321 lines
11 KiB
C++
321 lines
11 KiB
C++
/* ----------------------------------------------------------------------
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LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
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http://lammps.sandia.gov, Sandia National Laboratories
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Steve Plimpton, sjplimp@sandia.gov
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Copyright (2003) Sandia Corporation. Under the terms of Contract
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DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
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certain rights in this software. This software is distributed under
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the GNU General Public License.
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See the README file in the top-level LAMMPS directory.
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------------------------------------------------------------------------- */
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#include "fix_gpu.h"
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#include <cstring>
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#include "atom.h"
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#include "force.h"
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#include "pair.h"
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#include "pair_hybrid.h"
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#include "pair_hybrid_overlay.h"
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#include "respa.h"
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#include "input.h"
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#include "timer.h"
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#include "modify.h"
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#include "update.h"
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#include "domain.h"
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#include "universe.h"
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#include "gpu_extra.h"
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#include "neighbor.h"
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#include "citeme.h"
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#include "error.h"
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using namespace LAMMPS_NS;
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using namespace FixConst;
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enum{GPU_FORCE, GPU_NEIGH, GPU_HYB_NEIGH};
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extern int lmp_init_device(MPI_Comm world, MPI_Comm replica,
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const int first_gpu, const int last_gpu,
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const int gpu_mode, const double particle_split,
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const int nthreads, const int t_per_atom,
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const double cell_size, char *opencl_flags,
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const int block_pair);
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extern void lmp_clear_device();
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extern double lmp_gpu_forces(double **f, double **tor, double *eatom,
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double **vatom, double *virial, double &ecoul);
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static const char cite_gpu_package[] =
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"GPU package (short-range, long-range and three-body potentials):\n\n"
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"@Article{Brown11,\n"
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" author = {W. M. Brown, P. Wang, S. J. Plimpton, A. N. Tharrington},\n"
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" title = {Implementing Molecular Dynamics on Hybrid High Performance Computers - Short Range Forces},\n"
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" journal = {Comp.~Phys.~Comm.},\n"
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" year = 2011,\n"
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" volume = 182,\n"
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" pages = {898--911}\n"
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"}\n\n"
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"@Article{Brown12,\n"
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" author = {W. M. Brown, A. Kohlmeyer, S. J. Plimpton, A. N. Tharrington},\n"
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" title = {Implementing Molecular Dynamics on Hybrid High Performance Computers - Particle-Particle Particle-Mesh},\n"
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" journal = {Comp.~Phys.~Comm.},\n"
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" year = 2012,\n"
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" volume = 183,\n"
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" pages = {449--459}\n"
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"}\n\n"
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"@Article{Brown13,\n"
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" author = {W. M. Brown, Y. Masako},\n"
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" title = {Implementing Molecular Dynamics on Hybrid High Performance Computers – Three-Body Potentials},\n"
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" journal = {Comp.~Phys.~Comm.},\n"
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" year = 2013,\n"
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" volume = 184,\n"
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" pages = {2785--2793}\n"
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"}\n\n"
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"@Article{Trung15,\n"
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" author = {T. D. Nguyen, S. J. Plimpton},\n"
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" title = {Accelerating dissipative particle dynamics simulations for soft matter systems},\n"
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" journal = {Comput.~Mater.~Sci.},\n"
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" year = 2015,\n"
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" volume = 100,\n"
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" pages = {173--180}\n"
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"}\n\n"
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"@Article{Trung17,\n"
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" author = {T. D. Nguyen},\n"
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" title = {GPU-accelerated Tersoff potentials for massively parallel Molecular Dynamics simulations},\n"
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" journal = {Comp.~Phys.~Comm.},\n"
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" year = 2017,\n"
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" volume = 212,\n"
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" pages = {113--122}\n"
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"}\n\n"
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"@Article{Nikolskiy19,\n"
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" author = {V. Nikolskiy, V. Stegailov},\n"
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" title = {GPU acceleration of four-site water models in LAMMPS},\n"
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" journal = {Proceeding of the International Conference on Parallel Computing (ParCo 2019), Prague, Czech Republic},\n"
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" year = 2019\n"
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"}\n\n";
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/* ---------------------------------------------------------------------- */
