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Making Software Performance Measurements
To set up the trace command for activity measurements
To set up the trace command for activity
measurements
Specify a trace display depth of 512.
1
Trace after any state, store all states, and count time.
2
Before you initialize and run performance measurements, the current trace
command (in other words, the last trace command entered) must be properly
set up.
In general, you want to give the SPMT as many trace states as possible to
post-process, so you should increase the trace depth to the maximum
number, as shown in the following command.
If you wish to measure activity as a percentage of all activity, the current
trace command should be the default (in other words, trace <RETURN>).
The default trace command triggers on any state, and all captured states are
stored. It is important that time be counted by the analyzer; otherwise, the
SPMT measurements will not be correct. Also, since states are stored "after"
the trigger state, the maximum number of captured states appears in each
trace list.
You can qualify trace commands any way you like to obtain specific
information. However, when you qualify the states that get stored in the
trace memory, your SPMT results will be biased by your qualifications; the
percentages shown will be of only those states stored in the trace list.
Examples
To specify a trace depth of 512:
display trace depth 512
To trace after any state, store all states, and count time:
trace counting time
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