165 lines
4.4 KiB
C++
165 lines
4.4 KiB
C++
/* ----------------------------------------------------------------------
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LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
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https://www.lammps.org/, Sandia National Laboratories
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The LAMMPS Developers, developers@lammps.org
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This software is distributed under 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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/* ----------------------------------------------------------------------
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Contributing author: Axel Kohlmeyer (Temple U)
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------------------------------------------------------------------------- */
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#include "pair_morse2_omp.h"
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#include "atom.h"
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#include "comm.h"
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#include "force.h"
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#include "neigh_list.h"
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#include "suffix.h"
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#include <cmath>
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#include "omp_compat.h"
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using namespace LAMMPS_NS;
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/* ---------------------------------------------------------------------- */
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PairMorse2OMP::PairMorse2OMP(LAMMPS *lmp) : PairMorse2(lmp), ThrOMP(lmp, THR_PAIR)
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{
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suffix_flag |= Suffix::OMP;
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respa_enable = 0;
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}
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/* ---------------------------------------------------------------------- */
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void PairMorse2OMP::compute(int eflag, int vflag)
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{
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ev_init(eflag, vflag);
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const int nall = atom->nlocal + atom->nghost;
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const int nthreads = comm->nthreads;
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const int inum = list->inum;
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#if defined(_OPENMP)
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#pragma omp parallel LMP_DEFAULT_NONE LMP_SHARED(eflag, vflag)
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#endif
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{
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int ifrom, ito, tid;
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loop_setup_thr(ifrom, ito, tid, inum, nthreads);
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ThrData *thr = fix->get_thr(tid);
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thr->timer(Timer::START);
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ev_setup_thr(eflag, vflag, nall, eatom, vatom, nullptr, thr);
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if (evflag) {
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if (eflag) {
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if (force->newton_pair)
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eval<1, 1, 1>(ifrom, ito, thr);
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else
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eval<1, 1, 0>(ifrom, ito, thr);
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} else {
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if (force->newton_pair)
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eval<1, 0, 1>(ifrom, ito, thr);
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else
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eval<1, 0, 0>(ifrom, ito, thr);
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}
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} else {
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if (force->newton_pair)
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eval<0, 0, 1>(ifrom, ito, thr);
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else
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eval<0, 0, 0>(ifrom, ito, thr);
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}
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thr->timer(Timer::PAIR);
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reduce_thr(this, eflag, vflag, thr);
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} // end of omp parallel region
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}
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template <int EVFLAG, int EFLAG, int NEWTON_PAIR>
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void PairMorse2OMP::eval(int iifrom, int iito, ThrData *const thr)
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{
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int i, j, ii, jj, jnum, itype, jtype;
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double xtmp, ytmp, ztmp, delx, dely, delz, evdwl, fpair;
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double rsq, r, dr, dexp, factor_lj;
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int *ilist, *jlist, *numneigh, **firstneigh;
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evdwl = 0.0;
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const dbl3_t *_noalias const x = (dbl3_t *) atom->x[0];
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dbl3_t *_noalias const f = (dbl3_t *) thr->get_f()[0];
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const int *_noalias const type = atom->type;
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const int nlocal = atom->nlocal;
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const double *_noalias const special_lj = force->special_lj;
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double fxtmp, fytmp, fztmp;
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ilist = list->ilist;
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numneigh = list->numneigh;
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firstneigh = list->firstneigh;
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// loop over neighbors of my atoms
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for (ii = iifrom; ii < iito; ++ii) {
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i = ilist[ii];
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xtmp = x[i].x;
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ytmp = x[i].y;
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ztmp = x[i].z;
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itype = type[i];
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jlist = firstneigh[i];
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jnum = numneigh[i];
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fxtmp = fytmp = fztmp = 0.0;
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for (jj = 0; jj < jnum; jj++) {
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j = jlist[jj];
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factor_lj = special_lj[sbmask(j)];
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j &= NEIGHMASK;
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delx = xtmp - x[j].x;
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dely = ytmp - x[j].y;
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delz = ztmp - x[j].z;
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rsq = delx * delx + dely * dely + delz * delz;
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jtype = type[j];
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if (rsq < cutsq[itype][jtype]) {
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r = sqrt(rsq);
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dr = r - r0[itype][jtype];
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dexp = exp(-alpha[itype][jtype] * dr);
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fpair = factor_lj * morse1[itype][jtype] * (dexp * dexp - dexp) / r;
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fxtmp += delx * fpair;
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fytmp += dely * fpair;
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fztmp += delz * fpair;
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if (NEWTON_PAIR || j < nlocal) {
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f[j].x -= delx * fpair;
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f[j].y -= dely * fpair;
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f[j].z -= delz * fpair;
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}
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if (EFLAG) {
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evdwl = d0[itype][jtype] * (dexp * dexp - 2.0 * dexp) - offset[itype][jtype];
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evdwl *= factor_lj;
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}
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if (EVFLAG)
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ev_tally_thr(this, i, j, nlocal, NEWTON_PAIR, evdwl, 0.0, fpair, delx, dely, delz, thr);
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}
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}
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f[i].x += fxtmp;
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f[i].y += fytmp;
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f[i].z += fztmp;
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}
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}
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/* ---------------------------------------------------------------------- */
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double PairMorse2OMP::memory_usage()
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{
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double bytes = memory_usage_thr();
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bytes += PairMorse2::memory_usage();
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return bytes;
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}
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