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fix_gravity_cuda.cu
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Tue, Nov 12, 04:36

fix_gravity_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_gravity_cuda
#include "cuda_shared.h"
#include "cuda_common.h"
#include "crm_cuda_utils.cu"
#include "fix_gravity_cuda_cu.h"
#include "fix_gravity_cuda_kernel.cu"
void Cuda_FixGravityCuda_UpdateBuffer(cuda_shared_data* sdata)
{
int3 layout = getgrid(sdata->atom.nlocal, 3 * sizeof(F_FLOAT));
dim3 threads(layout.z, 1, 1);
dim3 grid(layout.x, layout.y, 1);
int size = (unsigned)(layout.z * layout.y * layout.x) * 3 * sizeof(F_FLOAT);
if(sdata->buffersize < size) {
MYDBG(printf("Cuda_FixGravityCuda 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*));
}
void Cuda_FixGravityCuda_UpdateNmax(cuda_shared_data* sdata)
{
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(x) , & sdata->atom.x .dev_data, sizeof(X_FLOAT*));
cudaMemcpyToSymbol(MY_AP(f) , & sdata->atom.f .dev_data, sizeof(F_FLOAT*));
cudaMemcpyToSymbol(MY_AP(type) , & sdata->atom.type .dev_data, sizeof(int*));
cudaMemcpyToSymbol(MY_AP(rmass_flag) , & sdata->atom.rmass_flag, 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*));
}
void Cuda_FixGravityCuda_Init(cuda_shared_data* sdata)
{
Cuda_FixGravityCuda_UpdateNmax(sdata);
}
void Cuda_FixGravityCuda_PostForce(cuda_shared_data* sdata, int groupbit, F_FLOAT xacc, F_FLOAT yacc, F_FLOAT zacc)
{
if(sdata->atom.update_nmax)
Cuda_FixGravityCuda_UpdateNmax(sdata);
if(sdata->atom.update_nlocal)
cudaMemcpyToSymbol(MY_AP(nlocal) , & sdata->atom.nlocal , sizeof(int));
if(sdata->buffer_new)
Cuda_FixGravityCuda_UpdateBuffer(sdata);
int3 layout = getgrid(sdata->atom.nlocal);
dim3 threads(layout.z, 1, 1);
dim3 grid(layout.x, layout.y, 1);
Cuda_FixGravityCuda_PostForce_Kernel <<< grid, threads>>> (groupbit, xacc, yacc, zacc);
cudaThreadSynchronize();
CUT_CHECK_ERROR("Cuda_Cuda_FixGravityCuda_PostForce: fix add_force post_force compute Kernel execution failed");
}

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