Re: [OMPI users] MPI_Reduce_Scatter Segmentation Fault with Intel 2019 Update 1 Compilers on OPA-1

On Mon, 3 Dec 2018 19:41:25 + "Hammond, Simon David via users" wrote: > Hi Open MPI Users, > > Just wanted to report a bug we have seen with OpenMPI 3.1.3 and 4.0.0 > when using the Intel 2019 Update 1 compilers on our > Skylake/OmniPath-1 cluster. The bug occurs when running the Github >

Re: [OMPI users] MPI_Reduce_Scatter Segmentation Fault with Intel 2019 Update 1 Compilers on OPA-1

On Tue, 4 Dec 2018 09:15:13 -0500 George Bosilca wrote: > I'm trying to replicate using the same compiler (icc 2019) on my OSX > over TCP and shared memory with no luck so far. So either the > segfault it's something specific to OmniPath or to the memcpy > implementation used on Skylake. Note

Re: [OMPI users] MPI_Reduce_Scatter Segmentation Fault with Intel 2019 Update 1 Compilers on OPA-1

I'm trying to replicate using the same compiler (icc 2019) on my OSX over TCP and shared memory with no luck so far. So either the segfault it's something specific to OmniPath or to the memcpy implementation used on Skylake. I tried to use the trace you sent, more specifically the

Re: [OMPI users] filesystem-dependent failure building Fortran interfaces

Hi Dave; thanks for reporting. Yes, we've fixed this -- it should be included in 4.0.1. https://github.com/open-mpi/ompi/pull/6121 If you care, you can try the nightly 4.0.x snapshot tarball -- it should include this fix: https://www.open-mpi.org/nightly/v4.0.x/ > On Dec 4, 2018,

[OMPI users] filesystem-dependent failure building Fortran interfaces

If you try to build somewhere out of tree, not in a subdir of the source, the Fortran build is likely to fail because mpi-ext-module.F90 does include '/openmpi-4.0.0/ompi/mpiext/pcollreq/mpif-h/mpiext_pcollreq_mpifh.h' and can exceed the fixed line length. It either needs to add (the

Re: [OMPI users] MPI_Reduce_Scatter Segmentation Fault with Intel 2019 Update 1 Compilers on OPA-1

Thanks for the report. As far as I am concerned, this is a bug in the IMB benchmark, and I issued a PR to fix that https://github.com/intel/mpi-benchmarks/pull/11 Meanwhile, you can manually download and apply the patch at https://github.com/intel/mpi-benchmarks/pull/11.patch Cheers,

Re: [OMPI users] MPI_Reduce_Scatter Segmentation Fault with Intel 2019 Update 1 Compilers on OPA-1

Hi, The memory manager of IMB (IMB_mem_manager.c) do not support the MPI_Reduce_scatter operation. It allocates too small send buffer: sizeof(msg), but the operation requires commsize * sizeof(msg). There are two possible solutions: 1) Fix computations of recvcounts (as proposed by Gilles)

Re: [OMPI users] MPI_Reduce_Scatter Segmentation Fault with Intel 2019 Update 1 Compilers on OPA-1

Thanks Mikhail, You have a good point. With the current semantic used in the IMB benchmark, this cannot be equivalent to MPI_Reduce() of N bytes followed by MPI_Scatterv() of N bytes. So this is indeed a semantical question : what should be a MPI_Reduce_scatter() of N bytes equivalent