tracking down excessive system cpu utilization

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I have a single cpu, rhel es 3.0 u 5 system that shows excessive 'system
cpu" utilization.
I think, but, am not sure that the httpd process is causing this.  Can
anyone suggest a method to find out:
1) what process is causing the system utilization to go up
2) what system calls are being made overall and how many of each?

Any help or suggestions on this would be appreciated.  This is a
production system, so rebooting or shutting down processes is not
desirable.

------------------
Marvin Blackburn
Systems Administrator
Glen Raven
"He's no failure.  He's not dead yet" --William Lloyd George  


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