X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/89e44dce958ad9625570b126f11d299b829d4932..48eccb2c1532e35819830ca56fad7cf89887359f:/src/smpi/colls/reduce-scatter-gather.c

diff --git a/src/smpi/colls/reduce-scatter-gather.c b/src/smpi/colls/reduce-scatter-gather.c
index fd1c5dccc9..98f2a097fa 100644
--- a/src/smpi/colls/reduce-scatter-gather.c
+++ b/src/smpi/colls/reduce-scatter-gather.c
@@ -1,3 +1,9 @@
+/* Copyright (c) 2013-2014. The SimGrid Team.
+ * All rights reserved.                                                     */
+
+/* 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 "colls_private.h"
 
 /*
@@ -10,12 +16,12 @@ int smpi_coll_tuned_reduce_scatter_gather(void *sendbuf, void *recvbuf,
                                           MPI_Op op, int root, MPI_Comm comm)
 {
   MPI_Status status;
-  int comm_size, rank, type_size, pof2, rem, newrank;
+  int comm_size, rank, pof2, rem, newrank;
   int mask, *cnts, *disps, i, j, send_idx = 0;
   int recv_idx, last_idx = 0, newdst;
   int dst, send_cnt, recv_cnt, newroot, newdst_tree_root;
   int newroot_tree_root, new_count;
-  int tag = 4321;
+  int tag = COLL_TAG_REDUCE,temporary_buffer=0;
   void *send_ptr, *recv_ptr, *tmp_buf;
 
   cnts = NULL;
@@ -27,10 +33,16 @@ int smpi_coll_tuned_reduce_scatter_gather(void *sendbuf, void *recvbuf,
     return 0;
   rank = smpi_comm_rank(comm);
   comm_size = smpi_comm_size(comm);
+  
 
-  extent = smpi_datatype_get_extent(datatype);
-  type_size = smpi_datatype_size(datatype);
 
+  extent = smpi_datatype_get_extent(datatype);
+  /* If I'm not the root, then my recvbuf may not be valid, therefore
+  I have to allocate a temporary one */
+  if (rank != root && !recvbuf) {
+    temporary_buffer=1;
+    recvbuf = (void *)smpi_get_tmp_recvbuffer(count * extent);
+  }
   /* find nearest power-of-two less than or equal to comm_size */
   pof2 = 1;
   while (pof2 <= comm_size)
@@ -39,10 +51,10 @@ int smpi_coll_tuned_reduce_scatter_gather(void *sendbuf, void *recvbuf,
 
   if (count < comm_size) {
     new_count = comm_size;
-    send_ptr = (void *) xbt_malloc(new_count * extent);
-    recv_ptr = (void *) xbt_malloc(new_count * extent);
-    tmp_buf = (void *) xbt_malloc(new_count * extent);
-    memcpy(send_ptr, sendbuf, extent * new_count);
+    send_ptr = (void *) smpi_get_tmp_sendbuffer(new_count * extent);
+    recv_ptr = (void *) smpi_get_tmp_recvbuffer(new_count * extent);
+    tmp_buf = (void *) smpi_get_tmp_sendbuffer(new_count * extent);
+    memcpy(send_ptr, sendbuf, extent * count);
 
     //if ((rank != root))
     smpi_mpi_sendrecv(send_ptr, new_count, datatype, rank, tag,
@@ -212,13 +224,13 @@ int smpi_coll_tuned_reduce_scatter_gather(void *sendbuf, void *recvbuf,
       }
     }
     memcpy(recvbuf, recv_ptr, extent * count);
-    free(send_ptr);
-    free(recv_ptr);
+    smpi_free_tmp_buffer(send_ptr);
+    smpi_free_tmp_buffer(recv_ptr);
   }
 
 
-  else if (count >= comm_size) {
-    tmp_buf = (void *) xbt_malloc(count * extent);
+  else /* (count >= comm_size) */ {
+    tmp_buf = (void *) smpi_get_tmp_sendbuffer(count * extent);
 
     //if ((rank != root))
     smpi_mpi_sendrecv(sendbuf, count, datatype, rank, tag,
@@ -388,6 +400,9 @@ int smpi_coll_tuned_reduce_scatter_gather(void *sendbuf, void *recvbuf,
       }
     }
   }
+  if (tmp_buf)
+    smpi_free_tmp_buffer(tmp_buf);
+  if(temporary_buffer==1) smpi_free_tmp_buffer(recvbuf);
   if (cnts)
     free(cnts);
   if (disps)