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CSHIFT with bounce throuhgh Host memory on MPI packets
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@ -68,7 +68,7 @@ template<class vobj> Lattice<vobj> Cshift(const Lattice<vobj> &rhs,int dimension
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if(Cshift_verbose) std::cout << GridLogPerformance << "Cshift took "<< (t1-t0)/1e3 << " ms"<<std::endl;
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return ret;
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}
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#if 1
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template<class vobj> void Cshift_comms(Lattice<vobj>& ret,const Lattice<vobj> &rhs,int dimension,int shift)
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{
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int sshift[2];
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@ -125,7 +125,11 @@ template<class vobj> void Cshift_comms(Lattice<vobj> &ret,const Lattice<vobj> &r
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int buffer_size = rhs.Grid()->_slice_nblock[dimension]*rhs.Grid()->_slice_block[dimension];
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static deviceVector<vobj> send_buf; send_buf.resize(buffer_size);
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static deviceVector<vobj> recv_buf; recv_buf.resize(buffer_size);
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#ifndef ACCELERATOR_AWARE_MPI
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static hostVector<vobj> hsend_buf; hsend_buf.resize(buffer_size);
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static hostVector<vobj> hrecv_buf; hrecv_buf.resize(buffer_size);
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#endif
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int cb= (cbmask==0x2)? Odd : Even;
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int sshift= rhs.Grid()->CheckerBoardShiftForCB(rhs.Checkerboard(),dimension,shift,cb);
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RealD tcopy=0.0;
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@ -156,16 +160,29 @@ template<class vobj> void Cshift_comms(Lattice<vobj> &ret,const Lattice<vobj> &r
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// int rank = grid->_processor;
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int recv_from_rank;
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int xmit_to_rank;
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grid->ShiftedRanks(dimension,comm_proc,xmit_to_rank,recv_from_rank);
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tcomms-=usecond();
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grid->Barrier();
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#ifdef ACCELERATOR_AWARE_MPI
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grid->SendToRecvFrom((void *)&send_buf[0],
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xmit_to_rank,
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(void *)&recv_buf[0],
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recv_from_rank,
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bytes);
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#else
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// bouncy bouncy
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acceleratorCopyFromDevice(&send_buf[0],&hsend_buf[0],bytes);
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grid->SendToRecvFrom((void *)&hsend_buf[0],
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xmit_to_rank,
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(void *)&hrecv_buf[0],
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recv_from_rank,
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bytes);
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acceleratorCopyToDevice(&hrecv_buf[0],&recv_buf[0],bytes);
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#endif
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xbytes+=bytes;
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grid->Barrier();
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tcomms+=usecond();
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@ -226,12 +243,17 @@ template<class vobj> void Cshift_comms_simd(Lattice<vobj> &ret,const Lattice<vo
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static std::vector<deviceVector<scalar_object> > recv_buf_extract; recv_buf_extract.resize(Nsimd);
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scalar_object * recv_buf_extract_mpi;
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scalar_object * send_buf_extract_mpi;
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for(int s=0;s<Nsimd;s++){
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send_buf_extract[s].resize(buffer_size);
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recv_buf_extract[s].resize(buffer_size);
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}
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#ifndef ACCELERATOR_AWARE_MPI
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hostVector<scalar_object> hsend_buf; hsend_buf.resize(buffer_size);
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hostVector<scalar_object> hrecv_buf; hrecv_buf.resize(buffer_size);
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#endif
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int bytes = buffer_size*sizeof(scalar_object);
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ExtractPointerArray<scalar_object> pointers(Nsimd); //
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@ -283,11 +305,22 @@ template<class vobj> void Cshift_comms_simd(Lattice<vobj> &ret,const Lattice<vo
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send_buf_extract_mpi = &send_buf_extract[nbr_lane][0];
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recv_buf_extract_mpi = &recv_buf_extract[i][0];
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#ifdef ACCELERATOR_AWARE_MPI
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grid->SendToRecvFrom((void *)send_buf_extract_mpi,
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xmit_to_rank,
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(void *)recv_buf_extract_mpi,
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recv_from_rank,
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bytes);
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#else
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// bouncy bouncy
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acceleratorCopyFromDevice((void *)send_buf_extract_mpi,(void *)&hsend_buf[0],bytes);
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grid->SendToRecvFrom((void *)&hsend_buf[0],
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xmit_to_rank,
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(void *)&hrecv_buf[0],
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recv_from_rank,
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bytes);
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acceleratorCopyToDevice((void *)&hrecv_buf[0],(void *)recv_buf_extract_mpi,bytes);
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#endif
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xbytes+=bytes;
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grid->Barrier();
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@ -311,234 +344,6 @@ template<class vobj> void Cshift_comms_simd(Lattice<vobj> &ret,const Lattice<vo
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std::cout << GridLogPerformance << " Cshift BW "<<(2.0*xbytes)/tcomms<<" MB/s "<<2*xbytes<< " Bytes "<<std::endl;
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}
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}
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#else
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template<class vobj> void Cshift_comms(Lattice<vobj> &ret,const Lattice<vobj> &rhs,int dimension,int shift,int cbmask)
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{
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typedef typename vobj::vector_type vector_type;
