Mex OpenMP C code

Question

Yangyang Xu 2019-1-22

0
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https://ww2.mathworks.cn/matlabcentral/answers/440946-mex-openmp-c-code

编辑： sjhstone 2020-8-19

在 MATLAB Online 中打开

Hi,

I tried to use OpenMP in Matlab 2018a. My code is very simple, called testOpenMP.c.

I successfully compiled the code by mex -v testOpenMP.c CFLAGS="$CFLAGS -fopenmp" LDFLAGS="$LDFLAGS -fopenmp"

However, we I run the compile mex extension by just typing testOpenMP in Matlab's command window. It always crashed.

Do you know how to correctly compile such an openmp c code and run it?

Thanks,

#include "mex.h"
#include "math.h"
#include "stdio.h"
#include <omp.h>
void mexFunction(
        int nargout,
        mxArray *pargout [ ],
        int nargin,
        const mxArray *pargin  [ ]
        ) {
    
    int thread_count = 32;
#pragma omp parallel for default(none)
for(int i = 0; i < 32; i++)
{
    printf("Hello from %d\n",i);
}
}

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Yangyang Xu 2019-1-22

It will not happen if I omit the #pragma line.

I used gcc 6.5

Sushant Mahajan 2019-5-4

Did you find any solution? I am facing the exact same issue with a FORTRAN subroutine using MEX configured with a gfortran-6 compiler.

It runs fine when it is compiled without the -fopenmp flag, but MATLAB shuts down when the subroutine is called after using the -fopenmp flag during compilation. This happens even if I do not use any OMP_PARALLEL (equivalent to C's #pragma omp parallel) construct in the code.

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