forked from lijiext/lammps
540 lines
18 KiB
Plaintext
540 lines
18 KiB
Plaintext
/* ----------------------------------------------------------------------
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LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
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Original Version:
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http://lammps.sandia.gov, Sandia National Laboratories
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Steve Plimpton, sjplimp@sandia.gov
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See the README file in the top-level LAMMPS directory.
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-----------------------------------------------------------------------
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USER-CUDA Package and associated modifications:
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https://sourceforge.net/projects/lammpscuda/
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Christian Trott, christian.trott@tu-ilmenau.de
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Lars Winterfeld, lars.winterfeld@tu-ilmenau.de
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Theoretical Physics II, University of Technology Ilmenau, Germany
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See the README file in the USER-CUDA directory.
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This software is distributed under the GNU General Public License.
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------------------------------------------------------------------------- */
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#include <stdio.h>
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#define MY_PREFIX comm_cuda
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#include "cuda_shared.h"
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#include "cuda_common.h"
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#include "crm_cuda_utils.cu"
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#include "comm_cuda_cu.h"
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#include "comm_cuda_kernel.cu"
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#include <ctime>
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void Cuda_CommCuda_UpdateBuffer(cuda_shared_data* sdata, int n)
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{
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int size = n * 3 * sizeof(X_FLOAT);
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if(sdata->buffersize < size) {
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MYDBG(printf("Cuda_ComputeTempCuda Resizing Buffer at %p with %i kB to\n", sdata->buffer, sdata->buffersize);)
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CudaWrapper_FreeCudaData(sdata->buffer, sdata->buffersize);
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sdata->buffer = CudaWrapper_AllocCudaData(size);
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sdata->buffersize = size;
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sdata->buffer_new++;
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MYDBG(printf("New buffer at %p with %i kB\n", sdata->buffer, sdata->buffersize);)
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}
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cudaMemcpyToSymbol(MY_AP(buffer), & sdata->buffer, sizeof(int*));
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}
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void Cuda_CommCuda_UpdateNmax(cuda_shared_data* sdata)
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{
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cudaMemcpyToSymbol(MY_AP(nlocal) , & sdata->atom.nlocal , sizeof(int));
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cudaMemcpyToSymbol(MY_AP(nmax) , & sdata->atom.nmax , sizeof(int));
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cudaMemcpyToSymbol(MY_AP(x) , & sdata->atom.x .dev_data, sizeof(X_FLOAT*));
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cudaMemcpyToSymbol(MY_AP(v) , & sdata->atom.v .dev_data, sizeof(X_FLOAT*));
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cudaMemcpyToSymbol(MY_AP(f) , & sdata->atom.f .dev_data, sizeof(F_FLOAT*));
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cudaMemcpyToSymbol(MY_AP(type) , & sdata->atom.type .dev_data, sizeof(int*));
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}
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void Cuda_CommCuda_Init(cuda_shared_data* sdata)
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{
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Cuda_CommCuda_UpdateNmax(sdata);
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int ntypesp = sdata->atom.ntypes + 1;
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cudaMemcpyToSymbol(MY_AP(cuda_ntypes) , &ntypesp, sizeof(int));
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cudaMemcpyToSymbol(MY_AP(prd) , sdata->domain.prd, 3 * sizeof(X_FLOAT));
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cudaMemcpyToSymbol(MY_AP(flag) , &sdata->flag, sizeof(int*));
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cudaMemcpyToSymbol(MY_AP(debugdata) , &sdata->debugdata, sizeof(int*));
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}
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int Cuda_CommCuda_PackComm(cuda_shared_data* sdata, int n, int iswap, void* buf_send, int* pbc, int pbc_flag)
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{
