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https://github.com/paboyle/Grid.git
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106 lines
2.6 KiB
C++
106 lines
2.6 KiB
C++
#include "Grid.h"
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#include <mpi.h>
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namespace Grid {
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// Should error check all MPI calls.
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CartesianCommunicator::CartesianCommunicator(std::vector<int> &processors)
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{
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_ndimension = processors.size();
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std::vector<int> periodic(_ndimension,1);
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_Nprocessors=1;
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_processors = processors;
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_processor_coor.resize(_ndimension);
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MPI_Cart_create(MPI_COMM_WORLD, _ndimension,&_processors[0],&periodic[0],1,&communicator);
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MPI_Comm_rank(communicator,&_processor);
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MPI_Cart_coords(communicator,_processor,_ndimension,&_processor_coor[0]);
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for(int i=0;i<_ndimension;i++){
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_Nprocessors*=_processors[i];
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}
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int Size;
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MPI_Comm_size(communicator,&Size);
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assert(Size==_Nprocessors);
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}
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void CartesianCommunicator::GlobalSum(uint32_t &u){
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MPI_Allreduce(MPI_IN_PLACE,&u,1,MPI_UINT32_T,MPI_SUM,communicator);
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}
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void CartesianCommunicator::GlobalSum(float &f){
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MPI_Allreduce(MPI_IN_PLACE,&f,1,MPI_FLOAT,MPI_SUM,communicator);
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}
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void CartesianCommunicator::GlobalSumVector(float *f,int N)
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{
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MPI_Allreduce(MPI_IN_PLACE,f,N,MPI_FLOAT,MPI_SUM,communicator);
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}
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void CartesianCommunicator::GlobalSum(double &d)
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{
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MPI_Allreduce(MPI_IN_PLACE,&d,1,MPI_DOUBLE,MPI_SUM,communicator);
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}
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void CartesianCommunicator::GlobalSumVector(double *d,int N)
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{
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MPI_Allreduce(MPI_IN_PLACE,d,N,MPI_DOUBLE,MPI_SUM,communicator);
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}
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void CartesianCommunicator::ShiftedRanks(int dim,int shift,int &source,int &dest)
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{
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MPI_Cart_shift(communicator,dim,shift,&source,&dest);
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}
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int CartesianCommunicator::RankFromProcessorCoor(std::vector<int> &coor)
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{
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int rank;
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MPI_Cart_rank (communicator, &coor[0], &rank);
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return rank;
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}
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void CartesianCommunicator::ProcessorCoorFromRank(int rank, std::vector<int> &coor)
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{
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coor.resize(_ndimension);
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MPI_Cart_coords (communicator, rank, _ndimension,&coor[0]);
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}
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// Basic Halo comms primitive
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void CartesianCommunicator::SendToRecvFrom(void *xmit,
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int dest,
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void *recv,
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int from,
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int bytes)
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{
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MPI_Request reqs[2];
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MPI_Status OkeyDokey[2];
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int rank = _processor;
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MPI_Isend(xmit, bytes, MPI_CHAR,dest,_processor,communicator,&reqs[0]);
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MPI_Irecv(recv, bytes, MPI_CHAR,from,from,communicator,&reqs[1]);
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MPI_Waitall(2,reqs,OkeyDokey);
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}
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void CartesianCommunicator::Barrier(void)
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{
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MPI_Barrier(communicator);
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}
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void CartesianCommunicator::Broadcast(int root,void* data, int bytes)
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{
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MPI_Bcast(data,
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bytes,
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MPI_BYTE,
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root,
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communicator);
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}
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void CartesianCommunicator::BroadcastWorld(int root,void* data, int bytes)
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{
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MPI_Bcast(data,
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bytes,
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MPI_BYTE,
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root,
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MPI_COMM_WORLD);
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}
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}
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