377 lines
12 KiB
C++
377 lines
12 KiB
C++
/* ----------------------------------------------------------------------
|
|
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.
|
|
------------------------------------------------------------------------- */
|
|
|
|
/* ----------------------------------------------------------------------
|
|
Contributing Authors: Amulya K. Pervaje and Cody K. Addington,
|
|
(North Carolina State University)
|
|
Contact Email: amulyapervaje@gmail.com
|
|
------------------------------------------------------------------------- */
|
|
|
|
#include "temper_npt.h"
|
|
#include <cmath>
|
|
#include <cstring>
|
|
#include "universe.h"
|
|
#include "domain.h"
|
|
#include "atom.h"
|
|
#include "update.h"
|
|
#include "integrate.h"
|
|
#include "modify.h"
|
|
#include "compute.h"
|
|
#include "force.h"
|
|
#include "fix.h"
|
|
#include "random_park.h"
|
|
#include "finish.h"
|
|
#include "timer.h"
|
|
#include "error.h"
|
|
|
|
using namespace LAMMPS_NS;
|
|
|
|
#define TEMPER_DEBUG 0
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
TemperNPT::TemperNPT(LAMMPS *lmp) : Pointers(lmp) {}
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
TemperNPT::~TemperNPT()
|
|
{
|
|
MPI_Comm_free(&roots);
|
|
if (ranswap) delete ranswap;
|
|
delete ranboltz;
|
|
delete [] set_temp;
|
|
delete [] temp2world;
|
|
delete [] world2temp;
|
|
delete [] world2root;
|
|
}
|
|
|
|
/* ----------------------------------------------------------------------
|
|
perform tempering with inter-world swaps
|
|
------------------------------------------------------------------------- */
|
|
|
|
void TemperNPT::command(int narg, char **arg)
|
|
{
|
|
if (universe->nworlds == 1)
|
|
error->all(FLERR,"Must have more than one processor partition to temper");
|
|
if (domain->box_exist == 0)
|
|
error->all(FLERR,"temper/npt command before simulation box is defined");
|
|
if (narg != 7 && narg != 8)
|
|
error->universe_all(FLERR,"Illegal temper/npt command");
|
|
|
|
int nsteps = force->inumeric(FLERR,arg[0]);
|
|
nevery = force->inumeric(FLERR,arg[1]);
|
|
double temp = force->numeric(FLERR,arg[2]);
|
|
double press_set = force->numeric(FLERR,arg[6]);
|
|
|
|
for (whichfix = 0; whichfix < modify->nfix; whichfix++)
|
|
if (strcmp(arg[3],modify->fix[whichfix]->id) == 0) break;
|
|
if (whichfix == modify->nfix)
|
|
error->universe_all(FLERR,"Tempering fix ID is not defined");
|
|
|
|
seed_swap = force->inumeric(FLERR,arg[4]);
|
|
seed_boltz = force->inumeric(FLERR,arg[5]);
|
|
|
|
my_set_temp = universe->iworld;
|
|
if (narg == 8) my_set_temp = force->inumeric(FLERR,arg[6]);
|
|
|
|
// swap frequency must evenly divide total # of timesteps
|
|
|
|
if (nevery <= 0)
|
|
error->universe_all(FLERR,"Invalid frequency in temper/npt command");
|
|
nswaps = nsteps/nevery;
|
|
if (nswaps*nevery != nsteps)
|
|
error->universe_all(FLERR,"Non integer # of swaps in temper/npt command");
|
|
|
|
// fix style must be appropriate for temperature and pressure control,
|
|
// i.e. it needs to provide a working Fix::reset_target() and must also
|
|
