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pair_buck_intel.cpp
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pair_buck_intel.cpp
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/* -*- c++ -*- ----------------------------------------------------------
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: Rodrigo Canales (RWTH Aachen University)
------------------------------------------------------------------------- */
#include "math.h"
#include "pair_buck_intel.h"
#include "atom.h"
#include "comm.h"
#include "force.h"
#include "group.h"
#include "neighbor.h"
#include "neigh_list.h"
#include "neigh_request.h"
#include "math_const.h"
#include "memory.h"
#include "suffix.h"
#include "force.h"
#include "modify.h"
using namespace LAMMPS_NS;
using namespace MathConst;
#define C_FORCE_T typename ForceConst<flt_t>::c_force_t
#define C_ENERGY_T typename ForceConst<flt_t>::c_energy_t
PairBuckIntel::PairBuckIntel(LAMMPS *lmp) : PairBuck(lmp)
{
suffix_flag |= Suffix::INTEL;
}
PairBuckIntel::~PairBuckIntel()
{
}
void PairBuckIntel::compute(int eflag, int vflag)
{
if (fix->precision()==FixIntel::PREC_MODE_MIXED)
compute<float,double>(eflag, vflag, fix->get_mixed_buffers(),
force_const_single);
else if (fix->precision()==FixIntel::PREC_MODE_DOUBLE)
compute<double,double>(eflag, vflag, fix->get_double_buffers(),
force_const_double);
else
compute<float,float>(eflag, vflag, fix->get_single_buffers(),
force_const_single);
fix->balance_stamp();
vflag_fdotr = 0;
}
template <class flt_t, class acc_t>
void PairBuckIntel::compute(int eflag, int vflag,
IntelBuffers<flt_t,acc_t> *buffers,
const ForceConst<flt_t> &fc)
{
if (eflag || vflag) {
ev_setup(eflag,vflag);
} else evflag = vflag_fdotr = 0;
const int inum = list->inum;
const int nthreads = comm->nthreads;
const int host_start = fix->host_start_pair();
const int offload_end = fix->offload_end_pair();
const int ago = neighbor->ago;
if (ago != 0 && fix->separate_buffers() == 0) {
fix->start_watch(TIME_PACK);
#if defined(_OPENMP)
#pragma omp parallel default(none) shared(eflag,vflag,buffers,fc)
#endif
{
int ifrom, ito, tid;
IP_PRE_omp_range_id_align(ifrom, ito, tid, atom->nlocal + atom->nghost,
nthreads, sizeof(ATOM_T));
buffers->thr_pack(ifrom,ito,ago);
}
fix->stop_watch(TIME_PACK);
}
if (evflag || vflag_fdotr) {
int ovflag = 0;
if (vflag_fdotr) ovflag = 2;
else if (vflag) ovflag = 1;
if (eflag) {
if (force->newton_pair) {
eval<1,1,1>(1, ovflag, buffers, fc, 0, offload_end);
eval<1,1,1>(0, ovflag, buffers, fc, host_start, inum);
} else {
eval<1,1,0>(1, ovflag, buffers, fc, 0, offload_end);
eval<1,1,0>(0, ovflag, buffers, fc, host_start, inum);
}
} else {
if (force->newton_pair) {
eval<1,0,1>(1, ovflag, buffers, fc, 0, offload_end);
eval<1,0,1>(0, ovflag, buffers, fc, host_start, inum);
} else {
eval<1,0,0>(1, ovflag, buffers, fc, 0, offload_end);
eval<1,0,0>(0, ovflag, buffers, fc, host_start, inum);
}
}
} else {
if (force->newton_pair) {
eval<0,0,1>(1, 0, buffers, fc, 0, offload_end);
eval<0,0,1>(0, 0, buffers, fc, host_start, inum);
} else {
eval<0,0,0>(1, 0, buffers, fc, 0, offload_end);
eval<0,0,0>(0, 0, buffers, fc, host_start, inum);
}
}
}
/* ---------------------------------------------------------------------- */
template <int EVFLAG, int EFLAG, int NEWTON_PAIR, class flt_t, class acc_t>