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typedef typename vobj::scalar_type scalar_type;
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GridBase *grid=rhs.Grid();
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Lattice<vobj> temp(rhs.Grid());
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int fd = rhs.Grid()->_fdimensions[dimension];
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int rd = rhs.Grid()->_rdimensions[dimension];
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int pd = rhs.Grid()->_processors[dimension];
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int simd_layout = rhs.Grid()->_simd_layout[dimension];
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int comm_dim = rhs.Grid()->_processors[dimension] >1 ;
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assert(simd_layout==1);
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assert(comm_dim==1);
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assert(shift>=0);
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assert(shift<fd);
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RealD tcopy=0.0;
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RealD tgather=0.0;
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RealD tscatter=0.0;
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RealD tcomms=0.0;
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uint64_t xbytes=0;
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int buffer_size = rhs.Grid()->_slice_nblock[dimension]*rhs.Grid()->_slice_block[dimension];
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static cshiftVector<vobj> send_buf_v; send_buf_v.resize(buffer_size);
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static cshiftVector<vobj> recv_buf_v; recv_buf_v.resize(buffer_size);
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vobj *send_buf;
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vobj *recv_buf;
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{
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grid->ShmBufferFreeAll();
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size_t bytes = buffer_size*sizeof(vobj);
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send_buf=(vobj *)grid->ShmBufferMalloc(bytes);
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recv_buf=(vobj *)grid->ShmBufferMalloc(bytes);
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}
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int cb= (cbmask==0x2)? Odd : Even;
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int sshift= rhs.Grid()->CheckerBoardShiftForCB(rhs.Checkerboard(),dimension,shift,cb);
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for(int x=0;x<rd;x++){
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int sx = (x+sshift)%rd;
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int comm_proc = ((x+sshift)/rd)%pd;
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if (comm_proc==0) {
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tcopy-=usecond();
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Copy_plane(ret,rhs,dimension,x,sx,cbmask);
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tcopy+=usecond();
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} else {
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int words = buffer_size;
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if (cbmask != 0x3) words=words>>1;
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int bytes = words * sizeof(vobj);
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tgather-=usecond();
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Gather_plane_simple (rhs,send_buf_v,dimension,sx,cbmask);
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tgather+=usecond();
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// int rank = grid->_processor;
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int recv_from_rank;
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int xmit_to_rank;
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grid->ShiftedRanks(dimension,comm_proc,xmit_to_rank,recv_from_rank);
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tcomms-=usecond();
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// grid->Barrier();
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acceleratorCopyDeviceToDevice((void *)&send_buf_v[0],(void *)&send_buf[0],bytes);
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grid->SendToRecvFrom((void *)&send_buf[0],
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xmit_to_rank,
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(void *)&recv_buf[0],
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recv_from_rank,
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bytes);
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xbytes+=bytes;
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acceleratorCopyDeviceToDevice((void *)&recv_buf[0],(void *)&recv_buf_v[0],bytes);
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// grid->Barrier();
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tcomms+=usecond();
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tscatter-=usecond();
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Scatter_plane_simple (ret,recv_buf_v,dimension,x,cbmask);
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tscatter+=usecond();
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}
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}
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if(Cshift_verbose){
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std::cout << GridLogPerformance << " Cshift copy "<<tcopy/1e3<<" ms"<<std::endl;
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std::cout << GridLogPerformance << " Cshift gather "<<tgather/1e3<<" ms"<<std::endl;
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std::cout << GridLogPerformance << " Cshift scatter "<<tscatter/1e3<<" ms"<<std::endl;
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std::cout << GridLogPerformance << " Cshift comm "<<tcomms/1e3<<" ms"<<std::endl;
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std::cout << GridLogPerformance << " Cshift BW "<<(2.0*xbytes)/tcomms<<" MB/s "<<2*xbytes<< " Bytes "<<std::endl;
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}
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}
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template<class vobj> void Cshift_comms_simd(Lattice<vobj> &ret,const Lattice<vobj> &rhs,int dimension,int shift,int cbmask)
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{
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GridBase *grid=rhs.Grid();
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const int Nsimd = grid->Nsimd();
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typedef typename vobj::vector_type vector_type;
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typedef typename vobj::scalar_object scalar_object;
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typedef typename vobj::scalar_type scalar_type;
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int fd = grid->_fdimensions[dimension];
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int rd = grid->_rdimensions[dimension];
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int ld = grid->_ldimensions[dimension];
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int pd = grid->_processors[dimension];
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int simd_layout = grid->_simd_layout[dimension];
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int comm_dim = grid->_processors[dimension] >1 ;
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//std::cout << "Cshift_comms_simd dim "<< dimension << " fd "<<fd<<" rd "<<rd
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// << " ld "<<ld<<" pd " << pd<<" simd_layout "<<simd_layout
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// << " comm_dim " << comm_dim << " cbmask " << cbmask <<std::endl;
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assert(comm_dim==1);
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assert(simd_layout==2);
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assert(shift>=0);
