--- /dev/null
+#include <stdio.h>
+#include <mpi.h>
+
+int main(int argc, char *argv[]) {
+ int worldrank, localrank;
+ MPI_Comm localcomm;
+ MPI_Init(&argc, &argv);
+ MPI_Comm_rank(MPI_COMM_WORLD, &worldrank);
+ MPI_Comm_split(MPI_COMM_WORLD, worldrank % 2, worldrank, &localcomm);
+ MPI_Comm_rank(localcomm, &localrank);
+ printf("node with world rank %d has local rank %d\n", worldrank, localrank);
+ MPI_Finalize();
+ return 0;
+}
return retval;
}
+// FIXME: needs to return null in event of MPI_UNDEFINED color...
int MPI_Comm_split(MPI_Comm comm, int color, int key, MPI_Comm *comm_out)
{
int retval = MPI_SUCCESS;
rank = comm->index_to_rank_map[index];
if (0 == rank) {
-
int *colors = xbt_new(int, comm->size);
int *keys = xbt_new(int, comm->size);
int i, j, k;
tempcomm->rank_to_index_map[j] = indextmp;
tempcomm->index_to_rank_map[indextmp] = j;
}
- // FIXME: now send new communicator to happy troops...
+ for (j = 0; j < keycount; j++) {
+ retval = smpi_create_request(&j, 1, MPI_INT, 0, rankstmp[j], 0, comm, &request);
+ request->data = tempcomm;
+ smpi_mpi_isend(request);
+ smpi_mpi_wait(request, &status);
+ xbt_mallocator_release(smpi_global->request_mallocator, request);
+ }
}
}
-
} else {
-
colorkey[0] = color;
colorkey[1] = key;
retval = smpi_create_request(colorkey, 2, MPI_INT, rank, 0, 0, comm, &request);
smpi_mpi_isend(request);
smpi_mpi_wait(request, &status);
xbt_mallocator_release(smpi_global->request_mallocator, request);
+ retval = smpi_create_request(colorkey, 1, MPI_INT, 0, rank, 0, comm, &request);
+ smpi_mpi_irecv(request);
+ smpi_mpi_wait(request, &status);
+ comm_out = request->data;
}
smpi_bench_begin();