+/* 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"
/*****************************************************************************
{
MPI_Aint extent;
- int i, src, dst, rank, num_procs;
- int tag = 1;
+ unsigned int i, src, dst;
+ int tag = COLL_TAG_ALLGATHER;
MPI_Status status;
char *send_ptr = (char *) send_buff;
char *recv_ptr = (char *) recv_buff;
- rank = smpi_comm_rank(comm);
- num_procs = smpi_comm_size(comm);
+ unsigned int rank = smpi_comm_rank(comm);
+ unsigned int num_procs = smpi_comm_size(comm);
+
+ if((num_procs&(num_procs-1)))
+ THROWF(arg_error,0, "allgather pair algorithm can't be used with non power of two number of processes ! ");
+
extent = smpi_datatype_get_extent(send_type);
// local send/recv