Page Menu
Home
c4science
Search
Configure Global Search
Log In
Files
F81203455
pair_buck_coul_cut_intel.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, 17:56
Size
18 KB
Mime Type
text/x-c++
Expires
Fri, Sep 6, 17:56 (2 d)
Engine
blob
Format
Raw Data
Handle
20289398
Attached To
rLAMMPS lammps
pair_buck_coul_cut_intel.cpp
View Options
/* -*- 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 "stdio.h"
#include "stdlib.h"
#include "string.h"
#include "pair_buck_coul_cut_intel.h"
#include "atom.h"
#include "comm.h"
#include "force.h"
#include "group.h"
#include "kspace.h"
#include "neighbor.h"
#include "neigh_list.h"
#include "neigh_request.h"
#include "math_const.h"
#include "memory.h"
#include "error.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
#define C_CUT_T typename ForceConst<flt_t>::c_cut_t
PairBuckCoulCutIntel::PairBuckCoulCutIntel(LAMMPS *lmp) :
PairBuckCoulCut(lmp)
{
suffix_flag |= Suffix::INTEL;
}
PairBuckCoulCutIntel::~PairBuckCoulCutIntel()
{
}
void PairBuckCoulCutIntel::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 PairBuckCoulCutIntel::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 PairBuckCoulCutIntel::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);
flt_t * _noalias const q = buffers->get_q(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_coul = fc.special_coul;
const flt_t * _noalias const special_lj = fc.special_lj;
const flt_t qqrd2e = force->qqrd2e;
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 C_CUT_T * _noalias const c_cut = fc.c_cut[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
const int ncoulmask = this->ncoulmask;
const int ncoulshiftbits = this->ncoulshiftbits;
if (offload) fix->start_watch(TIME_OFFLOAD_LATENCY);
#pragma offload target(mic:_cop) if(offload) \
in(special_lj,special_coul:length(0) alloc_if(0) free_if(0)) \
in(c_force, c_energy, c_cut: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(q:length(q_size) alloc_if(0) free_if(0)) \
in(overflow:length(0) alloc_if(0) free_if(0)) \
in(astart,nthreads,qqrd2e,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, q);
acc_t oevdwl, oecoul, ov0, ov1, ov2, ov3, ov4, ov5;
if (EVFLAG) {
oevdwl = oecoul = (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,oecoul,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 C_CUT_T * _noalias const c_cuti = c_cut + ptr_off;
const int * _noalias const jlist = firstneigh + cnumneigh[i];
const int jnum = numneigh[i];
acc_t fxtmp,fytmp,fztmp,fwtmp;
acc_t sevdwl, secoul, 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;
const flt_t qtmp = q[i];
fxtmp = fytmp = fztmp = (acc_t)0;
if (EVFLAG) {
if (EFLAG) fwtmp = sevdwl = secoul = (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 forcecoul, forcebuck, evdwl, ecoul;
forcecoul = forcebuck = evdwl = ecoul = (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_cuti[jtype].cut_coulsq) {
#endif
forcecoul = qqrd2e * qtmp*q[j]/r;
if (EFLAG)
ecoul = forcecoul;
if (sbindex){
const flt_t factor_coul = special_coul[sbindex];
forcecoul *= factor_coul;
if(EFLAG)
ecoul *= factor_coul;
}
#ifdef INTEL_VMASK
}
#else
if (rsq >= c_cuti[jtype].cut_coulsq)
{ forcecoul = (flt_t)0.0; ecoul = (flt_t)0.0; }
#endif
#ifdef INTEL_VMASK
if (rsq < c_cuti[jtype].cut_ljsq) {
#endif
flt_t r6inv = r2inv * r2inv * r2inv;
flt_t rexp = exp(-r * c_forcei[jtype].rhoinv);
forcebuck = r * rexp * c_forcei[jtype].buck1 -
r6inv * c_forcei[jtype].buck2;
if (EFLAG)
evdwl = rexp * c_energyi[jtype].a -
r6inv * c_energyi[jtype].c -
c_energyi[jtype].offset;
if (sbindex) {
const flt_t factor_lj = special_lj[sbindex];
forcebuck *= factor_lj;
if (EFLAG)
evdwl *= factor_lj;
}
#ifdef INTEL_VMASK
