/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
+#include <stdlib.h>
+
#include "private.h"
+#include "smpi_mpi_dt_private.h"
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_comm, smpi,
"Logging specific to SMPI (comm)");
typedef struct s_smpi_mpi_communicator {
MPI_Group group;
+ int refcount;
} s_smpi_mpi_communicator_t;
-MPI_Comm smpi_comm_new(MPI_Group group) {
+static int smpi_compare_rankmap(const void *a, const void *b)
+{
+ const int* x = (const int*)a;
+ const int* y = (const int*)b;
+
+ if (x[1] < y[1]) {
+ return -1;
+ }
+ if (x[1] == y[1]) {
+ if (x[0] < y[0]) {
+ return -1;
+ }
+ if (x[0] == y[0]) {
+ return 0;
+ }
+ return 1;
+ }
+ return 1;
+}
+
+MPI_Comm smpi_comm_new(MPI_Group group)
+{
MPI_Comm comm;
comm = xbt_new(s_smpi_mpi_communicator_t, 1);
comm->group = group;
smpi_group_use(comm->group);
+ smpi_comm_use(comm);
return comm;
}
-void smpi_comm_destroy(MPI_Comm comm) {
- smpi_group_destroy(comm->group);
- xbt_free(comm);
+void smpi_comm_destroy(MPI_Comm comm)
+{
+ smpi_group_unuse(comm->group);
+ smpi_comm_unuse(comm);
}
-MPI_Group smpi_comm_group(MPI_Comm comm) {
+MPI_Group smpi_comm_group(MPI_Comm comm)
+{
return comm->group;
}
-int smpi_comm_size(MPI_Comm comm) {
+int smpi_comm_size(MPI_Comm comm)
+{
return smpi_group_size(smpi_comm_group(comm));
}
-int smpi_comm_rank(MPI_Comm comm) {
+int smpi_comm_rank(MPI_Comm comm)
+{
return smpi_group_rank(smpi_comm_group(comm), smpi_process_index());
}
+
+void smpi_comm_get_name (MPI_Comm comm, char* name, int* len)
+{
+ if(comm == MPI_COMM_WORLD) {
+ strcpy(name, "WORLD");
+ *len = 5;
+ } else {
+ *len = snprintf(name, MPI_MAX_NAME_STRING, "%p", comm);
+ }
+}
+
+MPI_Comm smpi_comm_split(MPI_Comm comm, int color, int key)
+{
+ int system_tag = 123;
+ int index, rank, size, i, j, count, reqs;
+ int* sendbuf;
+ int* recvbuf;
+ int* rankmap;
+ MPI_Group group, group_root, group_out;
+ MPI_Request* requests;
+
+ group_root = group_out = NULL;
+ group = smpi_comm_group(comm);
+ rank = smpi_comm_rank(comm);
+ size = smpi_comm_size(comm);
+ /* Gather all colors and keys on rank 0 */
+ sendbuf = xbt_new(int, 2);
+ sendbuf[0] = color;
+ sendbuf[1] = key;
+ if(rank == 0) {
+ recvbuf = xbt_new(int, 2 * size);
+ } else {
+ recvbuf = NULL;
+ }
+ smpi_mpi_gather(sendbuf, 2, MPI_INT, recvbuf, 2, MPI_INT, 0, comm);
+ xbt_free(sendbuf);
+ /* Do the actual job */
+ if(rank == 0) {
+ rankmap = xbt_new(int, 2 * size);
+ for(i = 0; i < size; i++) {
+ if(recvbuf[2 * i] == MPI_UNDEFINED) {
+ continue;
+ }
+ count = 0;
+ for(j = i + 1; j < size; j++) {
+ if(recvbuf[2 * i] == recvbuf[2 * j]) {
+ recvbuf[2 * j] = MPI_UNDEFINED;
+ rankmap[2 * count] = j;
+ rankmap[2 * count + 1] = recvbuf[2 * j + 1];
+ count++;
+ }
+ }
+ /* Add self in the group */
+ recvbuf[2 * i] = MPI_UNDEFINED;
+ rankmap[2 * count] = i;
+ rankmap[2 * count + 1] = recvbuf[2 * i + 1];
+ count++;
+ qsort(rankmap, count, 2 * sizeof(int), &smpi_compare_rankmap);
+ group_out = smpi_group_new(count);
+ if(i == 0) {
+ group_root = group_out; /* Save root's group */
+ }
+ for(j = 0; j < count; j++) {
+ index = smpi_group_index(group, rankmap[2 * j]);
+ smpi_group_set_mapping(group_out, index, j);
+ }
+ requests = xbt_new(MPI_Request, count);
+ reqs = 0;
+ for(j = 0; j < count; j++) {
+ if(rankmap[2 * j] != 0) {
+ requests[reqs] = smpi_isend_init(&group_out, 1, MPI_PTR, rankmap[2 * j], system_tag, comm);
+ reqs++;
+ }
+ }
+ smpi_mpi_startall(reqs, requests);
+ smpi_mpi_waitall(reqs, requests, MPI_STATUS_IGNORE);
+ xbt_free(requests);
+ }
+ xbt_free(recvbuf);
+ group_out = group_root; /* exit with root's group */
+ } else {
+ if(color != MPI_UNDEFINED) {
+ smpi_mpi_recv(&group_out, 1, MPI_PTR, 0, system_tag, comm, MPI_STATUS_IGNORE);
+ } /* otherwise, exit with group_out == NULL */
+ }
+ if(group_out)smpi_group_use(group_out);
+ return group_out ? smpi_comm_new(group_out) : MPI_COMM_NULL;
+}
+
+void smpi_comm_use(MPI_Comm comm){
+ comm->refcount++;
+ smpi_group_use(comm->group);
+}
+
+void smpi_comm_unuse(MPI_Comm comm){
+ comm->refcount--;
+ smpi_group_unuse(comm->group);
+ if(comm->refcount==0)
+ xbt_free(comm);
+}
