Page Menu
Home
c4science
Search
Configure Global Search
Log In
Files
F81081420
pair_coul_debye_kokkos.cpp
No One
Temporary
Actions
Download File
Edit File
Delete File
View Transforms
Subscribe
Mute Notifications
Award Token
Subscribers
None
File Metadata
Details
File Info
Storage
Attached
Created
Wed, Sep 4, 03:01
Size
10 KB
Mime Type
text/x-c
Expires
Fri, Sep 6, 03:01 (2 d)
Engine
blob
Format
Raw Data
Handle
20235221
Attached To
rLAMMPS lammps
pair_coul_debye_kokkos.cpp
View Options
/* ----------------------------------------------------------------------
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.
------------------------------------------------------------------------- */
/* ----------------------------------------------------------------------
Contributing author: Ray Shan (SNL)
------------------------------------------------------------------------- */
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "pair_coul_debye_kokkos.h"
#include "kokkos.h"
#include "atom_kokkos.h"
#include "comm.h"
#include "force.h"
#include "neighbor.h"
#include "neigh_list.h"
#include "neigh_request.h"
#include "update.h"
#include "integrate.h"
#include "respa.h"
#include "math_const.h"
#include "memory.h"
#include "error.h"
#include "atom_masks.h"
using namespace LAMMPS_NS;
using namespace MathConst;
#define KOKKOS_CUDA_MAX_THREADS 256
#define KOKKOS_CUDA_MIN_BLOCKS 8
/* ---------------------------------------------------------------------- */
template<class DeviceType>
PairCoulDebyeKokkos<DeviceType>::PairCoulDebyeKokkos(LAMMPS *lmp):PairCoulDebye(lmp)
{
respa_enable = 0;
atomKK = (AtomKokkos *) atom;
execution_space = ExecutionSpaceFromDevice<DeviceType>::space;
datamask_read = X_MASK | F_MASK | TYPE_MASK | Q_MASK | ENERGY_MASK | VIRIAL_MASK;
datamask_modify = F_MASK | ENERGY_MASK | VIRIAL_MASK;
cutsq = NULL;
}
/* ---------------------------------------------------------------------- */
template<class DeviceType>
PairCoulDebyeKokkos<DeviceType>::~PairCoulDebyeKokkos()
{
if (!copymode) {
memory->destroy_kokkos(k_cutsq, cutsq);
}
}
/* ---------------------------------------------------------------------- */
template<class DeviceType>
void PairCoulDebyeKokkos<DeviceType>::cleanup_copy() {
// WHY needed: this prevents parent copy from deallocating any arrays
allocated = 0;
cutsq = NULL;
eatom = NULL;
vatom = NULL;
}
/* ---------------------------------------------------------------------- */
template<class DeviceType>
void PairCoulDebyeKokkos<DeviceType>::compute(int eflag_in, int vflag_in)
{
eflag = eflag_in;
vflag = vflag_in;
if (neighflag == FULL || neighflag == FULLCLUSTER) no_virial_fdotr_compute = 1;
if (eflag || vflag) ev_setup(eflag,vflag);
else evflag = vflag_fdotr = 0;
atomKK->sync(execution_space,datamask_read);
k_cutsq.template sync<DeviceType>();
k_cut_ljsq.template sync<DeviceType>();
k_cut_coulsq.template sync<DeviceType>();
k_params.template sync<DeviceType>();
if (eflag || vflag) atomKK->modified(execution_space,datamask_modify);
else atomKK->modified(execution_space,F_MASK);
x = atomKK->k_x.view<DeviceType>();
c_x = atomKK->k_x.view<DeviceType>();
f = atomKK->k_f.view<DeviceType>();
q = atomKK->k_q.view<DeviceType>();
type = atomKK->k_type.view<DeviceType>();
nlocal = atom->nlocal;
nall = atom->nlocal + atom->nghost;
