Allow Apache use more memory

Question

I use apache2 behind nginx on 8 core CPU 48GB RAM server. Now my system uses only 3GB of all memory, but there are high load on CPUs. How can I use my free memory instead of CPUs time?

I also use memcached and xcache.

Your web applications may actually be CPU bound and simply don't need the additional memory... — HBruijn, Jan 15 '15 at 14:29

score 1 · Answer 1 · edited Jan 15 '15 at 13:09

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Well, try allowing more processes to apache. Here are some helpful links:

edited Jan 15 '15 at 13:09

Andrew Schulman

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answered Jan 15 '15 at 12:50

Christopher Taylor

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Link-only answers are discouraged on ServerFault, because if the links go dead the answer won't still be useful. Instead, please describe how the OP should allow more processes in Apache. – Andrew Schulman Jan 15 '15 at 13:10

score 1 · Answer 2 · answered Dec 27 '18 at 09:18

Enable HTTP persistent connections (Keep-Alive) in Apache configuration. In theory this will reduce CPU load (caused by tcp handshaking) and increase memory consumption (in a busy server) as Apache will spawn new worker processes / threads to server new requests.

Of course this is true in a stand alone Apache installation. You have much more variables in your equation (HTTP2 connections, SSL connections, nginx proxy).

Allow Apache use more memory

2 Answers2