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timespec time1, time2;
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if(sdata->atom.update_nmax)
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Cuda_CommCuda_UpdateNmax(sdata);
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if(sdata->atom.update_nlocal)
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cudaMemcpyToSymbol(MY_AP(nlocal) , & sdata->atom.nlocal , sizeof(int));
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int size = n * 3 * sizeof(X_FLOAT);
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if(sdata->buffer_new or (size > sdata->buffersize))
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Cuda_CommCuda_UpdateBuffer(sdata, n);
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X_FLOAT dx = 0.0;
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X_FLOAT dy = 0.0;
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X_FLOAT dz = 0.0;
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if(pbc_flag != 0) {
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if(sdata->domain.triclinic == 0) {
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dx = pbc[0] * sdata->domain.prd[0];
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dy = pbc[1] * sdata->domain.prd[1];
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dz = pbc[2] * sdata->domain.prd[2];
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} else {
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dx = pbc[0] * sdata->domain.prd[0] + pbc[5] * sdata->domain.xy + pbc[4] * sdata->domain.xz;
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dy = pbc[1] * sdata->domain.prd[1] + pbc[3] * sdata->domain.yz;
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dz = pbc[2] * sdata->domain.prd[2];
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}
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}
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int3 layout = getgrid(n);
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dim3 threads(layout.z, 1, 1);
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dim3 grid(layout.x, layout.y, 1);
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if(sdata->atom.nlocal > 0) {
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cudaMemset(sdata->flag, 0, sizeof(int));
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clock_gettime(CLOCK_REALTIME, &time1);
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void* buf = sdata->overlap_comm ? sdata->comm.buf_send_dev[iswap] : sdata->buffer;
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Cuda_CommCuda_PackComm_Kernel <<< grid, threads, 0>>>((int*) sdata->comm.sendlist.dev_data, n
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, sdata->comm.maxlistlength, iswap, dx, dy, dz, buf);
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cudaThreadSynchronize();
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clock_gettime(CLOCK_REALTIME, &time2);
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sdata->cuda_timings.comm_forward_kernel_pack +=
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time2.tv_sec - time1.tv_sec + 1.0 * (time2.tv_nsec - time1.tv_nsec) / 1000000000;
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CUT_CHECK_ERROR("Cuda_CommCuda_PackComm: Kernel execution failed");
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if(not sdata->overlap_comm)
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cudaMemcpy(buf_send, sdata->buffer, n * 3 * sizeof(X_FLOAT), cudaMemcpyDeviceToHost);
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//cudaMemcpy(buf_send, sdata->comm.buf_send_dev[iswap], n*3*sizeof(X_FLOAT), cudaMemcpyDeviceToHost);
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clock_gettime(CLOCK_REALTIME, &time1);
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sdata->cuda_timings.comm_forward_download +=
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time1.tv_sec - time2.tv_sec + 1.0 * (time1.tv_nsec - time2.tv_nsec) / 1000000000;
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int aflag;
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cudaMemcpy(&aflag, sdata->flag, sizeof(int), cudaMemcpyDeviceToHost);
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if(aflag != 0) printf("aflag PackComm: %i\n", aflag);
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CUT_CHECK_ERROR("Cuda_CommCuda_PackComm: Kernel execution failed");
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}
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return 3 * n;
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}
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int Cuda_CommCuda_PackCommVel(cuda_shared_data* sdata, int n, int iswap, void* buf_send, int* pbc, int pbc_flag)
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{
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timespec time1, time2;
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if(sdata->atom.update_nmax)
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Cuda_CommCuda_UpdateNmax(sdata);
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if(sdata->atom.update_nlocal)
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cudaMemcpyToSymbol(MY_AP(nlocal) , & sdata->atom.nlocal , sizeof(int));
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int size = n * 6 * sizeof(X_FLOAT);
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if(sdata->buffer_new or (size > sdata->buffersize))
