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| <H1 ALIGN="CENTER">Hints on Running a High-Performance Web Server</H1> |
| |
| 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="perf-hp.html">HPUX</A> |
| <LI><A HREF="#Linux">Linux</A> |
| <LI><A HREF="#Solaris">Solaris</A> |
| <LI><A HREF="#SunOS">SunOS 4.x</A> |
| </UL> |
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| <HR> |
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| <H3><A NAME="AUX"> |
| A/UX (Apple's UNIX) |
| </A></H3> |
| |
| If you are running Apache on A/UX, a page that gives some helpful |
| performance hints (concerning the <EM>listen()</EM> queue and using |
| virtual hosts) |
| <A HREF="http://www.jaguNET.com/apache.html">can be found here</A> |
| |
| <P><HR> |
| |
| <H3><A NAME="BSD"> |
| BSD-based (BSDI, FreeBSD, etc) |
| </A></H3> |
| |
| <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> |
| |
| <H3><A NAME="DEC"> |
| Digital UNIX |
| </A></H3> |
| |
| <UL> |
| <LI><A |
| HREF="http://www.digital.com/info/internet/document/ias/tuning.html" |
| >DIGITAL UNIX Tuning Parameters for Web Servers</A> |
| <LI>We have some <A HREF="perf-dec.html">newsgroup postings</A> on how |
| to tune Digital UNIX 3.2 and 4.0. |
| </UL> |
| |
| <P><HR> |
| |
| <H3><A NAME="Linux"> |
| Linux |
| </A></H3> |
| |
| 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> |
| |
| <H3><A NAME="Solaris"> |
| Solaris 2.4 |
| </A></H3> |
| |
| 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. |
| |
| <P> |
| |
| Other links: |
| |
| <UL> |
| |
| <LI><A HREF="http://www.sun.com/sun-on-net/performance.html"> |
| World Wide Web Server Performance, |
| <http://www.sun.com/sun-on-net/performance.html></A> |
| <LI><A HREF="http://www.rvs.uni-hannover.de/people/voeckler/tune/EN/tune.html"> |
| Solaris 2.x - tuning your TCP/IP stack</A> contains some good technical |
| information about tuning various Solaris TCP/IP parameters. |
| </UL> |
| |
| <P><HR> |
| |
| <H3><A NAME="SunOS"> |
| SunOS 4.x |
| </A></H3> |
| |
| 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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