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fix_respa.cpp
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Wed, Oct 16, 14:44

fix_respa.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 "fix_respa.h"
#include "atom.h"
#include "memory.h"
#include "error.h"
using namespace LAMMPS_NS;
/* ---------------------------------------------------------------------- */
FixRespa::FixRespa(LAMMPS *lmp, int narg, char **arg) :
Fix(lmp, narg, arg)
{
// nlevels = # of rRESPA levels
nlevels = atoi(arg[3]);
// perform initial allocation of atom-based arrays
// register with Atom class
f_level = NULL;
grow_arrays(atom->nmax);
atom->add_callback(0);
}
/* ---------------------------------------------------------------------- */
FixRespa::~FixRespa()
{
// unregister callbacks to this fix from Atom class
atom->delete_callback(id,0);
// delete locally stored arrays
memory->destroy_3d_double_array(f_level);
}
/* ---------------------------------------------------------------------- */
int FixRespa::setmask()
{
return 0;
}
/* ----------------------------------------------------------------------
memory usage of local atom-based arrays
------------------------------------------------------------------------- */
int FixRespa::memory_usage()
{
int bytes = atom->nmax*nlevels*3 * sizeof(double);
return bytes;
}
/* ----------------------------------------------------------------------
allocate local atom-based arrays
------------------------------------------------------------------------- */
void FixRespa::grow_arrays(int nmax)
{
f_level =
memory->grow_3d_double_array(f_level,nmax,nlevels,3,"fix_respa:f_level");
}
/* ----------------------------------------------------------------------
copy values within local atom-based arrays
------------------------------------------------------------------------- */
void FixRespa::copy_arrays(int i, int j)
{
for (int k = 0; k < nlevels; k++) {
f_level[j][k][0] = f_level[i][k][0];
f_level[j][k][1] = f_level[i][k][1];
f_level[j][k][2] = f_level[i][k][2];
}
}
/* ----------------------------------------------------------------------
pack values in local atom-based arrays for exchange with another proc
------------------------------------------------------------------------- */
int FixRespa::pack_exchange(int i, double *buf)
{
int m = 0;
for (int k = 0; k < nlevels; k++) {
buf[m++] = f_level[i][k][0];
buf[m++] = f_level[i][k][1];
buf[m++] = f_level[i][k][2];
}
return m;
}
/* ----------------------------------------------------------------------
unpack values in local atom-based arrays from exchange with another proc
------------------------------------------------------------------------- */
int FixRespa::unpack_exchange(int nlocal, double *buf)
{
int m = 0;
for (int k = 0; k < nlevels; k++) {
f_level[nlocal][k][0] = buf[m++];
f_level[nlocal][k][1] = buf[m++];
f_level[nlocal][k][2] = buf[m++];
}
return m;
}

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