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lammps/src/USER-OMP/pair_comb_omp.cpp
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pair_comb_omp.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
This software is distributed under the GNU General Public License.
See the README file in the top-level LAMMPS directory.
------------------------------------------------------------------------- */
/* ----------------------------------------------------------------------
Contributing author: Axel Kohlmeyer (Temple U)
------------------------------------------------------------------------- */
#include <math.h>
#include "pair_comb_omp.h"
#include "atom.h"
#include "comm.h"
#include "group.h"
#include "force.h"
#include "memory.h"
#include "my_page.h"
#include "neighbor.h"
#include "neigh_list.h"
#include "suffix.h"
using namespace LAMMPS_NS;
#define MAXNEIGH 24
/* ---------------------------------------------------------------------- */
PairCombOMP::PairCombOMP(LAMMPS *lmp) :
PairComb(lmp), ThrOMP(lmp, THR_PAIR)
{
suffix_flag |= Suffix::OMP;
respa_enable = 0;
}
/* ---------------------------------------------------------------------- */
void PairCombOMP::compute(int eflag, int vflag)
{
if (eflag || vflag) {
ev_setup(eflag,vflag);
} else evflag = vflag_fdotr = vflag_atom = 0;
const int nall = atom->nlocal + atom->nghost;
const int nthreads = comm->nthreads;
const int inum = list->inum;
// Build short range neighbor list
Short_neigh_thr();
#if defined(_OPENMP)
#pragma omp parallel default(none) shared(eflag,vflag)
#endif
{
int ifrom, ito, tid;
loop_setup_thr(ifrom, ito, tid, inum, nthreads);
ThrData *thr = fix->get_thr(tid);
thr->timer(Timer::START);
ev_setup_thr(eflag, vflag, nall, eatom, vatom, thr);
if (evflag) {
if (eflag) {
if (vflag_atom) eval<1,1,1>(ifrom, ito, thr);
else eval<1,1,0>(ifrom, ito, thr);
} else {
if (vflag_atom) eval<1,0,1>(ifrom, ito, thr);
else eval<1,0,0>(ifrom, ito, thr);
}
} else eval<0,0,0>(ifrom, ito, thr);
thr->timer(Timer::PAIR);
reduce_thr(this, eflag, vflag, thr);
} // end of omp parallel region
}
template <int EVFLAG, int EFLAG, int VFLAG_ATOM>
void PairCombOMP::eval(int iifrom, int iito, ThrData * const thr)
{
int i,j,k,ii,jj,kk,jnum,iparam_i;
tagint itag,jtag;
int itype,jtype,ktype,iparam_ij,iparam_ijk;
double xtmp,ytmp,ztmp,delx,dely,delz,evdwl,ecoul,fpair;
double rsq,rsq1,rsq2;
double delr1[3],delr2[3],fi[3],fj[3],fk[3];
double zeta_ij,prefactor;
int *ilist,*jlist,*numneigh,**firstneigh;
int mr1,mr2,mr3;
int rsc,inty;
double elp_ij,filp[3],fjlp[3],fklp[3];
double iq,jq;
double yaself;
double potal,fac11,fac11e;
double vionij,fvionij,sr1,sr2,sr3,Eov,Fov;
int sht_jnum, *sht_jlist, nj;
evdwl = ecoul = 0.0;
const double * const * const x = atom->x;
double * const * const f = thr->get_f();
const double * const q = atom->q;
const tagint * const tag = atom->tag;
