forked from lijiext/lammps
87 lines
2.5 KiB
Plaintext
87 lines
2.5 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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extern __shared__ F_FLOAT sharedmem[];
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__global__ void Cuda_FixSetForceCuda_PostForce_Kernel(int groupbit, F_FLOAT xvalue, F_FLOAT yvalue, F_FLOAT zvalue, int flagx, int flagy, int flagz)
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{
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int i = (blockIdx.x * gridDim.y + blockIdx.y) * blockDim.x + threadIdx.x;
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sharedmem[threadIdx.x] = 0;
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sharedmem[threadIdx.x + blockDim.x] = 0;
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sharedmem[threadIdx.x + 2 * blockDim.x] = 0;
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if(i < _nlocal)
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if(_mask[i] & groupbit) {
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sharedmem[threadIdx.x] = _f[i];
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sharedmem[threadIdx.x + blockDim.x] = _f[i + 1 * _nmax];
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sharedmem[threadIdx.x + 2 * blockDim.x] = _f[i + 2 * _nmax];
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if(flagx) _f[i] = xvalue;
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if(flagy) _f[i + 1 * _nmax] = yvalue;
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if(flagz) _f[i + 2 * _nmax] = zvalue;
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}
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reduceBlock(sharedmem);
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reduceBlock(&sharedmem[blockDim.x]);
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reduceBlock(&sharedmem[2 * blockDim.x]);
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F_FLOAT* buffer = (F_FLOAT*)_buffer;
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if(threadIdx.x == 0) {
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buffer[blockIdx.x * gridDim.y + blockIdx.y] = sharedmem[0];
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buffer[blockIdx.x * gridDim.y + blockIdx.y + gridDim.x * gridDim.y] = sharedmem[blockDim.x];
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buffer[blockIdx.x * gridDim.y + blockIdx.y + 2 * gridDim.x * gridDim.y] = sharedmem[2 * blockDim.x];
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}
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}
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__global__ void Cuda_FixSetForceCuda_Reduce_FOriginal(int n, F_FLOAT* foriginal)
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{
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int i = 0;
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sharedmem[threadIdx.x] = 0;
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F_FLOAT myforig = 0.0;
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F_FLOAT* buf = (F_FLOAT*)_buffer;
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buf = &buf[blockIdx.x * n];
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while(i < n) {
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sharedmem[threadIdx.x] = 0;
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if(i + threadIdx.x < n)
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sharedmem[threadIdx.x] = buf[i + threadIdx.x];
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__syncthreads();
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reduceBlock(sharedmem);
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i += blockDim.x;
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if(threadIdx.x == 0)
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myforig += sharedmem[0];
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}
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if(threadIdx.x == 0)
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foriginal[blockIdx.x] = myforig;
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}
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