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fix_nve_cuda.cu
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Tue, Nov 12, 09:26

fix_nve_cuda.cu
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/* ----------------------------------------------------------------------
LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
Original Version:
http://lammps.sandia.gov, Sandia National Laboratories
Steve Plimpton, sjplimp@sandia.gov
See the README file in the top-level LAMMPS directory.
-----------------------------------------------------------------------
USER-CUDA Package and associated modifications:
https://sourceforge.net/projects/lammpscuda/
Christian Trott, christian.trott@tu-ilmenau.de
Lars Winterfeld, lars.winterfeld@tu-ilmenau.de
Theoretical Physics II, University of Technology Ilmenau, Germany
See the README file in the USER-CUDA directory.
This software is distributed under the GNU General Public License.
------------------------------------------------------------------------- */
#include <stdio.h>
#define MY_PREFIX fix_nve_cuda
#define IncludeCommonNeigh
#include "cuda_shared.h"
#include "cuda_common.h"
#include "crm_cuda_utils.cu"
#include "fix_nve_cuda_cu.h"
#include "fix_nve_cuda_kernel.cu"
void Cuda_FixNVECuda_UpdateNmax(cuda_shared_data* sdata)
{
cudaMemcpyToSymbol(MY_AP(f) , & sdata->atom.f .dev_data, sizeof(F_FLOAT*));
cudaMemcpyToSymbol(MY_AP(mask) , & sdata->atom.mask .dev_data, sizeof(int*));
cudaMemcpyToSymbol(MY_AP(nlocal) , & sdata->atom.nlocal , sizeof(int));
cudaMemcpyToSymbol(MY_AP(nmax) , & sdata->atom.nmax , sizeof(int));
cudaMemcpyToSymbol(MY_AP(rmass) , & sdata->atom.rmass.dev_data, sizeof(V_FLOAT*));
cudaMemcpyToSymbol(MY_AP(mass) , & sdata->atom.mass.dev_data , sizeof(V_FLOAT*));
cudaMemcpyToSymbol(MY_AP(type) , & sdata->atom.type .dev_data, sizeof(int*));
cudaMemcpyToSymbol(MY_AP(v) , & sdata->atom.v .dev_data, sizeof(V_FLOAT*));
cudaMemcpyToSymbol(MY_AP(x) , & sdata->atom.x .dev_data, sizeof(X_FLOAT*));
cudaMemcpyToSymbol(MY_AP(xhold) , & sdata->atom.xhold.dev_data, sizeof(X_FLOAT*)); //might be moved to a neighbor record in sdata
cudaMemcpyToSymbol(MY_AP(maxhold) , & sdata->atom.maxhold, sizeof(int)); //might be moved to a neighbor record in sdata
cudaMemcpyToSymbol(MY_AP(reneigh_flag), & sdata->buffer, sizeof(int*)); //might be moved to a neighbor record in sdata
cudaMemcpyToSymbol(MY_AP(triggerneighsq), & sdata->atom.triggerneighsq, sizeof(X_FLOAT)); //might be moved to a neighbor record in sdata
}
void Cuda_FixNVECuda_UpdateBuffer(cuda_shared_data* sdata)
{
int size = (unsigned)10 * sizeof(int);
if(sdata->buffersize < size) {
MYDBG(printf("Cuda_FixNVECuda Resizing Buffer at %p with %i kB to\n", sdata->buffer, sdata->buffersize);)
CudaWrapper_FreeCudaData(sdata->buffer, sdata->buffersize);
sdata->buffer = CudaWrapper_AllocCudaData(size);
