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pair_hybrid.cpp
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Wed, Jun 5, 23:38

pair_hybrid.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
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.
------------------------------------------------------------------------- */
#include "math.h"
#include "string.h"
#include "ctype.h"
#include "pair_hybrid.h"
#include "atom.h"
#include "force.h"
#include "pair.h"
#include "neighbor.h"
#include "neigh_request.h"
#include "update.h"
#include "comm.h"
#include "memory.h"
#include "error.h"
using namespace LAMMPS_NS;
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#define MAX(a,b) ((a) > (b) ? (a) : (b))
/* ---------------------------------------------------------------------- */
PairHybrid::PairHybrid(LAMMPS *lmp) : Pair(lmp)
{
nstyles = 0;
}
/* ---------------------------------------------------------------------- */
PairHybrid::~PairHybrid()
{
if (nstyles) {
for (int m = 0; m < nstyles; m++) delete styles[m];
delete [] styles;
for (int m = 0; m < nstyles; m++) delete [] keywords[m];
delete [] keywords;
}
if (allocated) {
memory->destroy_2d_int_array(setflag);
memory->destroy_2d_double_array(cutsq);
memory->destroy_2d_int_array(nmap);
memory->destroy_3d_int_array(map);
}
}
/* ----------------------------------------------------------------------
call each sub-style's compute function
accumulate sub-style energy/virial in hybrid's energy/virial
for vflag = 1:
each sub-style computes own virial[6]
sum sub-style virial[6] to hybrid's virial[6]
for vflag = 2:
call sub-style compute() with vflag % 2
to prevent sub-style from calling virial_compute()
hybrid calls virial_compute() on final accumulated f
------------------------------------------------------------------------- */
void PairHybrid::compute(int eflag, int vflag)
{
int m,n;
eng_vdwl = eng_coul = 0.0;
if (vflag) for (n = 0; n < 6; n++) virial[n] = 0.0;
for (m = 0; m < nstyles; m++) {
styles[m]->compute(eflag,vflag % 2);
if (eflag) {
eng_vdwl += styles[m]->eng_vdwl;
eng_coul += styles[m]->eng_coul;
}
if (vflag == 1) for (n = 0; n < 6; n++) virial[n] += styles[m]->virial[n];
}
if (vflag == 2) virial_compute();
}
/* ---------------------------------------------------------------------- */
void PairHybrid::compute_inner()
{
for (int m = 0; m < nstyles; m++)
if (styles[m]->respa_enable) styles[m]->compute_inner();
}
/* ---------------------------------------------------------------------- */
void PairHybrid::compute_middle()
{
for (int m = 0; m < nstyles; m++)
if (styles[m]->respa_enable) styles[m]->compute_middle();
}
/* ---------------------------------------------------------------------- */
void PairHybrid::compute_outer(int eflag, int vflag)
{
for (int m = 0; m < nstyles; m++)
if (styles[m]->respa_enable) styles[m]->compute_outer(eflag,vflag);
}
/* ----------------------------------------------------------------------
allocate all arrays
------------------------------------------------------------------------- */
void PairHybrid::allocate()
{
allocated = 1;
int n = atom->ntypes;
setflag = memory->create_2d_int_array(n+1,n+1,"pair:setflag");
for (int i = 1; i <= n; i++)
for (int j = i; j <= n; j++)
setflag[i][j] = 0;
cutsq = memory->create_2d_double_array(n+1,n+1,"pair:cutsq");
nmap = memory->create_2d_int_array(n+1,n+1,"pair:nmap");
map = memory->create_3d_int_array(n+1,n+1,nstyles,"pair:map");
for (int i = 1; i <= n; i++)
for (int j = i; j <= n; j++)
nmap[i][j] = 0;
}
/* ----------------------------------------------------------------------
