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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<title>Running a High-Performance Web Server on HPUX - Apache HTTP Server Version 2.5</title>
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<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
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<body id="manual-page" class="no-sidebar"><div id="page-header">
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<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/quickreference.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
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<p class="apache">Apache HTTP Server Version 2.5</p>
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<img alt="" src="../images/feather.png" /></div>
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<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div>
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<div id="path">
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.5</a> > <a href="./">Platform Specific Notes</a></div><div id="page-content"><div id="preamble"><h1>Running a High-Performance Web Server on HPUX</h1>
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<div class="toplang">
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<p><span>Available Languages: </span><a href="../en/platform/perf-hp.html" title="English"> en </a> |
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<a href="../fr/platform/perf-hp.html" hreflang="fr" rel="alternate" title="Fran<61>ais"> fr </a> |
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<a href="../ko/platform/perf-hp.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
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</div>
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<pre>Date: Wed, 05 Nov 1997 16:59:34 -0800
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From: Rick Jones <<a href="mailto:raj@cup.hp.com">raj@cup.hp.com</a>>
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Reply-To: <a href="mailto:raj@cup.hp.com">raj@cup.hp.com</a>
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Organization: Network Performance
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Subject: HP-UX tuning tips</pre>
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<p>Here are some tuning tips for HP-UX to add to the tuning page.</p>
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<p>For HP-UX 9.X: Upgrade to 10.20<br />
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For HP-UX 10.[00|01|10]: Upgrade to 10.20</p>
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<p>For HP-UX 10.20:</p>
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<p>Install the latest cumulative ARPA Transport Patch. This
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will allow you to configure the size of the TCP connection
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lookup hash table. The default is 256 buckets and must be set
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to a power of two. This is accomplished with adb against the
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*disc* image of the kernel. The variable name is <code>tcp_hash_size</code>.
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Notice that it's critically important that you use "<code>W</code>"
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to write a 32 bit quantity, not "<code>w</code>" to write a 16 bit
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value when patching the disc image because the <code>tcp_hash_size</code>
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variable is a 32 bit quantity.</p>
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<p>How to pick the value? Examine the output of <a href="ftp://ftp.cup.hp.com/dist/networking/tools/connhist">ftp://ftp.cup.hp.com/dist/networking/tools/connhist</a>
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and see how many total TCP connections exist on the system. You
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probably want that number divided by the hash table size to be
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reasonably small, say less than 10. Folks can look at HP's
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SPECweb96 disclosures for some common settings. These can be
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found at <a href="http://www.specbench.org/">http://www.specbench.org/</a>.
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If an HP-UX system was performing at 1000 SPECweb96 connections
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per second, the <code>TIME_WAIT</code> time of 60 seconds would mean
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60,000 TCP "connections" being tracked.</p>
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<p>Folks can check their listen queue depths with <a href="ftp://ftp.cup.hp.com/dist/networking/misc/listenq">ftp://ftp.cup.hp.com/dist/networking/misc/listenq</a>.</p>
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<p>If folks are running Apache on a PA-8000 based system, they
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should consider "chatr'ing" the Apache executable to have a
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large page size. This would be "<code>chatr +pi L <BINARY></code>".
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The GID of the running executable must have <code>MLOCK</code> privileges.
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<code>Setprivgrp(1m)</code> should be consulted for assigning
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<code>MLOCK</code>. The change can be validated by running Glance
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and examining the memory regions of the server(s) to make sure that
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they show a non-trivial fraction of the text segment being locked.</p>
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<p>If folks are running Apache on MP systems, they might
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consider writing a small program that uses <code>mpctl()</code>
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to bind processes to processors. A simple <code>pid % numcpu</code>
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algorithm is probably sufficient. This might even go into the
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source code.</p>
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<p>If folks are concerned about the number of <code>FIN_WAIT_2</code>
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connections, they can use nettune to shrink the value of
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<code>tcp_keepstart</code>. However, they should be careful there -
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certainly do not make it less than oh two to four minutes. If
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<code>tcp_hash_size</code> has been set well, it is probably OK to
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let the <code>FIN_WAIT_2</code>'s take longer to timeout (perhaps
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even the default two hours) - they will not on average have a big
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impact on performance.</p>
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<p>There are other things that could go into the code base, but
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that might be left for another email. Feel free to drop me a
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message if you or others are interested.</p>
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<p>sincerely,</p>
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<p>rick jones</p>
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<p><a href="http://www.netperf.org/netperf/">http://www.netperf.org/netperf/</a></p>
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</div>
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</div>
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<div class="bottomlang">
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<p><span>Available Languages: </span><a href="../en/platform/perf-hp.html" title="English"> en </a> |
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<a href="../fr/platform/perf-hp.html" hreflang="fr" rel="alternate" title="Fran<61>ais"> fr </a> |
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<a href="../ko/platform/perf-hp.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
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</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
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<p class="apache">Copyright 2019 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
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