https://bugzilla.redhat.com/show_bug.cgi?id=1382755
--- Comment #21 from Antonio Trande <[email protected]> --- (In reply to Christoph Junghans from comment #20) > (In reply to Antonio Trande from comment #19) > > (In reply to Christoph Junghans from comment #18) > > > (In reply to Antonio Trande from comment #17) > > > > - MPI builds are not using MPI compilers: > > > > > > > > OpenMPI build must use mpic++ that's located in > > > > '/usr/lib64/openmpi/bin'. > > > > MPICH build must use mpic++ that's located in '/usr/lib64/mpich/bin'. > > > > > > > > Force CXX flags after %{_mpich_load} and %{_openmpi_load} with: > > > > > > > > export CXX=mpic++ > > > Legion doesn't actually depends on MPI and hence using mpic++ as a > > > compiler > > > might lead to overlinking. Legion only depends on Gasnet, which comes in > > > two > > > mpi variants. > > > The reason that legion looks for mpi can be found here: > > > <https://github.com/StanfordLegion/legion/pull/205> > > > And doesn't really apply on Fedora as we are using shared libs for gasnet. > > > > Let me understand, please: Legion does not depend on MPI but neither Gasnet > > looks linked to mpi, in fact Legion is inheriting all > > undefined-non-weak-symbol from Gasnet > > (https://bugzilla.redhat.com/show_bug.cgi?id=1375744#c9). > > I'm asking to myself why Legion-MPI libraries are compiled. > Yes, legion is using gasnet to do its communication, it doesn't use mpi > directly. > (mpi-devel is still a build requirement as otherwise the mpi module cannot > be loaded and $MPI_LIB is needed to find the right gasnet libraries.) > The gasnet libraries get linked against mpi here: > <http://pkgs.fedoraproject.org/cgit/rpms/gasnet.git/tree/gasnet.spec#n141> > and hence > $ module load mpi/openmpi-x86_64 > $ ldd /usr/lib64/openmpi/lib/libgasnet-mpi-par.so | grep libmpi.so > libmpi.so.12 => /usr/lib64/openmpi/lib/libmpi.so.12 (0x00007fe0bdbd9000) > Does that make sense? More or less. Legion uses MPI through gasnet. -- You are receiving this mail because: You are on the CC list for the bug. You are always notified about changes to this product and component _______________________________________________ package-review mailing list -- [email protected] To unsubscribe send an email to [email protected]
