PlayaMPIComm.hpp

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// @HEADER

// @HEADER

#ifndef PLAYA_MPICOMM_H
#define PLAYA_MPICOMM_H

#include "PlayaDefs.hpp"
#include "PlayaMPIOp.hpp"
#include "PlayaMPIDataType.hpp"
#include "Teuchos_ConfigDefs.hpp"
#include "Teuchos_Array.hpp"
#include "Teuchos_RCP.hpp"

#ifdef HAVE_MPI
#include "mpi.h"
#endif


namespace Playa
{


class MPIComm
{
public:

  MPIComm();

#ifdef HAVE_MPI
  MPIComm(MPI_Comm comm);
#endif

  static MPIComm& world();
  static MPIComm& self();

  int getRank() const {return myRank_;}

  int getNProc() const {return nProc_;}

  void synchronize() const ;



  void allToAll(void* sendBuf, int sendCount, const MPIDataType& sendType,
    void* recvBuf, int recvCount, 
    const MPIDataType& recvType) const ;

  void allToAllv(void* sendBuf, int* sendCount, int* sendDisplacements,
    const MPIDataType& sendType,
    void* recvBuf, int* recvCount,
    int* recvDisplacements,
    const MPIDataType& recvType) const ;

  void allReduce(void* input, void* result, int inputCount, 
    const MPIDataType& type,
    const MPIOp& op) const ;


  void gather(void* sendBuf, int sendCount, const MPIDataType& sendType,
    void* recvBuf, int recvCount, const MPIDataType& recvType,
    int root) const ;

  void gatherv(void* sendBuf, int sendCount, const MPIDataType& sendType,
    void* recvBuf, int* recvCount, int* displacements, 
    const MPIDataType& recvType, int root) const ;

  void allGather(void* sendBuf, int sendCount, 
    const MPIDataType& sendType,
    void* recvBuf, int recvCount, 
    const MPIDataType& recvType) const ;

  void allGatherv(void* sendBuf, int sendCount, 
    const MPIDataType& sendType,
    void* recvBuf, int* recvCount, int* recvDisplacements,
    const MPIDataType& recvType) const ;

  void bcast(void* msg, int length, 
    const MPIDataType& type, int src) const ;


#ifdef HAVE_MPI
  MPI_Comm getComm() const {return comm_;}
#endif

  

  // errCheck() checks the return value of an MPI call and throws
  // a ParallelException upon failure.
  static void errCheck(int errCode, const std::string& methodName);

private:
#ifdef HAVE_MPI
  MPI_Comm comm_;
#endif

  int nProc_;
  int myRank_;

  void init();

  int mpiIsRunning() const ;
};
}
#endif