Hey, What OS? What version of Apache? Could you show us an output of "free -m"?. What are the server specs? --Graham -----Original Message----- From: Bennett Haselton <bennett@xxxxxxxxxxxxx> Subj: [users@httpd] performance prob due to httpd's piling up Date: Sun May 7, 2006 11:24 pm Size: 1K To: users@xxxxxxxxxxxxxxxx I was running a stress test on a site that I run called StupidCensorship.com which frequently slows to a crawl due to high traffic. From running a stress test on it using "ab" that sent 1,000 concurrent requests to the site, I found that the number of running instances of /usr/sbin/httpd would rise from its initial default number of 22, up to 258, and then stay steady at 258. While the number was between 22 and 258, the site performance was still OK, but once it hit 258, the response time was a lot slower. I'm guessing this has something to do with the fact that while the number is climbing, the machine can just spawn a new instance of httpd to handle the request, but once it hits the maximum (due to hardware limits, I guess), new requests just get queued. Do these symptoms suggest any obvious way to improve performance, besides getting more RAM? (And even more RAM would, I assume, only raise the limit of "httpd" instances that could run, but it would still plateau once it hit that limit.) One possibility: I noticed that even after the stress test was over, the number of running 'httpd' instances would fall very slowly, about one per second, until it got back down to 22. I thought they were keeping the connection open, but my httpd.conf has KeepAlive set to Off. If I could somehow get the httpd instances to just exit memory once they were done, instead of hanging around, would that solve the performance problem without any negative side effects? -Bennett bennett@xxxxxxxxxxxxx http://www.peacefire.org (425) 497 9002 --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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