Sources
Apache has many ways of doing multiprocessing
- MPM Prefork
- parent process spawns worker children
- each child has a single thread
- required if you are running a module which isn't threadsfe e.g. mod_php
- -- can be resource intensive comapred to other MPM options
- MPM Worker
- parent process spawns worker children
- each child can have many threads
- more efficient than MPM Prefork in most cases
- MPM Event
- Similar to MPM worker
- Each child process has a listener thread which directs request to a worker thread
- helps avoid threads getting stuck with long KeepAliveTimeouts
- mpm_winnt
- Windows MPM
- Others
- there are a few more niche MPM options
The exact configuration directives available depend on which MPM module you are using
Default apache Timeout is 60s which is quite long - maybe we should shorten?
What is the timeout for an ELB?