const int * const type = atom->type;
const int nlocal = atom->nlocal;
ilist = list->ilist;
numneigh = list->numneigh;
firstneigh = list->firstneigh;
yaself = vionij = fvionij = Eov = Fov = 0.0;
double fxtmp,fytmp,fztmp;
double fjxtmp,fjytmp,fjztmp;
// self energy correction term: potal
potal_calc(potal,fac11,fac11e);
// loop over full neighbor list of my atoms
for (ii = iifrom; ii < iito; ++ii) {
i = ilist[ii];
itag = tag[i];
itype = map[type[i]];
xtmp = x[i][0];
ytmp = x[i][1];
ztmp = x[i][2];
fxtmp = fytmp = fztmp = 0.0;
iq = q[i];
NCo[i] = 0;
nj = 0;
iparam_i = elem2param[itype][itype][itype];
// self energy, only on i atom
yaself = self(&params[iparam_i],iq,potal);
if (EVFLAG) ev_tally_thr(this,i,i,nlocal,0,yaself,
0.0,0.0,0.0,0.0,0.0,thr);
// two-body interactions (long and short repulsive)
jlist = firstneigh[i];
jnum = numneigh[i];
sht_jlist = sht_first[i];
sht_jnum = sht_num[i];
for (jj = 0; jj < jnum; jj++) {
j = jlist[jj];
j &= NEIGHMASK;
jtag = tag[j];
if (itag > jtag) {
if ((itag+jtag) % 2 == 0) continue;
} else if (itag < jtag) {
if ((itag+jtag) % 2 == 1) continue;
} else {
if (x[j][2] < ztmp) continue;
if (x[j][2] == ztmp && x[j][1] < ytmp) continue;
if (x[j][2] == ztmp && x[j][1] == ytmp && x[j][0] < xtmp) continue;
}
// Qj calculates 2-body Coulombic
jtype = map[type[j]];
jq = q[j];
delx = xtmp - x[j][0];
dely = ytmp - x[j][1];
delz = ztmp - x[j][2];
rsq = delx*delx + dely*dely + delz*delz;
iparam_ij = elem2param[itype][jtype][jtype];
// long range q-dependent
if (rsq > params[iparam_ij].lcutsq) continue;
inty = intype[itype][jtype];
// polynomial three-point interpolation
tri_point(rsq, mr1, mr2, mr3, sr1, sr2, sr3, itype);
// 1/r energy and forces
direct(inty,mr1,mr2,mr3,rsq,sr1,sr2,sr3,iq,jq,
potal,fac11,fac11e,vionij,fvionij);
// field correction to self energy
field(&params[iparam_ij],rsq,iq,jq,vionij,fvionij);
// polarization field
// sums up long range forces
fxtmp += delx*fvionij;
fytmp += dely*fvionij;
fztmp += delz*fvionij;
f[j][0] -= delx*fvionij;
f[j][1] -= dely*fvionij;
f[j][2] -= delz*fvionij;
if (EVFLAG)
ev_tally_thr(this,i,j,nlocal,/* newton_pair */ 1,
0.0,vionij,fvionij,delx,dely,delz,thr);
// short range q-independent
if (rsq > params[iparam_ij].cutsq) continue;
repulsive(&params[iparam_ij],rsq,fpair,EFLAG,evdwl,iq,jq);
// repulsion is pure two-body, sums up pair repulsive forces
fxtmp += delx*fpair;
fytmp += dely*fpair;
fztmp += delz*fpair;
f[j][0] -= delx*fpair;
f[j][1] -= dely*fpair;
f[j][2] -= delz*fpair;
if (EVFLAG)
ev_tally_thr(this,i,j,nlocal,/* newton_pair */ 1,
evdwl,0.0,fpair,delx,dely,delz,thr);
}
// accumulate coordination number information
if (cor_flag) {
int numcoor = 0;
for (jj = 0; jj < sht_jnum; jj++) {
j = sht_jlist[jj];
jtype = map[type[j]];
iparam_ij = elem2param[itype][jtype][jtype];
if(params[iparam_ij].hfocor > 0.0 ) {