void PairBuckIntel::eval(const int offload, const int vflag,
IntelBuffers<flt_t,acc_t> *buffers,
const ForceConst<flt_t> &fc,
const int astart, const int aend)
{
const int inum = aend - astart;
if (inum == 0) return;
int nlocal, nall, minlocal;
fix->get_buffern(offload, nlocal, nall, minlocal);
const int ago = neighbor->ago;
IP_PRE_pack_separate_buffers(fix, buffers, ago, offload, nlocal, nall);
ATOM_T * _noalias const x = buffers->get_x(offload);
const int * _noalias const numneigh = list->numneigh;
const int * _noalias const cnumneigh = buffers->cnumneigh(list);
const int * _noalias const firstneigh = buffers->firstneigh(list);
const flt_t * _noalias const special_lj = fc.special_lj;
const C_FORCE_T * _noalias const c_force = fc.c_force[0];
const C_ENERGY_T * _noalias const c_energy = fc.c_energy[0];
const int ntypes = atom->ntypes + 1;
const int eatom = this->eflag_atom;
// Determine how much data to transfer
int x_size, q_size, f_stride, ev_size, separate_flag;
IP_PRE_get_transfern(ago, NEWTON_PAIR, EVFLAG, EFLAG, vflag,
buffers, offload, fix, separate_flag,
x_size, q_size, ev_size, f_stride);
int tc;
FORCE_T * _noalias f_start;
acc_t * _noalias ev_global;
IP_PRE_get_buffers(offload, buffers, fix, tc, f_start, ev_global);
const int nthreads = tc;
#ifdef _LMP_INTEL_OFFLOAD
int *overflow = fix->get_off_overflow_flag();
double *timer_compute = fix->off_watch_pair();
// Redeclare as local variables for offload
if (offload) fix->start_watch(TIME_OFFLOAD_LATENCY);
#pragma offload target(mic:_cop) if(offload) \
in(special_lj:length(0) alloc_if(0) free_if(0)) \
in(c_force, c_energy:length(0) alloc_if(0) free_if(0)) \
in(firstneigh:length(0) alloc_if(0) free_if(0)) \
in(cnumneigh:length(0) alloc_if(0) free_if(0)) \
in(numneigh:length(0) alloc_if(0) free_if(0)) \
in(x:length(x_size) alloc_if(0) free_if(0)) \
in(overflow:length(0) alloc_if(0) free_if(0)) \
in(astart,nthreads,inum,nall,ntypes,vflag,eatom) \
in(f_stride,nlocal,minlocal,separate_flag,offload) \
out(f_start:length(f_stride) alloc_if(0) free_if(0)) \
out(ev_global:length(ev_size) alloc_if(0) free_if(0)) \
out(timer_compute:length(1) alloc_if(0) free_if(0)) \
signal(f_start)
#endif
{
#if defined(__MIC__) && defined(_LMP_INTEL_OFFLOAD)
*timer_compute = MIC_Wtime();
#endif
IP_PRE_repack_for_offload(NEWTON_PAIR, separate_flag, nlocal, nall,
f_stride, x, 0);
acc_t oevdwl, ov0, ov1, ov2, ov3, ov4, ov5;
if (EVFLAG) {
oevdwl = (acc_t)0;
if (vflag) ov0 = ov1 = ov2 = ov3 = ov4 = ov5 = (acc_t)0;
}
// loop over neighbors of my atoms
#if defined(_OPENMP)
#pragma omp parallel default(none) \
shared(f_start,f_stride,nlocal,nall,minlocal) \
reduction(+:oevdwl,ov0,ov1,ov2,ov3,ov4,ov5)
#endif
{
int iifrom, iito, tid;
IP_PRE_omp_range_id(iifrom, iito, tid, inum, nthreads);
iifrom += astart;
iito += astart;
FORCE_T * _noalias const f = f_start - minlocal + (tid * f_stride);
memset(f + minlocal, 0, f_stride * sizeof(FORCE_T));
for (int i = iifrom; i < iito; ++i) {
const int itype = x[i].w;
const int ptr_off = itype * ntypes;
const C_FORCE_T * _noalias const c_forcei = c_force + ptr_off;
const C_ENERGY_T * _noalias const c_energyi = c_energy + ptr_off;
const int * _noalias const jlist = firstneigh + cnumneigh[i];
const int jnum = numneigh[i];
acc_t fxtmp,fytmp,fztmp,fwtmp;
acc_t sevdwl, sv0, sv1, sv2, sv3, sv4, sv5;
