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kokkos.cpp
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Sat, Nov 2, 21:49

kokkos.cpp
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/* ----------------------------------------------------------------------
LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
http://lammps.sandia.gov, Sandia National Laboratories
Steve Plimpton, sjplimp@sandia.gov
Copyright (2003) Sandia Corporation. Under the terms of Contract
DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
certain rights in this software. This software is distributed under
the GNU General Public License.
See the README file in the top-level LAMMPS directory.
------------------------------------------------------------------------- */
#include "stdio.h"
#include "string.h"
#include "stdlib.h"
#include "ctype.h"
#include "kokkos.h"
#include "lammps.h"
#include "force.h"
#include "neighbor_kokkos.h"
#include "neigh_list_kokkos.h"
#include "error.h"
using namespace LAMMPS_NS;
/* ---------------------------------------------------------------------- */
KokkosLMP::KokkosLMP(LAMMPS *lmp, int narg, char **arg) : Pointers(lmp)
{
kokkos_exists = 1;
lmp->kokkos = this;
// process any command-line args that invoke Kokkos settings
int device = 0;
num_threads = 1;
numa = 1;
int iarg = 0;
while (iarg < narg) {
if (strcmp(arg[iarg],"d") == 0 || strcmp(arg[iarg],"device") == 0) {
if (iarg+2 > narg) error->all(FLERR,"Invalid Kokkos command-line args");
device = atoi(arg[iarg+1]);
iarg += 2;
} else if (strcmp(arg[iarg],"g") == 0 ||
strcmp(arg[iarg],"gpus") == 0) {
if (iarg+2 > narg) error->all(FLERR,"Invalid Kokkos command-line args");
int ngpu = atoi(arg[iarg+1]);
int skip_gpu = 9999;
if (iarg+2 < narg && isdigit(arg[iarg+2][0])) {
skip_gpu = atoi(arg[iarg+2]);
iarg++;
}
iarg += 2;
char *str;
if (str = getenv("SLURM_LOCALID")) {
int local_rank = atoi(str);
device = local_rank % ngpu;
if (device >= skip_gpu) device++;
}
if (str = getenv("MV2_COMM_WORLD_LOCAL_RANK")) {
int local_rank = atoi(str);
device = local_rank % ngpu;
if (device >= skip_gpu) device++;
}
if (str = getenv("OMPI_COMM_WORLD_LOCAL_RANK")) {
int local_rank = atoi(str);
device = local_rank % ngpu;
if (device >= skip_gpu) device++;
}
} else if (strcmp(arg[iarg],"t") == 0 ||
strcmp(arg[iarg],"threads") == 0) {
num_threads = atoi(arg[iarg+1]);
iarg += 2;
} else if (strcmp(arg[iarg],"n") == 0 ||
strcmp(arg[iarg],"numa") == 0) {
numa = atoi(arg[iarg+1]);
iarg += 2;
} else error->all(FLERR,"Invalid Kokkos command-line args");
}
// initialize Kokkos
#ifdef KOKKOS_HAVE_CUDA
Kokkos::Cuda::host_mirror_device_type::initialize(num_threads,numa);
Kokkos::Cuda::SelectDevice select_device(device);
Kokkos::Cuda::initialize(select_device);
#else
LMPHostType::initialize(num_threads,numa);
#endif
// default settings for package kokkos command
neighflag = FULL;
exchange_comm_classic = 0;
forward_comm_classic = 0;
exchange_comm_on_host = 1;
forward_comm_on_host = 1;
}
/* ---------------------------------------------------------------------- */
KokkosLMP::~KokkosLMP()
{
// finalize Kokkos
#ifdef KOKKOS_HAVE_CUDA
Kokkos::Cuda::finalize();
Kokkos::Cuda::host_mirror_device_type::finalize();
#else
LMPHostType::finalize();
#endif
}
/* ----------------------------------------------------------------------
invoked by package kokkos command
------------------------------------------------------------------------- */
void KokkosLMP::accelerator(int narg, char **arg)
{
// defaults
neighflag = FULL;
int newtonflag = 0;
double binsize = 0.0;
exchange_comm_classic = forward_comm_classic = 0;
exchange_comm_on_host = forward_comm_on_host = 1;
int iarg = 0;
while (iarg < narg) {
if (strcmp(arg[iarg],"neigh") == 0) {
if (iarg+2 > narg) error->all(FLERR,"Illegal package kokkos command");
if (strcmp(arg[iarg+1],"full") == 0) neighflag = FULL;
else if (strcmp(arg[iarg+1],"half/thread") == 0) neighflag = HALFTHREAD;
else if (strcmp(arg[iarg+1],"half") == 0) neighflag = HALF;
else if (strcmp(arg[iarg+1],"n2") == 0) neighflag = N2;
else if (strcmp(arg[iarg+1],"full/cluster") == 0) neighflag = FULLCLUSTER;