delr1[0] = x[j][0] - xtmp;
delr1[1] = x[j][1] - ytmp;
delr1[2] = x[j][2] - ztmp;
rsq1 = vec3_dot(delr1,delr1);
if (rsq1 > params[iparam_ij].cutsq) continue;
++numcoor;
}
}
NCo[i] = numcoor;
}
// three-body interactions
// half i-j loop
for (jj = 0; jj < sht_jnum; jj++) {
j = sht_jlist[jj];
jtype = map[type[j]];
iparam_ij = elem2param[itype][jtype][jtype];
// this Qj for q-dependent BSi
jq = q[j];
delr1[0] = x[j][0] - xtmp;
delr1[1] = x[j][1] - ytmp;
delr1[2] = x[j][2] - ztmp;
rsq1 = vec3_dot(delr1,delr1);
if (rsq1 > params[iparam_ij].cutsq) continue;
nj ++;
// accumulate bondorder zeta for each i-j interaction via loop over k
fjxtmp = fjytmp = fjztmp = 0.0;
zeta_ij = 0.0;
cuo_flag1 = 0; cuo_flag2 = 0;
for (kk = 0; kk < sht_jnum; kk++) {
k = sht_jlist[kk];
if (j == k) continue;
ktype = map[type[k]];
iparam_ijk = elem2param[itype][jtype][ktype];
delr2[0] = x[k][0] - xtmp;
delr2[1] = x[k][1] - ytmp;
delr2[2] = x[k][2] - ztmp;
rsq2 = vec3_dot(delr2,delr2);
if (rsq2 > params[iparam_ijk].cutsq) continue;
zeta_ij += zeta(&params[iparam_ijk],rsq1,rsq2,delr1,delr2);
if (params[iparam_ijk].hfocor == -2.0) cuo_flag1 = 1;
if (params[iparam_ijk].hfocor == -1.0) cuo_flag2 = 1;
}
if (cuo_flag1 && cuo_flag2) cuo_flag = 1;
else cuo_flag = 0;
force_zeta(&params[iparam_ij],EFLAG,i,nj,rsq1,zeta_ij,
iq,jq,fpair,prefactor,evdwl);
// over-coordination correction for HfO2
if (cor_flag && NCo[i] != 0)
Over_cor(&params[iparam_ij],rsq1,NCo[i],Eov, Fov);
evdwl += Eov;
fpair += Fov;
fxtmp += delr1[0]*fpair;
fytmp += delr1[1]*fpair;
fztmp += delr1[2]*fpair;
fjxtmp -= delr1[0]*fpair;
fjytmp -= delr1[1]*fpair;
fjztmp -= delr1[2]*fpair;
if (EVFLAG) ev_tally_thr(this,i,j,nlocal,/* newton_pair */ 1,evdwl,0.0,
-fpair,-delr1[0],-delr1[1],-delr1[2],thr);
// attractive term via loop over k (3-body forces)
for (kk = 0; kk < sht_jnum; kk++) {
k = sht_jlist[kk];
if (j == k) continue;
ktype = map[type[k]];
iparam_ijk = elem2param[itype][jtype][ktype];
delr2[0] = x[k][0] - xtmp;
delr2[1] = x[k][1] - ytmp;
delr2[2] = x[k][2] - ztmp;
rsq2 = vec3_dot(delr2,delr2);
if (rsq2 > params[iparam_ijk].cutsq) continue;
for (rsc = 0; rsc < 3; rsc++)
fi[rsc] = fj[rsc] = fk[rsc] = 0.0;
attractive(&params[iparam_ijk],prefactor,
rsq1,rsq2,delr1,delr2,fi,fj,fk);
// 3-body LP and BB correction and forces
elp_ij = elp(&params[iparam_ijk],rsq1,rsq2,delr1,delr2);
flp(&params[iparam_ijk],rsq1,rsq2,delr1,delr2,filp,fjlp,fklp);
fxtmp += fi[0] + filp[0];
fytmp += fi[1] + filp[1];
fztmp += fi[2] + filp[2];
fjxtmp += fj[0] + fjlp[0];
fjytmp += fj[1] + fjlp[1];
fjztmp += fj[2] + fjlp[2];
f[k][0] += fk[0] + fklp[0];
f[k][1] += fk[1] + fklp[1];
f[k][2] += fk[2] + fklp[2];
if (EVFLAG)
ev_tally_thr(this,i,j,nlocal,/* newton_pair */ 1,
elp_ij,0.0,0.0,0.0,0.0,0.0, thr);
if (VFLAG_ATOM) v_tally3_thr(i,j,k,fj,fk,delr1,delr2,thr);
}
f[j][0] += fjxtmp;
