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lammps/src/read_restart.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 "lmptype.h"
#include "mpi.h"
#include "string.h"
#include "stdlib.h"
#include "sys/types.h"
#include "dirent.h"
#include "read_restart.h"
#include "atom.h"
#include "atom_vec.h"
#include "domain.h"
#include "comm.h"
#include "irregular.h"
#include "update.h"
#include "modify.h"
#include "fix.h"
#include "fix_read_restart.h"
#include "group.h"
#include "force.h"
#include "pair.h"
#include "bond.h"
#include "angle.h"
#include "dihedral.h"
#include "improper.h"
#include "special.h"
#include "universe.h"
#include "memory.h"
#include "error.h"
using namespace LAMMPS_NS;
// same as write_restart.cpp
enum{VERSION,SMALLINT,TAGINT,BIGINT,
UNITS,NTIMESTEP,DIMENSION,NPROCS,PROCGRID_0,PROCGRID_1,PROCGRID_2,
NEWTON_PAIR,NEWTON_BOND,XPERIODIC,YPERIODIC,ZPERIODIC,
BOUNDARY_00,BOUNDARY_01,BOUNDARY_10,BOUNDARY_11,BOUNDARY_20,BOUNDARY_21,
ATOM_STYLE,NATOMS,NTYPES,
NBONDS,NBONDTYPES,BOND_PER_ATOM,
NANGLES,NANGLETYPES,ANGLE_PER_ATOM,
NDIHEDRALS,NDIHEDRALTYPES,DIHEDRAL_PER_ATOM,
NIMPROPERS,NIMPROPERTYPES,IMPROPER_PER_ATOM,
BOXLO_0,BOXHI_0,BOXLO_1,BOXHI_1,BOXLO_2,BOXHI_2,
SPECIAL_LJ_1,SPECIAL_LJ_2,SPECIAL_LJ_3,
SPECIAL_COUL_1,SPECIAL_COUL_2,SPECIAL_COUL_3,
XY,XZ,YZ};
enum{MASS};
enum{PAIR,BOND,ANGLE,DIHEDRAL,IMPROPER};
#define LB_FACTOR 1.1
/* ---------------------------------------------------------------------- */
ReadRestart::ReadRestart(LAMMPS *lmp) : Pointers(lmp) {}
/* ---------------------------------------------------------------------- */
void ReadRestart::command(int narg, char **arg)
{
if (narg != 1) error->all("Illegal read_restart command");
if (domain->box_exist)
error->all("Cannot read_restart after simulation box is defined");
MPI_Comm_rank(world,&me);
MPI_Comm_size(world,&nprocs);
// if filename contains "*", search dir for latest restart file
char *file = new char[strlen(arg[0]) + 16];
if (strchr(arg[0],'*')) file_search(arg[0],file);
else strcpy(file,arg[0]);
// check if filename contains "%"
int multiproc;
if (strchr(file,'%')) multiproc = 1;
else multiproc = 0;
// open single restart file or base file for multiproc case
if (me == 0) {
if (screen) fprintf(screen,"Reading restart file ...\n");
char *hfile;
if (multiproc) {
hfile = new char[strlen(file) + 16];
char *ptr = strchr(file,'%');
*ptr = '\0';
sprintf(hfile,"%s%s%s",file,"base",ptr+1);
*ptr = '%';
} else hfile = file;
fp = fopen(hfile,"rb");
if (fp == NULL) {
char str[128];
sprintf(str,"Cannot open restart file %s",hfile);
error->one(str);
}
if (multiproc) delete [] hfile;
}
// read header info and create atom style and simulation box
header();
domain->box_exist = 1;
// problem setup using info from header
int n;
if (nprocs == 1) n = static_cast<int> (atom->natoms);
else n = static_cast<int> (LB_FACTOR * atom->natoms / nprocs);
atom->allocate_type_arrays();
atom->avec->grow(n);
n = atom->nmax;
domain->print_box(" ");
domain->set_initial_box();
domain->set_global_box();
comm->set_procs();
domain->set_local_box();
// read groups, ntype-length arrays, force field, fix info from file
