Ways to Improve Performance

Profile-Based Optimization

Storing Profile Information for Multiple Programs

A single flow.data file can store information for multiple programs. This allows an instrumented program to spawn other instrumented programs, all of which share the same flow.data file.

To allow multiple programs to save their data in the same flow.data file, a program's profile data is uniquely identified by the executable's basename (see basename(1)), the executable's file size, and the time the executable was last modified.

Instead of using the executable's basename, you can specify a basename by setting the environment variable PBO_PGM_PATH. This is useful when a number of programs are actually linked to the same instrumented executables.

For example, consider profiling the ls, lsf and lsx commands. (lsx is ls with the -xoption and lsf is ls with the -Foption.) Since the three commands could be linked to the same instrumented executables, the developer might want to collect profile data under a single basename by setting PBO_PGM_PATH=ls. If PBO_PGM_PATH=ls were not set, profile data would be saved under the ls, the lsf, and the lsx basenames.

When an instrumented program begins execution, it checks whether the basename, size, and time-stamp match those in the existing flow.data file. If the basename matches but the size or time-stamp does not match, that probably means that the program has been relinked since it last created profile data. In this case, the following error message will be issued:

program: Can't update counters. Profile data exists

but does not correspond to this executable. Exit.

You can fix this problem any one of these ways:

•Remove or rename the existing flow.data file.

•Run the instrumented program in a different working directory.

•Set the FLOW_DATA environment variable so that profile data is written to a file other than flow.data.

•Rename the instrumented program.

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Kenwood HP 9000 manual Storing Profile Information for Multiple Programs
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HP 9000 specifications

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