f[j][1] += fjytmp;
f[j][2] += fjztmp;
}
f[i][0] += fxtmp;
f[i][1] += fytmp;
f[i][2] += fztmp;
if (cuo_flag) params[iparam_i].cutsq *= 0.65;
}
cuo_flag = 0;
}
/* ---------------------------------------------------------------------- */
double PairCombOMP::yasu_char(double *qf_fix, int &igroup)
{
int ii;
double potal,fac11,fac11e;
const double * const * const x = atom->x;
const double * const q = atom->q;
const int * const type = atom->type;
const tagint * const tag = atom->tag;
const int inum = list->inum;
const int * const ilist = list->ilist;
const int * const numneigh = list->numneigh;
const int * const * const firstneigh = list->firstneigh;
const int * const mask = atom->mask;
const int groupbit = group->bitmask[igroup];
qf = qf_fix;
for (ii = 0; ii < inum; ii++) {
const int i = ilist[ii];
if (mask[i] & groupbit)
qf[i] = 0.0;
}
// communicating charge force to all nodes, first forward then reverse
comm->forward_comm_pair(this);
// self energy correction term: potal
potal_calc(potal,fac11,fac11e);
// loop over full neighbor list of my atoms
#if defined(_OPENMP)
#pragma omp parallel for private(ii) default(none) shared(potal,fac11e)
#endif
for (ii = 0; ii < inum; ii ++) {
double fqi,fqj,fqij,fqji,fqjj,delr1[3];
double sr1,sr2,sr3;
int mr1,mr2,mr3;
const int i = ilist[ii];
const tagint itag = tag[i];
int nj = 0;
if (mask[i] & groupbit) {
fqi = fqj = fqij = fqji = fqjj = 0.0; // should not be needed.
int itype = map[type[i]];
const double xtmp = x[i][0];
const double ytmp = x[i][1];
const double ztmp = x[i][2];
const double iq = q[i];
const int iparam_i = elem2param[itype][itype][itype];
// charge force from self energy
fqi = qfo_self(&params[iparam_i],iq,potal);
// two-body interactions
const int * const jlist = firstneigh[i];
const int jnum = numneigh[i];
for (int jj = 0; jj < jnum; jj++) {
const int j = jlist[jj] & NEIGHMASK;
const tagint jtag = tag[j];
if (itag > jtag) {
if ((itag+jtag) % 2 == 0) continue;
} else if (itag < jtag) {
if ((itag+jtag) % 2 == 1) continue;
} else {
if (x[j][2] < ytmp) continue;
if (x[j][2] == ztmp && x[j][1] < ytmp) continue;
if (x[j][2] == ztmp && x[j][1] == ytmp && x[j][0] < xtmp) continue;
}
const int jtype = map[type[j]];
double jq = q[j];
delr1[0] = x[j][0] - xtmp;
delr1[1] = x[j][1] - ytmp;
delr1[2] = x[j][2] - ztmp;
double rsq1 = vec3_dot(delr1,delr1);
const int iparam_ij = elem2param[itype][jtype][jtype];
// long range q-dependent
if (rsq1 > params[iparam_ij].lcutsq) continue;
const int inty = intype[itype][jtype];
// polynomial three-point interpolation
tri_point(rsq1,mr1,mr2,mr3,sr1,sr2,sr3,itype);
// 1/r charge forces
qfo_direct(inty,mr1,mr2,mr3,rsq1,sr1,sr2,sr3,fac11e,fqij);
// field correction to self energy and charge force
qfo_field(&params[iparam_ij],rsq1,iq,jq,fqji,fqjj);
fqi += jq * fqij + fqji;
#if defined(_OPENMP)
#pragma omp atomic
