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https://github.com/paboyle/Grid.git
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86 lines
2.8 KiB
C++
86 lines
2.8 KiB
C++
#ifndef GRID_COMMUNICATOR_H
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#define GRID_COMMUNICATOR_H
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///////////////////////////////////
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// Processor layout information
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///////////////////////////////////
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#ifdef GRID_COMMS_MPI
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#include <mpi.h>
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#endif
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namespace Grid {
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class CartesianCommunicator {
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public:
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// Communicator should know nothing of the physics grid, only processor grid.
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int _Nprocessors; // How many in all
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std::vector<int> _processors; // Which dimensions get relayed out over processors lanes.
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int _processor; // linear processor rank
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std::vector<int> _processor_coor; // linear processor coordinate
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unsigned long _ndimension;
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#ifdef GRID_COMMS_MPI
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MPI_Comm communicator;
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#endif
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// Constructor
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CartesianCommunicator(std::vector<int> &pdimensions_in);
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// Wraps MPI_Cart routines
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void ShiftedRanks(int dim,int shift,int & source, int & dest);
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int RankFromProcessorCoor(std::vector<int> &coor);
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void ProcessorCoorFromRank(int rank,std::vector<int> &coor);
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/////////////////////////////////
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// Grid information queries
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/////////////////////////////////
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int IsBoss(void) { return _processor==0; };
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int ThisRank(void) { return _processor; };
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const std::vector<int> & ThisProcessorCoor(void) { return _processor_coor; };
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const std::vector<int> & ProcessorGrid(void) { return _processors; };
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int ProcessorCount(void) { return _Nprocessors; };
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////////////////////////////////////////////////////////////
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// Reduction
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////////////////////////////////////////////////////////////
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void GlobalSum(float &);
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void GlobalSumVector(float *,int N);
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void GlobalSum(double &);
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void GlobalSumVector(double *,int N);
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template<class obj> void GlobalSumObj(obj &o){
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typedef typename obj::scalar_type scalar_type;
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int words = sizeof(obj)/sizeof(scalar_type);
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scalar_type * ptr = (scalar_type *)& o;
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GlobalSum(ptr,words);
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}
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////////////////////////////////////////////////////////////
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// Face exchange
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////////////////////////////////////////////////////////////
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void SendToRecvFrom(void *xmit,
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int xmit_to_rank,
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void *recv,
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int recv_from_rank,
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int bytes);
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////////////////////////////////////////////////////////////
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// Barrier
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////////////////////////////////////////////////////////////
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void Barrier(void);
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////////////////////////////////////////////////////////////
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// Broadcast a buffer and composite larger
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////////////////////////////////////////////////////////////
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void Broadcast(int root,void* data, int bytes);
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template<class obj> void Broadcast(int root,obj &data)
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{
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Broadcast(root,(void *)&data,sizeof(data));
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};
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};
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}
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#endif
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