special_lj[0] = force->special_lj[0];
special_lj[1] = force->special_lj[1];
special_lj[2] = force->special_lj[2];
special_lj[3] = force->special_lj[3];
special_coul[0] = force->special_coul[0];
special_coul[1] = force->special_coul[1];
special_coul[2] = force->special_coul[2];
special_coul[3] = force->special_coul[3];
qqrd2e = force->qqrd2e;
newton_pair = force->newton_pair;
// loop over neighbors of my atoms
copymode = 1;
EV_FLOAT ev = pair_compute<PairCoulDebyeKokkos<DeviceType>,void >
(this,(NeighListKokkos<DeviceType>*)list);
if (eflag) {
eng_vdwl += ev.evdwl;
eng_coul += ev.ecoul;
}
if (vflag_global) {
virial[0] += ev.v[0];
virial[1] += ev.v[1];
virial[2] += ev.v[2];
virial[3] += ev.v[3];
virial[4] += ev.v[4];
virial[5] += ev.v[5];
}
if (vflag_fdotr) virial_fdotr_compute();
copymode = 0;
}
/* ----------------------------------------------------------------------
compute coulomb pair force between atoms i and j
---------------------------------------------------------------------- */
template<class DeviceType>
template<bool STACKPARAMS, class Specialisation>
KOKKOS_INLINE_FUNCTION
F_FLOAT PairCoulDebyeKokkos<DeviceType>::
compute_fcoul(const F_FLOAT& rsq, const int& i, const int&j,
const int& itype, const int& jtype, const F_FLOAT& factor_coul, const F_FLOAT& qtmp) const {
const F_FLOAT r2inv = 1.0/rsq;
const F_FLOAT rinv = sqrt(r2inv);
const F_FLOAT r = 1.0/rinv;
const F_FLOAT screening = exp(-kappa*r);
F_FLOAT forcecoul;
forcecoul = qqrd2e * qtmp * q(j) * screening * (kappa + rinv) *
(STACKPARAMS?m_params[itype][jtype].scale:params(itype,jtype).scale);
return factor_coul*forcecoul*r2inv;
}
/* ----------------------------------------------------------------------
compute coulomb pair potential energy between atoms i and j
---------------------------------------------------------------------- */
template<class DeviceType>
template<bool STACKPARAMS, class Specialisation>
KOKKOS_INLINE_FUNCTION
F_FLOAT PairCoulDebyeKokkos<DeviceType>::
compute_ecoul(const F_FLOAT& rsq, const int& i, const int&j,
const int& itype, const int& jtype, const F_FLOAT& factor_coul, const F_FLOAT& qtmp) const {
const F_FLOAT r2inv = 1.0/rsq;
const F_FLOAT rinv = sqrt(r2inv);
const F_FLOAT r = 1.0/rinv;
const F_FLOAT screening = exp(-kappa*r);
return factor_coul * qqrd2e * qtmp * q(j) * rinv * screening *
(STACKPARAMS?m_params[itype][jtype].scale:params(itype,jtype).scale);
}
/* ----------------------------------------------------------------------
allocate all arrays
------------------------------------------------------------------------- */
template<class DeviceType>
void PairCoulDebyeKokkos<DeviceType>::allocate()
{
PairCoulDebye::allocate();
int n = atom->ntypes;
memory->destroy(cutsq);
memory->create_kokkos(k_cutsq,cutsq,n+1,n+1,"pair:cutsq");
d_cutsq = k_cutsq.template view<DeviceType>();
k_params = Kokkos::DualView<params_coul**,Kokkos::LayoutRight,DeviceType>("PairCoulDebye::params",n+1,n+1);
params = k_params.d_view;
}
/* ----------------------------------------------------------------------
global settings
------------------------------------------------------------------------- */
template<class DeviceType>
void PairCoulDebyeKokkos<DeviceType>::settings(int narg, char **arg)
{
if (narg > 2) error->all(FLERR,"Illegal pair_style command");
