TESTMPIRUN add option --oversubscribe when using OpenMPI

Author: wkliao

.github/workflows/mac_openmpi.yml

@@ -118,7 +118,6 @@ jobs:
                         --with-pthread \
                         --disable-fortran \
                         --with-mpi=${GITHUB_WORKSPACE}/OPENMPI \
-                        TESTMPIRUN="${GITHUB_WORKSPACE}/OPENMPI/bin/mpiexec --oversubscribe -n NP" \
                         TESTOUTDIR=${GITHUB_WORKSPACE}/pnetcdf_output
             make -j 8 tests
         - name: Print config.log

.github/workflows/ubuntu_openmpi.yml

@@ -124,7 +124,6 @@ jobs:
                         --enable-thread-safe \
                         --with-pthread \
                         --with-mpi=${GITHUB_WORKSPACE}/OPENMPI \
-                        TESTMPIRUN="${GITHUB_WORKSPACE}/OPENMPI/bin/mpiexec --oversubscribe -n NP" \
                         TESTOUTDIR=${GITHUB_WORKSPACE}/pnetcdf_output
             make -j 8 tests
         - name: Print config.log

configure.ac

@@ -2538,6 +2538,9 @@ if test "x${TESTMPIRUN}" = x ; then
    dnl set default to "mpiexec -n NP"
    UD_MPI_PATH_PROGS([TESTMPIRUN], [mpiexec mpirun srun])
    if test "x${TESTMPIRUN}" != x ; then
+      if test "x${ax_cv_mpi_compiler_vendor}" = xOpenMPI ; then
+         TESTMPIRUN="$TESTMPIRUN --oversubscribe"
+      fi
       TESTMPIRUN="$TESTMPIRUN -n NP"
    fi
 fi