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From Mark Watts <>
Subject Re: [users@httpd] 100% CPU utilization by Apache
Date Wed, 16 Jun 2010 13:38:16 GMT
On Wed, 2010-06-16 at 10:36 +0530, Tapas Mishra wrote:
> I am having a front end server as Apache for hosting many websites.
> Today morning any of my domains were not accessible until I did an SSH
> to Apache server and saw
> 100% CPU utilization by Apache
> I am using Ubuntu 10.04 what can be reason for this behaviour of
> Apache and what should I check.

High CPU usage is generally caused by things like PHP which Apache has
no control over.

	strace -p <pid>

If you run this against the PID stuck at 100%, it should give you some
insight into what apache is doing. If you are lucky, you can match the
PID with a client IP (netstat -p) which will allow you to look in your
logs to see what that client is doing.

Mark Watts BSc RHCE MBCS
Senior Systems Engineer, Managed Services Manpower
QinetiQ - Delivering customer-focused solutions
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