I came across this Apache configuration:
<IfModule mpm_prefork_module>
StartServers 16
MinSpareServers 16
MaxSpareServers 32
ServerLimit 400
MaxClients 400
MaxRequestsPerChild 10000
</IfModule>
<IfModule mpm_worker_module>
StartServers 4
MaxClients 1024
MinSpareThreads 64
MaxSpareThreads 192
ThreadsPerChild 64
MaxRequestsPerChild 0
</IfModule>
Currently, only the mpm_prefork_module is installed. But what happens if the mpm_worker_module is installed on the server? This configuration worries me.
This question is similar, but the answer only says how to find the current MPM being used, not what the standard behavior is, or if the behavior is undefined.