About:

Dockerfile for run MPI programs

Setup:

Create the image:
- docker build -t="mpi" .
Run the image:
- docker run --name mpi -itd mpi

Develop:

Start the container:
- docker exec -it mpi bash

Write your code:

Example: mpi_hello.c:

 /* C Example */
 #include <mpi.h>
 #include <stdio.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;

 }
 ``

Compile:
- mpicc mpi_hello.c -o hello

Run:

mpirun -np 2 ./hello

Output of example:

  Hello world from process 0 of 2
  Hello world from process 1 of 2
 ``