create one pair style for each arg in list
------------------------------------------------------------------------- */
void PairHybrid::settings(int narg, char **arg)
{
int i,m,istyle;
if (narg < 1) error->all("Illegal pair_style command");
// delete old lists, since cannot just change settings
if (nstyles) {
for (m = 0; m < nstyles; m++) delete styles[m];
delete [] styles;
for (m = 0; m < nstyles; m++) delete [] keywords[m];
delete [] keywords;
}
if (allocated) {
memory->destroy_2d_int_array(setflag);
memory->destroy_2d_double_array(cutsq);
memory->destroy_2d_int_array(nmap);
memory->destroy_3d_int_array(map);
}
allocated = 0;
// count sub-styles by skipping numeric args
// one exception is 1st arg of style "table", which is non-numeric word
nstyles = 0;
i = 0;
while (i < narg) {
if (strcmp(arg[i],"table") == 0) i++;
i++;
while (i < narg && !isalpha(arg[i][0])) i++;
nstyles++;
}
// allocate list of sub-styles
styles = new Pair*[nstyles];
keywords = new char*[nstyles];
// allocate each sub-style and call its settings() with subset of args
// define subset of args for a sub-style by skipping numeric args
// one exception is 1st arg of style "table", which is non-numeric word
nstyles = 0;
i = 0;
while (i < narg) {
for (m = 0; m < nstyles; m++)
if (strcmp(arg[i],keywords[m]) == 0)
error->all("Pair style hybrid cannot use same pair style twice");
if (strcmp(arg[i],"hybrid") == 0)
error->all("Pair style hybrid cannot have hybrid as an argument");
if (strcmp(arg[i],"none") == 0)
error->all("Pair style hybrid cannot have none as an argument");
styles[nstyles] = force->new_pair(arg[i]);
keywords[nstyles] = new char[strlen(arg[i])+1];
strcpy(keywords[nstyles],arg[i]);
istyle = i;
if (strcmp(arg[i],"table") == 0) i++;
i++;
while (i < narg && !isalpha(arg[i][0])) i++;
styles[nstyles]->settings(i-istyle-1,&arg[istyle+1]);
nstyles++;
}
// set comm_forward, comm_reverse to max of any sub-style
for (m = 0; m < nstyles; m++) {
if (styles[m]) comm_forward = MAX(comm_forward,styles[m]->comm_forward);
if (styles[m]) comm_reverse = MAX(comm_reverse,styles[m]->comm_reverse);
}
// single_enable = 0 if any sub-style = 0
// respa_enable = 1 if any sub-style is set
for (m = 0; m < nstyles; m++)
if (styles[m]->single_enable == 0) single_enable = 0;
for (m = 0; m < nstyles; m++)
if (styles[m]->respa_enable) respa_enable = 1;
}
/* ----------------------------------------------------------------------
set coeffs for one or more type pairs
------------------------------------------------------------------------- */
void PairHybrid::coeff(int narg, char **arg)
{
if (narg < 3) error->all("Incorrect args for pair coefficients");
if (!allocated) allocate();
int ilo,ihi,jlo,jhi;
force->bounds(arg[0],atom->ntypes,ilo,ihi);
force->bounds(arg[1],atom->ntypes,jlo,jhi);
// 3rd arg = pair sub-style name
// allow for "none" as valid sub-style name
int m;
for (m = 0; m < nstyles; m++)
if (strcmp(arg[2],keywords[m]) == 0) break;
int none = 0;
if (m == nstyles) {
if (strcmp(arg[2],"none") == 0) none = 1;
else error->all("Pair coeff for hybrid has invalid style");
}
// move 1st/2nd args to 2nd/3rd args
sprintf(arg[2],"%s",arg[1]);
sprintf(arg[1],"%s",arg[0]);
// invoke sub-style coeff() starting with 1st arg
if (!none) styles[m]->coeff(narg-1,&arg[1]);
// if sub-style only allows one pair coeff call (with * * and type mapping)
// then unset setflag/map assigned to that style before setting it below
// in case pair coeff for this sub-style is being called for 2nd time
if (!none && styles[m]->one_coeff)
