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kernel_gpu_cuda.cu
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kernel_gpu_cuda.cu
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//----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------200
// plasmaKernel_gpu_2
//----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------200
__global__ void kernel_gpu_cuda(par_str d_par_gpu,
dim_str d_dim_gpu,
box_str* d_box_gpu,
FOUR_VECTOR* d_rv_gpu,
fp* d_qv_gpu,
FOUR_VECTOR* d_fv_gpu)
{
//--------------------------------------------------------------------------------------------------------------------------------------------------------------------------180
// THREAD PARAMETERS
//--------------------------------------------------------------------------------------------------------------------------------------------------------------------------180
int bx = blockIdx.x; // get current horizontal block index (0-n)
int tx = threadIdx.x; // get current horizontal thread index (0-n)
// int ax = bx*NUMBER_THREADS+tx;
// int wbx = bx;
int wtx = tx;
//--------------------------------------------------------------------------------------------------------------------------------------------------------------------------180
// DO FOR THE NUMBER OF BOXES
//--------------------------------------------------------------------------------------------------------------------------------------------------------------------------180
if(bx<d_dim_gpu.number_boxes){
// while(wbx<box_indexes_counter){
//------------------------------------------------------------------------------------------------------------------------------------------------------160
// Extract input parameters
//------------------------------------------------------------------------------------------------------------------------------------------------------160
// parameters
fp a2 = 2.0*d_par_gpu.alpha*d_par_gpu.alpha;
// home box
int first_i;
FOUR_VECTOR* rA;
FOUR_VECTOR* fA;
__shared__ FOUR_VECTOR rA_shared[100];
// nei box
int pointer;
int k = 0;
int first_j;
FOUR_VECTOR* rB;
fp* qB;
int j = 0;
__shared__ FOUR_VECTOR rB_shared[100];
__shared__ double qB_shared[100];
// common
fp r2;
fp u2;
fp vij;
fp fs;
fp fxij;
fp fyij;
fp fzij;
THREE_VECTOR d;
//------------------------------------------------------------------------------------------------------------------------------------------------------160
// Home box
//------------------------------------------------------------------------------------------------------------------------------------------------------160
//----------------------------------------------------------------------------------------------------------------------------------140
// Setup parameters
//----------------------------------------------------------------------------------------------------------------------------------140
// home box - box parameters
first_i = d_box_gpu[bx].offset;
// home box - distance, force, charge and type parameters
rA = &d_rv_gpu[first_i];
fA = &d_fv_gpu[first_i];
//----------------------------------------------------------------------------------------------------------------------------------140
// Copy to shared memory
//----------------------------------------------------------------------------------------------------------------------------------140
// home box - shared memory
while(wtx<NUMBER_PAR_PER_BOX){
rA_shared[wtx] = rA[wtx];
wtx = wtx + NUMBER_THREADS;
}
wtx = tx;
// synchronize threads - not needed, but just to be safe
__syncthreads();
//------------------------------------------------------------------------------------------------------------------------------------------------------160
// nei box loop
//------------------------------------------------------------------------------------------------------------------------------------------------------160
// loop over neiing boxes of home box
for (k=0; k<(1+d_box_gpu[bx].nn); k++){
//----------------------------------------50
// nei box - get pointer to the right box
//----------------------------------------50
if(k==0){
pointer = bx; // set first box to be processed to home box
}
else{
pointer = d_box_gpu[bx].nei[k-1].number; // remaining boxes are nei boxes
}
//----------------------------------------------------------------------------------------------------------------------------------140
// Setup parameters
//----------------------------------------------------------------------------------------------------------------------------------140
// nei box - box parameters
first_j = d_box_gpu[pointer].offset;
// nei box - distance, (force), charge and (type) parameters
rB = &d_rv_gpu[first_j];
qB = &d_qv_gpu[first_j];
//----------------------------------------------------------------------------------------------------------------------------------140
// Setup parameters
//----------------------------------------------------------------------------------------------------------------------------------140
// nei box - shared memory
while(wtx<NUMBER_PAR_PER_BOX){
rB_shared[wtx] = rB[wtx];
qB_shared[wtx] = qB[wtx];
wtx = wtx + NUMBER_THREADS;
}
wtx = tx;
// synchronize threads because in next section each thread accesses data brought in by different threads here
__syncthreads();
//----------------------------------------------------------------------------------------------------------------------------------140
// Calculation
//----------------------------------------------------------------------------------------------------------------------------------140
// loop for the number of particles in the home box
// for (int i=0; i<nTotal_i; i++){
while(wtx<NUMBER_PAR_PER_BOX){
// loop for the number of particles in the current nei box
for (j=0; j<NUMBER_PAR_PER_BOX; j++){
// r2 = rA[wtx].v + rB[j].v - DOT(rA[wtx],rB[j]);
// u2 = a2*r2;
// vij= exp(-u2);
// fs = 2.*vij;
// d.x = rA[wtx].x - rB[j].x;
// fxij=fs*d.x;
// d.y = rA[wtx].y - rB[j].y;
// fyij=fs*d.y;
// d.z = rA[wtx].z - rB[j].z;
// fzij=fs*d.z;
// fA[wtx].v += qB[j]*vij;
// fA[wtx].x += qB[j]*fxij;
// fA[wtx].y += qB[j]*fyij;
// fA[wtx].z += qB[j]*fzij;
r2 = (fp)rA_shared[wtx].v + (fp)rB_shared[j].v - DOT((fp)rA_shared[wtx],(fp)rB_shared[j]);
u2 = a2*r2;
vij= exp(-u2);
fs = 2*vij;
d.x = (fp)rA_shared[wtx].x - (fp)rB_shared[j].x;
fxij=fs*d.x;
d.y = (fp)rA_shared[wtx].y - (fp)rB_shared[j].y;
fyij=fs*d.y;
d.z = (fp)rA_shared[wtx].z - (fp)rB_shared[j].z;
fzij=fs*d.z;
fA[wtx].v += (double)((fp)qB_shared[j]*vij);
fA[wtx].x += (double)((fp)qB_shared[j]*fxij);
fA[wtx].y += (double)((fp)qB_shared[j]*fyij);
fA[wtx].z += (double)((fp)qB_shared[j]*fzij);
}
// increment work thread index
wtx = wtx + NUMBER_THREADS;
}
// reset work index
wtx = tx;
// synchronize after finishing force contributions from current nei box not to cause conflicts when starting next box
__syncthreads();
//----------------------------------------------------------------------------------------------------------------------------------140
// Calculation END
//----------------------------------------------------------------------------------------------------------------------------------140
}
// // increment work block index
// wbx = wbx + NUMBER_BLOCKS;
// // synchronize - because next iteration will overwrite current shared memory
// __syncthreads();
//------------------------------------------------------------------------------------------------------------------------------------------------------160
// nei box loop END
//------------------------------------------------------------------------------------------------------------------------------------------------------160
}
}