#endif
qf[j] += (iq * fqij + fqjj);
}
// three-body interactions
for (int jj = 0; jj < jnum; jj++) {
const int j = jlist[jj] & NEIGHMASK;
const int jtype = map[type[j]];
const double jq = q[j];
delr1[0] = x[j][0] - xtmp;
delr1[1] = x[j][1] - ytmp;
delr1[2] = x[j][2] - ztmp;
double rsq1 = vec3_dot(delr1,delr1);
const int iparam_ij = elem2param[itype][jtype][jtype];
if (rsq1 > params[iparam_ij].cutsq) continue;
nj ++;
// charge force in Aij and Bij
qfo_short(&params[iparam_ij],i,nj,rsq1,iq,jq,fqij,fqjj);
fqi += fqij;
#if defined(_OPENMP)
#pragma omp atomic
#endif
qf[j] += fqjj;
}
#if defined(_OPENMP)
#pragma omp atomic
#endif
qf[i] += fqi;
}
}
comm->reverse_comm_pair(this);
// sum charge force on each node and return it
double eneg = 0.0;
for (ii = 0; ii < inum; ii++) {
const int i = ilist[ii];
if (mask[i] & groupbit)
eneg += qf[i];
}
double enegtot;
MPI_Allreduce(&eneg,&enegtot,1,MPI_DOUBLE,MPI_SUM,world);
return enegtot;
}
/* ---------------------------------------------------------------------- */
double PairCombOMP::memory_usage()
{
double bytes = memory_usage_thr();
bytes += PairComb::memory_usage();
return bytes;
}
/* ---------------------------------------------------------------------- */
void PairCombOMP::Short_neigh_thr()
{
if (atom->nmax > nmax) {
nmax = atom->nmax;
memory->sfree(sht_first);
sht_first = (int **) memory->smalloc(nmax*sizeof(int *),
"pair:sht_first");
memory->grow(sht_num,nmax,"pair:sht_num");
memory->grow(NCo,nmax,"pair:NCo");
memory->grow(bbij,nmax,MAXNEIGH,"pair:bbij");
}
const int nthreads = comm->nthreads;
#if defined(_OPENMP)
#pragma omp parallel default(none)
#endif
{
int nj,*neighptrj;
int *ilist,*jlist,*numneigh,**firstneigh;
int jnum,i,j,ii,jj;
double xtmp,ytmp,ztmp,rsq,delrj[3];
double **x = atom->x;
const int inum = list->inum;
ilist = list->ilist;
numneigh = list->numneigh;
firstneigh = list->firstneigh;
#if defined(_OPENMP)
const int tid = omp_get_thread_num();
#else
const int tid = 0;
#endif
const int iidelta = 1 + inum/nthreads;
const int iifrom = tid*iidelta;
const int iito = ((iifrom + iidelta) > inum) ? inum : (iifrom+iidelta);
// each thread has its own page allocator
MyPage<int> &ipg = ipage[tid];
ipg.reset();
// create Comb neighbor list
for (ii = iifrom; ii < iito; ii++) {
i = ilist[ii];
nj = 0;
neighptrj = ipg.vget();
xtmp = x[i][0];
ytmp = x[i][1];
ztmp = x[i][2];
jlist = firstneigh[i];
jnum = numneigh[i];
for (jj = 0; jj < jnum; jj++) {
j = jlist[jj];
j &= NEIGHMASK;
delrj[0] = xtmp - x[j][0];
delrj[1] = ytmp - x[j][1];
delrj[2] = ztmp - x[j][2];
rsq = vec3_dot(delrj,delrj);
if (rsq > cutmin) continue;
neighptrj[nj++] = j;
}
sht_first[i] = neighptrj;
sht_num[i] = nj;
ipg.vgot(nj);
if (ipg.status())
error->one(FLERR,"Neighbor list overflow, boost neigh_modify one");
}
}
}
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