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Submitted by: Tim Gerundt <tim@gerundt.de> git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@96822 13f79535-47bb-0310-9956-ffa450edef68
96 lines
3.9 KiB
XML
96 lines
3.9 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE manualpage SYSTEM "../style/manualpage.dtd">
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<?xml-stylesheet type="text/xsl" href="../style/manual.en.xsl"?>
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<manualpage>
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<relativepath href=".." />
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<title>Running a High-Performance Web Server on HPUX</title>
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<summary>
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<pre>
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Date: Wed, 05 Nov 1997 16:59:34 -0800
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From: Rick Jones <<a
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href="mailto:raj@cup.hp.com">raj@cup.hp.com</a>>
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Reply-To: <a href="mailto:raj@cup.hp.com"
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>raj@cup.hp.com</a>
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Organization: Network Performance
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Subject: HP-UX tuning tips
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</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
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href="ftp://ftp.cup.hp.com/dist/networking/tools/connhist"
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>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
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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
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href="ftp://ftp.cup.hp.com/dist/networking/misc/listenq"
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>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.cup.hp.com/netperf/NetperfPage.html"
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>http://www.cup.hp.com/netperf/NetperfPage.html</a></p>
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</summary>
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</manualpage>
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