#include <mpi.h>
#include <omp.h>
#define n 2
MPI_Comm split_comm[n];
int main()
{
MPI_Info info;
int i, provided;
char s[16];
MPI_Init_thread(NULL, NULL, MPI_THREAD_MULTIPLE, &provided);
MPI_Info_create(&info);
for (i = 0; i < n; i++) {
MPI_Comm_dup(MPI_COMM_WORLD, &split_comm[i]);
sprintf(s, "%d", i);
MPI_Info_set(info, "thread_id", s);
MPI_Comm_set_info(split_comm[i], info);
}
#pragma omp parallel num_threads(n)
{
#pragma omp task
{
int j = 1;
MPI_Allreduce(MPI_IN_PLACE, &j, 1, MPI_INT, MPI_SUM, split_comm[1]);
printf("OMP thread %d, logical thread %d: allreduce returned %d\n",
omp_get_thread_num(), 1, j);
}
#pragma omp task
{
int j = 0;
MPI_Allreduce(MPI_IN_PLACE, &j, 1, MPI_INT, MPI_SUM, split_comm[0]);
printf("OMP thread %d, logical thread %d: allreduce returned %d\n",
omp_get_thread_num(), 0, j);
}
}
MPI_Info_free(&info);
MPI_Finalize();
}

See Also

thread_split_omp_for.c

thread_split_pthreads.c

Threading Runtimes Support

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