It's clear from looking at documentation that Apache's ServerLimit will cause extra shared memory to be assigned.

If ServerLimit is set to a value much higher than necessary, extra, unused shared memory will be allocated.

I understand that memory will be assigned/used when Apache starts up processes, the limit to the number of those being controlled by MaxRequestWorkers. And ServerLimit is a hard limit for MaxRequestWorkers. So why does ServerLimit allocate any memory, and how can I get an idea how much?

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