenever the HTTP request was sent to this application instance from the browser, we were getting the following response to be printed on the browser.</p>
|
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<pre><code lang="text/x-java">Proxy Error
|
||
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||
The proxy server received an invalid response from an upstream server.
|
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The proxy server could not handle the request GET /.
|
||
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Reason: Error reading from remote server</code></pre>
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<p><br></p>
|
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<p>We used our APM (Application Performance Monitoring) tool to examine the problem. From the APM tool we could observe CPU, memory utilization to be perfect. On the other hand, from the APM tool we could observe that traffic wasn’t coming into this particular application instance. It was really puzzling. Why traffic wasn’t coming in?</p>
|
||
<p>We logged in to this problematic AWS EC2 instance. We executed <strong>vmstat, iostat, netstat, top, df</strong> commands to see whether we can uncover any anomaly. To our surprise, all these great tools didn’t report any issue.</p>
|
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<p>As the next step, we restarted the Tomcat application server in which this application was running. It didn’t make any difference either. Still, this application instance wasn’t responding at all.</p>
|
||
<h2>DMESG Command</h2>
|
||
<p>Then we issued <strong>‘dmesg’</strong> command on this EC2 instance. This command prints the message buffer of the kernel. The output of this command typically contains the messages produced by the device drivers. In the output generated by this command, we noticed the following interesting messages to be printed repeatedly:</p>
|
||
<pre><code lang="text/x-java">[4486500.513856] TCP: out of memory -- consider tuning tcp_mem
|
||
[4487211.020449] TCP: out of memory -- consider tuning tcp_mem
|
||
[4487369.441522] TCP: out of memory -- consider tuning tcp_mem
|
||
[4487535.908607] TCP: out of memory -- consider tuning tcp_mem
|
||
[4487639.802123] TCP: out of memory -- consider tuning tcp_mem
|
||
[4487717.564383] TCP: out of memory -- consider tuning tcp_mem
|
||
[4487784.382403] TCP: out of memory -- consider tuning tcp_mem
|
||
[4487816.378638] TCP: out of memory -- consider tuning tcp_mem
|
||
[4487855.352405] TCP: out of memory -- consider tuning tcp_mem
|
||
[4487862.816227] TCP: out of memory -- consider tuning tcp_mem
|
||
[4487928.859785] TCP: out of memory -- consider tuning tcp_mem
|
||
[4488215.969409] TCP: out of memory -- consider tuning tcp_mem
|
||
[4488642.426484] TCP: out of memory -- consider tuning tcp_mem
|
||
[4489347.800558] TCP: out of memory -- consider tuning tcp_mem
|
||
[4490054.414047] TCP: out of memory -- consider tuning tcp_mem
|
||
[4490763.997344] TCP: out of memory -- consider tuning tcp_mem
|
||
[4491474.743039] TCP: out of memory -- consider tuning tcp_mem
|
||
[4491859.749745] TCP: out of memory -- consider tuning tcp_mem
|
||
[4492182.082423] TCP: out of memory -- consider tuning tcp_mem
|
||
[4496318.377316] TCP: out of memory -- consider tuning tcp_mem
|
||
[4505666.858267] TCP: out of memory -- consider tuning tcp_mem
|
||
[4521592.915616] TCP: out of memory -- consider tuning tcp_mem</code></pre>
|
||
<p><br></p>
|
||
<p>We were intrigued to see this error message: “TCP: out of memory — consider tuning tcp_mem”. It means out of memory error is happening at TCP level. We had always taught out of memory error happens only at the application level and never at the TCP level.</p>
|
||
<p>Problem was intriguing because we breathe this OutOfMemoryError problem day in and out. We have built troubleshooting tools like <a href="https://gceasy.io/" target="_blank">GCeasy</a>, <a href="https://heaphero.io/" target="_blank">HeapHero</a> to facilitate engineers to debug OutOfMemoryError that happens at the application level (Java, Android, Scala, Jython applications). We have written <a href="https://blog.heaphero.io/?s=OutOfMemoryError" target="_blank">several blogs on this OutOfMemoryError</a> topic. But we were stumped to see OutOfMemory happening at the device driver level. We never thought there would be a problem at the device driver level, that too in, stable Linux operating system. Being stumped by this problem, we weren’t sure how to proceed further.</p>
|
||
<p>Thus, we resorted to Google god’s help . Googling for the search term: “TCP: out of memory — consider tuning tcp_mem”, showed only 12 search results. For one article, none of them had much content. Even that one article was written in a foreign language that we couldn’t understand. So, we aren’t sure how to troubleshoot this problem.</p>
|
||
<p>Now left with no other solutions, we went ahead and implemented a universal solution i.e. “restart”. We restarted the EC2 instance to a put-off immediate burning fire. Hurray! Restarting the server cleared the problem immediately. Apparently, this server wasn’t restarted for several days (like more than 70+ days), may be due to that application might have saturated TCP memory limits.</p>
|
||
<p>We reached out to one of our intelligent friends who works for a world-class technology company for help. This friend asked us the values that we are setting for the below kernel properties:</p>
|
||
<ul>
|
||
<li>core.netdev_max_backlog.</li>
|
||
<li>core.rmem_max.</li>
|
||
<li>core.wmem_max.</li>
|
||
<li>ipv4.tcp_max_syn_backlog.</li>
|
||
<li>ipv4.tcp_rmem.</li>
|
||
<li>ipv4.tcp_wmem.</li>
|
||
</ul>
|
||
<p>Honestly, this is the first time, we are hearing about these properties. We found that below are the values set for these properties in the server:</p>
