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imbalance_time.cpp
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Mon, Oct 7, 21:34

imbalance_time.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 "pointers.h"
#include "imbalance_time.h"
#include "atom.h"
#include "error.h"
#include "comm.h"
#include "force.h"
#include "timer.h"
using namespace LAMMPS_NS;
int ImbalanceTime::options(int narg, char **arg)
{
Error *error = _lmp->error;
Force *force = _lmp->force;
if (narg < 1) error->all(FLERR,"Illegal balance weight command");
_factor = force->numeric(FLERR,arg[0]);
if (_factor < 0.0 || _factor > 1.0)
error->all(FLERR,"Illegal balance weight command");
return 1;
}
/* -------------------------------------------------------------------- */
void ImbalanceTime::compute(double *weight)
{
const int nlocal = _lmp->atom->nlocal;
const int nprocs = _lmp->comm->nprocs;
MPI_Comm world = _lmp->world;
Timer *timer = _lmp->timer;
if (_factor > 0.0) {
// compute the cost function of based on relevant timers
if (timer->has_normal()) {
double cost = -_last;
cost += timer->get_wall(Timer::PAIR);
cost += timer->get_wall(Timer::NEIGH);
cost += timer->get_wall(Timer::BOND);
cost += timer->get_wall(Timer::KSPACE);
double allcost;
MPI_Allreduce(&cost,&allcost,1,MPI_DOUBLE,MPI_SUM,world);
if (allcost > 0.0) {
const double scale = (1.0-_factor) + _factor*cost*nprocs/allcost;
for (int i = 0; i < nlocal; ++i) weight[i] *= scale;
}
// record time up to this point
_last += cost;
}
}
}
/* -------------------------------------------------------------------- */
void ImbalanceTime::info(FILE *fp)
{
if (_factor > 0.0)
fprintf(fp," time weight factor: %g\n",_factor);
}

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