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Diffstat (limited to 'var')
| -rw-r--r-- | var/spack/repos/builtin/packages/petsc/package.py | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/var/spack/repos/builtin/packages/petsc/package.py b/var/spack/repos/builtin/packages/petsc/package.py index ba120aac8f..6ad968bbe4 100644 --- a/var/spack/repos/builtin/packages/petsc/package.py +++ b/var/spack/repos/builtin/packages/petsc/package.py @@ -296,6 +296,18 @@ class Petsc(Package): cc('ex50.c', '-I%s' % prefix.include, '-L%s' % prefix.lib, '-lpetsc', '-lm', '-o', 'ex50') run = Executable(join_path(spec['mpi'].prefix.bin, 'mpirun')) + # For Spectrum MPI, if -np is omitted, the default behavior is + # to assign one process per process slot, where the default + # process slot allocation is one per core. On systems with + # many cores, the number of processes can exceed the size of + # the grid specified when the testcase is run and the test case + # fails. Specify a small number of processes to prevent + # failure. + # For more information about Spectrum MPI invocation, see URL + # https://www.ibm.com/support/knowledgecenter/en/SSZTET_10.1.0/smpi02/smpi02_mpirun_options.html + if ('spectrum-mpi' in spec): + run.add_default_arg('-np') + run.add_default_arg('4') run('ex50', '-da_grid_x', '4', '-da_grid_y', '4') if 'superlu-dist' in spec: run('ex50', |