How to run compiled MPI function

Hi,

I did a simple MPI code and successfully compiled it by MEX. However, I do not know how to run it in MATLAB.

The name of the compiled file is called testMPI.mexa64, and I simply typed testMPI in MATLAB command window. It reported MPI_Init failed

Anyone can help on this?

#include "mex.h"
#include "math.h"
#include "stdio.h"
#include <mpi.h>

void mexFunction(
        int nargout,
        mxArray *pargout [ ],
        int nargin,
        const mxArray *pargin  [ ]
        ) {
    
    int comm_sz;
    int my_rank;
    int q = 0;
    MPI_Init(NULL, NULL);
    MPI_Comm_size(MPI_COMM_WORLD, &comm_sz);
    MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
    
    printf("Hello from processor %d\n",my_rank);
    
    
    MPI_Finalize();
    printf("Hello, world!\n");
    
}

[Amit P]

I have the same problem with Matlab crashing every second time I run my Mex program.

I took the Crash Dump from the failed job and found the following:

[1] [0] fatal error

[1] Fatal error in MPI_Init: Other MPI error, error stack:

[1] MPI_Init(argc_p=0x0000000000000000, argv_p=0x0000000000000000) failed

[1] Cannot call MPI_INIT or MPI_INIT_THREAD more than once

[Richard Hern]

I ran into the same problem. Has it been solved?@Yangyang Xu@Amit P