|
||
<pre><code lang="text/x-java">net.core.netdev_max_backlog = 1000
|
||
net.core.rmem_max = 212992
|
||
net.core.wmem_max = 212992
|
||
net.ipv4.tcp_max_syn_backlog = 256
|
||
net.ipv4.tcp_rmem = 4096 87380 6291456
|
||
net.ipv4.tcp_wmem = 4096 20480 4194304</code></pre>
|
||
<p><br></p>
|
||
<p>Our friend suggested to change values as given below:</p>
|
||
<pre><code lang="text/x-java">net.core.netdev_max_backlog=30000
|
||
net.core.rmem_max=134217728
|
||
net.core.wmem_max=134217728
|
||
net.ipv4.tcp_max_syn_backlog=8192
|
||
net.ipv4.tcp_rmem=4096 87380 67108864
|
||
net.ipv4.tcp_wmem=4096 87380 67108864</code></pre>
|
||
<p><br></p>
|
||
<p>He mentioned setting these values will eliminate the problem we had faced. Sharing the values with you (as it may be of help to you). Apparently, our values have been very low when compared to the values he has provided.</p>
|
||
<h2>Conclusion</h2>
|
||
<p>Here are a few conclusions that we would like to draw:</p>
|
||
<ul>
|
||
<li>Even the modern industry-standard APM (Application Performance Monitoring) tools aren’t completely answering the application performance problems that we are facing today.</li>
|
||
<li>‘<strong>Dmesg</strong>’ command is your friend. You might want to execute this command when your application becomes unresponsive, it may point you out valuable information.</li>
|
||
<li>Memory problems don’t have to happen in the code that we write, it can happen even at the TCP/Kernel level.</li>
|
||
</ul>
|
||
<p><br></p>
|
||
<h2>Further Reading</h2>
|
||
<p><a href="https://dzone.com/articles/what-causes-outofmemoryerror">What Causes OutOfMemoryError?</a></p>
|
||
<p><a href="https://dzone.com/articles/14-best-performance-testing-tools-and-apm-solution">14 Best Performance Testing Tools and APM Solutions</a></p></div>
|
||
</div>
|
||
|
||
<div id="bottom-bumper-container"></div>
|
||
<div class="article-tag-pill-container">
|
||
<span class="article-tag-pill">Transmission Control Protocol</span>
|
||
<span class="article-tag-pill">Memory (storage engine)</span>
|
||
<span class="article-tag-pill">application</span>
|
||
</div>
|
||
|
||
<div class="attribution">
|
||
<p>Opinions expressed by DZone contributors are their own.</p>
|
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</div>
|
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|
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</article>
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<h2 id="related-mobile-heading">Related</h2>
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<ul>
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<li class="item">
|
||
<a href="/articles/troubleshooting-memory-leaks-deep-dive-into-common-heap-profilers" class="goto-link related-link">Troubleshooting Memory Leaks With Heap Profilers</a>
|
||
</li>
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<li class="item">
|
||
<a href="/articles/anypoint-runtime-fabric-basic-but-crucial-points-f" class="goto-link related-link">Anypoint Runtime Fabric Basic vs. Crucial Points for Planning Resources</a>
|
||
</li>
|
||
<li class="item">
|
||
<a href="/articles/javaspring-bootmongodb-performance-analysis-and-im" class="goto-link related-link">Java, Spring Boot, and MongoDB: Performance Analysis and Improvements</a>
|
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</li>
|
||
<li class="item">
|
||
<a href="/articles/hardware-optimization-best-practices-for-database" class="goto-link related-link">Hardware Optimization: Best Practices for Database Performance Boost</a>
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>
|
||
<div class="dz-style modal-inner centered relative">
|
||
<button x-show="$store.modal_engagement_error.closeable"
|
||
class="btn-close"
|
||
x-on:click="$store.modal_engagement_error.close()"
|
||
aria-label="Close">
|
||
</button>
|
||
|
||
<div x-show="$store.modal_engagement_error.title" class="modal-header p-sm mt-sm mb-md">
|
||
<div class="title " x-text="$store.modal_engagement_error.title"></div>
|
||
</div>
|
||
|
||
<div class="modal-content py-md px-lg" x-bind:class="{ 'has-top-border': $store.modal_engagement_error.title }">
|
||
<p x-show="$store.modal_engagement_error.bodyText" class="my-none" x-text="$store.modal_engagement_error.bodyText"></p>
|
||
<p>The likes didn't load as expected. Please refresh the page and try again.</p>
|
||
</div>
|
||
|
||
<div x-show="$store.modal_engagement_error.options.length" class="modal-footer p-sm">
|
||
<template x-for="option in $store.modal_engagement_error.options">
|
||
<button x-show="option.canDisplay" x-text="option.text"
|
||
type="button"
|
||
x-bind:id="'button_modal_engagement_error_' + option.index"
|
||
x-bind:class="option.classList"
|
||
x-on:click="option.onClick"
|
||
x-bind:disabled="option.isDisabled"
|
||
></button>
|
||
</template>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
<script>
|
||
document.addEventListener("alpine:init", () => {
|
||
Alpine.store("modal_engagement_error", {
|
||
_open: false,
|
||
title: "Oops! Something Went Wrong",
|
||
bodyText: null,
|
||
options: [{"action":"dismiss","text":"Close"}],
|
||
closeable: true,
|
||
dismissible: true,
|
||
open(data) {
|
||
if (data) {
|
||
if (data.title) {
|
||
this.title = data.title;
|
||
}
|
||
if (data.bodyText) {
|
||
this.bodyText = data.bodyText;
|
||
}
|
||
if (data.options) {
|
||
this.options = data.options;
|
||
}
|
||
if (data.dismissAfterMs) {
|
||
setTimeout(() => this._open = false, data.dismissAfterMs);
|
||
}
|
||
}
|
||
this.updateOptions();
|
||
this._open = true;
|
||
},
|
||
close() {
|
||
// Manually click the buttons in which should run on dismiss.
|
||
// This is to keep the context. Calling this[option.action]() will not work.
