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Old 07-26-2007, 07:47 AM   #1
DotHQ
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Performance issue - finding top process


I have a web server that has started showing high load averages & high cpu usage.
Using SAR I can see the CPU and Load Average Stats easy enough. Lets say I see high CPU usage and a high Load average yesterday at 3:10pm.
Is there anything that can tell me what processes were running then, and most important how much CPU percentage each process was using at that time?

TIA!!!
 
Old 07-26-2007, 11:56 AM   #2
unSpawn
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IIRC, no. Tools like SAR, Atsar and dstat provide a global stats. To get a close-up view you could run 'atop' in logging mode and later replay the data. Another way could be to run something (lame) like this
Code:
__genCpuhoglist() { 
/bin/ps -eo %C -eo pid,command|sort -bgr -k1|head -10|while \
read cpu pid command; do [ ${cpu%%.*} -gt 5 ] && logger "CPU:\
 ${command%% *}: ${cpu}%"; done; sleep 10s; # EDIT: if you use the right syntax :-]
__genCpuhoglist; }
which logs any hogs above 5 and sleeps for 10 seconds.

Last edited by unSpawn; 07-27-2007 at 11:20 AM.
 
Old 07-26-2007, 07:49 PM   #3
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Thanks unSpawn! Not lame at all. I will try both of your ideas.
 
  


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