Profiling Multiprocessed Executables

Profiling Multiprocessed Executables

You can gather either basic block and pc sampling profile data from executables that use the sproc and sprocsp system calls, such as those executables generated by POWER Fortran and POWER C. Prepare and run the job using the same method as for uniprocessed executables. For multiprocessed executables, each thread of execution writes its own separate profile data file. View these data files with prof like any other profile data files.

The only difference between multiprocessed and regular executables is the way in which the data files are named. When using pc sampling, the data files for multiprocessed executables are named process_id.prog_name. When using pixie, the data files are named prog_name.Counts.process_id. This naming convention avoids the potential conflict of multiple threads attempting to write simultaneously to the same file.