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101 lines
4.2 KiB
HTML
101 lines
4.2 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta name="generator" content="HTML Tidy, see www.w3.org" />
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<title>Running a High-Performance Web Server on HPUX</title>
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</head>
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<!-- Background white, links blue (unvisited), navy (visited), red (active) -->
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<body bgcolor="#FFFFFF" text="#000000" link="#0000FF"
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vlink="#000080" alink="#FF0000">
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<a id="initial" name="initial"> </a>
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<!--#include virtual="header.html" -->
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<h1 align="CENTER">Running a High-Performance Web Server for
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HPUX</h1>
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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: raj@cup.hp.com
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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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Here are some tuning tips for HP-UX to add to the tuning page.
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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 tcp_hash_size.
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Notice that it's critically important that you use "W" to write
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a 32 bit quantity, not "w" to write a 16 bit value when
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patching the disc image because the tcp_hash_size variable is a
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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">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 TIME_WAIT time of 60 seconds would mean 60,000
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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">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 "chatr +pi L <BINARY>."
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The GID of the running executable must have MLOCK privileges.
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Setprivgrp(1m) should be consulted for assigning MLOCK. The
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change can be validated by running Glance and examining the
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memory regions of the server(s) to make sure that they show a
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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 mpctl() to bind
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processes to processors. A simple pid % numcpu algorithm is
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probably sufficient. This might even go into the source
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code.</p>
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<p>If folks are concerned about the number of FIN_WAIT_2
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connections, they can use nettune to shrink the value of
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tcp_keepstart. 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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tcp_hash_size has been set well, it is probably OK to let the
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FIN_WAIT_2's take longer to timeout (perhaps even the default
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two hours) - they will not on average have a big impact on
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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<br />
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<a
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href="http://www.cup.hp.com/netperf/NetperfPage.html">http://www.cup.hp.com/netperf/NetperfPage.html</a></p>
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<hr />
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<h3 align="CENTER">Apache HTTP Server Version 1.3</h3>
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<a href="./"><img src="../images/index.gif" alt="Index" /></a>
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<a href="../"><img src="../images/home.gif" alt="Home" /></a>
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</body>
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</html>
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