HP Caliper supports diff reports for all measurements except the ones below:

•cgprof (HP-UX only)

•cpu (HP-UX only)

•cstack

•pmu_trace

•scgprof

Example of How to Use the caliper diff Command

Assume these two measurement runs:

$ caliper fprof -d fp1 cc himom.c

$ caliper fprof -d fp2 cc -c himom.c

And assume that the first collection (fp1) has data for these processes (on Linux, for example):

gcc (four instances) collect2 (two instances)

as cc1 ld

The second collection (fp2) has data for these processes: gcc (three instances)

as cc1

To produce a diff report, use this command:

$ caliper diff fp2 fp1

The report that is produced contains this data:

•Differences between the four gcc processes in the first run and the three gcc processes in the second run

•Differences between the as processes in the two runs

•Differences between the cc1 processes in the two runs

The collect2 and ld process data is ignored, because there is no matching process in the other database.

Creating Reports from Multiple Databases 119