// nextra = max # of extra quantities stored with each atom
group->read_restart(fp);
type_arrays();
force_fields();
int nextra = modify->read_restart(fp);
atom->nextra_store = nextra;
memory->create(atom->extra,n,nextra,"atom:extra");
// single file:
// nprocs_file = # of chunks in file
// proc 0 reads chunks one at a time and bcasts it to other procs
// each proc unpacks the atoms, saving ones in it's sub-domain
// check for atom in sub-domain differs for orthogonal vs triclinic box
// close restart file when done
AtomVec *avec = atom->avec;
int maxbuf = 0;
double *buf = NULL;
int m;
if (multiproc == 0) {
int triclinic = domain->triclinic;
double *x,lamda[3];
double *coord,*sublo,*subhi;
if (triclinic == 0) {
sublo = domain->sublo;
subhi = domain->subhi;
} else {
sublo = domain->sublo_lamda;
subhi = domain->subhi_lamda;
}
for (int iproc = 0; iproc < nprocs_file; iproc++) {
if (me == 0) fread(&n,sizeof(int),1,fp);
MPI_Bcast(&n,1,MPI_INT,0,world);
if (n > maxbuf) {
maxbuf = n;
memory->destroy(buf);
memory->create(buf,maxbuf,"read_restart:buf");
}
if (n > 0) {
if (me == 0) fread(buf,sizeof(double),n,fp);
MPI_Bcast(buf,n,MPI_DOUBLE,0,world);
}
m = 0;
while (m < n) {
x = &buf[m+1];
if (triclinic) {
domain->x2lamda(x,lamda);
coord = lamda;
} else coord = x;
if (coord[0] >= sublo[0] && coord[0] < subhi[0] &&
coord[1] >= sublo[1] && coord[1] < subhi[1] &&
coord[2] >= sublo[2] && coord[2] < subhi[2]) {
m += avec->unpack_restart(&buf[m]);
}
else m += static_cast<int> (buf[m]);
}
}
if (me == 0) fclose(fp);
// one file per proc:
// nprocs_file = # of files
// each proc reads 1/P fraction of files, keeping all atoms in the files
// perform irregular comm to migrate atoms to correct procs
// close restart file when done
} else {
if (me == 0) fclose(fp);
char *perproc = new char[strlen(file) + 16];
char *ptr = strchr(file,'%');
for (int iproc = me; iproc < nprocs_file; iproc += nprocs) {
*ptr = '\0';
sprintf(perproc,"%s%d%s",file,iproc,ptr+1);
*ptr = '%';
fp = fopen(perproc,"rb");
if (fp == NULL) {
char str[128];
sprintf(str,"Cannot open restart file %s",perproc);
error->one(str);
}
fread(&n,sizeof(int),1,fp);
if (n > maxbuf) {
maxbuf = n;
memory->destroy(buf);
memory->create(buf,maxbuf,"read_restart:buf");
}
if (n > 0) fread(buf,sizeof(double),n,fp);
m = 0;
while (m < n) m += avec->unpack_restart(&buf[m]);
fclose(fp);
}
delete [] perproc;
// create a temporary fix to hold and migrate extra atom info
// necessary b/c irregular will migrate atoms
if (nextra) {
char cextra[8],fixextra[8];
sprintf(cextra,"%d",nextra);
sprintf(fixextra,"%d",modify->nfix_restart_peratom);
char **newarg = new char*[5];
newarg[0] = (char *) "_read_restart";
newarg[1] = (char *) "all";
newarg[2] = (char *) "READ_RESTART";
newarg[3] = cextra;
newarg[4] = fixextra;
modify->add_fix(5,newarg);
delete [] newarg;
}
// move atoms to new processors via irregular()
// in case read by different proc than wrote restart file
// first do map_init() since irregular->migrate_atoms() will do map_clear()
if (atom->map_style) atom->map_init();