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Cuda_CommCuda_UpdateBuffer(sdata, n);
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X_FLOAT dx = 0.0;
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X_FLOAT dy = 0.0;
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X_FLOAT dz = 0.0;
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if(pbc_flag != 0) {
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if(sdata->domain.triclinic == 0) {
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dx = pbc[0] * sdata->domain.prd[0];
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dy = pbc[1] * sdata->domain.prd[1];
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dz = pbc[2] * sdata->domain.prd[2];
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} else {
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dx = pbc[0] * sdata->domain.prd[0] + pbc[5] * sdata->domain.xy + pbc[4] * sdata->domain.xz;
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dy = pbc[1] * sdata->domain.prd[1] + pbc[3] * sdata->domain.yz;
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dz = pbc[2] * sdata->domain.prd[2];
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}
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}
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int3 layout = getgrid(n);
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dim3 threads(layout.z, 1, 1);
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dim3 grid(layout.x, layout.y, 1);
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if(sdata->atom.nlocal > 0) {
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cudaMemset(sdata->flag, 0, sizeof(int));
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clock_gettime(CLOCK_REALTIME, &time1);
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void* buf = sdata->overlap_comm ? sdata->comm.buf_send_dev[iswap] : sdata->buffer;
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Cuda_CommCuda_PackComm_Kernel <<< grid, threads, 0>>>((int*) sdata->comm.sendlist.dev_data, n
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, sdata->comm.maxlistlength, iswap, dx, dy, dz, buf);
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cudaThreadSynchronize();
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clock_gettime(CLOCK_REALTIME, &time2);
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sdata->cuda_timings.comm_forward_kernel_pack +=
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time2.tv_sec - time1.tv_sec + 1.0 * (time2.tv_nsec - time1.tv_nsec) / 1000000000;
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CUT_CHECK_ERROR("Cuda_CommCuda_PackComm: Kernel execution failed");
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if(not sdata->overlap_comm)
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cudaMemcpy(buf_send, sdata->buffer, n * 6 * sizeof(X_FLOAT), cudaMemcpyDeviceToHost);
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//cudaMemcpy(buf_send, sdata->comm.buf_send_dev[iswap], n*3*sizeof(X_FLOAT), cudaMemcpyDeviceToHost);
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clock_gettime(CLOCK_REALTIME, &time1);
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sdata->cuda_timings.comm_forward_download +=
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time1.tv_sec - time2.tv_sec + 1.0 * (time1.tv_nsec - time2.tv_nsec) / 1000000000;
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int aflag;
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cudaMemcpy(&aflag, sdata->flag, sizeof(int), cudaMemcpyDeviceToHost);
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if(aflag != 0) printf("aflag PackComm: %i\n", aflag);
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CUT_CHECK_ERROR("Cuda_CommCuda_PackComm: Kernel execution failed");
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}
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return 6 * n;
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}
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int Cuda_CommCuda_PackComm_Self(cuda_shared_data* sdata, int n, int iswap, int first, int* pbc, int pbc_flag)
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{
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MYDBG(printf(" # CUDA: CommCuda_PackComm_Self\n");)
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timespec time1, time2;
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if(sdata->atom.update_nmax)
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Cuda_CommCuda_UpdateNmax(sdata);
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if(sdata->atom.update_nlocal)
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cudaMemcpyToSymbol(MY_AP(nlocal) , & sdata->atom.nlocal , sizeof(int));
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int size = n * 3 * sizeof(X_FLOAT);
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if(sdata->buffer_new or (size > sdata->buffersize))
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Cuda_CommCuda_UpdateBuffer(sdata, n);
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static int count = -1;
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count++;
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X_FLOAT dx = 0.0;
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X_FLOAT dy = 0.0;
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X_FLOAT dz = 0.0;
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if(pbc_flag != 0) {
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if(sdata->domain.triclinic == 0) {