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FixGPU::FixGPU(LAMMPS *lmp, int narg, char **arg) :
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Fix(lmp, narg, arg)
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{
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if (lmp->citeme) lmp->citeme->add(cite_gpu_package);
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if (narg < 4) error->all(FLERR,"Illegal package gpu command");
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int ngpu = atoi(arg[3]);
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if (ngpu <= 0) error->all(FLERR,"Illegal package gpu command");
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int first_gpu = 0;
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int last_gpu = ngpu-1;
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// options
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_gpu_mode = GPU_NEIGH;
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_particle_split = 1.0;
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int nthreads = 1;
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int newtonflag = 0;
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int threads_per_atom = -1;
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double binsize = 0.0;
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char *opencl_flags = nullptr;
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int block_pair = -1;
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int iarg = 4;
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while (iarg < narg) {
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if (strcmp(arg[iarg],"neigh") == 0) {
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if (iarg+2 > narg) error->all(FLERR,"Illegal package gpu command");
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if (strcmp(arg[iarg+1],"yes") == 0) _gpu_mode = GPU_NEIGH;
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else if (strcmp(arg[iarg+1],"no") == 0) _gpu_mode = GPU_FORCE;
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else if (strcmp(arg[iarg+1],"hybrid") == 0) _gpu_mode = GPU_HYB_NEIGH;
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else error->all(FLERR,"Illegal package gpu command");
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iarg += 2;
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} else if (strcmp(arg[iarg],"newton") == 0) {
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if (iarg+2 > narg) error->all(FLERR,"Illegal package gpu command");
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if (strcmp(arg[iarg+1],"off") == 0) newtonflag = 0;
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else if (strcmp(arg[iarg+1],"on") == 0) newtonflag = 1;
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else error->all(FLERR,"Illegal package gpu command");
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iarg += 2;
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} else if (strcmp(arg[iarg],"binsize") == 0) {
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if (iarg+2 > narg) error->all(FLERR,"Illegal package gpu command");
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binsize = utils::numeric(FLERR,arg[iarg+1],false,lmp);
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if (binsize <= 0.0) error->all(FLERR,"Illegal fix GPU command");
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iarg += 2;
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} else if (strcmp(arg[iarg],"split") == 0) {
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if (iarg+2 > narg) error->all(FLERR,"Illegal package gpu command");
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_particle_split = utils::numeric(FLERR,arg[iarg+1],false,lmp);
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if (_particle_split == 0.0 || _particle_split > 1.0)
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error->all(FLERR,"Illegal package GPU command");
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iarg += 2;
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} else if (strcmp(arg[iarg],"gpuID") == 0) {
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if (iarg+3 > narg) error->all(FLERR,"Illegal package gpu command");
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first_gpu = utils::inumeric(FLERR,arg[iarg+1],false,lmp);
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last_gpu = utils::inumeric(FLERR,arg[iarg+2],false,lmp);
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iarg += 3;
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} else if (strcmp(arg[iarg],"tpa") == 0) {
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if (iarg+2 > narg) error->all(FLERR,"Illegal package gpu command");
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threads_per_atom = utils::inumeric(FLERR,arg[iarg+1],false,lmp);
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iarg += 2;
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} else if (strcmp(arg[iarg],"nthreads") == 0) {
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if (iarg+2 > narg) error->all(FLERR,"Illegal package gpu command");
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nthreads = utils::inumeric(FLERR,arg[iarg+1],false,lmp);
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if (nthreads < 1) error->all(FLERR,"Illegal fix GPU command");
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iarg += 2;
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} else if (strcmp(arg[iarg],"device") == 0) {
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if (iarg+2 > narg) error->all(FLERR,"Illegal package gpu command");
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opencl_flags = arg[iarg+1];
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iarg += 2;
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} else if (strcmp(arg[iarg],"blocksize") == 0) {
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if (iarg+2 > narg) error->all(FLERR,"Illegal package gpu command");
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block_pair = utils::inumeric(FLERR,arg[iarg+1],false,lmp);
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iarg += 2;
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} else error->all(FLERR,"Illegal package gpu command");
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}
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#ifndef _OPENMP
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if (nthreads > 1)
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error->all(FLERR,"No OpenMP support compiled in");
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#endif
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// set newton pair flag
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// require newtonflag = 0 since currently required by all GPU pair styles
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if (newtonflag == 1) error->all(FLERR,"Illegal package gpu command");
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force->newton_pair = newtonflag;
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if (force->newton_pair || force->newton_bond) force->newton = 1;
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else force->newton = 0;
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// pass params to GPU library
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// change binsize default (0.0) to -1.0 used by GPU lib
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if (binsize == 0.0) binsize = -1.0;
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int gpu_flag = lmp_init_device(universe->uworld, world, first_gpu, last_gpu,
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_gpu_mode, _particle_split, nthreads,
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threads_per_atom, binsize, opencl_flags,
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block_pair);
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GPU_EXTRA::check_flag(gpu_flag,error,world);
