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Accepted
Andrew Fashion
Asked: 2011-01-12 00:10:00 +0800 CST

How can I change from prefork to worker MPM on CentOS 64bit?

  • 772

I'm running CentOS 64 bit, and just 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?

centos apache-2.2 mpm-worker mpm-prefork

4 Answers

  1. Best Answer

    Edit: /etc/sysconfig/httpd

    Uncomment:

    HTTPD=/usr/sbin/httpd.worker

    Restart, voila!

    • 27

  2. CentOS 6x:

    modify file: /etc/sysconfig/httpd

    HTTPD=/usr/sbin/httpd.worker

    CentOS 7x:

    $ cat /etc/httpd/conf.modules.d/00-mpm.conf

    #LoadModule mpm_prefork_module modules/mod_mpm_prefork.so
    LoadModule mpm_worker_module modules/mod_mpm_worker.so
    #LoadModule mpm_event_module modules/mod_mpm_event.so

    Restart

    • 8

  3. Edited: /etc/sysconfig/httpd

    And uncommented:

    HTTPD=/usr/sbin/httpd.worker

    After restarting httpd (service httpd restart) I get the following error:

    Stopping httpd:                                            [  OK  ]
Starting httpd: httpd.worker: Syntax error on line 222 of /etc/httpd/conf/httpd.conf: Syntax error on line 9 of /etc/httpd/conf.d/php.conf: Cannot load /etc/httpd/modules/libphp5-zts.so into server: /etc/httpd/modules/libphp5-zts.so: cannot open shared object file: No such file or directory
                                                           [FAILED]

    You might need to install php-zts though.

    yum install php-zts

    After that no more error messages and httpd is starting normally with module worker active.

    • 4

  4. -- Redhat Enterprise Linux 6

    php-zts in RHEL is found in the "optional" repository:

    # subscription-manager repos --enable rhel-6-server-optional-rpms
Repository 'rhel-6-server-optional-rpms' is enabled for this system.
# yum install php-zts
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