:: Determine which MPM running in apache
apachectl -l
if you see worker.c, your apache running worker mpm, if you see prefork.c, apache running prefork.
:: Determine has apache worked mpm compiled
httpd.worker -l
make sure you see worker.c on there.
:: How to change apache prefork mpm to worker mpm on linux centos
vi /etc/sysconfig/httpd # uncomment on this line HTTPD=/usr/sbin/httpd.worker
then restarting apache
/etc/init.d/httpd restart
:: Links
+ Google
+ CrisGilligan