forked from lijiext/lammps
83 lines
2.4 KiB
Plaintext
83 lines
2.4 KiB
Plaintext
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/* ----------------------------------------------------------------------
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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_FixFreezeCuda_PostForce_Kernel(int groupbit)
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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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_f[i] = F_F(0.0);
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_f[i+1*_nmax] = F_F(0.0);
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_f[i+2*_nmax] = F_F(0.0);
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_torque[i] = F_F(0.0);
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_torque[i+1*_nmax] = F_F(0.0);
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_torque[i+2*_nmax] = F_F(0.0);
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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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{
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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_FixFreezeCuda_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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{
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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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