const flt_t xtmp = x[i].x;
const flt_t ytmp = x[i].y;
const flt_t ztmp = x[i].z;
fxtmp = fytmp = fztmp = (acc_t)0;
if (EVFLAG) {
if (EFLAG) fwtmp = sevdwl = (acc_t)0;
if (vflag==1) sv0 = sv1 = sv2 = sv3 = sv4 = sv5 = (acc_t)0;
}
#if defined(LMP_SIMD_COMPILER)
#pragma vector aligned
#pragma simd reduction(+:fxtmp, fytmp, fztmp, fwtmp, sevdwl, \
sv0, sv1, sv2, sv3, sv4, sv5)
#endif
for (int jj = 0; jj < jnum; jj++) {
flt_t forcebuck, evdwl;
forcebuck = evdwl = (flt_t)0.0;
const int sbindex = jlist[jj] >> SBBITS & 3;
const int j = jlist[jj] & NEIGHMASK;
const flt_t delx = xtmp - x[j].x;
const flt_t dely = ytmp - x[j].y;
const flt_t delz = ztmp - x[j].z;
const int jtype = x[j].w;
const flt_t rsq = delx * delx + dely * dely + delz * delz;
const flt_t r = sqrt(rsq);
const flt_t r2inv = (flt_t)1.0 / rsq;
#ifdef INTEL_VMASK
if (rsq < c_forcei[jtype].cutsq) {
#endif
const flt_t r6inv = r2inv * r2inv * r2inv;
const flt_t rexp = exp(-r * c_forcei[jtype].rhoinv);
forcebuck = r * rexp * c_forcei[jtype].buck1 -
r6inv * c_forcei[jtype].buck2;
#ifndef INTEL_VMASK
if (rsq > c_forcei[jtype].cutsq)
forcebuck =(flt_t)0.0;
#endif
if (EFLAG) {
evdwl = rexp * c_energyi[jtype].a -
r6inv * c_energyi[jtype].c -
c_energyi[jtype].offset;
#ifndef INTEL_VMASK
if (rsq > c_forcei[jtype].cutsq)
evdwl =(flt_t)0.0;
#endif
}
if (sbindex) {
const flt_t factor_lj = special_lj[sbindex];
forcebuck *= factor_lj;
if (EFLAG)
evdwl *= factor_lj;
}
const flt_t fpair = forcebuck * r2inv;
fxtmp += delx * fpair;
fytmp += dely * fpair;
fztmp += delz * fpair;
if (NEWTON_PAIR || j < nlocal) {
f[j].x -= delx * fpair;
f[j].y -= dely * fpair;
f[j].z -= delz * fpair;
}
if (EVFLAG) {
flt_t ev_pre = (flt_t)0;
if (NEWTON_PAIR || i < nlocal)
ev_pre += (flt_t)0.5;
if (NEWTON_PAIR || j < nlocal)
ev_pre += (flt_t)0.5;
if (EFLAG) {
sevdwl += ev_pre * evdwl;
if (eatom) {
if (NEWTON_PAIR || i < nlocal)
fwtmp += (flt_t)0.5 * evdwl;
if (NEWTON_PAIR || j < nlocal)
f[j].w += (flt_t)0.5 * evdwl;
}
}
IP_PRE_ev_tally_nbor(vflag, ev_pre, fpair, delx, dely, delz);
}
#ifdef INTEL_VMASK
}
#endif
} // for jj
f[i].x += fxtmp;
f[i].y += fytmp;
f[i].z += fztmp;
IP_PRE_ev_tally_atom(EVFLAG, EFLAG, vflag, f, fwtmp);
} // for ii
#ifndef _LMP_INTEL_OFFLOAD
if (vflag == 2)
#endif
{
#if defined(_OPENMP)
#pragma omp barrier
#endif
IP_PRE_fdotr_acc_force(NEWTON_PAIR, EVFLAG, EFLAG, vflag, eatom, nall,
nlocal, minlocal, nthreads, f_start, f_stride,
x, offload);
}
} // end of omp parallel region
if (EVFLAG) {
if (EFLAG) {
ev_global[0] = oevdwl;
ev_global[1] = (acc_t)0;
}
if (vflag) {
ev_global[2] = ov0;
ev_global[3] = ov1;
ev_global[4] = ov2;
ev_global[5] = ov3;
ev_global[6] = ov4;
ev_global[7] = ov5;
}
}
#if defined(__MIC__) && defined(_LMP_INTEL_OFFLOAD)
*timer_compute = MIC_Wtime() - *timer_compute;
#endif
} // end of offload region
if (offload)
fix->stop_watch(TIME_OFFLOAD_LATENCY);
else
fix->stop_watch(TIME_HOST_PAIR);
if (EVFLAG)
fix->add_result_array(f_start, ev_global, offload, eatom, 0, vflag);
else
fix->add_result_array(f_start, 0, offload);
}
void PairBuckIntel::init_style()
{
PairBuck::init_style();
neighbor->requests[neighbor->nrequest-1]->intel = 1;
int ifix = modify->find_fix("package_intel");
if (ifix < 0)
error->all(FLERR,
"The 'package intel' command is required for /intel styles");
fix = static_cast<FixIntel *>(modify->fix[ifix]);
