topic CPU load in Operating System - HP-UX

CPU load

System Unix — Wed, 03 Dec 2008 20:09:29 GMT

Hi,
We have a superdome with 128 cpus in which 96 are active.OS version is 11.31. when issueing the command uptime we see 1.34 1.20 1.20, while in glance ( v4.60) we see total cpu utilization ( in the upper bar) of cpu is 86% .
my question is how come that the overall cpu usage is less then 100% and yet the the load is more then 1.

thanks,
Reuven

Re: CPU load

James R. Ferguson — Thu, 04 Dec 2008 02:51:24 GMT

Hi Reuven:

You don't offer the value for you your glance sample/refresh time. I assume that you are running it at 5-10 seconds. The first of the three 'uptime' values is a one-minute average, so that says that the *average* queue depth during the last 60-seconds was ~ 1.34. It ia quite poasible that during the current few second interval this has dropped to ~ 0.86. I don't consider this significantly different in this context.

Regards!

...JRF...

Re: CPU load

Dennis Handly — Thu, 04 Dec 2008 04:15:40 GMT

uptime(1) and CPU percentage measure completely different things. If you have a valid percentage, ignore the bogus/useless uptime.
uptime measures the run queue length. This may be long if lots of processes are continually being created.

Re: CPU load

System Unix — Thu, 04 Dec 2008 19:58:26 GMT

thanks,
Reuven