Why OpenMP does not work in a CUDA code compiled in Matlab (as a MEX)?

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Moein Mozaffarzadeh
Moein Mozaffarzadeh on 20 Sep 2021
Edited: 俊凯 王 on 24 Sep 2021
Hi, I'm trying to use OpenMP in my CUDA code, compile and use it in Matlab. However, it does not work. Here is a simple example:
#include <cuda_runtime.h>
#include "device_launch_parameters.h"
#include <stdio.h>
#include "cuda.h"
#include "mex.h"
#include "omp.h"
void mexFunction(int nlhs, mxArray* plhs[],
int nrhs, const mxArray* prhs[])
{
#pragma omp parallel
{
int ID = omp_get_thread_num();
printf("Hello(%d)", ID);
printf("World(%d) \n", ID);
}
}
I use
mexcuda OpenMPTest.cu
to compile this code in Matlab. When i run this in Matlab, all I get is "Hello(0)World(0) ". So, something is wrong. Maybe the probem is with the way that I compile?!!! Please help.
Moein.
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Answers (1)

俊凯 王
俊凯 王 on 24 Sep 2021
Edited: 俊凯 王 on 24 Sep 2021
til now i can't find the corroect compile cmd to create a cu project with omp activited
but there are some other ways can handle this trouble,like me i just use omp to create binary tree in cpu,and i want to make this tree root(struct in C) accessible to cu project in matlab
in fact,use intptr_t which cast pointer into int, matlab can accept this int parameter ,next step,we use this int as a input for a matlab cu input parameter
all in all,pointer can be casted into a int parameter for matlab ,and matlab transfer this parameter to cu project , all the variable in CPP/C can sited as a pointer ,this method maybe useful
.cpp(mex64) pointer->int matlab int -> .cu(project) int->pointer

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