// change the volume. This currently only applies to fix npt and
|
|
// fix rigid/npt variants
|
|
|
|
if ((strncmp(modify->fix[whichfix]->style,"npt",3) != 0)
|
|
&& (strncmp(modify->fix[whichfix]->style,"rigid/npt",9) != 0))
|
|
error->universe_all(FLERR,"Tempering temperature and pressure fix is not supported");
|
|
|
|
// setup for long tempering run
|
|
|
|
update->whichflag = 1;
|
|
update->nsteps = nsteps;
|
|
update->beginstep = update->firststep = update->ntimestep;
|
|
update->endstep = update->laststep = update->firststep + nsteps;
|
|
if (update->laststep < 0)
|
|
error->all(FLERR,"Too many timesteps");
|
|
|
|
lmp->init();
|
|
|
|
// local storage
|
|
|
|
me_universe = universe->me;
|
|
MPI_Comm_rank(world,&me);
|
|
nworlds = universe->nworlds;
|
|
iworld = universe->iworld;
|
|
boltz = force->boltz;
|
|
nktv2p = force->nktv2p;
|
|
|
|
// pe_compute = ptr to thermo_pe compute
|
|
// notify compute it will be called at first swap
|
|
|
|
int id = modify->find_compute("thermo_pe");
|
|
if (id < 0) error->all(FLERR,"Tempering could not find thermo_pe compute");
|
|
Compute *pe_compute = modify->compute[id];
|
|
pe_compute->addstep(update->ntimestep + nevery);
|
|
|
|
// create MPI communicator for root proc from each world
|
|
|
|
int color;
|
|
if (me == 0) color = 0;
|
|
else color = 1;
|
|
MPI_Comm_split(universe->uworld,color,0,&roots);
|
|
|
|
// RNGs for swaps and Boltzmann test
|
|
// warm up Boltzmann RNG
|
|
|
|
if (seed_swap) ranswap = new RanPark(lmp,seed_swap);
|
|
else ranswap = NULL;
|
|
ranboltz = new RanPark(lmp,seed_boltz + me_universe);
|
|
for (int i = 0; i < 100; i++) ranboltz->uniform();
|
|
|
|
// world2root[i] = global proc that is root proc of world i
|
|
|
|
world2root = new int[nworlds];
|
|
if (me == 0)
|
|
MPI_Allgather(&me_universe,1,MPI_INT,world2root,1,MPI_INT,roots);
|
|
MPI_Bcast(world2root,nworlds,MPI_INT,0,world);
|
|
|
|
// create static list of set temperatures
|
|
// allgather tempering arg "temp" across root procs
|
|
// bcast from each root to other procs in world
|
|
|
|
set_temp = new double[nworlds];
|
|
if (me == 0) MPI_Allgather(&temp,1,MPI_DOUBLE,set_temp,1,MPI_DOUBLE,roots);
|
|
MPI_Bcast(set_temp,nworlds,MPI_DOUBLE,0,world);
|
|
|
|
// create world2temp only on root procs from my_set_temp
|
|
// create temp2world on root procs from world2temp,
|
|
// then bcast to all procs within world
|
|
|
|
world2temp = new int[nworlds];
|
|
temp2world = new int[nworlds];
|
|
if (me == 0) {
|
|
MPI_Allgather(&my_set_temp,1,MPI_INT,world2temp,1,MPI_INT,roots);
|
|
for (int i = 0; i < nworlds; i++) temp2world[world2temp[i]] = i;
|
|
}
|
|
MPI_Bcast(temp2world,nworlds,MPI_INT,0,world);
|
|
|
|
// if restarting tempering, reset temp target of Fix to current my_set_temp
|
|
|
|
if (narg == 8) {
|
|
double new_temp = set_temp[my_set_temp];
|
|
modify->fix[whichfix]->reset_target(new_temp);
|
|
}
|
|
|
|
// setup tempering runs
|
|
|
|
int i,which,partner,swap,partner_set_temp,partner_world;
|
|
double pe,pe_partner, delr,boltz_factor,new_temp, press_units;
|
|
|
|
if (me_universe == 0 && universe->uscreen)
