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s.abbaasi avatar Server

mpm-prefork apache increasing MaxRequestWorkers not affecting my RAM to much

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s.abbaasi

I read about the Apache mpm-prefork configuration and I tried to tune the MaxRequestWorkers parameter. My settings before the change were as follows:

<IfModule mpm_prefork_module>
        StartServers            10
        MinSpareServers           10
        MaxSpareServers          64
        ServerLimit           512
        MaxRequestWorkers         500
        MaxConnectionsPerChild   0 
 </IfModule>

Then, because of increasing the concurrent users in my app, I decided to increase the MaxRequestWorkers from 500 to 670 and also ServerLimit from 512 to 700. Fortunately, the problem of slow connection was solved using these changes. But considering the reports from Apache2buddy, the average process memory is 16MB which means apache potentially needs at least 670*16 ~= 10GB of RAM. While my server has only 4GB of RAM. Now, using htop the usage of RAM is about 2.3GB and 400MB swap (from 1GB available)

  1. Why apache does not use more memory actually?
  2. What is the best config in my case? (using about 600 process count)
  3. Does my config has some bad consequences?

So what

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