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dx = pbc[0] * sdata->domain.prd[0];
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dy = pbc[1] * sdata->domain.prd[1];
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dz = pbc[2] * sdata->domain.prd[2];
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} else {
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dx = pbc[0] * sdata->domain.prd[0] + pbc[5] * sdata->domain.xy + pbc[4] * sdata->domain.xz;
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dy = pbc[1] * sdata->domain.prd[1] + pbc[3] * sdata->domain.yz;
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dz = pbc[2] * sdata->domain.prd[2];
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}
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}
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int3 layout = getgrid(n);
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dim3 threads(layout.z, 1, 1);
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dim3 grid(layout.x, layout.y, 1);
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if(sdata->atom.nlocal > 0) {
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clock_gettime(CLOCK_REALTIME, &time1);
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Cuda_CommCuda_PackComm_Self_Kernel <<< grid, threads, 0>>>((int*) sdata->comm.sendlist.dev_data, n, sdata->comm.maxlistlength, iswap, dx, dy, dz, first);
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cudaThreadSynchronize();
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clock_gettime(CLOCK_REALTIME, &time2);
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sdata->cuda_timings.comm_forward_kernel_self +=
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time2.tv_sec - time1.tv_sec + 1.0 * (time2.tv_nsec - time1.tv_nsec) / 1000000000;
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CUT_CHECK_ERROR("Cuda_CommCuda_PackComm_Self: Kernel execution failed");
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}
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return 3 * n;
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}
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int Cuda_CommCuda_PackCommVel_Self(cuda_shared_data* sdata, int n, int iswap, int first, int* pbc, int pbc_flag)
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{
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MYDBG(printf(" # CUDA: CommCuda_PackComm_Self\n");)
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timespec time1, time2;
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if(sdata->atom.update_nmax)
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Cuda_CommCuda_UpdateNmax(sdata);
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if(sdata->atom.update_nlocal)
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cudaMemcpyToSymbol(MY_AP(nlocal) , & sdata->atom.nlocal , sizeof(int));
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int size = n * 6 * sizeof(X_FLOAT);
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if(sdata->buffer_new or (size > sdata->buffersize))
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Cuda_CommCuda_UpdateBuffer(sdata, n);
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static int count = -1;
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count++;
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X_FLOAT dx = 0.0;
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X_FLOAT dy = 0.0;
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X_FLOAT dz = 0.0;
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if(pbc_flag != 0) {
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if(sdata->domain.triclinic == 0) {
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dx = pbc[0] * sdata->domain.prd[0];
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dy = pbc[1] * sdata->domain.prd[1];
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dz = pbc[2] * sdata->domain.prd[2];
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} else {
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dx = pbc[0] * sdata->domain.prd[0] + pbc[5] * sdata->domain.xy + pbc[4] * sdata->domain.xz;
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dy = pbc[1] * sdata->domain.prd[1] + pbc[3] * sdata->domain.yz;
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dz = pbc[2] * sdata->domain.prd[2];
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}
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}
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int3 layout = getgrid(n);
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dim3 threads(layout.z, 1, 1);
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dim3 grid(layout.x, layout.y, 1);
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if(sdata->atom.nlocal > 0) {
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clock_gettime(CLOCK_REALTIME, &time1);
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Cuda_CommCuda_PackComm_Self_Kernel <<< grid, threads, 0>>>((int*) sdata->comm.sendlist.dev_data, n, sdata->comm.maxlistlength, iswap, dx, dy, dz, first);
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cudaThreadSynchronize();
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clock_gettime(CLOCK_REALTIME, &time2);
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sdata->cuda_timings.comm_forward_kernel_self +=
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time2.tv_sec - time1.tv_sec + 1.0 * (time2.tv_nsec - time1.tv_nsec) / 1000000000;