|
||
for (let option of this.options) {
|
||
if (option.runOnDismiss) {
|
||
const element = document.querySelector('#button_modal_engagement_error_' + option.index);
|
||
element.click();
|
||
}
|
||
}
|
||
this._open = false;
|
||
},
|
||
updateOptions() {
|
||
const btnStyle = this.options.length === 2 ? ' btn-default' : '';
|
||
this.options = this.options.map((o, idx) => ({
|
||
...o,
|
||
index: idx,
|
||
classList: o.classList ? o.classList : (idx === 0 ? "btn btn-primary hov-brighten" : "btn hov-underline" + btnStyle),
|
||
onClick: function() {
|
||
if (o.action !== "dismiss") {
|
||
this[o.action]();
|
||
}
|
||
this.$store["modal_engagement_error"].close();
|
||
},
|
||
isDisabled: function() {
|
||
return Object.hasOwn(o, 'disabled') && this[o.disabled]();
|
||
},
|
||
canDisplay: function() {
|
||
return !Object.hasOwn(o, 'condition') || this[o.condition]();
|
||
}
|
||
}));
|
||
},
|
||
init() {
|
||
this.updateOptions();
|
||
}
|
||
});
|
||
});
|
||
</script>
|
||
|
||
<link rel="stylesheet" media="all" href="https://dz2cdn1.dzone.com/themes/dz20/ftl/footer/styles.css">
|
||
|
||
<div id="ftl-footer">
|
||
<div class="container-fluid footerOuter" style="padding-bottom: 90px;">
|
||
<div class="row">
|
||
<div class="col-md-12">
|
||
<div class="container">
|
||
<div class="row footer">
|
||
<div class="col-md-12 footerWidget">
|
||
<div class="row footerContainer footer">
|
||
<div class="left col-xs-12 col-sm-7">
|
||
<div class="col-xs-12 social-media-icons footer-mobile">
|
||
<ul class="icons-only">
|
||
<li class="rss-icon" id="rss-footer-1">
|
||
<a href="/pages/feeds" target="_blank" rel="noreferrer noopener">
|
||
<svg role="img" viewBox="0 0 24 24" class="w-4 h-4 mt-1.75 fill-current" aria-label="Follow our RSS feeds">
|
||
<title>RSS</title>
|
||
<path d="M19.199 24C19.199 13.467 10.533 4.8 0 4.8V0c13.165 0 24 10.835 24 24h-4.801zM3.291 17.415c1.814 0 3.293 1.479 3.293 3.295 0 1.813-1.485 3.29-3.301 3.29C1.47 24 0 22.526 0 20.71s1.475-3.294 3.291-3.295zM15.909 24h-4.665c0-6.169-5.075-11.245-11.244-11.245V8.09c8.727 0 15.909 7.184 15.909 15.91z"></path>
|
||
</svg>
|
||
</a>
|
||
</li>
|
||
<li class="twitter-icon">
|
||
<a href="https://twitter.com/DZoneInc" target="_blank" rel="noreferrer noopener">
|
||
<svg role="img" viewBox="0 0 24 24" aria-label="Follow us on X">
|
||
<title>X</title>
|
||
<path d="M14.234 10.162 22.977 0h-2.072l-7.591 8.824L7.251 0H.258l9.168 13.343L.258 24H2.33l8.016-9.318L16.749 24h6.993zm-2.837 3.299-.929-1.329L3.076 1.56h3.182l5.965 8.532.929 1.329 7.754 11.09h-3.182z"></path>
|
||
</svg>
|
||
</a>
|
||
</li>
|
||
<li class="facebook-icon">
|
||
<a href="https://www.facebook.com/DZoneInc" target="_blank" rel="noreferrer noopener">
|
||
<svg role="img" viewBox="0 0 24 24" aria-label="Follow us on Facebook">
|
||
<title>Facebook</title>
|
||
<path d="M9.101 23.691v-7.98H6.627v-3.667h2.474v-1.58c0-4.085 1.848-5.978 5.858-5.978.401 0 .955.042 1.468.103a8.68 8.68 0 0 1 1.141.195v3.325a8.623 8.623 0 0 0-.653-.036 26.805 26.805 0 0 0-.733-.009c-.707 0-1.259.096-1.675.309a1.686 1.686 0 0 0-.679.622c-.258.42-.374.995-.374 1.752v1.297h3.919l-.386 2.103-.287 1.564h-3.246v8.245C19.396 23.238 24 18.179 24 12.044c0-6.627-5.373-12-12-12s-12 5.373-12 12c0 5.628 3.874 10.35 9.101 11.647Z"></path>
|
||
</svg>
|
||
</a>
|
||
</li>
|
||
<li class="linkedin-icon">
|
||
<a href="https://www.linkedin.com/company/dzone/" target="_blank"
|
||
rel="noreferrer noopener">
|
||
<svg viewBox="0 0 24 25" fill="none" aria-label="Follow us on LinkedIn">
|
||
<path d="M6.20062 21.2143H1.84688V7.194H6.20062V21.2143ZM4.02141 5.2815C2.62922 5.2815 1.5 4.12838 1.5 2.73619C1.5 2.06747 1.76565 1.42614 2.2385 0.953285C2.71136 0.48043 3.35269 0.214783 4.02141 0.214783C4.69012 0.214783 5.33145 0.48043 5.80431 0.953285C6.27716 1.42614 6.54281 2.06747 6.54281 2.73619C6.54281 4.12838 5.413 5.2815 4.02141 5.2815ZM22.4953 21.2143H18.1509V14.3893C18.1509 12.7628 18.1181 10.6768 15.8873 10.6768C13.6237 10.6768 13.2769 12.444 13.2769 14.2721V21.2143H8.92781V7.194H13.1034V9.1065H13.1644C13.7456 8.00494 15.1655 6.84244 17.2838 6.84244C21.69 6.84244 22.5 9.744 22.5 13.5128V21.2143H22.4953Z" fill="currentColor"></path>
|
||
</svg>
|
||
</a>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
|
||
<div class="top-section col-xs-12">
|
||
<div class="col-xs-12 col-sm-6">
|
||
<p class="section-header">ABOUT US</p>
|
||
<ul class="link-group">
|
||
<li><a href="/pages/about" rel="noreferrer noopener">About DZone</a></li>
|
||
<li><a href="/cdn-cgi/l/email-protection#40333530302f323400243a2f2e256e232f2d" rel="noreferrer noopener">Support and feedback</a></li>
|
||
<li><a href="/pages/dzone-community-research">Community research</a></li>
|
||
</ul>
|
||
</div>
|
||
<div class="col-xs-12 col-sm-6">
|
||
<p class="section-header">ADVERTISE</p>
|
||
