Formatting the sample trace

Use the trcrpt command to format the trace report.

# trcrpt -O "exec=on,pid=on" trc_raw > cp.rpt

This reports both the fully qualified name of the file that is run and the process ID that is assigned to it.

The report file shows us that there are numerous VMM page assign and delete events in the trace, like the following sequence:

1B1 ksh            8526          0.003109888       0.162816
         VMM page delete:      V.S=0000.150E ppage=1F7F
             working_storage delete_in_progress process_private computational

1B0 ksh            8526          0.003141376       0.031488
         VMM page assign:      V.S=0000.2F33 ppage=1F7F
             working_storage delete_in_progress process_private computational

We are not interested in this level of VMM activity detail at the moment, so we reformat the trace as follows:

# trcrpt -k "1b0,1b1" -O "exec=on,pid=on" trc_raw > cp.rpt2

The -k "1b0,1b1" option suppresses the unwanted VMM events in the formatted output. It saves us from having to retrace the workload to suppress unwanted events. We could have used the -k function of the trcrpt command instead of that of the trace command to suppress the lockl() and unlockl() events, if we had believed that we might need to look at the lock activity at some point. If we had been interested in only a small set of events, we could have specified -d "hookid1,hookid2" to produce a report with only those events. Because the hook ID is the leftmost column of the report, you can quickly compile a list of hooks to include or exclude. A comprehensive list of trace hook IDs is defined in the /usr/include/sys/trchkid.h file.