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CUT_CHECK_ERROR("Cuda_CommCuda_PackComm_Self: Kernel execution failed");
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}
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return 6 * n;
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}
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void Cuda_CommCuda_UnpackComm(cuda_shared_data* sdata, int n, int first, void* buf_recv, int iswap)
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{
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timespec time1, time2;
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if(sdata->atom.update_nmax)
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Cuda_CommCuda_UpdateNmax(sdata);
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if(sdata->atom.update_nlocal)
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cudaMemcpyToSymbol(MY_AP(nlocal) , & sdata->atom.nlocal , sizeof(int));
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int size = n * 3 * sizeof(X_FLOAT);
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if(sdata->buffer_new or (size > sdata->buffersize))
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Cuda_CommCuda_UpdateBuffer(sdata, n);
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int3 layout = getgrid(n);
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dim3 threads(layout.z, 1, 1);
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dim3 grid(layout.x, layout.y, 1);
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if(sdata->atom.nlocal > 0) {
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clock_gettime(CLOCK_REALTIME, &time1);
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if(not sdata->overlap_comm || iswap < 0)
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cudaMemcpy(sdata->buffer, (void*)buf_recv, n * 3 * sizeof(X_FLOAT), cudaMemcpyHostToDevice);
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clock_gettime(CLOCK_REALTIME, &time2);
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sdata->cuda_timings.comm_forward_upload +=
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time2.tv_sec - time1.tv_sec + 1.0 * (time2.tv_nsec - time1.tv_nsec) / 1000000000;
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void* buf = (sdata->overlap_comm && iswap >= 0) ? sdata->comm.buf_recv_dev[iswap] : sdata->buffer;
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Cuda_CommCuda_UnpackComm_Kernel <<< grid, threads, 0>>>(n, first, buf);
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cudaThreadSynchronize();
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clock_gettime(CLOCK_REALTIME, &time1);
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sdata->cuda_timings.comm_forward_kernel_unpack +=
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time1.tv_sec - time2.tv_sec + 1.0 * (time1.tv_nsec - time2.tv_nsec) / 1000000000;
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CUT_CHECK_ERROR("Cuda_CommCuda_UnpackComm: Kernel execution failed");
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}
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}
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void Cuda_CommCuda_UnpackCommVel(cuda_shared_data* sdata, int n, int first, void* buf_recv, int iswap)
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{
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timespec time1, time2;
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if(sdata->atom.update_nmax)
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Cuda_CommCuda_UpdateNmax(sdata);
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if(sdata->atom.update_nlocal)
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cudaMemcpyToSymbol(MY_AP(nlocal) , & sdata->atom.nlocal , sizeof(int));
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int size = n * 6 * sizeof(X_FLOAT);
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if(sdata->buffer_new or (size > sdata->buffersize))
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Cuda_CommCuda_UpdateBuffer(sdata, n);
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int3 layout = getgrid(n);
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dim3 threads(layout.z, 1, 1);
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dim3 grid(layout.x, layout.y, 1);
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if(sdata->atom.nlocal > 0) {
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clock_gettime(CLOCK_REALTIME, &time1);
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if(not sdata->overlap_comm || iswap < 0)
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cudaMemcpy(sdata->buffer, (void*)buf_recv, n * 6 * sizeof(X_FLOAT), cudaMemcpyHostToDevice);
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clock_gettime(CLOCK_REALTIME, &time2);
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sdata->cuda_timings.comm_forward_upload +=
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time2.tv_sec - time1.tv_sec + 1.0 * (time2.tv_nsec - time1.tv_nsec) / 1000000000;
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void* buf = (sdata->overlap_comm && iswap >= 0) ? sdata->comm.buf_recv_dev[iswap] : sdata->buffer;
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Cuda_CommCuda_UnpackComm_Kernel <<< grid, threads, 0>>>(n, first, buf);
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cudaThreadSynchronize();
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clock_gettime(CLOCK_REALTIME, &time1);