<ul class="link-group">
|
||
<li><a href="https://advertise.dzone.com" target="_blank" rel="noreferrer noopener">Advertise with DZone</a></li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
|
||
<div class="bottom-section col-xs-12">
|
||
<div class="col-xs-12 col-sm-6">
|
||
<p class="section-header">CONTRIBUTE ON DZONE</p>
|
||
<ul class="bottom-top-list link-group">
|
||
<li><a href="/articles/dzones-article-submission-guidelines">Article Submission Guidelines</a></li>
|
||
<li><a href="/pages/contribute" rel="noreferrer noopener">Become a Contributor</a></li>
|
||
<li><a href="/pages/core" rel="noreferrer noopener">Core Program</a></li>
|
||
<li><a href="/writers-zone" rel="noreferrer noopener">Visit the Writers' Zone</a></li>
|
||
</ul>
|
||
|
||
<p class="section-header">LEGAL</p>
|
||
<ul class="link-group">
|
||
<li><a href="https://technologyadvice.com/terms-conditions/" target="_blank" rel="noreferrer noopener">Terms of Service</a></li>
|
||
<li><a href="https://technologyadvice.com/privacy-policy/" target="_blank" rel="noreferrer noopener">Privacy Policy</a></li>
|
||
</ul>
|
||
</div>
|
||
<div class="col-xs-12 col-sm-6">
|
||
<p class="section-header">CONTACT US</p>
|
||
<ul class="link-group">
|
||
<li>3343 Perimeter Hill Drive</li>
|
||
<li>Suite 215</li>
|
||
<li>Nashville, TN 37211</li>
|
||
<li><a href="/cdn-cgi/l/email-protection#4c3f393c3c233e380c2836232229622f2321" rel="noreferrer noopener"><span class="__cf_email__" data-cfemail="95e6e0e5e5fae7e1d5f1effafbf0bbf6faf8">[email protected]</span></a></li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
<div class="right col-xs-12 col-sm-5">
|
||
|
||
<p class="connect-text">Let's be friends:</p>
|
||
<div class="col-xs-12 social-media-icons footer-wide">
|
||
<ul class="icons-only">
|
||
<li class="rss-icon" id="rss-footer-1">
|
||
<a href="/pages/feeds" target="_blank" rel="noreferrer noopener">
|
||
<svg role="img" viewBox="0 0 24 24" aria-label="Follow our RSS feeds">
|
||
<title>RSS</title>
|
||
<path d="M19.199 24C19.199 13.467 10.533 4.8 0 4.8V0c13.165 0 24 10.835 24 24h-4.801zM3.291 17.415c1.814 0 3.293 1.479 3.293 3.295 0 1.813-1.485 3.29-3.301 3.29C1.47 24 0 22.526 0 20.71s1.475-3.294 3.291-3.295zM15.909 24h-4.665c0-6.169-5.075-11.245-11.244-11.245V8.09c8.727 0 15.909 7.184 15.909 15.91z"></path>
|
||
</svg>
|
||
</a>
|
||
</li>
|
||
<li class="twitter-icon">
|
||
<a href="https://twitter.com/DZoneInc" target="_blank" rel="noreferrer noopener">
|
||
<svg role="img" viewBox="0 0 24 24" aria-label="Follow us on X">
|
||
<title>X</title>
|
||
<path d="M14.234 10.162 22.977 0h-2.072l-7.591 8.824L7.251 0H.258l9.168 13.343L.258 24H2.33l8.016-9.318L16.749 24h6.993zm-2.837 3.299-.929-1.329L3.076 1.56h3.182l5.965 8.532.929 1.329 7.754 11.09h-3.182z"></path>
|
||
</svg>
|
||
</a>
|
||
</li>
|
||
<li class="facebook-icon">
|
||
<a href="https://www.facebook.com/DZoneInc" target="_blank" rel="noreferrer noopener">
|
||
<svg role="img" viewBox="0 0 24 24" aria-label="Follow us on Facebook">
|
||
<title>Facebook</title>
|
||
<path d="M9.101 23.691v-7.98H6.627v-3.667h2.474v-1.58c0-4.085 1.848-5.978 5.858-5.978.401 0 .955.042 1.468.103a8.68 8.68 0 0 1 1.141.195v3.325a8.623 8.623 0 0 0-.653-.036 26.805 26.805 0 0 0-.733-.009c-.707 0-1.259.096-1.675.309a1.686 1.686 0 0 0-.679.622c-.258.42-.374.995-.374 1.752v1.297h3.919l-.386 2.103-.287 1.564h-3.246v8.245C19.396 23.238 24 18.179 24 12.044c0-6.627-5.373-12-12-12s-12 5.373-12 12c0 5.628 3.874 10.35 9.101 11.647Z"></path>
|
||
</svg>
|
||
</a>
|
||
</li>
|
||
<li class="linkedin-icon">
|
||
<a href="https://www.linkedin.com/company/dzone/" target="_blank"
|
||
rel="noreferrer noopener">
|
||
<svg viewBox="0 0 24 25" fill="none" aria-label="Follow us on LinkedIn">
|
||
<path d="M6.20062 21.2143H1.84688V7.194H6.20062V21.2143ZM4.02141 5.2815C2.62922 5.2815 1.5 4.12838 1.5 2.73619C1.5 2.06747 1.76565 1.42614 2.2385 0.953285C2.71136 0.48043 3.35269 0.214783 4.02141 0.214783C4.69012 0.214783 5.33145 0.48043 5.80431 0.953285C6.27716 1.42614 6.54281 2.06747 6.54281 2.73619C6.54281 4.12838 5.413 5.2815 4.02141 5.2815ZM22.4953 21.2143H18.1509V14.3893C18.1509 12.7628 18.1181 10.6768 15.8873 10.6768C13.6237 10.6768 13.2769 12.444 13.2769 14.2721V21.2143H8.92781V7.194H13.1034V9.1065H13.1644C13.7456 8.00494 15.1655 6.84244 17.2838 6.84244C21.69 6.84244 22.5 9.744 22.5 13.5128V21.2143H22.4953Z" fill="currentColor"></path>
|
||
</svg>
|
||
</a>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<script data-cfasync="false" src="/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js"></script><script>
|
||
const articleId = 2870020;
|
||
const likes = 9;
|
||
const assetDomain = 'https://dz2cdn1.dzone.com';
|
||
const codemirrorVars = {
|
||
modeURI: 'https://dz2cdn1.dzone.com/themes/dz20/lib/codemirror/mode/',
|
||
requiredScripts: [
|
||
