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-// Copyright (C) 2005-2006 Douglas Gregor <doug.gregor -at- gmail.com>
-// Copyright (C) 2004 The Trustees of Indiana University
-
-// Use, modification and distribution is subject to the Boost Software
-// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
-// http://www.boost.org/LICENSE_1_0.txt)
-
-// Authors: Douglas Gregor
-// Andrew Lumsdaine
-
-// Message Passing Interface 1.1 -- Section 4.9.1. Reduce
-#ifndef BOOST_MPI_ALL_REDUCE_HPP
-#define BOOST_MPI_ALL_REDUCE_HPP
-
-#include <vector>
-
-#include <boost/mpi/inplace.hpp>
-
-// All-reduce falls back to reduce() + broadcast() in some cases.
-#include <boost/mpi/collectives/broadcast.hpp>
-#include <boost/mpi/collectives/reduce.hpp>
-
-namespace boost { namespace mpi {
-namespace detail {
- /**********************************************************************
- * Simple reduction with MPI_Allreduce *
- **********************************************************************/
- // We are reducing for a type that has an associated MPI
- // datatype and operation, so we'll use MPI_Allreduce directly.
- template<typename T, typename Op>
- void
- all_reduce_impl(const communicator& comm, const T* in_values, int n,
- T* out_values, Op /*op*/, mpl::true_ /*is_mpi_op*/,
- mpl::true_ /*is_mpi_datatype*/)
- {
- BOOST_MPI_CHECK_RESULT(MPI_Allreduce,
- (const_cast<T*>(in_values), out_values, n,
- boost::mpi::get_mpi_datatype<T>(*in_values),
- (is_mpi_op<Op, T>::op()), comm));
- }
-
- /**********************************************************************
- * User-defined reduction with MPI_Allreduce *
- **********************************************************************/
- // We are reducing at the root for a type that has an associated MPI
- // datatype but with a custom operation. We'll use MPI_Reduce
- // directly, but we'll need to create an MPI_Op manually.
- template<typename T, typename Op>
- void
- all_reduce_impl(const communicator& comm, const T* in_values, int n,
- T* out_values, Op op, mpl::false_ /*is_mpi_op*/,
- mpl::true_ /*is_mpi_datatype*/)
- {
- user_op<Op, T> mpi_op(op);
- BOOST_MPI_CHECK_RESULT(MPI_Allreduce,
- (const_cast<T*>(in_values), out_values, n,
- boost::mpi::get_mpi_datatype<T>(*in_values),
- mpi_op.get_mpi_op(), comm));
- }
-
- /**********************************************************************
- * User-defined, tree-based reduction for non-MPI data types *
- **********************************************************************/
- // We are reducing at the root for a type that has no associated MPI
- // datatype and operation, so we'll use a simple tree-based
- // algorithm.
- template<typename T, typename Op>
- void
- all_reduce_impl(const communicator& comm, const T* in_values, int n,
- T* out_values, Op op, mpl::false_ /*is_mpi_op*/,
- mpl::false_ /*is_mpi_datatype*/)
- {
- if (in_values == MPI_IN_PLACE) {
- // if in_values matches the in place tag, then the output
- // buffer actually contains the input data.
- // But we can just go back to the out of place
- // implementation in this case.
- // it's not clear how/if we can avoid the copy.
- std::vector<T> tmp_in( out_values, out_values + n);
- reduce(comm, &(tmp_in[0]), n, out_values, op, 0);
- } else {
- reduce(comm, in_values, n, out_values, op, 0);
- }
- broadcast(comm, out_values, n, 0);
- }
-} // end namespace detail
-
-template<typename T, typename Op>
-inline void
-all_reduce(const communicator& comm, const T* in_values, int n, T* out_values,
- Op op)
-{
- detail::all_reduce_impl(comm, in_values, n, out_values, op,
- is_mpi_op<Op, T>(), is_mpi_datatype<T>());
-}
-
-template<typename T, typename Op>
-inline void
-all_reduce(const communicator& comm, inplace_t<T*> inout_values, int n, Op op)
-{
- all_reduce(comm, static_cast<const T*>(MPI_IN_PLACE), n, inout_values.buffer, op);
-}
-
-template<typename T, typename Op>
-inline void
-all_reduce(const communicator& comm, inplace_t<T> inout_values, Op op)
-{
- all_reduce(comm, static_cast<const T*>(MPI_IN_PLACE), 1, &(inout_values.buffer), op);
-}
-
-template<typename T, typename Op>
-inline void
-all_reduce(const communicator& comm, const T& in_value, T& out_value, Op op)
-{
- detail::all_reduce_impl(comm, &in_value, 1, &out_value, op,
- is_mpi_op<Op, T>(), is_mpi_datatype<T>());
-}
-
-template<typename T, typename Op>
-T all_reduce(const communicator& comm, const T& in_value, Op op)
-{
- T result;
- ::boost::mpi::all_reduce(comm, in_value, result, op);
- return result;
-}
-
-} } // end namespace boost::mpi
-
-#endif // BOOST_MPI_ALL_REDUCE_HPP