X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/3d25ce2fc68666d4b674c4f710cde362aa584632..d53d00d608a60a6f05e77ea7b7cd5c4e544d7ab1:/src/smpi/colls/bcast-flattree-pipeline.cpp

diff --git a/src/smpi/colls/bcast-flattree-pipeline.cpp b/src/smpi/colls/bcast-flattree-pipeline.cpp
new file mode 100644
index 0000000000..9b94eb214e
--- /dev/null
+++ b/src/smpi/colls/bcast-flattree-pipeline.cpp
@@ -0,0 +1,63 @@
+/* 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"
+
+int flattree_segment_in_byte = 8192;
+
+int
+smpi_coll_tuned_bcast_flattree_pipeline(void *buff, int count,
+                                        MPI_Datatype data_type, int root,
+                                        MPI_Comm comm)
+{
+  int i, j, rank, num_procs;
+  int tag = COLL_TAG_BCAST;
+
+  MPI_Aint extent;
+  extent = smpi_datatype_get_extent(data_type);
+
+  int segment = flattree_segment_in_byte / extent;
+  segment =  segment == 0 ? 1 :segment; 
+  int pipe_length = count / segment;
+  int increment = segment * extent;
+  if (pipe_length==0) {
+    XBT_WARN("MPI_bcast_flattree_pipeline use default MPI_bcast_flattree.");
+    return smpi_coll_tuned_bcast_flattree(buff, count, data_type, root, comm);
+  }
+  rank = smpi_comm_rank(comm);
+  num_procs = smpi_comm_size(comm);
+
+  MPI_Request *request_array;
+  MPI_Status *status_array;
+
+  request_array = (MPI_Request *) xbt_malloc(pipe_length * sizeof(MPI_Request));
+  status_array = (MPI_Status *) xbt_malloc(pipe_length * sizeof(MPI_Status));
+
+  if (rank != root) {
+    for (i = 0; i < pipe_length; i++) {
+      request_array[i] = smpi_mpi_irecv((char *)buff + (i * increment), segment, data_type, root, tag, comm);
+    }
+    smpi_mpi_waitall(pipe_length, request_array, status_array);
+  }
+
+  else {
+    // Root sends data to all others
+    for (j = 0; j < num_procs; j++) {
+      if (j == rank)
+        continue;
+      else {
+        for (i = 0; i < pipe_length; i++) {
+          smpi_mpi_send((char *)buff + (i * increment), segment, data_type, j, tag, comm);
+        }
+      }
+    }
+
+  }
+
+  free(request_array);
+  free(status_array);
+  return MPI_SUCCESS;
+}