X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/8a9af89e44c0f7f2f648d402e89a26799910ee31..40616078da72e823931c1fb884949054699ec39d:/src/smpi/colls/alltoallv/alltoallv-ring-one-barrier.cpp

diff --git a/src/smpi/colls/alltoallv/alltoallv-ring-one-barrier.cpp b/src/smpi/colls/alltoallv/alltoallv-ring-one-barrier.cpp
new file mode 100644
index 0000000000..1bb68f7fe1
--- /dev/null
+++ b/src/smpi/colls/alltoallv/alltoallv-ring-one-barrier.cpp
@@ -0,0 +1,57 @@
+/* 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"
+/*****************************************************************************
+
+ * Function: alltoall_ring
+
+ * Return: int
+
+ * Inputs:
+    send_buff: send input buffer
+    send_count: number of elements to send
+    send_type: data type of elements being sent
+    recv_buff: receive output buffer
+    recv_count: number of elements to received
+    recv_type: data type of elements being received
+    comm: communicator
+
+ * Descrp: Function works in P - 1 steps. In step i, node j - i -> j -> j + i.
+
+ * Auther: Ahmad Faraj
+
+ ****************************************************************************/
+int
+smpi_coll_tuned_alltoallv_ring_one_barrier(void *send_buff, int *send_counts, int *send_disps,
+                                          MPI_Datatype send_type,
+                                          void *recv_buff, int *recv_counts, int *recv_disps,
+                                          MPI_Datatype recv_type, MPI_Comm comm)
+{
+  MPI_Status s;
+  MPI_Aint send_chunk, recv_chunk;
+  int i, src, dst, rank, num_procs;
+  int tag = COLL_TAG_ALLTOALLV;
+
+  char *send_ptr = (char *) send_buff;
+  char *recv_ptr = (char *) recv_buff;
+
+  rank = comm->rank();
+  num_procs = comm->size();
+  send_chunk = send_type->get_extent();
+  recv_chunk = recv_type->get_extent();
+
+  smpi_mpi_barrier(comm);
+  for (i = 0; i < num_procs; i++) {
+    src = (rank - i + num_procs) % num_procs;
+    dst = (rank + i) % num_procs;
+
+    Request::sendrecv(send_ptr + send_disps[dst] * send_chunk, send_counts[dst], send_type, dst,
+                 tag, recv_ptr + recv_disps[src] * recv_chunk, recv_counts[src], recv_type,
+                 src, tag, comm, &s);
+  }
+  return MPI_SUCCESS;
+}