'https://dz2cdn1.dzone.com/themes/dz20/lib/codemirror/lib/codemirror.js',
|
||
'https://dz2cdn1.dzone.com/themes/dz20/lib/codemirror/addon/mode/overlay.js',
|
||
'https://dz2cdn1.dzone.com/themes/dz20/lib/codemirror/addon/mode/multiplex.js',
|
||
'https://dz2cdn1.dzone.com/themes/dz20/lib/codemirror/mode/meta.js'
|
||
]
|
||
};
|
||
|
||
const gptTags = {
|
||
'zone': 'Performance',
|
||
'topicTag': 'Transmission Control Protocol,memory,application',
|
||
'company': '',
|
||
'siteSection': 'Zones',
|
||
'articleCategory': 'analysis',
|
||
'nodeID': '2870020',
|
||
'authorID': '2756952',
|
||
'publishYear': '2019',
|
||
'publishMonth': '09',
|
||
'jobRole': '',
|
||
'companySize': '',
|
||
'env': 'prod'
|
||
};
|
||
|
||
const minCommentChar = 10;
|
||
</script>
|
||
<script async>const width = window.innerWidth;
|
||
|
||
const metadata = {
|
||
'top': {
|
||
'position': 'top',
|
||
'slot': 'dz2_article_billboard_new',
|
||
},
|
||
'sponsorLogo': {
|
||
'position': 'zoneHomepage',
|
||
'slot': 'dz2_homepage_sponsor_logo',
|
||
'refreshable': false
|
||
},
|
||
'sidebar1': {
|
||
'position': 'sidebar',
|
||
'slot': 'dz2_article_halfpage_new',
|
||
'minWidthToShow': 1024
|
||
},
|
||
'topBumper': {
|
||
'position': 'top',
|
||
'slot': 'dz2_bumper_text_ad',
|
||
'minWidthToShow': 1024
|
||
},
|
||
'bottomBumper': {
|
||
'position': 'bottom',
|
||
'slot': 'dz2_bumper_text_ad',
|
||
'minWidthToShow': 1024
|
||
},
|
||
'bottom': {
|
||
'position': 'bottom',
|
||
'slot': 'dz2_article_bottom',
|
||
},
|
||
'bottomStickyFooter': {
|
||
'position': 'sticky',
|
||
'slot': 'dz2_sticky_footer_leaderboard',
|
||
},
|
||
'partner': {
|
||
'slot': 'dz2_partner_resource_link',
|
||
},
|
||
'branded': {
|
||
'slot': 'dz2_branded_content',
|
||
'refreshable': false
|
||
},
|
||
'topicBillboard': {
|
||
'position': ['top', 'zoneHomepage'],
|
||
'slot': 'dz2_topic_billboard',
|
||
},
|
||
'listPageSidebar': {
|
||
'position': 'sidebar',
|
||
'slot': 'dz2_list_page_sidebar',
|
||
'minWidthToShow': 1024
|
||
},
|
||
'topListPageLeaderboard2': {
|
||
'position': ['top', 'zoneList'],
|
||
'slot': 'dz2_list_page_leaderboard_2',
|
||
},
|
||
'bottomListPageLeaderboard2': {
|
||
'position': ['bottom', 'zoneList'],
|
||
'slot': 'dz2_list_page_leaderboard_2',
|
||
},
|
||
'homepageLeaderboard': {
|
||
'position': 'top',
|
||
'slot': 'dz2_homepage_leaderboard',
|
||
},
|
||
'homepageLeaderboard2': {
|
||
'position': 'bottom',
|
||
'slot': 'dz2_homepage_leaderboard_2',
|
||
},
|
||
'skybox': {
|
||
'position': 'above nav',
|
||
'slot': 'dz_skybox',
|
||
'refreshable': false
|
||
},
|
||
'inline': {
|
||
'position': 'inline',
|
||
'slot': 'dz2_inline-article-display',
|
||
}
|
||
};
|
||
|
||
var campaign = new URLSearchParams(window.location.search).get("adTargeting_campaign");
|
||
|
||
window.googletag = window.googletag || { cmd: [] };
|
||
|
||
if (campaign) {
|
||
window.googletag.cmd.push(function() {
|
||
window.googletag.setConfig({ targeting: { campaign }});
|
||
});
|
||
}
|
||
|
||
let lastHeader = null;
|
||
|
||
const topContainer = document.querySelector('#top-bumper-container');
|
||
const bottomContainer = document.querySelector('#bottom-bumper-container');
|
||
|
||
function GAM_getPersistentValue(key) {
|
||
const stored = JSON.parse(localStorage.getItem(key));
|
||
|
||
if (!stored) {
|
||
return null;
|
||
}
|
||
|
||
const { value, expiration } = stored;
|
||
|
||
if (expiration && Date.now() >= expiration) {
|
||
localStorage.removeItem(key);
|
||
return null;
|
||
}
|
||
|
||
return value;
|
||
}
|
||
|
||
function GAM_setPersistentValue(key, value, expiration) {
|
||
// 5 minutes from now
|
||
if (!expiration) {
|
||
expiration = Date.now() + 300000;
|
||
}
|
||
|
||
const storedValue = JSON.stringify({
|
||
value: value,
|
||
expiration: expiration
|
||
});
|
||
|
||
localStorage.setItem(key, storedValue);
|
||
|
||
return value;
|
||
}
|
||
|
||
function GAM_synchronousRequest(params) {
|
||
const xhr = new XMLHttpRequest();
|
||
xhr.open('GET', params.url, false);
|
||
xhr.setRequestHeader("Content-Type", "application/json");
|
||
|
||
if (typeof params.auth_header !== "undefined") {
|
||
xhr.setRequestHeader("Authorization", params.auth_header);
|
||
}
|
||
|
||
xhr.send(null);
|
||
if (xhr.status === 200) {
|
||
return xhr.responseText;
|
||
} else {
|
||
throw new Error('Request failed: ' + xhr.statusText);
|
||
}
|
||
}
|
||
|
||
function GAM_fetch_data(params) {
|
||
let stored_data = GAM_getPersistentValue(params.storage_key);
|
||
|
||
if (stored_data === null) {
|
||
try {
|
||
const response = GAM_synchronousRequest(params);
|
||
const data = JSON.parse(response);
|
||
|
||
// Store and expire after 30 minutes
|
||
return GAM_setPersistentValue(params.storage_key, data, Date.now() + 1800000);
|
||
} catch (error) {
|
||
console.error('Could not get ' + params.storage_key + ' data: ' + error);
