ceph/src/boost/boost/numeric/odeint/external/mpi/mpi_nested_algebra.hpp

   1 /*
   2  [auto_generated]
   3  boost/numeric/odeint/external/mpi/mpi_nested_algebra.hpp
   4
   5  [begin_description]
   6  Nested parallelized algebra for MPI.
   7  [end_description]
   8
   9  Copyright 2013 Karsten Ahnert
  10  Copyright 2013 Mario Mulansky
  11  Copyright 2013 Pascal Germroth
  12
  13  Distributed under the Boost Software License, Version 1.0.
  14  (See accompanying file LICENSE_1_0.txt or
  15  copy at http://www.boost.org/LICENSE_1_0.txt)
  16  */
  17
  18
  19 #ifndef BOOST_NUMERIC_ODEINT_EXTERNAL_MPI_MPI_NESTED_ALGEBRA_HPP_INCLUDED
  20 #define BOOST_NUMERIC_ODEINT_EXTERNAL_MPI_MPI_NESTED_ALGEBRA_HPP_INCLUDED
  21
  22 #include <boost/numeric/odeint/algebra/norm_result_type.hpp>
  23 #include <boost/numeric/odeint/util/n_ary_helper.hpp>
  24
  25 namespace boost {
  26 namespace numeric {
  27 namespace odeint {
  28
  29 /** \brief MPI-parallelized algebra, wrapping another algebra.
  30  */
  31 template< class InnerAlgebra >
  32 struct mpi_nested_algebra
  33 {
  34
  35 // execute the InnerAlgebra on each node's local data.
  36 #define BOOST_ODEINT_GEN_BODY(n) \
  37     InnerAlgebra::for_each##n( \
  38         BOOST_PP_ENUM_BINARY_PARAMS(n, s, () BOOST_PP_INTERCEPT) , \
  39         op \
  40     );
  41 BOOST_ODEINT_GEN_FOR_EACH(BOOST_ODEINT_GEN_BODY)
  42 #undef BOOST_ODEINT_GEN_BODY
  43
  44
  45     template< class NestedState >
  46     static typename norm_result_type< typename NestedState::value_type >::type norm_inf( const NestedState &s )
  47     {
  48         typedef typename norm_result_type< typename NestedState::value_type >::type result_type;
  49         // local maximum
  50         result_type value = InnerAlgebra::norm_inf( s() );
  51         // global maximum
  52         return boost::mpi::all_reduce(s.world, value, boost::mpi::maximum<result_type>());
  53     }
  54
  55 };
  56
  57
  58 }
  59 }
  60 }
  61
  62 #endif