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PHP 5.1.6 - Non-Thread Safe ( Thread Safety=disabled in phpinfo() )
Apache 2.2.3 - MPM prefork

Should I be using prefork or worker? If so is this an easy switch?

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up vote 2 down vote accepted

In general you should always use prefork with mod_php. Most Linux distributions do not allow to install mpm_worker-providing package with mod_php.

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