Ask and you shall receive! I got a tip from the MPICH2 guys about how they handle this stuff; it seems that the magic gfortran compiler flag is -Wl,-commons,use_dylibs. Thanks Dave Goodell!
I will commit this to the OMPI SVN trunk tonight (because it's an autotools-level change, which we try not to do during the workday), and will file tickets to get this change over to v1.4 and v1.5. While you're waiting for a release with this fix, you can either manually add -Wl,-commons,use_dylibs to your mpif77/mpif90 command lines, or edit your $prefix/share/ompi/mpif77-wrapper-data.txt file (and mpif90-wrapper-data.txt file) to set the "compiler_flags" line to include -Wl,-commons,use_dylibs. For example: compiler_flags=-Wl,-commons,use_dylibs Woo hoo! On Nov 28, 2011, at 8:11 PM, Jeff Squyres wrote: > Unfortunately, this is a known issue. :-\ > > I have not found a reliable way to deduce that MPI_IN_PLACE has been passed > as the parameter to MPI_REDUCE (and friends) on OS X. There's something very > strange going on with regards to the Fortran compiler and common block > variables (which is where we have MPI_IN_PLACE and other sentinel-value MPI > constants defined). > > We have a very old ticket open on this issue: > > https://svn.open-mpi.org/trac/ompi/ticket/1982 > > Any suggestions would be welcome. :-\ > > > On Nov 23, 2011, at 1:20 PM, Arjen van Elteren wrote: > >> Dear All, >> >> I'm running a complex program with a number of MPI_REDUCE calls, every call >> uses MPI_IN_PLACE as the first parameter (the send buffer). >> >> I'm currently testing this program on Mac 10.6 with macports installed. >> >> Unfortunately all MPI_REDUCE calls with MPI_IN_PLACE, seem to fail. >> >> I've pinpointed the problem to the MPI_IN_PLACE parameter location, it seems >> to matter if it is the first or the second parameter to the MPI_REDUCE call. >> >> This is specific for fortran, in C the sequence does not matter! >> >> A simple program to test this: >> >> PROGRAM MAIN >> implicit none >> include 'mpif.h' >> integer :: x(10) >> integer :: provided,ioerror >> call MPI_INIT(ioerror) >> x = 1 >> >> print *, x >> call MPI_REDUCE(x, MPI_IN_PLACE,10, MPI_INTEGER, MPI_SUM, 0,MPI_COMM_WORLD, >> ioerror) >> print *, x >> call MPI_REDUCE(MPI_IN_PLACE, x,10, MPI_INTEGER, MPI_SUM, 0,MPI_COMM_WORLD, >> ioerror) >> print *, x >> >> call MPI_FINALIZE(ioerror) >> END PROGRAM >> >> I run this on one process (mpiexec ./a.out) >> >> I'm running with openmpi version 1.5.4 (macports) >> >> The openmpi is compiled with gfortran 4.4.6 >> >> Is this a bug in openmpi or is my understanding of MPI_REDUCE wrong? >> >> Best regards, >> >> Arjen >> _______________________________________________ >> users mailing list >> us...@open-mpi.org >> http://www.open-mpi.org/mailman/listinfo.cgi/users > > > -- > Jeff Squyres > jsquy...@cisco.com > For corporate legal information go to: > http://www.cisco.com/web/about/doing_business/legal/cri/ > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users -- Jeff Squyres jsquy...@cisco.com For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
