- return 1;
-}
-
-// FIXME: needs to return null in event of MPI_UNDEFINED color...
-int SMPI_MPI_Comm_split(MPI_Comm comm, int color, int key, MPI_Comm *comm_out)
-{
- int retval = MPI_SUCCESS;
-
- int index, rank;
- smpi_mpi_request_t request;
- int colorkey[2];
- smpi_mpi_status_t status;
-
- smpi_bench_end();
-
- // FIXME: need to test parameters
-
- index = smpi_host_index();
- rank = comm->index_to_rank_map[index];
-
- if (0 == rank) {
- int colormap[comm->size];
- int keymap[comm->size];
- int rankkeymap[comm->size * 2];
- int i, j;
- smpi_mpi_communicator_t tempcomm = NULL;
- int colortmp;
- int keycount;
- int indextmp;
-
- colormap[0] = color;
- keymap[0] = key;
-
- // FIXME: use scatter/gather or similar instead of individual comms
- for (i = 1; i < comm->size; i++) {
- retval = smpi_create_request(colorkey, 2, MPI_INT, MPI_ANY_SOURCE,
- rank, MPI_ANY_TAG, comm, &request);
- smpi_mpi_irecv(request);
- smpi_mpi_wait(request, &status);
- colormap[status.MPI_SOURCE] = colorkey[0];
- keymap[status.MPI_SOURCE] = colorkey[1];
- xbt_mallocator_release(smpi_global->request_mallocator, request);
- }
-
- for (i = 0; i < comm->size; i++) {
- if (-1 == colormap[i]) {
- continue;
- }
- colortmp = colormap[i];
- keycount = 0;
- for (j = i; j < comm->size; j++) {
- if(colortmp == colormap[j]) {
- colormap[j] = -1;
- rankkeymap[keycount * 2] = j;
- rankkeymap[keycount * 2 + 1] = keymap[j];
- keycount++;
- }
- }
- qsort(rankkeymap, keycount, sizeof(int) * 2, &smpi_compare_rankkeys);
- tempcomm = xbt_new(s_smpi_mpi_communicator_t, 1);
- tempcomm->barrier_count = 0;
- tempcomm->size = keycount;
- tempcomm->barrier_mutex = SIMIX_mutex_init();
- tempcomm->barrier_cond = SIMIX_cond_init();
- tempcomm->rank_to_index_map = xbt_new(int, keycount);
- tempcomm->index_to_rank_map = xbt_new(int, smpi_global->host_count);
- for (j = 0; j < smpi_global->host_count; j++) {
- tempcomm->index_to_rank_map[j] = -1;
- }
- for (j = 0; j < keycount; j++) {
- indextmp = comm->rank_to_index_map[rankkeymap[j*2]];
- tempcomm->rank_to_index_map[j] = indextmp;
- tempcomm->index_to_rank_map[indextmp] = j;
- }
- for (j = 0; j < keycount; j++) {
- if (rankkeymap[j*2]) {
- retval = smpi_create_request(&j, 1, MPI_INT, 0,
- rankkeymap[j*2], 0, comm, &request);
- request->data = tempcomm;
- smpi_mpi_isend(request);
- smpi_mpi_wait(request, &status);
- xbt_mallocator_release(smpi_global->request_mallocator,
- request);
- } else {
- *comm_out = tempcomm;
- }
- }
- }
- } 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();
-
- return retval;