Date: Mon, 5 Jul 1999 16:26:13 -0700 (PDT) From: Cliff Skolnick <cliff@steam.com> To: Gary Palmer <gpalmer@FreeBSD.ORG> Cc: JMS Internet <webmaster@jmsinternet.com>, Alfred Perlstein <bright@rush.net>, freebsd-stable@FreeBSD.ORG Subject: Re: Server Slowdown Message-ID: <Pine.BSF.4.10.9907051618510.31545-100000@lazlo.internal.steam.com> In-Reply-To: <68110.931191733@noop.colo.erols.net>
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On Mon, 5 Jul 1999, Gary Palmer wrote: > Although you say you bumped up your apache limits, I bet you're > running across the hardcoded process limit. I think in apache.h there > is a #define which hard-limits the number of processes in the code. > That certainly seems to be your problem ... a fast connect and > sleeping for a few seconds before returning the page. Be very carefull about bumping maxclients too high as you will loose performance rapidly if your machine starts paging it's brains out. In high load situtuation it's usually better to serialize the requests than to start paging. I regularly do consulting for apache servers having performance problems, and over half the time it is a maxclients set to some outrageous number like 1800! Sure if you have more than 2GB of physical memory you may get away with this but most of these machines had 256MB or 512MB. I've already exchanged mail with the original poster, in this case it looks like he was disk bound by the looks of the "vmstat 5" output he sent. He had two IDE drives in the system but one was used as a backup. My advice was to moved the logs to the second disk and see what that does to performance. Cliff -- Cliff Skolnick | "They that can give up essential liberty to obtain Steam Tunnel Operations | a little temporary safety deserve neither liberty cliff@steam.com | nor safety." http://www.steam.com/ | -- Benjamin Franklin, 1759 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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