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sdata->cuda_timings.comm_forward_kernel_unpack +=
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time1.tv_sec - time2.tv_sec + 1.0 * (time1.tv_nsec - time2.tv_nsec) / 1000000000;
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CUT_CHECK_ERROR("Cuda_CommCuda_UnpackComm: Kernel execution failed");
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}
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}
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int Cuda_CommCuda_PackReverse(cuda_shared_data* sdata, int n, int first, void* buf_send)
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{
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if(sdata->atom.update_nmax)
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Cuda_CommCuda_UpdateNmax(sdata);
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if(sdata->atom.update_nlocal)
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cudaMemcpyToSymbol(MY_AP(nlocal) , & sdata->atom.nlocal , sizeof(int));
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int size = n * 3 * sizeof(F_FLOAT);
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if(sdata->buffer_new or (size > sdata->buffersize))
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Cuda_CommCuda_UpdateBuffer(sdata, n);
|
|
|
|
|
|
F_FLOAT* buf = (F_FLOAT*)buf_send;
|
|
F_FLOAT* f_dev = (F_FLOAT*)sdata->atom.f.dev_data;
|
|
f_dev += first;
|
|
cudaMemcpy(buf, f_dev, n * sizeof(F_FLOAT), cudaMemcpyDeviceToHost);
|
|
buf += n;
|
|
f_dev += sdata->atom.nmax;
|
|
cudaMemcpy(buf, f_dev, n * sizeof(F_FLOAT), cudaMemcpyDeviceToHost);
|
|
buf += n;
|
|
f_dev += sdata->atom.nmax;
|
|
cudaMemcpy(buf, f_dev, n * sizeof(F_FLOAT), cudaMemcpyDeviceToHost);
|
|
return n * 3;
|
|
}
|
|
|
|
|
|
void Cuda_CommCuda_UnpackReverse(cuda_shared_data* sdata, int n, int iswap, void* buf_recv)
|
|
{
|
|
if(sdata->atom.update_nmax)
|
|
Cuda_CommCuda_UpdateNmax(sdata);
|
|
|
|
if(sdata->atom.update_nlocal)
|
|
cudaMemcpyToSymbol(MY_AP(nlocal) , & sdata->atom.nlocal , sizeof(int));
|
|
|
|
int size = n * 3 * sizeof(F_FLOAT);
|
|
|
|
if(sdata->buffer_new or (size > sdata->buffersize))
|
|
Cuda_CommCuda_UpdateBuffer(sdata, n);
|
|
|
|
|
|
int3 layout = getgrid(n);
|
|
dim3 threads(layout.z, 1, 1);
|
|
dim3 grid(layout.x, layout.y, 1);
|
|
|
|
if(sdata->atom.nlocal > 0) {
|
|
cudaMemcpy(sdata->buffer, buf_recv, size, cudaMemcpyHostToDevice);
|
|
Cuda_CommCuda_UnpackReverse_Kernel <<< grid, threads, 0>>>((int*) sdata->comm.sendlist.dev_data, n, sdata->comm.maxlistlength, iswap);
|
|
cudaThreadSynchronize();
|
|
CUT_CHECK_ERROR("Cuda_CommCuda_UnpackReverse: Kernel execution failed");
|
|
}
|
|
}
|
|
|
|
void Cuda_CommCuda_UnpackReverse_Self(cuda_shared_data* sdata, int n, int iswap, int first)
|
|
{
|
|
if(sdata->atom.update_nmax)
|
|
Cuda_CommCuda_UpdateNmax(sdata);
|
|
|
|
if(sdata->atom.update_nlocal)
|
|
cudaMemcpyToSymbol(MY_AP(nlocal) , & sdata->atom.nlocal , sizeof(int));
|
|
|
|
int size = n * 3 * sizeof(X_FLOAT);
|
|
|
|
if(sdata->buffer_new or (size > sdata->buffersize))
|
|
Cuda_CommCuda_UpdateBuffer(sdata, n);
|
|
|
|
int3 layout = getgrid(n);
|
|
dim3 threads(layout.z, 1, 1);
|
|
dim3 grid(layout.x, layout.y, 1);
|
|
|
|
if(sdata->atom.nlocal > 0) {
|
|
Cuda_CommCuda_UnpackReverse_Self_Kernel <<< grid, threads, 0>>>((int*) sdata->comm.sendlist.dev_data, n, sdata->comm.maxlistlength, iswap, first);
|
|
cudaThreadSynchronize();
|
|
CUT_CHECK_ERROR("Cuda_CommCuda_PackReverse_Self: Kernel execution failed");
|
|
|
|
}
|
|
}
|
|
|
|
|
|
int Cuda_CommCuda_BuildSendlist(cuda_shared_data* sdata, int bordergroup, int ineed, int style, int atom_nfirst, int nfirst, int nlast, int dim, int iswap)
|
|
{
|
|
MYDBG(printf(" # CUDA: CommCuda_BuildSendlist\n");)
|
|
timespec time1, time2;
|
|
|
|
if(sdata->atom.update_nmax)
|
|
Cuda_CommCuda_UpdateNmax(sdata);
|
|
|
|
if(sdata->atom.update_nlocal)
|
|
cudaMemcpyToSymbol(MY_AP(nlocal) , & sdata->atom.nlocal , sizeof(int));
|
|
|
|
if(sdata->buffer_new or (80 > sdata->buffersize))
|
|
Cuda_CommCuda_UpdateBuffer(sdata, 10);
|
|
|
|
int n;
|
|
|
|
if(!bordergroup || ineed >= 2)
|
|
n = nlast - nfirst + 1;
|
|
else {
|
|
n = atom_nfirst;
|
|
|
|
if(nlast - sdata->atom.nlocal + 1 > n) n = nlast - sdata->atom.nlocal + 1;
|
|
}
|
|
|
|
int3 layout = getgrid(n, 0, 512, true);
|
|
dim3 threads(layout.z, 1, 1);
|
|
dim3 grid(layout.x + 1, layout.y, 1);
|
|
|
|
|
|
cudaMemset((int*)(sdata->buffer), 0, sizeof(int));
|
|
|
|
clock_gettime(CLOCK_REALTIME, &time1);
|
|
|
|
if(style == 1)
|
|
Cuda_CommCuda_BuildSendlist_Single <<< grid, threads, (threads.x + 1)*sizeof(int) >>> (bordergroup, ineed, atom_nfirst, nfirst, nlast, dim, iswap, (X_FLOAT*) sdata->comm.slablo.dev_data, (X_FLOAT*) sdata->comm.slabhi.dev_data, (int*) sdata->comm.sendlist.dev_data, sdata->comm.maxlistlength);
|
|
else
|
|
Cuda_CommCuda_BuildSendlist_Multi <<< grid, threads, (threads.x + 1)*sizeof(int) >>> (bordergroup, ineed, atom_nfirst, nfirst, nlast, dim, iswap, (X_FLOAT*) sdata->comm.multilo.dev_data, (X_FLOAT*) sdata->comm.multihi.dev_data, (int*) sdata->comm.sendlist.dev_data, sdata->comm.maxlistlength);
|
|
|
|
cudaThreadSynchronize();
|
|
clock_gettime(CLOCK_REALTIME, &time2);
|
|
sdata->cuda_timings.comm_border_kernel_buildlist +=
|
|
time2.tv_sec - time1.tv_sec + 1.0 * (time2.tv_nsec - time1.tv_nsec) / 1000000000;
|
|
|
|
CUT_CHECK_ERROR("Cuda_CommCuda_BuildSendlist: Kernel execution failed");
|
|
int nsend;
|
|
cudaMemcpy(&nsend, sdata->buffer, sizeof(int), cudaMemcpyDeviceToHost);
|
|
return nsend;
|
|
|
|
|
|
}
|
|
|