mpi_manager_impl.h

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/*
 *  mpi_manager_impl.h
 *
 *  This file is part of NEST.
 *
 *  Copyright (C) 2004 The NEST Initiative
 *
 *  NEST is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  NEST is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with NEST.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
 
#ifndef MPI_MANAGER_IMPL_H
#define MPI_MANAGER_IMPL_H
 
#include "config.h"
 
#ifdef HAVE_MPI
// C includes:
#include <mpi.h>
#endif /* #ifdef HAVE_MPI */
 
#include "mpi_manager.h"
 
// Includes from nestkernel:
#include "kernel_manager.h"
 
namespace nest
{
 
inline size_t
MPIManager::get_process_id_of_vp( const size_t vp ) const
{
  return vp % num_processes_;
}
 
#ifdef HAVE_MPI
 
// Variable to hold the MPI communicator to use.
extern MPI_Comm comm;
 
template < typename T >
struct MPI_Type
{
  static MPI_Datatype type;
};
 
template < typename T >
void
MPIManager::communicate_Allgatherv( std::vector< T >& send_buffer,
  std::vector< T >& recv_buffer,
  std::vector< int >& displacements,
  std::vector< int >& recv_counts )
{
  // attempt Allgather
  MPI_Allgatherv( &( *send_buffer.begin() ),
    send_buffer.size(),
    MPI_Type< T >::type,
    &recv_buffer[ 0 ],
    &recv_counts[ 0 ],
    &displacements[ 0 ],
    MPI_Type< T >::type,
    comm );
}
 
inline size_t
MPIManager::get_process_id_of_node_id( const size_t node_id ) const
{
  return node_id % kernel().vp_manager.get_num_virtual_processes() % num_processes_;
}
 
#else  // HAVE_MPI
 
 
inline size_t
MPIManager::get_process_id_of_node_id( const size_t ) const
{
  return 0;
}
 
#endif /* HAVE_MPI */
 
}  // namespace nest
 
#endif /* MPI_MANAGER_IMPL_H */