more than php a php library. Quite often it's a database one that creates those loop. Maybe while waiting for a big query to end (should sleep but libs are not always done the right way :) ) 

2010/6/16 Tapas Mishra <mightydreams@gmail.com>
On Wed, Jun 16, 2010 at 7:08 PM, Mark Watts <m.watts@eris.qinetiq.com> wrote:
>
> 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.

Thanks for the information.This is not occurring at regular
intervals.I noticed it today only.
And when this happens I can not do an SSH to the server about whom I
am reporting the problem.


--
Tapas
http://mightydreams.blogspot.com
http://wiki.xensource.com/xenwiki/Xen_on_4_app_servers

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--
Frank Contrepois
Coblan srl