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| <title>Hints on Running a High-Performance Web Server</title> |
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| <h2>Hints on Running a High-Performance Web Server</H2> |
| |
| Running Apache on a heavily loaded web server, one often encounters |
| problems related to the machine and OS configuration. "Heavy" is |
| relative, of course - but if you are seeing more than a couple hits |
| per second on a sustained basis you should consult the pointers on |
| this page. In general the suggestions involve how to tune your kernel |
| for the heavier TCP load, hardware/software conflicts that arise, etc. |
| |
| <UL> |
| <LI><A HREF="#AUX">A/UX (Apple's UNIX)</A> |
| <LI><A HREF="#BSD">BSD-based (BSDI, FreeBSD, etc)</A> |
| <LI><A HREF="#DEC">Digital UNIX</A> |
| <LI><A HREF="#HP">Hewlett-Packard</A> |
| <LI><A HREF="#Linux">Linux</A> |
| <LI><A HREF="#SGI">SGI</A> |
| <LI><A HREF="#Solaris">Solaris</A> |
| <LI><A HREF="#SunOS">SunOS 4.x</A> |
| </UL> |
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| <HR> |
| |
| <A NAME="AUX"> |
| <H3>A/UX (Apple's UNIX)</H3> |
| </A> |
| |
| If you are running Apache on A/UX, a page that gives some helpful |
| performance hints (concerning the <I>listen()</I> queue and using |
| virtual hosts) |
| <A HREF="http://www.jaguNET.com/apache.html">can be found here</A> |
| |
| <P><HR> |
| |
| <A NAME="BSD"> |
| <H3>BSD-based (BSDI, FreeBSD, etc)</H3> |
| </A> |
| |
| <A HREF="perf-bsd44.html#initial">Quick</A> and |
| <A HREF="perf-bsd44.html#detail">detailed</A> |
| performance tuning hints for BSD-derived systems. |
| |
| <P><HR> |
| |
| <A NAME="DEC"> |
| <H3>Digital UNIX</H3> |
| </A> |
| |
| We have some <A HREF="perf-dec.html">newsgroup postings</A> on how to |
| tune Digital UNIX 3.2 and 4.0. |
| |
| <P><HR> |
| |
| <A NAME="HP"> |
| <H3>Hewlett-Packard</H3> |
| </A> |
| |
| Some documentation on tuning HP machines can be found at <A |
| HREF="http://www.software.hp.com/internet/perf/tuning.html">http://www.software.hp.com/internet/perf/tuning.html</A>. |
| |
| <P><HR> |
| |
| <A NAME="Linux"> |
| <H3>Linux</H3> |
| </A> |
| |
| The most common problem on Linux shows up on heavily-loaded systems |
| where the whole server will appear to freeze for a couple of minutes |
| at a time, and then come back to life. This has been traced to a |
| listen() queue overload - certain Linux implementations have a low |
| value set for the incoming connection queue which can cause problems. |
| Please see our <a |
| href="http://www.qosina.com/~awm/apache/linux-tcp.html">Using Apache on |
| Linux</a> page for more info on how to fix this. |
| |
| <P><HR> |
| |
| <A NAME="SGI"> |
| <H3>SGI</H3> |
| |
| <UL> |
| <LI><A HREF="http://www.sgi.com/Products/WebFORCE/TuningGuide.html"> |
| WebFORCE Web Server Tuning Guidelines for IRIX 5.3, |
| <http://www.sgi.com/Products/WebFORCE/TuningGuide.html></A> |
| </UL> |
| |
| <P><HR> |
| |
| <A NAME="Solaris"> |
| <H3>Solaris 2.4</H3> |
| </A> |
| |
| The Solaris 2.4 TCP implementation has a few inherent limitations that |
| only became apparent under heavy loads. This has been fixed to some |
| extent in 2.5 (and completely revamped in 2.6), but for now consult |
| the following URL for tips on how to expand the capabilities if you |
| are finding slowdowns and lags are hurting performance. |
| |
| <UL> |
| |
| <LI><A href="http://www.sun.com/sun-on-net/Sun.Internet.Solutions/performance/"> |
| World Wide Web Server Performance, |
| <http://www.sun.com/sun-on-net/Sun.Internet.Solutions/performance/></a> |
| </UL> |
| |
| <P><HR> |
| |
| <A NAME="SunOS"> |
| <H3>SunOS 4.x</H3> |
| </A> |
| |
| More information on tuning SOMAXCONN on SunOS can be found at |
| <A HREF="http://www.islandnet.com/~mark/somaxconn.html"> |
| http://www.islandnet.com/~mark/somaxconn.html</A>. |
| |
| <P><HR> |
| |
| <H3>More welcome!</H3> |
| |
| If you have tips to contribute, send mail to <a |
| href="mailto:brian@organic.com">brian@organic.com</a> |
| |
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