Moodle in English: Apache processes

Hardware and performance

Apache processes

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Apache processes

by Albert Ramsbottom - Wednesday, September 25, 2013, 3:26 PM

We have been having some issues with CPU with our Debian Moodle server. Its been showing a load average of 4 -5 and has been running slowly.

We add two more processor cores to it this morning which seems to have done the trick however I have noticed that some apache processes for brief periods of time are using 90% CPU, only for may be a second or so.

Is this normal? Is there a way of restricting each apache process to a CPU percentage?

Or might we have some settings wrong in the apache conf

Cheers

Re: Apache processes

by Howard Miller - Wednesday, September 25, 2013, 5:41 PM

A load average of 4-5 is not too bad if you have 8 cores (you don't say how many you had)

Apache using 100% CPU is not unreasonable as long as it doesn't go on for too long as this may indicate some process hogging the resources.

It can be hard to tell what those processes are actually doing. If it's there long enough to spot the process ID you could just use something like xdebug to work out what PHP is up to at the time.

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