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}
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/* ---------------------------------------------------------------------- */
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FixGPU::~FixGPU()
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{
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lmp_clear_device();
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}
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/* ---------------------------------------------------------------------- */
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int FixGPU::setmask()
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{
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int mask = 0;
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mask |= POST_FORCE;
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mask |= MIN_POST_FORCE;
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mask |= POST_FORCE_RESPA;
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return mask;
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}
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/* ---------------------------------------------------------------------- */
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void FixGPU::init()
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{
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// GPU package cannot be used with atom_style template
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if (atom->molecular == Atom::TEMPLATE)
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error->all(FLERR,"GPU package does not (yet) work with "
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"atom_style template");
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// give a warning if no pair style is defined
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if (!force->pair)
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error->warning(FLERR,"Using package gpu without any pair style defined");
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// make sure fdotr virial is not accumulated multiple times
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if (force->pair_match("^hybrid",0) != nullptr) {
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PairHybrid *hybrid = (PairHybrid *) force->pair;
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for (int i = 0; i < hybrid->nstyles; i++)
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if (!utils::strmatch(hybrid->keywords[i],"/gpu$"))
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force->pair->no_virial_fdotr_compute = 1;
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}
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// rRESPA support
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if (utils::strmatch(update->integrate_style,"^respa"))
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_nlevels_respa = ((Respa *) update->integrate)->nlevels;
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}
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/* ---------------------------------------------------------------------- */
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void FixGPU::setup(int vflag)
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{
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if (_gpu_mode == GPU_NEIGH || _gpu_mode == GPU_HYB_NEIGH)
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if (neighbor->exclude_setting()!=0)
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error->all(FLERR,
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"Cannot use neigh_modify exclude with GPU neighbor builds");
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if (strstr(update->integrate_style,"verlet")) post_force(vflag);
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else {
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// In setup only, all forces calculated on GPU are put in the outer level
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((Respa *) update->integrate)->copy_flevel_f(_nlevels_respa-1);
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post_force(vflag);
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((Respa *) update->integrate)->copy_f_flevel(_nlevels_respa-1);
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}
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}
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/* ---------------------------------------------------------------------- */
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void FixGPU::min_setup(int vflag)
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{
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post_force(vflag);
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}
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/* ---------------------------------------------------------------------- */
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void FixGPU::post_force(int /* vflag */)
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{
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if (!force->pair) return;
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timer->stamp();
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double lvirial[6];
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for (int i = 0; i < 6; i++) lvirial[i] = 0.0;
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double my_eng = lmp_gpu_forces(atom->f, atom->torque, force->pair->eatom,
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force->pair->vatom, lvirial,
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force->pair->eng_coul);
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force->pair->eng_vdwl += my_eng;
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force->pair->virial[0] += lvirial[0];
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force->pair->virial[1] += lvirial[1];
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force->pair->virial[2] += lvirial[2];
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force->pair->virial[3] += lvirial[3];
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force->pair->virial[4] += lvirial[4];
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force->pair->virial[5] += lvirial[5];
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if (force->pair->vflag_fdotr) force->pair->virial_fdotr_compute();
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timer->stamp(Timer::PAIR);
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}
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/* ---------------------------------------------------------------------- */
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void FixGPU::min_post_force(int vflag)
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{
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post_force(vflag);
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}
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/* ---------------------------------------------------------------------- */
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void FixGPU::post_force_respa(int vflag, int /* ilevel */, int /* iloop */)
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{
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post_force(vflag);
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}
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/* ---------------------------------------------------------------------- */
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double FixGPU::memory_usage()
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{
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double bytes = 0.0;
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// memory usage currently returned by pair routine
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return bytes;
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}
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