|
|
fprintf(universe->uscreen,"Setting up tempering ...\n");
|
|
|
|
update->integrate->setup(1);
|
|
|
|
if (me_universe == 0) {
|
|
if (universe->uscreen) {
|
|
fprintf(universe->uscreen,"Step");
|
|
for (int i = 0; i < nworlds; i++)
|
|
fprintf(universe->uscreen," T%d",i);
|
|
fprintf(universe->uscreen,"\n");
|
|
}
|
|
if (universe->ulogfile) {
|
|
fprintf(universe->ulogfile,"Step");
|
|
for (int i = 0; i < nworlds; i++)
|
|
fprintf(universe->ulogfile," T%d",i);
|
|
fprintf(universe->ulogfile,"\n");
|
|
}
|
|
print_status();
|
|
}
|
|
|
|
timer->init();
|
|
timer->barrier_start();
|
|
|
|
for (int iswap = 0; iswap < nswaps; iswap++) {
|
|
|
|
// run for nevery timesteps
|
|
|
|
update->integrate->run(nevery);
|
|
|
|
// compute PE
|
|
// notify compute it will be called at next swap
|
|
|
|
pe = pe_compute->compute_scalar();
|
|
pe_compute->addstep(update->ntimestep + nevery);
|
|
double boxlox=domain->boxlo[0];
|
|
double boxhix=domain->boxhi[0];
|
|
double boxloy=domain->boxlo[1];
|
|
double boxhiy=domain->boxhi[1];
|
|
double boxloz=domain->boxlo[2];
|
|
double boxhiz=domain->boxhi[2];
|
|
double vol = (boxhix - boxlox)*(boxhiy - boxloy)*(boxhiz - boxloz);
|
|
double vol_partner = vol;
|
|
// which = which of 2 kinds of swaps to do (0,1)
|
|
|
|
if (!ranswap) which = iswap % 2;
|
|
else if (ranswap->uniform() < 0.5) which = 0;
|
|
else which = 1;
|
|
|
|
// partner_set_temp = which set temp I am partnering with for this swap
|
|
|
|
if (which == 0) {
|
|
if (my_set_temp % 2 == 0) partner_set_temp = my_set_temp + 1;
|
|
else partner_set_temp = my_set_temp - 1;
|
|
} else {
|
|
if (my_set_temp % 2 == 1) partner_set_temp = my_set_temp + 1;
|
|
else partner_set_temp = my_set_temp - 1;
|
|
}
|
|
|
|
// partner = proc ID to swap with
|
|
// if partner = -1, then I am not a proc that swaps
|
|
|
|
partner = -1;
|
|
if (me == 0 && partner_set_temp >= 0 && partner_set_temp < nworlds) {
|
|
partner_world = temp2world[partner_set_temp];
|
|
partner = world2root[partner_world];
|
|
}
|
|
|
|
// swap with a partner, only root procs in each world participate
|
|
// hi proc sends PE to low proc
|
|
// lo proc make Boltzmann decision on whether to swap
|
|
// lo proc communicates decision back to hi proc
|
|
|
|
swap = 0;
|
|
if (partner != -1) {
|
|
if (me_universe > partner) {
|
|
MPI_Send(&pe,1,MPI_DOUBLE,partner,0,universe->uworld);
|
|
}
|
|
else {
|
|
MPI_Recv(&pe_partner,1,MPI_DOUBLE,partner,0,universe->uworld,MPI_STATUS_IGNORE);
|
|
}
|
|
if (me_universe > partner) {
|
|
MPI_Send(&vol,1, MPI_DOUBLE,partner,0,universe->uworld);
|
|
}
|
|
else {
|
|
MPI_Recv(&vol_partner,1,MPI_DOUBLE,partner,0,universe->uworld,MPI_STATUS_IGNORE);
|
|
}
|
|
// Acceptance criteria changed for NPT ensemble
|
|
if (me_universe < partner) {
|
|
press_units = press_set/nktv2p;
|
|
delr = (pe_partner - pe)*(1.0/(boltz*set_temp[my_set_temp]) - 1.0/(boltz*set_temp[partner_set_temp])) + press_units*(1.0/(boltz*set_temp[my_set_temp]) - 1.0/(boltz*set_temp[partner_set_temp]))*(vol_partner - vol);
|
|
boltz_factor = -delr;
|
|
if (boltz_factor >= 0.0) swap = 1;
