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From Eric Covener <>
Subject Re: [users@httpd] MPM worker - ThreadLimit and ThreadsPerChild
Date Fri, 24 Aug 2018 19:46:02 GMT
On Fri, Aug 24, 2018 at 3:42 PM Campbell, Lance <> wrote:
> Apache 2.4
> MPM Worker
> The relationship between ThreadLimit and ThreadsPerChild is not very clear.  These are
some questions I have.
> Why would you ever want ThreadLimit bigger than ThreadsPerChild?
Obscure: So you can raise ThreadsPerChild during a graceful restart

> If you do want it bigger then how do you determine how much bigger it should be?
Just by how much you'd do the above.

> If ThreadLimit is bigger than ThreadsPerChild should you then use ThreadLimit instead
of ThreadsPerChild to calculate the ServerLimit?
Yes, but in practice you just don't need a ThreadLimit higher than


I would say decide on MaxRequestWorkers first. Then decide on the mix
between threads and processes you want (ThreadsPerChild) which then
dictates both ThreadLimit and ServerLimit.

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