for (int i = 1; i <= atom->ntypes; i++)
for (int j = i; j <= atom->ntypes; j++)
if (nmap[i][j] && map[i][j][0] == m) {
setflag[i][j] = 0;
nmap[i][j] = 0;
}
// set setflag and which type pairs map to which sub-style
// if sub-style is none: set hybrid subflag, wipe out map
// else: set hybrid setflag & map only if substyle setflag is set
// previous mappings are wiped out
int count = 0;
for (int i = ilo; i <= ihi; i++) {
for (int j = MAX(jlo,i); j <= jhi; j++) {
if (none) {
setflag[i][j] = 1;
nmap[i][j] = 0;
count++;
} else if (styles[m]->setflag[i][j]) {
setflag[i][j] = 1;
nmap[i][j] = 1;
map[i][j][0] = m;
count++;
}
}
}
if (count == 0) error->all("Incorrect args for pair coefficients");
}
/* ----------------------------------------------------------------------
init specific to this pair style
------------------------------------------------------------------------- */
void PairHybrid::init_style()
{
int i,m,itype,jtype,used,istyle,skip;
// error if a sub-style is not used
int ntypes = atom->ntypes;
for (istyle = 0; istyle < nstyles; istyle++) {
used = 0;
for (itype = 1; itype <= ntypes; itype++)
for (jtype = itype; jtype <= ntypes; jtype++)
for (m = 0; m < nmap[itype][jtype]; m++)
if (map[itype][jtype][m] == istyle) used = 1;
if (used == 0) error->all("Pair hybrid sub-style is not used");
}
// each sub-style makes its neighbor list request(s)
for (istyle = 0; istyle < nstyles; istyle++) styles[istyle]->init_style();
// create skip lists for each neigh request
// any kind of list can have its skip flag set at this stage
for (i = 0; i < neighbor->nrequest; i++) {
// find associated sub-style
for (istyle = 0; istyle < nstyles; istyle++)
if (styles[istyle] == neighbor->requests[i]->requestor) break;
// allocate iskip and ijskip
// initialize so as to skip all pair types
// set ijskip = 0 if type pair matches any entry in sub-style map
// set ijskip = 0 if mixing will assign type pair to this sub-style
// will occur if both I,I and J,J are assigned to single sub-style
// and sub-style for both I,I and J,J match istyle
// set iskip = 1 only if all ijskip for itype are 1
int *iskip = new int[ntypes+1];
int **ijskip = memory->create_2d_int_array(ntypes+1,ntypes+1,
"pair_hybrid:ijskip");
for (itype = 1; itype <= ntypes; itype++)
for (jtype = 1; jtype <= ntypes; jtype++)
ijskip[itype][jtype] = 1;
for (itype = 1; itype <= ntypes; itype++)
for (jtype = itype; jtype <= ntypes; jtype++) {
for (m = 0; m < nmap[itype][jtype]; m++)
if (map[itype][jtype][m] == istyle)
ijskip[itype][jtype] = ijskip[jtype][itype] = 0;
if (nmap[itype][itype] == 1 && map[itype][itype][0] == istyle &&
nmap[jtype][jtype] == 1 && map[jtype][jtype][0] == istyle)
ijskip[itype][jtype] = ijskip[jtype][itype] = 0;
}
for (itype = 1; itype <= ntypes; itype++) {
iskip[itype] = 1;
for (jtype = 1; jtype <= ntypes; jtype++)
if (ijskip[itype][jtype] == 0) iskip[itype] = 0;
}
// if any skipping occurs
// set request->skip and copy iskip and ijskip into request
// else delete iskip and ijskip
skip = 0;
for (itype = 1; itype <= ntypes; itype++)
for (jtype = 1; jtype <= ntypes; jtype++)
if (ijskip[itype][jtype] == 1) skip = 1;
if (skip) {
neighbor->requests[i]->skip = 1;
neighbor->requests[i]->iskip = iskip;
neighbor->requests[i]->ijskip = ijskip;
} else {
delete [] iskip;
memory->destroy_2d_int_array(ijskip);
}
}
// combine sub-style neigh list requests and create new ones if needed
modify_requests();
}
/* ----------------------------------------------------------------------
init for one type pair i,j and corresponding j,i