|
||
return null;
|
||
}
|
||
} else {
|
||
return stored_data;
|
||
}
|
||
}
|
||
|
||
function GAM_setUpSixSenseTargeting() {
|
||
let meData = GAM_fetch_data({
|
||
url: "https://link.technologyadvice.com/_me",
|
||
storage_key: "ta_me_data"
|
||
});
|
||
let sixSenseData = GAM_fetch_data({
|
||
url: "https://epsilon.6sense.com/v3/company/details",
|
||
auth_header: "Token d20a1b0e892442270cbc4cb6801c0160d28af04c",
|
||
storage_key: "ta_6s_data"
|
||
});
|
||
|
||
function meDataIncludes(i) {
|
||
return meData.tags.includes(i);
|
||
}
|
||
|
||
if (typeof meData !== "undefined" && meData !== null) {
|
||
window.googletag.pubads().setTargeting("visitor_id", meData.vid);
|
||
window.googletag.pubads().setTargeting("user_agent", meData.user_agent);
|
||
|
||
var tags_mapping = {
|
||
"is_datacenter": ["site.is-datacenter"],
|
||
"is_suspected_bot": ["site.suspected-bad-bot", "site.bad-bot"],
|
||
"is_ta_user": ["site.is-ta-user"],
|
||
"is_crawler": ["site.user-agent-blocked"],
|
||
"is_ad_blocked": ["site.is-ad-blocked"],
|
||
};
|
||
|
||
for (var key in tags_mapping) {
|
||
if (tags_mapping[key].some(meDataIncludes)) {
|
||
window.googletag.pubads().setTargeting(key, 'true');
|
||
}
|
||
}
|
||
}
|
||
|
||
if (typeof sixSenseData !== "undefined" && sixSenseData !== null) {
|
||
var segment_ids = [];
|
||
if (sixSenseData.segments && sixSenseData.segments.ids && sixSenseData.segments.ids.length) {
|
||
sixSenseData.segments.ids.forEach(function (v) {
|
||
segment_ids.push(v.toString());
|
||
});
|
||
}
|
||
if (typeof segment_ids !== "undefined" && segment_ids.length > 0) {
|
||
window.googletag.pubads().setTargeting("segment_ids_6si", segment_ids);
|
||
}
|
||
}
|
||
}
|
||
|
||
if (width >= 1024 && (topContainer || bottomContainer)) {
|
||
// Dynamically create bumper ad slots for non-mobile devices.
|
||
// Prevents ugly dividers being rendered on empty ad slots (mobile)
|
||
const topBumper = document.createElement('div');
|
||
topBumper.id = 'div-gpt-ad-1435246566686-3';
|
||
topBumper.classList.add('article-bumper', 'article-bumper-top', 'dz2_bumper_text_ad');
|
||
topBumper.setAttribute('data-gpt-slot', 'topBumper');
|
||
|
||
topContainer.appendChild(topBumper);
|
||
|
||
const bottomBumper = document.createElement('div');
|
||
bottomBumper.id = 'div-gpt-ad-1435246566686-4';
|
||
bottomBumper.classList.add('article-bumper', 'article-bumper-bottom', 'dz2_bumper_text_ad');
|
||
bottomBumper.setAttribute('data-gpt-slot', 'bottomBumper');
|
||
|
||
bottomContainer.appendChild(bottomBumper);
|
||
}
|
||
|
||
if (gptTags.zone) {
|
||
gptTags.zone = gptTags.zone.replaceAll(/[\s/]/g, '_')
|
||
.replaceAll(/[^a-zA-Z0-9_]/g, '')
|
||
.toLowerCase();
|
||
}
|
||
|
||
makeAds();
|
||
|
||
function handleSkybox() {
|
||
const skybox = document.querySelector('div.skybox');
|
||
if (skybox) {
|
||
document.body.classList.add('skybox-auto-collapse');
|
||
// observe classlist changes for offsetting sticky ads
|
||
const observer = new MutationObserver((mutations) => {
|
||
mutations.forEach((mutation) => {
|
||
if (mutation.type === 'attributes' && mutation.attributeName === 'class') {
|
||
let offset = 0;
|
||
if (!document.body.classList.contains('skybox-closed') && (
|
||
document.body.classList.contains('ccad-skybox-manualcollapse')
|
||
|| document.body.classList.contains('ccad-skybox-manualexpand')
|
||
)) {
|
||
offset = skybox.getBoundingClientRect().height;
|
||
}
|
||
let eligibleAds = [
|
||
{ element: document.querySelector('.content-right-images'), offset: 108 },
|
||
{ element: document.querySelector('.trending-sidebar'), offset: 88 },
|
||
{ element: document.querySelector('.trending'), offset: 88 }
|
||
];
|
||
for (let ad of eligibleAds) {
|
||
if (ad.element) {
|
||
ad.element.style.top = (ad.offset + offset) + 'px';
|
||
}
|
||
}
|
||
}
|
||
});
|
||
});
|
||
observer.observe(document.body, { attributes: true });
|
||
}
|
||
}
|
||
|
||
function isHeaderEligible(header) {
|
||
const range = document.createRange();
|
||
range.setStartAfter(lastHeader);
|
||
range.setEndBefore(header);
|
||
|
||
return range.toString().trim().length >= 600;
|
||
}
|
||
|
||
function placeInlineAds() {
|
||
const excludedContent = document.querySelectorAll('#ftl-article.branded-content, #ftl-article.sponsored');
|
||
|
||
if (excludedContent.length > 0) {
|
||
return;
|
||
}
|
||
|
||
const headers = Array.from(document.querySelectorAll('.content-html h2')).splice(1);
|
||
|
||
let globalIndex = 12;
|
||
|
||
for (let i = 0; i < headers.length; i++) {
|
||
if (!lastHeader || isHeaderEligible(headers[i])) {
|
||
const element = document.createElement('div');
|
||
element.id = 'div-gpt-ad-1435246566686-' + globalIndex;
|
||
element.classList.add('inline-display', 'dz2_inline-article-display');
|
||
