mpi运行

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brew install openmpi
export OMPI_CXX=g++-7
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mpic++ helloworld.cpp -o helloworld.out
mpirun -n 2 ./helloworld.out
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#include <cstdio>
#include <mpi.h>

int main (int argc, char **argv)
{
  int rank, size;

  MPI_Init (&argc, &argv);  /* starts MPI */

  MPI_Comm_rank (MPI_COMM_WORLD, &rank);    /* get current process id */
  MPI_Comm_size (MPI_COMM_WORLD, &size);    /* get number of processes */

  printf( "Hello world from process %d of %d\n", rank, size );

  MPI_Finalize();

  return 0;
}
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