RE: Good Prefork Configuration for better performance ?? (Apache Users)

Prasanna,

Thanks for your valuable reply. My Apache was built from binary,so default MPM is PREFORK. Is there any way to switch

From prefork to worker without recompiling Apache ? I have found a way,which is uncomment the “worker” line from the

/etc/sysconfig/httpd (HTTPD=/usr/sbin/httpd.worker) file. But it causes the PHP stops its working.

Thanks.

Greetings ....

BipinDas

+966543680643

From: Prasanna Ram Venkatachalam [mailto:vpram86@xxxxxxxxx]
Sent: Sunday, June 07, 2009 8:39 AM
To: users@xxxxxxxxxxxxxxxx
Subject: Re: Good Prefork Configuration for better performance ??

Dear BipinDas, Under these loads i would suggest you to try Worker-MPM model. Because in prefork whatever you do, if you get 500 requests which are being served simultaneously, it would create 500 processes!! Its a one process per request model. So at higher load you would definitely run out of resources which is causing your server to hang perhaps. And the details you have provided are quite normal for your configuration. I get even more than that in my test scenarios!. The problem might be because of some peak load times which consumes your resources.

Also, is there any chances of number of simultaneous clients to go above 251 at peak loads? If so, try increasing that. (though i personally wont prefer prefork in high load scenarios)

Regards
Prasanna Ram

On Sat, Jun 6, 2009 at 8:30 PM, BipinDas-Gmail <bipinkdas@xxxxxxxxx> wrote:

Dear Friends.

One of my Webserver running with following configurations.

Processor : Intel(R) Xeon(R) CPU E5430 @ 2.66GHz

Memory : 4Giga

Apache : 2.2.3 (Installed from Binary)

MPM : Prefork

Some of output from the server is as follows (Almost All Time ….).

ps -ef | grep httpd | wc -l == 45

netstat -tn | wc -l == 1221

netstat -tn | grep ESTABLISHED | grep 443 | wc -l == 29

My Prefork configuration is as follows...

StartServers 8

MinSpareServers 5

MaxSpareServers 20

ServerLimit 251

MaxClients 251

MaxRequestsPerChild 4000

</IfModule>

My problem is sometimes server is shoot up with heavy load and hangs. I need to restart the Apache to settle down the load to normal.

This is Moodle installed server. Students uploading Assignments, checking for timetable, will attend Quiz and online exams. MySQL is

also running in the same server. I suspect Apache is causing the load problem.

Please recommend a perfect Prefork configuration on the above scenario.

Thanks in Advance.

Greetings ....

BipinDas

+966543680643