fix->pair_init_check();
#ifdef _LMP_INTEL_OFFLOAD
_cop = fix->coprocessor_number();
#endif
if (fix->precision() == FixIntel::PREC_MODE_MIXED)
pack_force_const(force_const_single, fix->get_mixed_buffers());
else if (fix->precision() == FixIntel::PREC_MODE_DOUBLE)
pack_force_const(force_const_double, fix->get_double_buffers());
else
pack_force_const(force_const_single, fix->get_single_buffers());
}
template <class flt_t, class acc_t>
void PairBuckIntel::pack_force_const(ForceConst<flt_t> &fc,
IntelBuffers<flt_t,acc_t> *buffers)
{
int tp1 = atom->ntypes + 1;
fc.set_ntypes(tp1, memory, _cop);
buffers->set_ntypes(tp1);
flt_t **cutneighsq = buffers->get_cutneighsq();
// Repeat cutsq calculation because done after call to init_style
double cut, cutneigh;
for (int i = 1; i <= atom->ntypes; i++) {
for (int j = i; j <= atom->ntypes; j++) {
if (setflag[i][j] != 0 || (setflag[i][i] != 0 && setflag[j][j] != 0)) {
cut = init_one(i, j);
cutneigh = cut + neighbor->skin;
cutsq[i][j] = cutsq[j][i] = cut*cut;
cutneighsq[i][j] = cutneighsq[j][i] = cutneigh * cutneigh;
}
}
}
for (int i = 0; i < 4; i++) {
fc.special_lj[i] = force->special_lj[i];
fc.special_lj[0] = 1.0;
}
for (int i = 0; i < tp1; i++) {
for (int j = 0; j < tp1; j++) {
fc.c_force[i][j].buck1 = buck1[i][j];
fc.c_force[i][j].buck2 = buck2[i][j];
fc.c_force[i][j].rhoinv = rhoinv[i][j];
fc.c_force[i][j].cutsq = cutsq[i][j];
fc.c_energy[i][j].a = a[i][j];
fc.c_energy[i][j].c = c[i][j];
fc.c_energy[i][j].offset = offset[i][j];
}
}
#ifdef _LMP_INTEL_OFFLOAD
if (_cop < 0) return;
flt_t * special_lj = fc.special_lj;
C_FORCE_T * c_force = fc.c_force[0];
C_ENERGY_T * c_energy = fc.c_energy[0];
flt_t * ocutneighsq = cutneighsq[0];
int tp1sq = tp1 * tp1;
#pragma offload_transfer target(mic:_cop) \
in(special_lj: length(4) alloc_if(0) free_if(0)) \
in(c_force, c_energy: length(tp1sq) alloc_if(0) free_if(0)) \
in(ocutneighsq: length(tp1sq) alloc_if(0) free_if(0))
#endif
}
/* ---------------------------------------------------------------------- */
template <class flt_t>
void PairBuckIntel::ForceConst<flt_t>::set_ntypes(const int ntypes,
Memory *memory,
const int cop) {
if ( (ntypes != _ntypes ) ) {
if (_ntypes > 0) {
#ifdef _LMP_INTEL_OFFLOAD
flt_t * ospecial_lj = special_lj;
c_force_t * oc_force = c_force[0];
c_energy_t * oc_energy = c_energy[0];
if (ospecial_lj != NULL && oc_force != NULL &&
oc_energy != NULL &&
_cop >= 0) {
#pragma offload_transfer target(mic:cop) \
nocopy(ospecial_lj: alloc_if(0) free_if(1)) \
nocopy(oc_force, oc_energy: alloc_if(0) free_if(1))
}
#endif
_memory->destroy(c_force);
_memory->destroy(c_energy);
}
if (ntypes > 0) {
_cop = cop;
memory->create(c_force,ntypes,ntypes,"fc.c_force");
memory->create(c_energy,ntypes,ntypes,"fc.c_energy");
#ifdef _LMP_INTEL_OFFLOAD
flt_t * ospecial_lj = special_lj;
c_force_t * oc_force = c_force[0];
c_energy_t * oc_energy = c_energy[0];
int tp1sq = ntypes*ntypes;
if (ospecial_lj != NULL && oc_force != NULL &&
oc_energy != NULL &&
cop >= 0) {
#pragma offload_transfer target(mic:cop) \
nocopy(ospecial_lj: length(4) alloc_if(1) free_if(0)) \
nocopy(oc_force: length(tp1sq) alloc_if(1) free_if(0)) \
nocopy(oc_energy: length(tp1sq) alloc_if(1) free_if(0))
}
#endif
}
}
_ntypes=ntypes;
_memory=memory;
}

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