element.setAttribute('data-gpt-slot', 'inline');
|
||
headers[i].before(element);
|
||
lastHeader = element;
|
||
globalIndex++;
|
||
}
|
||
}
|
||
}
|
||
|
||
function makeAds() {
|
||
handleSkybox();
|
||
placeInlineAds();
|
||
|
||
const script = document.createElement('script');
|
||
script.src = 'https://i6ByW9Zmz4ncxhHkb.ay.delivery/manager/i6ByW9Zmz4ncxhHkb';
|
||
script.type = 'text/javascript';
|
||
script.referrerPolicy = 'no-referrer-when-downgrade';
|
||
|
||
document.head.appendChild(script);
|
||
|
||
window.googletag.cmd.push(function() {
|
||
const containers = document.querySelectorAll('div[data-gpt-slot]');
|
||
|
||
for (let container of containers) {
|
||
const div = container.getAttribute('data-gpt-slot');
|
||
const meta = metadata[div];
|
||
|
||
if (meta.minWidthToShow && width < meta.minWidthToShow) {
|
||
continue;
|
||
}
|
||
|
||
window.googletag.pubads().setTargeting('hostname', window.location.hostname);
|
||
|
||
Object.keys(gptTags).forEach(function(key) {
|
||
window.googletag.pubads().setTargeting(key, gptTags[key]);
|
||
});
|
||
|
||
window.googletag.pubads().addEventListener('slotRenderEnded', (event) => {
|
||
window.requestAnimationFrame(() => {
|
||
var slotId = event.slot.getSlotElementId();
|
||
|
||
if (!slotId.includes('__ayManagerEnv__')) {
|
||
return;
|
||
}
|
||
|
||
var className = slotId.split('__ayManagerEnv__')[0];
|
||
var slotName = className.replace('dz2_', '').replace('dz_', '').replace(/_\d+$/, '');
|
||
var unitName = meta.slot.replace('dz2_', '').replace('dz_', '').replace(/_\d+$/, '');
|
||
|
||
if (slotName !== unitName) {
|
||
return;
|
||
}
|
||
|
||
var elem = document.getElementById(slotId);
|
||
|
||
if (!elem) {
|
||
console.warn('Ad element missing', slotId);
|
||
return;
|
||
}
|
||
|
||
// Ad unit did not fill, collapse slot
|
||
if (event.isEmpty && elem.parentElement) {
|
||
elem.parentElement.style.display = 'none';
|
||
}
|
||
});
|
||
});
|
||
}
|
||
|
||
GAM_setUpSixSenseTargeting();
|
||
});
|
||
}
|
||
</script>
|
||
<script async>// InMobi Choice. Consent Manager Tag v3.0 (for TCF 2.2)
|
||
!function(){var e=window.location.hostname,t=document.createElement("script"),n=document.getElementsByTagName("script")[0],a="https://cmp.inmobi.com".concat("/choice/","vPn77x7pBG57Y","/","dzone.com","/choice.js?tag_version=V3"),p=0;t.async=!0,t.type="text/javascript",t.src=a,n.parentNode.insertBefore(t,n),function(){for(var e,t="__tcfapiLocator",n=[],a=window;a;){try{if(a.frames[t]){e=a;break}}catch(e){}if(a===window.top)break;a=a.parent}e||(!function e(){var n=a.document,p=!!a.frames[t];if(!p)if(n.body){var s=n.createElement("iframe");s.style.cssText="display:none",s.name=t,n.body.appendChild(s)}else setTimeout(e,5);return!p}(),a.__tcfapi=function(){var e,t=arguments;if(!t.length)return n;if("setGdprApplies"===t[0])t.length>3&&2===t[2]&&"boolean"==typeof t[3]&&(e=t[3],"function"==typeof t[2]&&t[2]("set",!0));else if("ping"===t[0]){var a={gdprApplies:e,cmpLoaded:!1,cmpStatus:"stub"};"function"==typeof t[2]&&t[2](a)}else"init"===t[0]&&"object"==typeof t[3]&&(t[3]=Object.assign(t[3],{tag_version:"V3"})),n.push(t)},a.addEventListener("message",(function(e){var t="string"==typeof e.data,n={};try{n=t?JSON.parse(e.data):e.data}catch(e){}var a=n.__tcfapiCall;a&&window.__tcfapi(a.command,a.version,(function(n,p){var s={__tcfapiReturn:{returnValue:n,success:p,callId:a.callId}};t&&(s=JSON.stringify(s)),e&&e.source&&e.source.postMessage&&e.source.postMessage(s,"*")}),a.parameter)}),!1))}(),function(){const e=["2:tcfeuv2","6:uspv1","7:usnatv1","8:usca","9:usvav1","10:uscov1","11:usutv1","12:usctv1"];window.__gpp_addFrame=function(e){if(!window.frames[e])if(document.body){var t=document.createElement("iframe");t.style.cssText="display:none",t.name=e,document.body.appendChild(t)}else window.setTimeout(window.__gpp_addFrame,10,e)},window.__gpp_stub=function(){var t=arguments;if(__gpp.queue=__gpp.queue||[],__gpp.events=__gpp.events||[],!t.length||1==t.length&&"queue"==t[0])return __gpp.queue;if(1==t.length&&"events"==t[0])return __gpp.events;var n=t[0],a=t.length>1?t[1]:null,p=t.length>2?t[2]:null;if("ping"===n)a({gppVersion:"1.1",cmpStatus:"stub",cmpDisplayStatus:"hidden",signalStatus:"not ready",supportedAPIs:e,cmpId:10,sectionList:[],applicableSections:[-1],gppString:"",parsedSections:{}},!0);else if("addEventListener"===n){"lastId"in __gpp||(__gpp.lastId=0),__gpp.lastId++;var s=__gpp.lastId;__gpp.events.push({id:s,callback:a,parameter:p}),a({eventName:"listenerRegistered",listenerId:s,data:!0,pingData:{gppVersion:"1.1",cmpStatus:"stub",cmpDisplayStatus:"hidden",signalStatus:"not ready",supportedAPIs:e,cmpId:10,sectionList:[],applicableSections:[-1],gppString:"",parsedSections:{}}},!0)}else if("removeEventListener"===n){for(var i=!1,o=0;o<__gpp.events.length;o++)if(__gpp.events[o].id==p){__gpp.events.splice(o,1),i=!0;break}a({eventName:"listenerRemoved",listenerId:p,data:i,pingData:{gppVersion:"1.1",cmpStatus:"stub",cmpDisplayStatus:"hidden",signalStatus:"not ready",supportedAPIs:e,cmpId:10,sectionList:[],applicableSections:[-1],gppString:"",parsedSections:{}}},!0)}else"hasSection"===n?a(!1,!0):"getSection"===n||"getField"===n?a(null,!0):__gpp.queue.push([].slice.apply(t))},window.