sdata->buffersize = size;
sdata->buffer_new++;
MYDBG(printf("New buffer at %p with %i kB\n", sdata->buffer, sdata->buffersize);)
}
cudaMemcpyToSymbol(MY_AP(buffer) , & sdata->buffer, sizeof(int*));
cudaMemcpyToSymbol(MY_AP(reneigh_flag), & sdata->buffer, sizeof(int*)); //might be moved to a neighbor record in sdata
}
void Cuda_FixNVECuda_Init(cuda_shared_data* sdata, X_FLOAT dtv, V_FLOAT dtf)
{
cudaMemcpyToSymbol(MY_AP(mass) , & sdata->atom.mass.dev_data , sizeof(V_FLOAT*));
cudaMemcpyToSymbol(MY_AP(dtf) , & dtf , sizeof(V_FLOAT));
cudaMemcpyToSymbol(MY_AP(dtv) , & dtv , sizeof(X_FLOAT));
cudaMemcpyToSymbol(MY_AP(triggerneighsq), &sdata->atom.triggerneighsq, sizeof(X_FLOAT));
cudaMemcpyToSymbol(MY_AP(dist_check), & sdata->atom.dist_check , sizeof(int));
cudaMemcpyToSymbol(MY_AP(rmass_flag), & sdata->atom.rmass_flag , sizeof(int)); //
Cuda_FixNVECuda_UpdateNmax(sdata);
}
void Cuda_FixNVECuda_InitialIntegrate(cuda_shared_data* sdata, int groupbit, int mynlocal)//mynlocal can be nfirst if firstgroup==igroup see cpp
{
if(sdata->atom.update_nmax)
Cuda_FixNVECuda_UpdateNmax(sdata);
if(sdata->atom.update_nlocal)
cudaMemcpyToSymbol(MY_AP(nlocal) , & sdata->atom.nlocal , sizeof(int));
if(sdata->buffer_new)
Cuda_FixNVECuda_UpdateBuffer(sdata);
int3 layout = getgrid(mynlocal);
dim3 threads(layout.z, 1, 1);
dim3 grid(layout.x, layout.y, 1);
cudaMemset(sdata->buffer, 0, sizeof(int));
FixNVECuda_InitialIntegrate_Kernel <<< grid, threads>>> (groupbit);
cudaThreadSynchronize();
int reneigh_flag;
cudaMemcpy((void*)(&reneigh_flag), sdata->buffer, sizeof(int), cudaMemcpyDeviceToHost);
sdata->atom.reneigh_flag += reneigh_flag;
CUT_CHECK_ERROR("Cuda_FixNVECuda_InitialIntegrate_N: fix nve initial integrate Kernel execution failed");
}
void Cuda_FixNVECuda_FinalIntegrate(cuda_shared_data* sdata, int groupbit, int mynlocal)//mynlocal can be nfirst if firstgroup==igroup see cpp
{
if(sdata->atom.update_nmax)
Cuda_FixNVECuda_UpdateNmax(sdata);
if(sdata->atom.update_nlocal)
cudaMemcpyToSymbol(MY_AP(nlocal) , & sdata->atom.nlocal , sizeof(int));
if(sdata->buffer_new)
Cuda_FixNVECuda_UpdateBuffer(sdata);
#ifdef CUDA_USE_BINNING
dim3 grid(sdata->domain.bin_dim[0], sdata->domain.bin_dim[1] * sdata->domain.bin_neighbors[2], 1);
dim3 threads(sdata->domain.bin_nmax, 1, 1);
FixNVECuda_FinalIntegrate_Kernel <<< grid, threads>>> (groupbit);
cudaThreadSynchronize();
CUT_CHECK_ERROR("Cuda_FixNVECuda_FinalIntegrate: fix nve final integrate (binning) Kernel execution failed");
#else
int3 layout = getgrid(mynlocal);
dim3 threads(layout.z, 1, 1);
dim3 grid(layout.x, layout.y, 1);
FixNVECuda_FinalIntegrate_Kernel <<< grid, threads>>> (groupbit);
cudaThreadSynchronize();
CUT_CHECK_ERROR("Cuda_FixNVECuda_FinalIntegrate: fix nve final integrate Kernel execution failed");
#endif
}

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