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Submitted by: rick jones <raj@cup.hp.com> PR: 3214 git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@82302 13f79535-47bb-0310-9956-ffa450edef68
123 lines
3.8 KiB
HTML
123 lines
3.8 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML>
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<HEAD>
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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
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TEXT="#000000"
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LINK="#0000FF"
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ALINK="#FF0000"
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<A 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 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 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>
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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
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<P>
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For HP-UX 10.20:
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<P>
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Install the latest cumulative ARPA Transport Patch. This will allow you
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to configure the size of the TCP connection lookup hash table. The
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default is 256 buckets and must be set to a power of two. This is
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accomplished with adb against the *disc* image of the kernel. The
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variable name is tcp_hash_size.
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Notice that it's critically important that you use "W" to write a 32 bit
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quantity, not "w" to write a 16 bit value when patching the disc image because
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the tcp_hash_size variable is a 32 bit quantity.
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<P>
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How to pick the value? Examine the output of
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<A HREF="ftp://ftp.cup.hp.com/dist/networking/tools/connhist">
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ftp://ftp.cup.hp.com/dist/networking/tools/connhist</A> and see how many
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total TCP connections exist on the system. You probably want that number
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divided by the hash table size to be reasonably small, say less than 10.
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Folks can look at HP's SPECweb96 disclosures for some common settings.
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These can be found at <A HREF="http://www.specbench.org/">
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http://www.specbench.org/</A>. If an HP-UX system was
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performing at 1000 SPECweb96 connections per second, the TIME_WAIT time
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of 60 seconds would mean 60,000 TCP "connections" being tracked.
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<P>
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Folks can check their listen queue depths with
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<A HREF="ftp://ftp.cup.hp.com/dist/networking/misc/listenq">
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ftp://ftp.cup.hp.com/dist/networking/misc/listenq</A>.
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<P>
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If folks are running Apache on a PA-8000 based system, they should
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consider "chatr'ing" the Apache executable to have a large page size.
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This would be "chatr +pi L <BINARY>." The GID of the running executable
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must have MLOCK privileges. Setprivgrp(1m) should be consulted for
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assigning MLOCK. The change can be validated by running Glance and
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examining the memory regions of the server(s) to make sure that they
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show a non-trivial fraction of the text segment being locked.
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<P>
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If folks are running Apache on MP systems, they might consider writing a
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small program that uses mpctl() to bind processes to processors. A
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simple pid % numcpu algorithm is probably sufficient. This might even go
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into the source code.
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<P>
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If folks are concerned about the number of FIN_WAIT_2 connections, they
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can use nettune to shrink the value of tcp_keepstart. However, they
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should be careful there - certainly do not make it less than oh two to
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four minutes. If tcp_hash_size has been set well, it is probably OK to
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let the 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 performance.
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<P>
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There are other things that could go into the code base, but that might
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be left for another email. Feel free to drop me a message if you or
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others are interested.
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<P>
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sincerely,
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<P>
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rick jones<BR>
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<A HREF="http://www.cup.hp.com/netperf/NetperfPage.html">
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http://www.cup.hp.com/netperf/NetperfPage.html</A>
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<HR>
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<H3 ALIGN="CENTER">
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Apache HTTP Server Version 1.3
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</H3>
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