------------------------------------------------------------------------- */
double PairHybrid::init_one(int i, int j)
{
// if I,J is not set explicitly:
// perform mixing only if I,I sub-style = J,J sub-style
// also require I,I and J,J both are assigned to single sub-style
if (setflag[i][j] == 0) {
if (nmap[i][i] != 1 || nmap[j][j] != 1 || map[i][i][0] != map[j][j][0])
error->one("All pair coeffs are not set");
nmap[i][j] = 1;
map[i][j][0] = map[i][i][0];
}
// call init/mixing for all sub-styles of I,J
// set cutsq in sub-style just as pair::init_one() does
// sum tail corrections for I,J
// return max cutoff of all sub-styles assigned to I,J
// if no sub-styles assigned to I,J (pair_coeff none), cutmax = 0.0 returned
double cutmax = 0.0;
if (tail_flag) etail_ij = ptail_ij = 0.0;
for (int k = 0; k < nmap[i][j]; k++) {
map[j][i][k] = map[i][j][k];
double cut = styles[map[i][j][k]]->init_one(i,j);
styles[map[i][j][k]]->cutsq[i][j] =
styles[map[i][j][k]]->cutsq[j][i] = cut*cut;
if (tail_flag) {
etail_ij += styles[map[i][j][k]]->etail_ij;
ptail_ij += styles[map[i][j][k]]->ptail_ij;
}
cutmax = MAX(cutmax,cut);
}
return cutmax;
}
/* ----------------------------------------------------------------------
combine sub-style neigh list requests and create new ones if needed
------------------------------------------------------------------------- */
void PairHybrid::modify_requests()
{
int i,j;
NeighRequest *irq,*jrq;
// if list is skip list and not copy, look for non-skip list of same kind
// if one exists, point at that one
// else make new non-skip request of same kind and point at that one
// don't bother to set ID for new request, since pair hybrid ignores list
// only exception is half_from_full:
// ignore it, turn off skip, since it will derive from its skip parent
// after possible new request creation, unset skip flag and otherlist
// for these derived lists: granhistory, rRESPA inner/middle
// this prevents neighbor from treating them as skip lists
// copy list check is for pair style = hybrid/overlay
// which invokes this routine
for (i = 0; i < neighbor->nrequest; i++) {
irq = neighbor->requests[i];
if (irq->skip == 0 || irq->copy) continue;
if (irq->half_from_full) {
irq->skip = 0;
continue;
}
for (j = 0; j < neighbor->nrequest; j++) {
jrq = neighbor->requests[j];
if (irq->same_kind(jrq) && jrq->skip == 0) break;
}
if (j < neighbor->nrequest) irq->otherlist = j;
else {
int newrequest = neighbor->request(this);
neighbor->requests[newrequest]->copy_kind(irq);
neighbor->requests[newrequest]->dnum = irq->dnum;
irq->otherlist = newrequest;
}
if (irq->granhistory || irq->respainner || irq->respamiddle) {
irq->skip = 0;
irq->otherlist = -1;
}
}
}
/* ----------------------------------------------------------------------
proc 0 writes to restart file
------------------------------------------------------------------------- */
void PairHybrid::write_restart(FILE *fp)
{
fwrite(&nstyles,sizeof(int),1,fp);
// each sub-style writes its settings, but no coeff info
int n;
for (int m = 0; m < nstyles; m++) {
n = strlen(keywords[m]) + 1;
fwrite(&n,sizeof(int),1,fp);
fwrite(keywords[m],sizeof(char),n,fp);
styles[m]->write_restart_settings(fp);
}
}
/* ----------------------------------------------------------------------
proc 0 reads from restart file, bcasts
------------------------------------------------------------------------- */
void PairHybrid::read_restart(FILE *fp)
{
int me = comm->me;
if (me == 0) fread(&nstyles,sizeof(int),1,fp);
MPI_Bcast(&nstyles,1,MPI_INT,0,world);
styles = new Pair*[nstyles];
