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integrate.cpp
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Wed, Sep 4, 18:17

integrate.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 <stdlib.h>
#include "integrate.h"
#include "update.h"
#include "force.h"
#include "pair.h"
#include "kspace.h"
#include "modify.h"
#include "compute.h"
using namespace LAMMPS_NS;
/* ---------------------------------------------------------------------- */
Integrate::Integrate(LAMMPS *lmp, int narg, char **arg) : Pointers(lmp)
{
elist_global = elist_atom = NULL;
vlist_global = vlist_atom = NULL;
external_force_clear = 0;
}
/* ---------------------------------------------------------------------- */
Integrate::~Integrate()
{
delete [] elist_global;
delete [] elist_atom;
delete [] vlist_global;
delete [] vlist_atom;
}
/* ---------------------------------------------------------------------- */
void Integrate::init()
{
update->atimestep = update->ntimestep;
// allow pair and Kspace compute() to be turned off via modify flags
if (force->pair && force->pair->compute_flag) pair_compute_flag = 1;
else pair_compute_flag = 0;
if (force->kspace && force->kspace->compute_flag) kspace_compute_flag = 1;
else kspace_compute_flag = 0;
// should add checks:
// for any acceleration package that has its own integrate/minimize
// in case input script has reset the run or minimize style explicitly
// e.g. invalid to have kokkos pair style with non-kokkos verlet
// but OK to have kokkos verlet with non kokkos pair style (just warn)
// ditto for USER-CUDA package verlet with their pair, fix, etc
// making these checks would require all the pair, fix, etc styles have
// cuda, kokkos, intel flags
}
/* ----------------------------------------------------------------------
setup lists of computes for global and per-atom PE and pressure
------------------------------------------------------------------------- */
void Integrate::ev_setup()
{
delete [] elist_global;
delete [] elist_atom;
delete [] vlist_global;
delete [] vlist_atom;
elist_global = elist_atom = NULL;
vlist_global = vlist_atom = NULL;
nelist_global = nelist_atom = 0;
nvlist_global = nvlist_atom = 0;
for (int i = 0; i < modify->ncompute; i++) {
if (modify->compute[i]->peflag) nelist_global++;
if (modify->compute[i]->peatomflag) nelist_atom++;
if (modify->compute[i]->pressflag) nvlist_global++;
if (modify->compute[i]->pressatomflag) nvlist_atom++;
}
if (nelist_global) elist_global = new Compute*[nelist_global];
if (nelist_atom) elist_atom = new Compute*[nelist_atom];
if (nvlist_global) vlist_global = new Compute*[nvlist_global];
if (nvlist_atom) vlist_atom = new Compute*[nvlist_atom];
nelist_global = nelist_atom = 0;
nvlist_global = nvlist_atom = 0;
for (int i = 0; i < modify->ncompute; i++) {
if (modify->compute[i]->peflag)
elist_global[nelist_global++] = modify->compute[i];
if (modify->compute[i]->peatomflag)
elist_atom[nelist_atom++] = modify->compute[i];
if (modify->compute[i]->pressflag)
vlist_global[nvlist_global++] = modify->compute[i];
if (modify->compute[i]->pressatomflag)
vlist_atom[nvlist_atom++] = modify->compute[i];
}
}
/* ----------------------------------------------------------------------
set eflag,vflag for current iteration
invoke matchstep() on all timestep-dependent computes to clear their arrays
eflag/vflag based on computes that need info on this ntimestep
eflag = 0 = no energy computation
eflag = 1 = global energy only
eflag = 2 = per-atom energy only
eflag = 3 = both global and per-atom energy
vflag = 0 = no virial computation (pressure)
vflag = 1 = global virial with pair portion via sum of pairwise interactions
vflag = 2 = global virial with pair portion via F dot r including ghosts
vflag = 4 = per-atom virial only
vflag = 5 or 6 = both global and per-atom virial
------------------------------------------------------------------------- */
void Integrate::ev_set(bigint ntimestep)
{
int i,flag;
flag = 0;
int eflag_global = 0;
for (i = 0; i < nelist_global; i++)
if (elist_global[i]->matchstep(ntimestep)) flag = 1;
if (flag) eflag_global = 1;
flag = 0;
int eflag_atom = 0;
for (i = 0; i < nelist_atom; i++)
if (elist_atom[i]->matchstep(ntimestep)) flag = 1;
if (flag) eflag_atom = 2;
if (eflag_global) update->eflag_global = ntimestep;
if (eflag_atom) update->eflag_atom = ntimestep;
eflag = eflag_global + eflag_atom;
flag = 0;
int vflag_global = 0;
for (i = 0; i < nvlist_global; i++)
if (vlist_global[i]->matchstep(ntimestep)) flag = 1;
if (flag) vflag_global = virial_style;
flag = 0;
int vflag_atom = 0;
for (i = 0; i < nvlist_atom; i++)
if (vlist_atom[i]->matchstep(ntimestep)) flag = 1;
if (flag) vflag_atom = 4;
if (vflag_global) update->vflag_global = ntimestep;
if (vflag_atom) update->vflag_atom = ntimestep;
vflag = vflag_global + vflag_atom;
}

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