The Worker MPM turns Apache into a multi-process, multi-threaded web server. Unlike Prefork, each child process under Worker can have multiple threads.
If you use top or ps you will get something like this:
And sometimes is hard to find how many resources this service is using.
If you want to have the memory usage grouped by process, we could use the atop tool and then press ‘m’ (memory usage) and ‘p’ (group by process name). Example:
This will work with any multi-process, multi-threaded service 🙂
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