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c++xcode7openmp

increasing number of threads in openmp in xcode

I followed the instructions from this answer in clang-omp in Xcode under El Capitan

I was able to run openmp programs on xcode. But there was only 1 thread.

Also, I am able to run from terminal, refer to my answer for this Installing OpenMP on Mac OS X 10.11

how to increase no. of threads in xcode?

I am running sample program:

    #include <omp.h>
    #include <stdio.h>
    int main() {
    #pragma omp parallel
    printf("Hello from thread %d, nthreads %d\n", omp_get_thread_num(), omp_get_num_threads());
    }

I get only one thread in output in xcode.

I have tried Xcode->Edit Schemes-> Arguments-> Env variables-> OMP_NUM_THREADS with value 4

I have also tried omp_set_num_threads(4)

Solution

  • I am sure this answer is coming way too late. But hopefully might help someone else. I was struggling with the same issue and solved it by : Adding -fopenmp to Other C++ flags as well as C flags.

    Hope this helps someone.