Source: petsc4py Followup-For: Bug #972385 When the petsc4py tests fail, it seems to correlate with mpiexec -n 48 python3 test_mat_cg.py When the tests pass, they pass with mpiexec -n 2 python3 test_mat_cg.py Evidently the MPI tests are calling on the full number of available CPUs. The tests are not large enough to run successfully over 48 processes.
In that case we should be able to resolve the problem by constraining the number of processes used with mpiexec.
