Message Passing Interface (MPI)

Start with a simple mpi program (mpi_hello.c):

#include <mpi.h>
#include <stdio.h>

int main(int argc, char** argv) {
  // Initialize the MPI environment
  MPI_Init(NULL, NULL);

  // Get the number of processes
  int world_size;
  MPI_Comm_size(MPI_COMM_WORLD, &world_size);

  // Get the rank of the process
  int world_rank;
  MPI_Comm_rank(MPI_COMM_WORLD, &world_rank);

  // Get the name of the processor
  char processor_name[MPI_MAX_PROCESSOR_NAME];
  int name_len;
  MPI_Get_processor_name(processor_name, &name_len);

  // Print off a hello world message
  printf("Hello world from processor %s, rank %d out of %d processors\n",
	 processor_name, world_rank, world_size);

  // Finalize the MPI environment.
  MPI_Finalize();
}

To compile,

To run interactively,

Note that, there are few mpi modules installed in the system. You can check with module available

Example of the submission script,

Example of the output,

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