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gcc/V.R/openmpi

gcc/V.R/mvapich

intel/YY/openmpi4

intel/YY/mvapich

Where V.R is the version and release, like in

module load gcc/9.2/openmpi

You can also use gcc/V.R/openmpi-V.R.P, like in

module load gcc/9.2/openmpi-9.2.0

Where YY is the version (year), like in

module load intel/21/mvapich

You can also use intel/YY/mvapich-YY.R, like in

module load intel/21/mvapich-21.4

Do not use the MPI implementation distributed by Intel, as it fails to run on Hydra (IB incompatibility).

Hence do not try to use mpiicc, mpiicpc, mpiifort

/home/hpc/examples/mpi/openmpi/gcc

/home/hpc/examples/mpi/mvapich/gcc

/home/hpc/examples/mpi/openmpi4/intel

/home/hpc/examples/mpi/mvapchi/intel

pgi/YY/openmpi

pgi/YY/opnempi4

pgi/YY/mvapich

nvidia/YY/openmpi

nvidia/YY/opnempi4

nvidia/YY/mvapich

Where YY is the version (year), like in

module load pgi/19/mvapich

You can also use pgi/YY/mvapich-YY.R, like in

module load pgi/19/mvapich-19.9

Where YY is the version(year), like in

module load nvidia/21/mvapich

You can also use nvidia/YY/mvapich-YY.R, like in

module load nvidia/21/mvapich-21.9