IBM pSeries - Manual (Page 30)

pshpstuningguidewp040105.doc Page 30
5.16 AIX 5L trace for daemon activity
If you suspect that a system daemon is causing a performance problem on your system, run
AIX 5L trace to check for daemon activity. For example, to find out which daemons are taking
up CPU time, use the following process:
trace -j 001,002,106,200,10c,134,139,465 -a -o /tmp/trace.aux -L 40000000 -T 20000000
sleep XX (XX is the time for your trace)
trcstop
trcrpt -O 'cpuid=on exec=on pid=on tid=on' /tmp/trace.aux > /tmp/trace.out
Look at /tmp/trace.out
pprof XX (XX is the time for your trace)
Look at:
pprof.cpu
pprof.famcpu
pprof.famind
pprof.flow
pprof.namecpu
pprof.start
pprof.cpu
You will find all these files on the $PWD at the time you run it.
tprof -c -A all -x sleep XX (XX is the time for your trace)
Look at: sleep.prof (you will find this file on the $PWD at the time you run it)
6.0 Conclusions and summary
Peak performance of HPS systems depends on properly tuning the HPS, and on correctly setting
application shell variables and AIX 5L tunables.
Because there are many sources of performance data, correct tuning takes time. As has been
demonstrated, the HPS performs very well. If tuning is needed, there are several good tools to use
to determine performance problems.
7.0 Additional reading
This section lists documents that contain additional information about the topics in this white
paper.
7.1 HPS documentation
pSeries High Performance Switch - Planning, Installation and Service, GA22-7951-02