kappa = force->numeric(FLERR,arg[0]);
cut_global = force->numeric(FLERR,arg[1]);
// reset cutoffs that have been explicitly set
if (allocated) {
int i,j;
for (i = 1; i <= atom->ntypes; i++)
for (j = i+1; j <= atom->ntypes; j++)
if (setflag[i][j]) cut[i][j] = cut_global;
}
}
/* ----------------------------------------------------------------------
init specific to this pair style
------------------------------------------------------------------------- */
template<class DeviceType>
void PairCoulDebyeKokkos<DeviceType>::init_style()
{
PairCoulDebye::init_style();
// error if rRESPA with inner levels
if (update->whichflag == 1 && strstr(update->integrate_style,"respa")) {
int respa = 0;
if (((Respa *) update->integrate)->level_inner >= 0) respa = 1;
if (((Respa *) update->integrate)->level_middle >= 0) respa = 2;
if (respa)
error->all(FLERR,"Cannot use Kokkos pair style with rRESPA inner/middle");
}
// irequest = neigh request made by parent class
neighflag = lmp->kokkos->neighflag;
int irequest = neighbor->nrequest - 1;
neighbor->requests[irequest]->
kokkos_host = Kokkos::Impl::is_same<DeviceType,LMPHostType>::value &&
!Kokkos::Impl::is_same<DeviceType,LMPDeviceType>::value;
neighbor->requests[irequest]->
kokkos_device = Kokkos::Impl::is_same<DeviceType,LMPDeviceType>::value;
if (neighflag == FULL) {
neighbor->requests[irequest]->full = 1;
neighbor->requests[irequest]->half = 0;
neighbor->requests[irequest]->full_cluster = 0;
} else if (neighflag == HALF || neighflag == HALFTHREAD) {
neighbor->requests[irequest]->full = 0;
neighbor->requests[irequest]->half = 1;
neighbor->requests[irequest]->full_cluster = 0;
} else if (neighflag == N2) {
neighbor->requests[irequest]->full = 0;
neighbor->requests[irequest]->half = 0;
neighbor->requests[irequest]->full_cluster = 0;
} else if (neighflag == FULLCLUSTER) {
neighbor->requests[irequest]->full_cluster = 1;
neighbor->requests[irequest]->full = 1;
neighbor->requests[irequest]->half = 0;
} else {
error->all(FLERR,"Cannot use chosen neighbor list style with coul/debye/kk");
}
}
/* ----------------------------------------------------------------------
init for one type pair i,j and corresponding j,i
------------------------------------------------------------------------- */
template<class DeviceType>
double PairCoulDebyeKokkos<DeviceType>::init_one(int i, int j)
{
double cutone = PairCoulDebye::init_one(i,j);
k_params.h_view(i,j).scale = scale[i][j];
k_params.h_view(i,j).cutsq = cutone*cutone;
k_params.h_view(j,i) = k_params.h_view(i,j);
if(i<MAX_TYPES_STACKPARAMS+1 && j<MAX_TYPES_STACKPARAMS+1) {
m_params[i][j] = m_params[j][i] = k_params.h_view(i,j);
m_cutsq[j][i] = m_cutsq[i][j] = cutone*cutone;
m_cut_ljsq[j][i] = m_cut_ljsq[i][j] = cutone*cutone;
m_cut_coulsq[j][i] = m_cut_coulsq[i][j] = cutone*cutone;
}
k_cutsq.h_view(i,j) = cutone*cutone;
k_cutsq.template modify<LMPHostType>();
//k_cut_ljsq.h_view(i,j) = cutone*cutone;
k_cut_ljsq.template modify<LMPHostType>();
//k_cut_coulsq.h_view(i,j) = cutone*cutone;
k_cut_coulsq.template modify<LMPHostType>();
k_params.template modify<LMPHostType>();
return cutone;
}
namespace LAMMPS_NS {
template class PairCoulDebyeKokkos<LMPDeviceType>;
#ifdef KOKKOS_HAVE_CUDA
template class PairCoulDebyeKokkos<LMPHostType>;
#endif
}
Event Timeline
Log In to Comment