01-26-2010
That sy is higher than us just means the kernel has much more to do. That should be because the software is written like this, I would guess. To check in detail what is going on CPU-wise, have look at
tprof maybe:
AIX 5.2 performance tools update, Part 3
I have no experience with tprof myself but maybe you get something of worth out of it analysing it.
You could also try again with enabling/disabling SMT (smtctl [on|off]) check for different behaviour, depending if the application has lot's of processes or is written mulithreaded (check with svmon -P| grep -p Pid). If SMT is working fine ie. dispatching works smooth, can be checked with "mpstat -s 1" (see
System p education).
Checking how the work is distributed on the different (logical/virtual) CPUs can be done with sar -P ALL 1 9999 for example.
This one might be interessting for you too:
http://www.ibm.com/developerworks/wi...len+CPU+cycles
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