}
#else
if (rsq >= c_cuti[jtype].cut_ljsq)
{ forcebuck = (flt_t)0.0; evdwl = (flt_t)0.0; }
#endif
#ifdef INTEL_VMASK
if (rsq < c_cuti[jtype].cutsq) {
#endif
const flt_t fpair = (forcecoul + 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;
secoul += ev_pre * ecoul;
if (eatom) {
if (NEWTON_PAIR || i < nlocal)
fwtmp += (flt_t)0.5 * evdwl + (flt_t)0.5 * ecoul;
if (NEWTON_PAIR || j < nlocal)
f[j].w += (flt_t)0.5 * evdwl + (flt_t)0.5 * ecoul;
}
}
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_atomq(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] = oecoul;
}
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 PairBuckCoulCutIntel::init_style()
{
PairBuckCoulCut::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 PairBuckCoulCutIntel::pack_force_const(ForceConst<flt_t> &fc,
IntelBuffers<flt_t,acc_t> *buffers)
{
int tp1 = atom->ntypes + 1;
int ntable = 1;
if (ncoultablebits)
for (int i = 0; i < ncoultablebits; i++) ntable *= 2;
fc.set_ntypes(tp1, ntable, 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_coul[i] = force->special_coul[i];
fc.special_coul[0] = 1.0;
fc.special_lj[0] = 1.0;
}
for (int i = 0; i < tp1; i++) {
for (int j = 0; j < tp1; j++) {
fc.c_cut[i][j].cutsq = cutsq[i][j];
fc.c_cut[i][j].cut_ljsq = cut_ljsq[i][j];
fc.c_cut[i][j].cut_coulsq = cut_coulsq[i][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_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;
flt_t * special_coul = fc.special_coul;
C_FORCE_T * c_force = fc.c_force[0];
C_ENERGY_T * c_energy = fc.c_energy[0];
C_CUT_T * c_cut = fc.c_cut[0];
flt_t * ocutneighsq = cutneighsq[0];
int tp1sq = tp1 * tp1;
#pragma offload_transfer target(mic:_cop) \
in(special_lj, special_coul: length(4) alloc_if(0) free_if(0)) \
in(c_force, c_energy, c_cut: length(tp1sq) alloc_if(0) free_if(0)) \
in(ocutneighsq: length(tp1sq) alloc_if(0) free_if(0))
#endif
}
/* ---------------------------------------------------------------------- */
template <class flt_t>
void PairBuckCoulCutIntel::ForceConst<flt_t>::set_ntypes(const int ntypes,
const int ntable,
Memory *memory,
const int cop) {
if ( (ntypes != _ntypes || ntable != _ntable) ) {
if (_ntypes > 0) {
#ifdef _LMP_INTEL_OFFLOAD
flt_t * ospecial_lj = special_lj;
flt_t * ospecial_coul = special_coul;
c_force_t * oc_force = c_force[0];
c_energy_t * oc_energy = c_energy[0];
c_cut_t * oc_cut = c_cut[0];
if (ospecial_lj != NULL && oc_force != NULL && oc_cut != NULL &&
oc_energy != NULL && ospecial_coul != NULL &&
_cop >= 0) {
#pragma offload_transfer target(mic:cop) \
nocopy(ospecial_lj, ospecial_coul: alloc_if(0) free_if(1)) \
nocopy(oc_force, oc_energy: alloc_if(0) free_if(1)) \
nocopy(oc_cut: alloc_if(0) free_if(1))
}
#endif
_memory->destroy(c_force);
_memory->destroy(c_energy);
_memory->destroy(c_cut);
}
if (ntypes > 0) {
_cop = cop;
memory->create(c_force,ntypes,ntypes,"fc.c_force");
memory->create(c_energy,ntypes,ntypes,"fc.c_energy");
memory->create(c_cut,ntypes,ntypes,"fc.c_cut");
#ifdef _LMP_INTEL_OFFLOAD
flt_t * ospecial_lj = special_lj;
flt_t * ospecial_coul = special_coul;
c_force_t * oc_force = c_force[0];
c_energy_t * oc_energy = c_energy[0];
c_cut_t * oc_cut = c_cut[0];
int tp1sq = ntypes*ntypes;
if (ospecial_lj != NULL && oc_force != NULL && oc_cut != NULL &&
oc_energy != NULL && ospecial_coul != NULL &&
cop >= 0) {
#pragma offload_transfer target(mic:cop) \
nocopy(ospecial_lj: length(4) alloc_if(1) free_if(0)) \
nocopy(ospecial_coul: 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)) \
nocopy(oc_cut: length(tp1sq) alloc_if(1) free_if(0))
}
#endif
}
}
_ntypes=ntypes;
_ntable=ntable;
_memory=memory;
}
Event Timeline
Log In to Comment