__gpp_msghandler=function(e){var t="string"==typeof e.data;try{var n=t?JSON.parse(e.data):e.data}catch(e){n=null}if("object"==typeof n&&null!==n&&"__gppCall"in n){var a=n.__gppCall;window.__gpp(a.command,(function(n,p){var s={__gppReturn:{returnValue:n,success:p,callId:a.callId}};e.source.postMessage(t?JSON.stringify(s):s,"*")}),"parameter"in a?a.parameter:null,"version"in a?a.version:"1.1")}},"__gpp"in window&&"function"==typeof window.__gpp||(window.__gpp=window.__gpp_stub,window.addEventListener("message",window.__gpp_msghandler,!1),window.__gpp_addFrame("__gppLocator"))}();var s=function(){var e=arguments;typeof window.__uspapi!==s&&setTimeout((function(){void 0!==window.__uspapi&&window.__uspapi.apply(window.__uspapi,e)}),500)};if(void 0===window.__uspapi){window.__uspapi=s;var i=setInterval((function(){p++,window.__uspapi===s&&p<3?console.warn("USP is not accessible"):clearInterval(i)}),6e3)}}();
|
||
</script>
|
||
|
||
<script async>
|
||
(function(w, d, s, l, i) {
|
||
w[l] = w[l] || [];
|
||
w[l].push({'gtm.start': new Date().getTime(), event: 'gtm.js'});
|
||
var f = d.getElementsByTagName(s)[0], j = d.createElement(s), dl = l != 'dataLayer' ? '&l=' + l : '';
|
||
j.async = true;
|
||
j.src = 'https://www.googletagmanager.com/gtm.js?id=' + i + dl;
|
||
f.parentNode.insertBefore(j,f);
|
||
})(window, document, 'script', 'dataLayer', 'GTM-K25QL22');
|
||
</script>
|
||
|
||
<script>
|
||
window.ga=window.ga||function(){(ga.q=ga.q||[]).push(arguments)};ga.l=+new Date;
|
||
ga('create', 'UA-410289-1', 'auto');
|
||
ga('require', 'linkid', 'linkid.js');
|
||
ga('require', 'GTM-TSD9TZP');
|
||
ga('set', 'siteSpeedSampleRate', 25);
|
||
</script>
|
||
<script async src="https://www.google-analytics.com/analytics.js"></script>
|
||
<script async>var analytics = {
|
||
'dimension1': 'Performance',
|
||
'dimension2': 'article/analysis',
|
||
'dimension3': '2019-09-25',
|
||
'dimension4': '0',
|
||
'dimension5': '',
|
||
'dimension7': 'Transmission Control Protocol, memory, application',
|
||
'dimension8': 'vmoksha',
|
||
'dimension9': 'undefined',
|
||
'dimension10': ''
|
||
};
|
||
|
||
if (window.ga) {
|
||
Object.keys(analytics).forEach(function(key) {
|
||
window.ga('set', key, analytics[key]);
|
||
});
|
||
|
||
window.ga('send', 'pageview');
|
||
}</script>
|
||
|
||
<script src="https://dz2cdn1.dzone.com/themes/dz20/lib/static/jquery/jquery.min.js"></script>
|
||
<script async src="https://dz2cdn1.dzone.com/themes/dz20/lib/static/bootstrap/bootstrap.min.js"></script>
|
||
|
||
<script>
|
||
function loadScript(src) {
|
||
return new Promise(function (resolve, reject) {
|
||
const s = document.createElement('script');
|
||
s.src = src;
|
||
s.onload = resolve;
|
||
s.onerror = reject;
|
||
document.head.appendChild(s);
|
||
});
|
||
}
|
||
|
||
function loadStyle(href) {
|
||
const link = document.createElement('link');
|
||
link.rel = 'stylesheet';
|
||
link.href = href;
|
||
document.head.appendChild(link);
|
||
}
|
||
|
||
function loadScriptsSync(deferred) {
|
||
var p = Promise.resolve();
|
||
for (var i = 0; i < deferred.length; i++) {
|
||
let script = deferred[i];
|
||
p = p.then(function() {
|
||
return loadScript(script);
|
||
});
|
||
}
|
||
return p;
|
||
}
|
||
|
||
function loadStyles() {
|
||
const deferred = [
|
||
'https://dz2cdn1.dzone.com/themes/dz20/lib/codemirror/lib/codemirror.css',
|
||
'https://dz2cdn1.dzone.com/themes/dz20/ftl/comments/styles.css',
|
||
'https://dz2cdn1.dzone.com/themes/dz20/lib/froala3/css/froala_editor.pkgd.min.css',
|
||
'https://dz2cdn1.dzone.com/themes/dz20/lib/froala3/css/themes/gray.min.css',
|
||
'https://dz2cdn1.dzone.com/themes/dz20/ftl/article/mini-profile.css'
|
||
];
|
||
|
||
for (var i = 0; i < deferred.length; i++) {
|
||
loadStyle(deferred[i]);
|
||
}
|
||
}
|
||
|
||
window.addEventListener('load', function(_event) {
|
||
loadStyles();
|
||
|
||
loadScriptsSync([
|
||
'https://dz2cdn1.dzone.com/themes/dz20/lib/lazysizes.min.js',
|
||
'https://dz2cdn1.dzone.com/themes/dz20/ftl/article/codeblocks.js',
|
||
'https://dz2cdn1.dzone.com/themes/dz20/ftl/article/activity-bar.js',
|
||
'https://dz2cdn1.dzone.com/themes/dz20/lib/froala3/js/froala_editor.pkgd.min.js',
|
||
'https://dz2cdn1.dzone.com/themes/dz20/ftl/froala/content.js',
|
||
'https://dz2cdn1.dzone.com/themes/dz20/ftl/comments/content.js',
|
||
'https://dz2cdn1.dzone.com/themes/dz20/ftl/article/content.js'
|
||
]);
|
||
});
|
||
</script>
|
||
</body>
|
||
</html>
|