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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

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IBM pSeries User Manual Page 30