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universe.cpp
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Fri, May 17, 10:57

universe.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 "mpi.h"
#include "stdlib.h"
#include "string.h"
#include "stdio.h"
#include "universe.h"
#include "memory.h"
using namespace LAMMPS_NS;
/* ----------------------------------------------------------------------
create & initialize the universe of processors in communicator
------------------------------------------------------------------------- */
Universe::Universe(LAMMPS *lmp, MPI_Comm communicator) : Pointers(lmp)
{
version = (char *) "22 Jan 2008";
uworld = communicator;
MPI_Comm_rank(uworld,&me);
MPI_Comm_size(uworld,&nprocs);
uscreen = stdout;
ulogfile = NULL;
nworlds = 0;
procs_per_world = NULL;
root_proc = NULL;
}
/* ---------------------------------------------------------------------- */
Universe::~Universe()
{
memory->sfree(procs_per_world);
memory->sfree(root_proc);
}
/* ----------------------------------------------------------------------
add 1 or more worlds to universe
str == NULL -> add 1 world with all procs in universe
str = NxM -> add N worlds, each with M procs
str = P -> add 1 world with P procs
------------------------------------------------------------------------- */
void Universe::add_world(char *str)
{
int n,nper;
char *ptr;
if (str == NULL) {
n = 1;
nper = nprocs;
} else if ((ptr = strchr(str,'x')) != NULL) {
*ptr = '\0';
n = atoi(str);
nper = atoi(ptr+1);
} else {
n = 1;
nper = atoi(str);
}
procs_per_world =
(int *) memory->srealloc(procs_per_world,(nworlds+n)*sizeof(int),
"universe:procs_per_world");
root_proc =
(int *) memory->srealloc(root_proc,(nworlds+n)*sizeof(int),
"universe:root_proc");
for (int i = 0; i < n; i++) {
procs_per_world[nworlds] = nper;
if (nworlds == 0) root_proc[nworlds] = 0;
else
root_proc[nworlds] = root_proc[nworlds-1] + procs_per_world[nworlds-1];
if (me >= root_proc[nworlds]) iworld = nworlds;
nworlds++;
}
}
/* ----------------------------------------------------------------------
check if total procs in all worlds = procs in universe
------------------------------------------------------------------------- */
int Universe::consistent()
{
int n = 0;
for (int i = 0; i < nworlds; i++) n += procs_per_world[i];
if (n == nprocs) return 1;
else return 0;
}

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