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assert(shift<fd);
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RealD tcopy=0.0;
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RealD tgather=0.0;
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RealD tscatter=0.0;
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RealD tcomms=0.0;
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uint64_t xbytes=0;
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int permute_type=grid->PermuteType(dimension);
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///////////////////////////////////////////////
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// Simd direction uses an extract/merge pair
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///////////////////////////////////////////////
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int buffer_size = grid->_slice_nblock[dimension]*grid->_slice_block[dimension];
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// int words = sizeof(vobj)/sizeof(vector_type);
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static std::vector<cshiftVector<scalar_object> > send_buf_extract; send_buf_extract.resize(Nsimd);
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static std::vector<cshiftVector<scalar_object> > recv_buf_extract; recv_buf_extract.resize(Nsimd);
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scalar_object * recv_buf_extract_mpi;
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scalar_object * send_buf_extract_mpi;
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{
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size_t bytes = sizeof(scalar_object)*buffer_size;
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grid->ShmBufferFreeAll();
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send_buf_extract_mpi = (scalar_object *)grid->ShmBufferMalloc(bytes);
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recv_buf_extract_mpi = (scalar_object *)grid->ShmBufferMalloc(bytes);
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}
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for(int s=0;s<Nsimd;s++){
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send_buf_extract[s].resize(buffer_size);
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recv_buf_extract[s].resize(buffer_size);
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}
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int bytes = buffer_size*sizeof(scalar_object);
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ExtractPointerArray<scalar_object> pointers(Nsimd); //
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ExtractPointerArray<scalar_object> rpointers(Nsimd); // received pointers
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///////////////////////////////////////////
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// Work out what to send where
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///////////////////////////////////////////
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int cb = (cbmask==0x2)? Odd : Even;
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int sshift= grid->CheckerBoardShiftForCB(rhs.Checkerboard(),dimension,shift,cb);
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// loop over outer coord planes orthog to dim
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for(int x=0;x<rd;x++){
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// FIXME call local permute copy if none are offnode.
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for(int i=0;i<Nsimd;i++){
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pointers[i] = &send_buf_extract[i][0];
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}
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tgather-=usecond();
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int sx = (x+sshift)%rd;
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Gather_plane_extract(rhs,pointers,dimension,sx,cbmask);
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tgather+=usecond();
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for(int i=0;i<Nsimd;i++){
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int inner_bit = (Nsimd>>(permute_type+1));
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int ic= (i&inner_bit)? 1:0;
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int my_coor = rd*ic + x;
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int nbr_coor = my_coor+sshift;
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int nbr_proc = ((nbr_coor)/ld) % pd;// relative shift in processors
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int nbr_ic = (nbr_coor%ld)/rd; // inner coord of peer
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int nbr_ox = (nbr_coor%rd); // outer coord of peer
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int nbr_lane = (i&(~inner_bit));
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int recv_from_rank;
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int xmit_to_rank;
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if (nbr_ic) nbr_lane|=inner_bit;
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assert (sx == nbr_ox);
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if(nbr_proc){
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grid->ShiftedRanks(dimension,nbr_proc,xmit_to_rank,recv_from_rank);
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tcomms-=usecond();
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// grid->Barrier();
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acceleratorCopyDeviceToDevice((void *)&send_buf_extract[nbr_lane][0],(void *)send_buf_extract_mpi,bytes);
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grid->SendToRecvFrom((void *)send_buf_extract_mpi,
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xmit_to_rank,
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(void *)recv_buf_extract_mpi,
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recv_from_rank,
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bytes);
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acceleratorCopyDeviceToDevice((void *)recv_buf_extract_mpi,(void *)&recv_buf_extract[i][0],bytes);
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xbytes+=bytes;
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// grid->Barrier();
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tcomms+=usecond();
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rpointers[i] = &recv_buf_extract[i][0];
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} else {
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rpointers[i] = &send_buf_extract[nbr_lane][0];
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}
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}
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tscatter-=usecond();
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Scatter_plane_merge(ret,rpointers,dimension,x,cbmask);
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tscatter+=usecond();
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}
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if(Cshift_verbose){
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std::cout << GridLogPerformance << " Cshift (s) copy "<<tcopy/1e3<<" ms"<<std::endl;
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std::cout << GridLogPerformance << " Cshift (s) gather "<<tgather/1e3<<" ms"<<std::endl;
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std::cout << GridLogPerformance << " Cshift (s) scatter "<<tscatter/1e3<<" ms"<<std::endl;
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std::cout << GridLogPerformance << " Cshift (s) comm "<<tcomms/1e3<<" ms"<<std::endl;
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std::cout << GridLogPerformance << " Cshift BW "<<(2.0*xbytes)/tcomms<<" MB/s"<<std::endl;
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}
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}
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#endif
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NAMESPACE_END(Grid);
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