How to run compiled MPI function

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Yangyang Xu 2019-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/442813-how-to-run-compiled-mpi-function

评论： Richard Hern 2022-12-10

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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");
    
}