#define MPI_ANY_TAG -1
+#define MPI_UNDEFINED -1
+
// errorcodes
#define MPI_SUCCESS 0
#define MPI_ERR_COMM 1
int MPI_Recv(void *buf, int count, MPI_Datatype datatype, int src, int tag, MPI_Comm comm, MPI_Status *status);
int MPI_Isend(void *buf, int count, MPI_Datatype datatype, int dst, int tag, MPI_Comm comm, MPI_Request *request);
int MPI_Send(void *buf, int count, MPI_Datatype datatype, int dst, int tag, MPI_Comm comm);
+int MPI_Comm_split(MPI_Comm comm, int color, int key, MPI_Comm *comm_out);
// smpi functions
XBT_IMPORT_NO_EXPORT(int) smpi_simulated_main(int argc, char **argv);
return retval;
}
+
+int 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 *colors = xbt_new(int, comm->size);
+ int *keys = xbt_new(int, comm->size);
+ int i, j, k;
+ smpi_mpi_communicator_t tempcomm = NULL;
+ int colortmp;
+ int keycount;
+ int *keystmp = xbt_new(int, comm->size);
+ int *rankstmp = xbt_new(int, comm->size);
+ int tmpval;
+ int indextmp;
+
+ colors[0] = color;
+ keys[0] = key;
+
+ // FIXME: not efficient
+ 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);
+ xbt_mallocator_release(smpi_global->request_mallocator, request);
+ colors[i] = colorkey[0];
+ keys[i] = colorkey[1];
+ }
+
+ for (i = 0; i < comm->size; i++) {
+ if (-1 == colors[i]) {
+ continue;
+ }
+ colortmp = colors[i];
+ keycount = 0;
+ for (j = i; j < comm->size; j++) {
+ if(colortmp == colors[j]) {
+ colors[j] = -1;
+ keystmp[keycount] = keys[j];
+ rankstmp[keycount] = j;
+ keycount++;
+ }
+ }
+ if (0 < keycount) {
+ // FIXME: yes, mock me, bubble sort...
+ for (j = 0; j < keycount; j++) {
+ for (k = keycount - 1; k > j; k--) {
+ if (keystmp[k] < keystmp[k - 1]) {
+ tmpval = keystmp[k];
+ keystmp[k] = keystmp[k - 1];
+ keystmp[k - 1] = tmpval;
+
+ tmpval = rankstmp[k];
+ rankstmp[k] = rankstmp[k - 1];
+ rankstmp[k - 1] = tmpval;
+ }
+ }
+ }
+ tempcomm = xbt_new(s_smpi_mpi_communicator_t, 1);
+ tempcomm->barrier_count = 0;
+ 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[rankstmp[j]];
+ tempcomm->rank_to_index_map[j] = indextmp;
+ tempcomm->index_to_rank_map[indextmp] = j;
+ }
+ // FIXME: now send new communicator to happy troops...
+ }
+ }
+
+ } 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);
+ }
+
+ smpi_bench_begin();
+
+ return retval;
+}