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Added command line description of MD-Bench, added memory transfer rate from CPU to GPU to force.cu

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Maximilian Gaul 2021-11-23 15:55:23 +01:00
parent 0586ef150a
commit 8f723c1299
1 changed files with 6 additions and 0 deletions
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6
src/force.cu
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@ -163,8 +163,14 @@ double computeForce(
checkError( "c_atom.cutforcesq memcpy", cudaMemcpy(c_atom.cutforcesq, atom->cutforcesq, sizeof(MD_FLOAT) * atom->ntypes * atom->ntypes, cudaMemcpyHostToDevice) );
int *c_neighs;
double start_memory_bandwidth = getTimeStamp();
checkError( "c_neighs malloc", cudaMalloc((void**)&c_neighs, sizeof(int) * Nlocal * neighbor->maxneighs) );
checkError( "c_neighs memcpy", cudaMemcpy(c_neighs, neighbor->neighbors, sizeof(int) * Nlocal * neighbor->maxneighs, cudaMemcpyHostToDevice) );
double end_memory_bandwidth = getTimeStamp();
double memory_bandwith_time = (end_memory_bandwidth - start_memory_bandwidth);
const unsigned long bytes = sizeof(int) * Nlocal * neighbor->maxneighs;
const double gb_per_second = ((double)bytes / memory_bandwith_time) / 1024.0 / 1024.0 / 1024.0;
printf("Data transfer of %lu bytes took %fs => %f GB/s\r\n", bytes, memory_bandwith_time, gb_per_second);
int *c_neigh_numneigh;
checkError( "c_neigh_numneigh malloc", cudaMalloc((void**)&c_neigh_numneigh, sizeof(int) * Nlocal) );