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System CPU is CPU time spent in kernel
mode. Usually it indicates some type of an I/O issue whether it's
lots of disk utilization, network utilization, network file
systems hanging e.g. NFS. You would need to review other metrics.
Vladimir
10/13/2015 u 01:49 PM, Kamran Khan je napisao/la:
Hi All,
This isn't a problem with Ganglia, but I was hoping I might
get a little advice on what I am seeing. I have a customer
who is running ls-dyna applications, and he is noticing
something odd. He is noticing his jobs being bogged down and
not running at their full capacity. He looked at the Ganglia
web interface and saw that "System CPU" was at 100%, while
"User CPU" was at like 20%. What processes does the "System
CPU" refer to? What tools can I use to track what might be
pushing the "System CPU" to 100%? There are times when the
"User CPU" goes up to 100%, which is what he wants, but then
at times it spikes down to 20% ish and the "System CPU" stays
up around 100%.
Any advice is greatly appreciated. If you need me to send
output, I certainly can. Just let me know what to run.
Please let me know.
Thanks.
--
Kamran Khan
PSSC Labs
HPC Software / Technical Engineer
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