[Darshan-users] Darshan Fortran wrapper on Blue Gene Q

[Harms, Kevin N.]

Kay,

  there are two issues here:

  (1) The wrapper generators don't work for BG/Q. I'm attaching some
modified ones for you. I believe that should allow all C, C++ and F77
codes to work.

  (2) There is an ongoing issue with IBM and the F90 MPI library. This
library is bypassing MPI_Init and calling PMPI_Init directly. One work
around is to link with the mpixlf77 wrapper. I have a PMR open on the
issue but haven't received any updates yet.

kevin


>Hello,
>
>We installed Darshan in Juelich for our users to help them analyzing
>their I/O patterns and identifying potential bottlenecks. Our Blue Gene
>Q system (JUQUEEN) runs driver version V1R2M2. Everything works fine
>with the C compiler wrapper but the ones for Fortran and C++ don't seem
>to work. I tested both version 2.3.0 and 2.3.1-pre2.
>
>For the Fortran wrapper we have no libmpifort, libfmpich.cnk or
>libfmpich on our system but only libmpichf90-xl (and versions for f77,
>or gcc but non of the ). So I needed to change FMPICH in the wrapper. I
>tried different variations (empty, -lmpichf90-xl, "-lmpichf90-xl
>-lmpich-xl") but non of those made a simple Fortran test program use the
>instrumented calls of Darshan. An "nm" on the binary shows the same
>symbols with "darshan" in their names in both the C and the Fortran
>version, so it seems to be used during linking.
>
>Darshan is a great tool we would also like to offer to users using
>Fortran or C++ codes, too.
>
>Did anybody already successfully install Darshan on a platform with a
>similar setup? Since linking succeeds and the applications run I have no
>idea how to find the cause of this problem although the FMPICH variable
>seems most promising. Any ideas on how to fix this issue would be
>appreciated.
>
>Thanks,
>Kay
>
>--
>Dr. Kay Thust
>Juelich Supercomputing Centre
>Institute for Advanced Simulation
>Forschungszentrum Juelich GmbH
>
>
>
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