|
|
else if (ranboltz->uniform() < exp(boltz_factor)) swap = 1;
|
|
}
|
|
|
|
if (me_universe < partner)
|
|
MPI_Send(&swap,1,MPI_INT,partner,0,universe->uworld);
|
|
else
|
|
MPI_Recv(&swap,1,MPI_INT,partner,0,universe->uworld,MPI_STATUS_IGNORE);
|
|
#ifdef TEMPER_DEBUG
|
|
if (me_universe < partner)
|
|
fprintf(universe->uscreen,"SWAP %d & %d: yes = %d,Ts = %d %d, PEs = %g %g, Bz = %g %g, vol = %g %g\n",
|
|
me_universe,partner,swap,my_set_temp,partner_set_temp,
|
|
pe,pe_partner,boltz_factor,exp(boltz_factor), vol, vol_partner);
|
|
#endif
|
|
|
|
}
|
|
|
|
// bcast swap result to other procs in my world
|
|
|
|
MPI_Bcast(&swap,1,MPI_INT,0,world);
|
|
|
|
// rescale kinetic energy via velocities if move is accepted
|
|
|
|
if (swap) scale_velocities(partner_set_temp,my_set_temp);
|
|
|
|
// if my world swapped, all procs in world reset temp target of Fix
|
|
|
|
if (swap) {
|
|
new_temp = set_temp[partner_set_temp];
|
|
modify->fix[whichfix]->reset_target(new_temp);
|
|
}
|
|
|
|
// update my_set_temp and temp2world on every proc
|
|
// root procs update their value if swap took place
|
|
// allgather across root procs
|
|
// bcast within my world
|
|
|
|
if (swap) my_set_temp = partner_set_temp;
|
|
if (me == 0) {
|
|
MPI_Allgather(&my_set_temp,1,MPI_INT,world2temp,1,MPI_INT,roots);
|
|
for (i = 0; i < nworlds; i++) temp2world[world2temp[i]] = i;
|
|
}
|
|
MPI_Bcast(temp2world,nworlds,MPI_INT,0,world);
|
|
|
|
// print out current swap status
|
|
|
|
if (me_universe == 0) print_status();
|
|
}
|
|
|
|
timer->barrier_stop();
|
|
|
|
update->integrate->cleanup();
|
|
|
|
Finish finish(lmp);
|
|
finish.end(1);
|
|
|
|
update->whichflag = 0;
|
|
update->firststep = update->laststep = 0;
|
|
update->beginstep = update->endstep = 0;
|
|
}
|
|
|
|
/* ----------------------------------------------------------------------
|
|
scale kinetic energy via velocities a la Sugita
|
|
------------------------------------------------------------------------- */
|
|
|
|
void TemperNPT::scale_velocities(int t_partner, int t_me)
|
|
{
|
|
double sfactor = sqrt(set_temp[t_partner]/set_temp[t_me]);
|
|
|
|
double **v = atom->v;
|
|
int nlocal = atom->nlocal;
|
|
|
|
for (int i = 0; i < nlocal; i++) {
|
|
v[i][0] = v[i][0]*sfactor;
|
|
v[i][1] = v[i][1]*sfactor;
|
|
v[i][2] = v[i][2]*sfactor;
|
|
}
|
|
}
|
|
|
|
/* ----------------------------------------------------------------------
|
|
proc 0 prints current tempering status
|
|
------------------------------------------------------------------------- */
|
|
|
|
void TemperNPT::print_status()
|
|
{
|
|
if (universe->uscreen) {
|
|
fprintf(universe->uscreen,BIGINT_FORMAT,update->ntimestep);
|
|
for (int i = 0; i < nworlds; i++)
|
|
fprintf(universe->uscreen," %d",world2temp[i]);
|
|
fprintf(universe->uscreen,"\n");
|
|
}
|
|
if (universe->ulogfile) {
|
|
fprintf(universe->ulogfile,BIGINT_FORMAT,update->ntimestep);
|
|
for (int i = 0; i < nworlds; i++)
|
|
fprintf(universe->ulogfile," %d",world2temp[i]);
|
|
fprintf(universe->ulogfile,"\n");
|
|
fflush(universe->ulogfile);
|
|
}
|
|
}
|