Oh, I should clarify: that MPIX_Query_cuda_support() function is always present in Open MPI -- even if you don't compile with CUDA support.
That's kinda the point / it's probably obvious, but I thought I would clarify, anyway. :-) > On Oct 30, 2018, at 4:29 PM, Akshay Venkatesh <akshay.v.3...@gmail.com> wrote: > > +1 to what Jeff said. > > So you would need --with-cuda pointing to a cuda installation to have > cuda-awareness in OpenMPI. > > On Tue, Oct 30, 2018 at 12:47 PM Jeff Squyres (jsquyres) via users > <users@lists.open-mpi.org> wrote: > The "Configure command line" shows you the command line that was given to > "configure" when building Open MPI. > > The "MPI extensions" line just indicates which Open MPI "extensions" were > built. > > CUDA is one of the possible extensions that can get built. > > The CUDA Open MPI extension is actually an API call that will tell you if > your Open MPI has CUDA support: > > https://www.open-mpi.org/doc/v3.1/man3/MPIX_Query_cuda_support.3.php > > > > > > On Oct 30, 2018, at 3:14 PM, Akshay Venkatesh <akshay.v.3...@gmail.com> > > wrote: > > > > The first one is the critical one. If the build was not configured > > --with-cuda, then it's unlikely cuda-aware MPI is supported. > > > > On Tue, Oct 30, 2018, 12:10 PM Andrei Berceanu <andreicberce...@gmail.com> > > wrote: > > Thanks! I tried both and > > ompi_info -a | grep "\-with\-cuda" returns nothing, while > > ompi_info -a | grep "xtensions" returns > > MPI extensions: affinity, cuda > > > > It seems the two outputs are in conflict, what does that mean? > > > > > > On Tue, Oct 30, 2018 at 8:50 PM Akshay Venkatesh <akshay.v.3...@gmail.com> > > wrote: > > Andrei, > > > > I generally check with one of these two: > > > > $ ompi_info -a | grep "\-with\-cuda" > > Configure command line: '--prefix=$HOME/ompi/build-cuda' > > '--enable-mpirun-prefix-by-default' '--with-cuda=/usr/local/cuda' > > '--with-ucx=$HOME/ucx-github/build' > > '--with-ucx-libdir=$HOME/ucx-github/build/lib' '--enable-debug' > > '--enable-mem-debug' '--enable-mpi-fortran=no' '--disable-oshmem' > > '--enable-install-libpmix' '--with-ompi-pmix-rte' > > > > $ ompi_info -a | grep "xtensions" > > MPI extensions: affinity, cuda, pcollreq > > > > > > On Tue, Oct 30, 2018 at 11:40 AM Andrei Berceanu > > <andreicberce...@gmail.com> wrote: > > Hi all, > > > > I am using openmpi@3.1.2 on an Ubuntu@16.04.5 box, how can I check if it > > has CUDA support or not? > > > > Best, > > Andrei > > _______________________________________________ > > users mailing list > > users@lists.open-mpi.org > > https://lists.open-mpi.org/mailman/listinfo/users > > > > > > -- > > -Akshay > > NVIDIA > > _______________________________________________ > > users mailing list > > users@lists.open-mpi.org > > https://lists.open-mpi.org/mailman/listinfo/users > > _______________________________________________ > > users mailing list > > users@lists.open-mpi.org > > https://lists.open-mpi.org/mailman/listinfo/users > > _______________________________________________ > > users mailing list > > users@lists.open-mpi.org > > https://lists.open-mpi.org/mailman/listinfo/users > > > -- > Jeff Squyres > jsquy...@cisco.com > > _______________________________________________ > users mailing list > users@lists.open-mpi.org > https://lists.open-mpi.org/mailman/listinfo/users > > > -- > -Akshay > NVIDIA -- Jeff Squyres jsquy...@cisco.com _______________________________________________ users mailing list users@lists.open-mpi.org https://lists.open-mpi.org/mailman/listinfo/users
