Archive for April 11th, 2011

apache – How can I change from prefork to worker MPM on CentOS

I’m running CentOS 64 bit, and jsut found out I am running prefork MPM on my dual quad xeon. I was told worker will give me lower memory usage, and higher performance, since I run a very high traffic website.

If this is true, how do I do it?

Edit: /etc/sysconfig/httpd

Uncomment:

HTTPD=/usr/sbin/httpd.worker

Restart, voila!

After restarting httpd, I ran “ps -ef | grep -i http” and got this:

[root@localhost httpd]# ps -ef | grep -i http
root     16334 17289  0 10:44 pts/1    00:00:00 grep -i http
root     30536     1  0 10:00 ?        00:00:00 /usr/sbin/httpd.worker
apache   30539 30536  0 10:00 ?        00:00:00 /usr/sbin/httpd.worker
apache   30541 30536  0 10:00 ?        00:00:02 /usr/sbin/httpd.worker
[root@localhost httpd]# 

 

If I switch the /etc/sysconfig/httpd back to the default, the ps output is like this:

[root@localhost httpd]# ps -ef | grep -i http
root     16447     1  0 10:47 ?        00:00:00 /usr/sbin/httpd
apache   16448 16447  0 10:47 ?        00:00:00 /usr/sbin/httpd
apache   16449 16447  0 10:47 ?        00:00:00 /usr/sbin/httpd
apache   16450 16447  0 10:47 ?        00:00:00 /usr/sbin/httpd
apache   16451 16447  0 10:47 ?        00:00:00 /usr/sbin/httpd
apache   16453 16447  0 10:47 ?        00:00:00 /usr/sbin/httpd
apache   16454 16447  0 10:47 ?        00:00:00 /usr/sbin/httpd
apache   16455 16447  0 10:47 ?        00:00:00 /usr/sbin/httpd
apache   16456 16447  0 10:47 ?        00:00:00 /usr/sbin/httpd
root     16458 17289  0 10:47 pts/1    00:00:00 grep -i http
[root@localhost httpd]# 

via apache – How can I change from prefork to worker MPM on CentOS 64bit? – Server Fault.