mirror of
https://github.com/paboyle/Grid.git
synced 2024-11-14 01:35:36 +00:00
86 lines
2.0 KiB
C++
86 lines
2.0 KiB
C++
|
#include "Grid.h"
|
||
|
|
#include <mpi.h>
|
||
|
|
|
||
|
|
namespace dpo {
|
||
|
|
|
||
|
|
// Should error check all MPI calls.
|
||
|
|
|
||
|
|
CartesianCommunicator::CartesianCommunicator(std::vector<int> &processors)
|
||
|
|
{
|
||
|
|
_ndimension = _processors.size();
|
||
|
|
std::vector<int> periodic(_ndimension,1);
|
||
|
|
|
||
|
|
_processors = processors;
|
||
|
|
_processor_coords.resize(_ndimension);
|
||
|
|
|
||
|
|
MPI_Cart_create(MPI_COMM_WORLD _ndimension,&_processors[0],&periodic[0],1,&communicator);
|
||
|
|
MPI_Comm_rank(communicator,&_processor);
|
||
|
|
MPI_Cart_coords(communicator,_processor,_ndimension,&_processor_coords[0]);
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
void CartesianCommunicator::GlobalSumF(float &f){
|
||
|
|
MPI_Allreduce(&f,&f,1,MPI_FLOAT,MPI_SUM,communicator);
|
||
|
|
}
|
||
|
|
void CartesianCommunicator::GlobalSumFVector(float *f,int N)
|
||
|
|
{
|
||
|
|
MPI_Allreduce(f,f,N,MPI_FLOAT,MPI_SUM,communicator);
|
||
|
|
}
|
||
|
|
void CartesianCommunicator::GlobalSumF(double &d)
|
||
|
|
{
|
||
|
|
MPI_Allreduce(&d,&d,1,MPI_DOUBLE,MPI_SUM,communicator);
|
||
|
|
}
|
||
|
|
void CartesianCommunicator::GlobalSumFVector(double *d,int N)
|
||
|
|
{
|
||
|
|
MPI_Allreduce(d,d,N,MPI_DOUBLE,MPI_SUM,communicator);
|
||
|
|
}
|
||
|
|
|
||
|
|
int CartesianCommunicator::ShiftedRank(int dim,int shift)
|
||
|
|
{
|
||
|
|
int rank;
|
||
|
|
MPI_Cart_shift(communicator,dim,shift,&_processor,&rank);
|
||
|
|
return rank;
|
||
|
|
}
|
||
|
|
int CartesianCommunicator::Rank(std::vector<int> coor)
|
||
|
|
{
|
||
|
|
int rank;
|
||
|
|
MPI_Cart_rank (communicator, &coor[0], &rank);
|
||
|
|
return rank;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Basic Halo comms primitive
|
||
|
|
void CartesianCommunicator::SendToRecvFrom(void *xmit,
|
||
|
|
std::vector<int> &to_coordinate,
|
||
|
|
void *recv,
|
||
|
|
std::vector<int> &from_coordinate,
|
||
|
|
int bytes)
|
||
|
|
{
|
||
|
|
int dest = Rank(to_coordinate);
|
||
|
|
int from = Rank(from_coordinate);
|
||
|
|
|
||
|
|
MPI_Request x_req;
|
||
|
|
MPI_Request r_req;
|
||
|
|
MPI_Status OkeyDokey;
|
||
|
|
|
||
|
|
MPI_Isend(xmit, bytes, MPI_CHAR,dest,dest,communicator,&x_req);
|
||
|
|
MPI_Irecv(recv, bytes, MPI_CHAR,from,from,communicator,&r_req);
|
||
|
|
MPI_Wait(&x_req,&OkeyDokey);
|
||
|
|
MPI_Wait(&r_req,&OkeyDokey);
|
||
|
|
MPI_Barrier();
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
#if 0
|
||
|
|
|
||
|
|
// Could possibly do a direct block strided send?
|
||
|
|
int MPI_Type_vector(
|
||
|
|
int count,
|
||
|
|
int blocklength,
|
||
|
|
int stride,
|
||
|
|
MPI_Datatype old_type,
|
||
|
|
MPI_Datatype *newtype_p
|
||
|
|
);
|
||
|
|
|
||
|
|
#endif
|