http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47618
Summary: Collecting multiple profiles and using all for PGO Product: gcc Version: 4.6.0 Status: UNCONFIRMED Severity: enhancement Priority: P3 Component: gcov-profile AssignedTo: unassig...@gcc.gnu.org ReportedBy: rol...@rschulz.eu Currently only the file from one profiling run can be used for PGO. Especially for MPI programs it would be nice if several folders containing profiling files could be merged or several directories could be used together for -fprofile-use. For saving the profiling files it would be great if the folder name could contain an environment variable or could be set by an environment variable. Thus I suggest that one could either say: -fprofile-dir /some/path/%q{SOME_ENV} #same syntax as valgrind or export GCC_PROFILE_DIR=/some/path/$SOME_ENV This would be very useful because MPI implementation provide the MPI rank as a environment variable. Thus with the suggestion one could store the profile of each MPI rank in a different folder.