else error->all(FLERR,"Illegal package kokkos command");
iarg += 2;
} else if (strcmp(arg[iarg],"binsize") == 0) {
if (iarg+2 > narg) error->all(FLERR,"Illegal package kokkos command");
binsize = force->numeric(FLERR,arg[iarg+1]);
iarg += 2;
} else if (strcmp(arg[iarg],"newton") == 0) {
if (iarg+2 > narg) error->all(FLERR,"Illegal package kokkos command");
if (strcmp(arg[iarg+1],"off") == 0) newtonflag = 0;
else if (strcmp(arg[iarg+1],"on") == 0) newtonflag = 1;
else error->all(FLERR,"Illegal package kokkos command");
iarg += 2;
} else if (strcmp(arg[iarg],"comm") == 0) {
if (iarg+2 > narg) error->all(FLERR,"Illegal package kokkos command");
if (strcmp(arg[iarg+1],"no") == 0) {
exchange_comm_classic = forward_comm_classic = 1;
} else if (strcmp(arg[iarg+1],"host") == 0) {
exchange_comm_classic = forward_comm_classic = 0;
exchange_comm_on_host = forward_comm_on_host = 1;
} else if (strcmp(arg[iarg+1],"device") == 0) {
exchange_comm_classic = forward_comm_classic = 0;
exchange_comm_on_host = forward_comm_on_host = 0;
} else error->all(FLERR,"Illegal package kokkos command");
iarg += 2;
} else if (strcmp(arg[iarg],"comm/exchange") == 0) {
if (iarg+2 > narg) error->all(FLERR,"Illegal package kokkos command");
if (strcmp(arg[iarg+1],"no") == 0) exchange_comm_classic = 1;
else if (strcmp(arg[iarg+1],"host") == 0) {
exchange_comm_classic = 0;
exchange_comm_on_host = 1;
} else if (strcmp(arg[iarg+1],"device") == 0) {
exchange_comm_classic = 0;
exchange_comm_on_host = 0;
} else error->all(FLERR,"Illegal package kokkos command");
iarg += 2;
} else if (strcmp(arg[iarg],"comm/forward") == 0) {
if (iarg+2 > narg) error->all(FLERR,"Illegal package kokkos command");
if (strcmp(arg[iarg+1],"no") == 0) forward_comm_classic = 1;
else if (strcmp(arg[iarg+1],"host") == 0) {
forward_comm_classic = 0;
forward_comm_on_host = 1;
} else if (strcmp(arg[iarg+1],"device") == 0) {
forward_comm_classic = 0;
forward_comm_on_host = 0;
} else error->all(FLERR,"Illegal package kokkos command");
iarg += 2;
} else error->all(FLERR,"Illegal package kokkos command");
}
// set newton flags
// set neighbor binsize, same as neigh_modify command
force->newton = force->newton_pair = force->newton_bond = newtonflag;
neighbor->binsize_user = binsize;
if (binsize <= 0.0) neighbor->binsizeflag = 0;
else neighbor->binsizeflag = 1;
}
/* ----------------------------------------------------------------------
called by Finish
------------------------------------------------------------------------- */
int KokkosLMP::neigh_list_kokkos(int m)
{
NeighborKokkos *nk = (NeighborKokkos *) neighbor;
if (nk->lists_host[m] && nk->lists_host[m]->d_numneigh.dimension_0())
return 1;
if (nk->lists_device[m] && nk->lists_device[m]->d_numneigh.dimension_0())
return 1;
return 0;
}
/* ----------------------------------------------------------------------
called by Finish
------------------------------------------------------------------------- */
int KokkosLMP::neigh_count(int m)
{
int inum;
int nneigh = 0;
ArrayTypes<LMPHostType>::t_int_1d h_ilist;
ArrayTypes<LMPHostType>::t_int_1d h_numneigh;
NeighborKokkos *nk = (NeighborKokkos *) neighbor;
if (nk->lists_host[m]) {
inum = nk->lists_host[m]->inum;
#ifndef KOKKOS_USE_UVM
h_ilist = Kokkos::create_mirror_view(nk->lists_host[m]->d_ilist);
h_numneigh = Kokkos::create_mirror_view(nk->lists_host[m]->d_numneigh);
#else
h_ilist = nk->lists_host[m]->d_ilist;
h_numneigh = nk->lists_host[m]->d_numneigh;
#endif
Kokkos::deep_copy(h_ilist,nk->lists_host[m]->d_ilist);
Kokkos::deep_copy(h_numneigh,nk->lists_host[m]->d_numneigh);
} else if (nk->lists_device[m]) {
inum = nk->lists_device[m]->inum;
#ifndef KOKKOS_USE_UVM
h_ilist = Kokkos::create_mirror_view(nk->lists_device[m]->d_ilist);
h_numneigh = Kokkos::create_mirror_view(nk->lists_device[m]->d_numneigh);
#else
h_ilist = nk->lists_device[m]->d_ilist;
h_numneigh = nk->lists_device[m]->d_numneigh;
#endif
Kokkos::deep_copy(h_ilist,nk->lists_device[m]->d_ilist);
Kokkos::deep_copy(h_numneigh,nk->lists_device[m]->d_numneigh);
}
for (int i = 0; i < inum; i++) nneigh += h_numneigh[h_ilist[i]];
return nneigh;
}

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