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Subject: [MTT devel] extracting mca params
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2010-02-12 10:59:48

I see blocks of code like this in and some of the new analyzers:

        my $mca = $report->{command};
        $mca =~ s/^\s*$report->{launcher}//;
        $mca =~ s/\s(-n|--n|-np|--np)\s\S+//;
        $mca =~ s/\s(-rf|--rankfile)\s\S+//;
        $mca =~ s/\s(-hostfile|--hostfile)\s\S+//;
        $mca =~ s/\s(-host|--host)\s\S+//;
        $mca =~ s/\s*(-x)\s\S+//g;
        $mca =~ s/\s[\S\/\\]*$report->{test_name}.*//;
        $mca =~ s/\s\s/ /g;
        $mca =~ s/^\s+|\s+$//g;
        $phase_form->{mpi_mca} = $mca;

The problem I ran into is that at least some of the OMPI test suite executables have perl special characters in it (e.g., mpi2c++). It looks to me like the goal of this block is to obtain a list of the MCA parameters on the command line. Right? If so, I think this is a safer method, and will only get mca params (not other random mpirun parameters that don't happen to be listed in the regexps above):

        my @params;
        my $cmd = $report->{command};
        while ($cmd =~ s/\s([\-]*-mca)\s+(\S+)\s+(\S+)\s/ /) {
            push(@params, "$1 $2 $3");
        $phase_form->{mpi_mca} = join(' ', @params);

That being said, this *is* an Open MPI-specific field. MTT was supposed to remain MPI-agnostic.

Is there a reason you guys didn't use the MPI Details fields "parameters" and "network" for this purpose? We have an MPI::OMPI module which is perfect for doing OMPI-specific things. Using the MPI:: modules, you can keep MTT core clean so that we can run other MPI implementations through MTT as well.

I just committed:

that puts the above logic in MTT::Values::Functions::MPI::OMPI::find_mca_params() and converted MTTGDS and all the performance analyzers to call this function.

I also added a check in to ensure that the analyzer pm has PreReport before trying to call it.

Jeff Squyres
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