2016-04-08 05:10:37 +08:00
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/***************************************************************************
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tersoff_zbl_ext.cpp
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-------------------
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Trung Dac Nguyen
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Functions for LAMMPS access to tersoff/zbl acceleration routines.
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__________________________________________________________________________
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This file is part of the LAMMPS Accelerator Library (LAMMPS_AL)
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__________________________________________________________________________
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begin :
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email : ndactrung@gmail.com
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***************************************************************************/
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#include <iostream>
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#include <cassert>
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#include <math.h>
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#include "lal_tersoff_zbl.h"
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using namespace std;
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using namespace LAMMPS_AL;
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static TersoffZBL<PRECISION,ACC_PRECISION> TSZMF;
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// ---------------------------------------------------------------------------
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// Allocate memory on host and device and copy constants to device
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// ---------------------------------------------------------------------------
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int tersoff_zbl_gpu_init(const int ntypes, const int inum, const int nall,
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const int max_nbors, const double cell_size, int &gpu_mode,
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FILE *screen, int* host_map, const int nelements,
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int*** host_elem2param, const int nparams,
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const double* ts_lam1, const double* ts_lam2,
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const double* ts_lam3, const double* ts_powermint,
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const double* ts_biga, const double* ts_bigb,
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const double* ts_bigr, const double* ts_bigd,
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const double* ts_c1, const double* ts_c2,
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const double* ts_c3, const double* ts_c4,
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const double* ts_c, const double* ts_d, const double* ts_h,
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const double* ts_gamma, const double* ts_beta,
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const double* ts_powern, const double* ts_Z_i,
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const double* ts_Z_j, const double* ts_ZBLcut,
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const double* ts_ZBLexpscale, const double global_e,
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const double global_a_0, const double global_epsilon_0,
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const double* ts_cutsq) {
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TSZMF.clear();
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gpu_mode=TSZMF.device->gpu_mode();
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double gpu_split=TSZMF.device->particle_split();
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int first_gpu=TSZMF.device->first_device();
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int last_gpu=TSZMF.device->last_device();
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int world_me=TSZMF.device->world_me();
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int gpu_rank=TSZMF.device->gpu_rank();
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int procs_per_gpu=TSZMF.device->procs_per_gpu();
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// disable host/device split for now
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if (gpu_split != 1.0)
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return -8;
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TSZMF.device->init_message(screen,"tersoff/zbl/gpu",first_gpu,last_gpu);
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bool message=false;
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if (TSZMF.device->replica_me()==0 && screen)
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message=true;
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if (message) {
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fprintf(screen,"Initializing Device and compiling on process 0...");
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fflush(screen);
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}
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int init_ok=0;
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if (world_me==0)
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init_ok=TSZMF.init(ntypes, inum, nall, 300, cell_size, gpu_split, screen,
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host_map, nelements, host_elem2param, nparams,
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ts_lam1, ts_lam2, ts_lam3, ts_powermint,
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ts_biga, ts_bigb, ts_bigr, ts_bigd,
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ts_c1, ts_c2, ts_c3, ts_c4, ts_c, ts_d, ts_h,
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ts_gamma, ts_beta, ts_powern, ts_Z_i, ts_Z_j,
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ts_ZBLcut, ts_ZBLexpscale, global_e, global_a_0,
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global_epsilon_0, ts_cutsq);
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TSZMF.device->world_barrier();
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if (message)
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fprintf(screen,"Done.\n");
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for (int i=0; i<procs_per_gpu; i++) {
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if (message) {
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if (last_gpu-first_gpu==0)
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fprintf(screen,"Initializing Device %d on core %d...",first_gpu,i);
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else
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fprintf(screen,"Initializing Devices %d-%d on core %d...",first_gpu,
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last_gpu,i);
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fflush(screen);
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}
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if (gpu_rank==i && world_me!=0)
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init_ok=TSZMF.init(ntypes, inum, nall, 300, cell_size, gpu_split, screen,
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host_map, nelements, host_elem2param, nparams,
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ts_lam1, ts_lam2, ts_lam3, ts_powermint,
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ts_biga, ts_bigb, ts_bigr, ts_bigd,
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ts_c1, ts_c2, ts_c3, ts_c4, ts_c, ts_d, ts_h,
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ts_gamma, ts_beta, ts_powern, ts_Z_i, ts_Z_j,
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ts_ZBLcut, ts_ZBLexpscale, global_e, global_a_0,
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global_epsilon_0, ts_cutsq);
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TSZMF.device->gpu_barrier();
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if (message)
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fprintf(screen,"Done.\n");
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}
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if (message)
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fprintf(screen,"\n");
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if (init_ok==0)
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TSZMF.estimate_gpu_overhead();
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return init_ok;
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}
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void tersoff_zbl_gpu_clear() {
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TSZMF.clear();
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}
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int ** tersoff_zbl_gpu_compute_n(const int ago, const int inum_full,
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const int nall, double **host_x, int *host_type,
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double *sublo, double *subhi, tagint *tag, int **nspecial,
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tagint **special, const bool eflag, const bool vflag,
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const bool eatom, const bool vatom, int &host_start,
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int **ilist, int **jnum, const double cpu_time,
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bool &success) {
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return TSZMF.compute(ago, inum_full, nall, host_x, host_type, sublo,
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subhi, tag, nspecial, special, eflag, vflag, eatom,
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vatom, host_start, ilist, jnum, cpu_time, success);
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}
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2016-07-02 07:27:26 +08:00
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2016-04-08 05:10:37 +08:00
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void tersoff_zbl_gpu_compute(const int ago, const int nlocal, const int nall,
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const int nlist, double **host_x, int *host_type,
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int *ilist, int *numj, int **firstneigh, const bool eflag,
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const bool vflag, const bool eatom, const bool vatom,
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int &host_start, const double cpu_time, bool &success) {
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TSZMF.compute(ago,nlocal,nall,nlist,host_x,host_type,ilist,numj,
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firstneigh,eflag,vflag,eatom,vatom,host_start,cpu_time,success);
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}
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double tersoff_zbl_gpu_bytes() {
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return TSZMF.host_memory_usage();
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}
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