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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 2.0</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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-<pre>
-Date: Wed, 05 Nov 1997 16:59:34 -0800
-From: Rick Jones <<a href="mailto:raj@cup.hp.com">raj@cup.hp.com</a>>
-Reply-To: <a href="mailto:raj@cup.hp.com">raj@cup.hp.com</a>
-Organization: Network Performance
-Subject: HP-UX tuning tips
-</pre>
-
- <p>Here are some tuning tips for HP-UX to add to the tuning page.</p>
-
- <p>For HP-UX 9.X: Upgrade to 10.20<br />
- For HP-UX 10.[00|01|10]: Upgrade to 10.20</p>
-
- <p>For HP-UX 10.20:</p>
-
- <p>Install the latest cumulative ARPA Transport Patch. This
- will allow you to configure the size of the TCP connection
- lookup hash table. The default is 256 buckets and must be set
- to a power of two. This is accomplished with adb against the
- *disc* image of the kernel. The variable name is <code>tcp_hash_size</code>.
- Notice that it's critically important that you use "<code>W</code>"
- to write a 32 bit quantity, not "<code>w</code>" to write a 16 bit
- value when patching the disc image because the <code>tcp_hash_size</code>
- variable is a 32 bit quantity.</p>
-
- <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>
- and see how many total TCP connections exist on the system. You
- probably want that number divided by the hash table size to be
- reasonably small, say less than 10. Folks can look at HP's
- SPECweb96 disclosures for some common settings. These can be
- found at <a href="http://www.specbench.org/">http://www.specbench.org/</a>.
- If an HP-UX system was performing at 1000 SPECweb96 connections
- per second, the <code>TIME_WAIT</code> time of 60 seconds would mean
- 60,000 TCP "connections" being tracked.</p>
-
- <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>
-
- <p>If folks are running Apache on a PA-8000 based system, they
- should consider "chatr'ing" the Apache executable to have a
- large page size. This would be "<code>chatr +pi L <BINARY></code>".
- The GID of the running executable must have <code>MLOCK</code> privileges.
- <code>Setprivgrp(1m)</code> should be consulted for assigning
- <code>MLOCK</code>. The change can be validated by running Glance
- and examining the memory regions of the server(s) to make sure that
- they show a non-trivial fraction of the text segment being locked.</p>
-
- <p>If folks are running Apache on MP systems, they might
- consider writing a small program that uses <code>mpctl()</code>
- to bind processes to processors. A simple <code>pid % numcpu</code>
- algorithm is probably sufficient. This might even go into the
- source code.</p>
-
- <p>If folks are concerned about the number of <code>FIN_WAIT_2</code>
- connections, they can use nettune to shrink the value of
- <code>tcp_keepstart</code>. However, they should be careful there -
- certainly do not make it less than oh two to four minutes. If
- <code>tcp_hash_size</code> has been set well, it is probably OK to
- let the <code>FIN_WAIT_2</code>'s take longer to timeout (perhaps
- even the default two hours) - they will not on average have a big
- impact on performance.</p>
-
- <p>There are other things that could go into the code base, but
- that might be left for another email. Feel free to drop me a
- message if you or others are interested.</p>
-
- <p>sincerely,</p>
-
- <p>rick jones</p>
-
- <p><a href="http://www.cup.hp.com/netperf/NetperfPage.html">http://www.cup.hp.com/netperf/NetperfPage.html</a></p>
-
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