keywords = new char*[nstyles];
// each sub-style is created via new_pair()
// each reads its settings, but no coeff info
int n;
for (int m = 0; m < nstyles; m++) {
if (me == 0) fread(&n,sizeof(int),1,fp);
MPI_Bcast(&n,1,MPI_INT,0,world);
keywords[m] = new char[n];
if (me == 0) fread(keywords[m],sizeof(char),n,fp);
MPI_Bcast(keywords[m],n,MPI_CHAR,0,world);
styles[m] = force->new_pair(keywords[m]);
styles[m]->read_restart_settings(fp);
}
}
/* ----------------------------------------------------------------------
call sub-style to compute single interaction
since overlay could have multiple sub-styles, sum results explicitly
------------------------------------------------------------------------- */
void PairHybrid::single(int i, int j, int itype, int jtype,
double rsq, double factor_coul, double factor_lj,
int eflag, One &one)
{
if (nmap[itype][jtype] == 0)
error->one("Invoked pair single on pair style none");
double fforce = 0.0;
double eng_vdwl = 0.0;
double eng_coul = 0.0;
for (int m = 0; m < nmap[itype][jtype]; m++) {
styles[map[itype][jtype][m]]->
single(i,j,itype,jtype,rsq,factor_coul,factor_lj,eflag,one);
fforce += one.fforce;
eng_vdwl += one.eng_vdwl;
eng_coul += one.eng_coul;
}
one.fforce = fforce;
one.eng_vdwl = eng_vdwl;
one.eng_coul = eng_coul;
}
/* ----------------------------------------------------------------------
call sub-style to compute single embedding interaction
since overlay could have multiple sub-styles, sum results explicitly
------------------------------------------------------------------------- */
void PairHybrid::single_embed(int i, int itype, double &phi)
{
if (nmap[itype][itype] == 0)
error->one("Invoked pair single on pair style none");
phi = 0.0;
double phi_single;
for (int m = 0; m < nmap[itype][itype]; m++) {
styles[map[itype][itype][m]]->single_embed(i,itype,phi_single);
phi += phi_single;
}
}
/* ----------------------------------------------------------------------
modify parameters of the pair style
call modify_params of PairHybrid
also pass command args to each sub-style of hybrid
------------------------------------------------------------------------- */
void PairHybrid::modify_params(int narg, char **arg)
{
Pair::modify_params(narg,arg);
for (int m = 0; m < nstyles; m++) styles[m]->modify_params(narg,arg);
}
/* ----------------------------------------------------------------------
memory usage of each sub-style
------------------------------------------------------------------------- */
double PairHybrid::memory_usage()
{
double bytes = 0.0;
for (int m = 0; m < nstyles; m++) bytes += styles[m]->memory_usage();
return bytes;
}
/* ----------------------------------------------------------------------
extract a ptr to a particular quantity stored by pair
pass request thru to sub-styles
return first non-NULL result except for cut_coul request
for cut_coul, insure all non-NULL results are equal since required by Kspace
------------------------------------------------------------------------- */
void *PairHybrid::extract(char *str)
{
void *cutptr = NULL;
void *ptr;
double cutvalue;
for (int m = 0; m < nstyles; m++) {
ptr = styles[m]->extract(str);
if (ptr && strcmp(str,"cut_coul") == 0) {
double *p_newvalue = (double *) ptr;
double newvalue = *p_newvalue;
if (cutptr && newvalue != cutvalue)
error->all("Coulomb cutoffs of pair hybrid sub-styles do not match");
cutptr = ptr;
cutvalue = newvalue;
} else if (ptr) return ptr;
}
if (strcmp(str,"cut_coul") == 0) return cutptr;
return NULL;
}

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