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ParallelMachine.hpp
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/*
//@HEADER
// ************************************************************************
//
// Kokkos v. 2.0
// Copyright (2014) Sandia Corporation
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact H. Carter Edwards (hcedwar@sandia.gov)
//
// ************************************************************************
//@HEADER
*/
#error "ParallelMachine"
#ifndef PARALLELMACHINE_HPP
#define PARALLELMACHINE_HPP
//------------------------------------------------------------------------
#include <iosfwd>
#include <Kokkos_Core.hpp>
//------------------------------------------------------------------------
#if defined( KOKKOS_HAVE_MPI )
#include <mpi.h>
#else
typedef int MPI_Comm ;
#endif
//------------------------------------------------------------------------
//------------------------------------------------------------------------
namespace Parallel {
/** \brief Hybrid parallel machine with MPI+Kokkos::Threads or MPI+Kokkos::Cuda.
*
* Initialization of MPI and Kokkos device has interdependencies which this
* class manages. The command line and environment variables are queried to initialize
* the Threads or Cuda device:
*
* 1) cuda : initializes Cuda device
* 2) host : initializes Threads device with all hwloc detected cores.
* 3) host #gang #worker : initializes Threads with specified
*/
class Machine {
private:
MPI_Comm m_mpi_comm ;
int m_mpi_size ;
int m_mpi_rank ;
unsigned m_mpi_gpu ;
unsigned m_gpu_arch ;
Machine();
Machine( const Machine & );
Machine & operator = ( const Machine & );
public:
/** \brief Coordinated initialize MPI, Cuda, or Threads devices from 'main'. */
Machine( int * argc , char *** argv );
~Machine();
MPI_Comm mpi_comm() const { return m_mpi_comm ; }
int mpi_size() const { return m_mpi_size ; }
int mpi_rank() const { return m_mpi_rank ; }
/** \brief If using MPI that can directly operate on GPU memory */
bool mpi_gpu() const { return m_mpi_gpu ; }
/** \brief If using GPU then what architecture */
unsigned gpu_arch() const { return m_gpu_arch ; }
void print_configuration( std::ostream & ) const ;
};
}
//------------------------------------------------------------------------
#endif /* #ifndef PARALLELMACHINE_HPP */

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