Add collectives for allgather, allreduce, bcast and reduce

[simgrid.git] / src / smpi / colls / alltoall-ring-light-barrier.c

diff --git a/src/smpi/colls/alltoall-ring-light-barrier.c b/src/smpi/colls/alltoall-ring-light-barrier.c
index 2508ed1..f901445 100644 (file)
--- a/src/smpi/colls/alltoall-ring-light-barrier.c
+++ b/src/smpi/colls/alltoall-ring-light-barrier.c
@@ -22,20 +22,21 @@
 
  ****************************************************************************/
 int
-smpi_coll_tuned_alltoall_ring_light_barrier(void * send_buff, int send_count,
-                           MPI_Datatype send_type, void * recv_buff,
-                           int recv_count, MPI_Datatype recv_type,
-                           MPI_Comm comm)
+smpi_coll_tuned_alltoall_ring_light_barrier(void *send_buff, int send_count,
+                                            MPI_Datatype send_type,
+                                            void *recv_buff, int recv_count,
+                                            MPI_Datatype recv_type,
+                                            MPI_Comm comm)
 {
   MPI_Aint send_chunk, recv_chunk;
   MPI_Status s;
   int i, src, dst, rank, num_procs, next_dst, next_src;
-  int tag = 1, success = 1; /*, failure = 0;*/
+  int tag = 1, success = 1;     /*, failure = 0; */
 
   char send_sync = 'a', recv_sync = 'b';
-  char * send_ptr = (char *) send_buff;
-  char * recv_ptr = (char *) recv_buff;
-  
+  char *send_ptr = (char *) send_buff;
+  char *recv_ptr = (char *) recv_buff;
+
   MPI_Comm_rank(comm, &rank);
   MPI_Comm_size(comm, &num_procs);
   MPI_Type_extent(send_type, &send_chunk);
@@ -45,28 +46,25 @@ smpi_coll_tuned_alltoall_ring_light_barrier(void * send_buff, int send_count,
   recv_chunk *= recv_count;
 
   MPI_Sendrecv(send_ptr + rank * send_chunk, send_count, send_type, rank, tag,
-              recv_ptr + rank * recv_chunk, recv_count, recv_type, rank, tag,
-              comm, &s);
+               recv_ptr + rank * recv_chunk, recv_count, recv_type, rank, tag,
+               comm, &s);
+
+  for (i = 1; i < num_procs; i++) {
+    src = (rank - i + num_procs) % num_procs;
+    dst = (rank + i) % num_procs;
+
+    MPI_Sendrecv(send_ptr + dst * send_chunk, send_count, send_type,
+                 dst, tag, recv_ptr + src * recv_chunk, recv_count,
+                 recv_type, src, tag, comm, &s);
 
-  for (i = 1; i < num_procs; i++)
-    {
-      src = (rank - i + num_procs) % num_procs;
-      dst = (rank + i) % num_procs;
-      
-      MPI_Sendrecv(send_ptr + dst * send_chunk, send_count, send_type,
-                  dst, tag, recv_ptr + src * recv_chunk, recv_count,
-                  recv_type, src, tag, comm, &s);
+    if ((i + 1) < num_procs) {
+      next_src = (rank - (i + 1) + num_procs) % num_procs;
+      next_dst = (rank + (i + 1) + num_procs) % num_procs;
+      MPI_Sendrecv(&send_sync, 1, MPI_CHAR, next_src, tag,
+                   &recv_sync, 1, MPI_CHAR, next_dst, tag, comm, &s);
 
-      if ((i + 1) < num_procs)
-       {
-         next_src = (rank - (i + 1) + num_procs) % num_procs;
-         next_dst = (rank + (i + 1) + num_procs) % num_procs;
-         MPI_Sendrecv(&send_sync, 1, MPI_CHAR, next_src, tag,
-                      &recv_sync, 1, MPI_CHAR, next_dst, tag,
-                      comm, &s);
-         
-       }
     }
+  }
 
   return success;
 }