if (domain->triclinic) domain->x2lamda(atom->nlocal);
Irregular *irregular = new Irregular(lmp);
irregular->migrate_atoms();
delete irregular;
if (domain->triclinic) domain->lamda2x(atom->nlocal);
// put extra atom info held by fix back into atom->extra
// destroy temporary fix
if (nextra) {
memory->destroy(atom->extra);
memory->create(atom->extra,atom->nmax,nextra,"atom:extra");
int ifix = modify->find_fix("_read_restart");
FixReadRestart *fix = (FixReadRestart *) modify->fix[ifix];
int *count = fix->count;
double **extra = fix->extra;
double **atom_extra = atom->extra;
int nlocal = atom->nlocal;
for (int i = 0; i < nlocal; i++)
for (int j = 0; j < count[i]; j++)
atom_extra[i][j] = extra[i][j];
modify->delete_fix("_read_restart");
}
}
// clean-up memory
delete [] file;
memory->destroy(buf);
// check that all atoms were assigned to procs
bigint natoms;
bigint nblocal = atom->nlocal;
MPI_Allreduce(&nblocal,&natoms,1,MPI_LMP_BIGINT,MPI_SUM,world);
if (me == 0) {
if (screen) fprintf(screen," " BIGINT_FORMAT " atoms\n",natoms);
if (logfile) fprintf(logfile," " BIGINT_FORMAT " atoms\n",natoms);
}
if (natoms != atom->natoms) error->all("Did not assign all atoms correctly");
if (me == 0) {
if (atom->nbonds) {
if (screen) fprintf(screen," " BIGINT_FORMAT " bonds\n",atom->nbonds);
if (logfile) fprintf(logfile," " BIGINT_FORMAT " bonds\n",atom->nbonds);
}
if (atom->nangles) {
if (screen) fprintf(screen," " BIGINT_FORMAT " angles\n",
atom->nangles);
if (logfile) fprintf(logfile," " BIGINT_FORMAT " angles\n",
atom->nangles);
}
if (atom->ndihedrals) {
if (screen) fprintf(screen," " BIGINT_FORMAT " dihedrals\n",
atom->ndihedrals);
if (logfile) fprintf(logfile," " BIGINT_FORMAT " dihedrals\n",
atom->ndihedrals);
}
if (atom->nimpropers) {
if (screen) fprintf(screen," " BIGINT_FORMAT " impropers\n",
atom->nimpropers);
if (logfile) fprintf(logfile," " BIGINT_FORMAT " impropers\n",
atom->nimpropers);
}
}
// check if tags are being used
// create global mapping and bond topology now that system is defined
int flag = 0;
for (int i = 0; i < atom->nlocal; i++)
if (atom->tag[i] > 0) flag = 1;
int flag_all;
MPI_Allreduce(&flag,&flag_all,1,MPI_INT,MPI_MAX,world);
if (flag_all == 0) atom->tag_enable = 0;
if (atom->map_style) {
atom->map_init();
atom->map_set();
}
if (atom->molecular) {
Special special(lmp);
special.build();
}
}
/* ----------------------------------------------------------------------
search for all files matching infile which contains a "*"
replace "*" with latest timestep value to create outfile name
search dir referenced by initial pathname of file
if infile also contains "%", need to use "base" when search directory
------------------------------------------------------------------------- */
void ReadRestart::file_search(char *infile, char *outfile)
{
char *ptr;
// separate infile into dir + filename
char *dirname = new char[strlen(infile) + 1];
char *filename = new char[strlen(infile) + 1];
if (strchr(infile,'/')) {
ptr = strrchr(infile,'/');
*ptr = '\0';
strcpy(dirname,infile);
strcpy(filename,ptr+1);
*ptr = '/';
} else {
strcpy(dirname,"./");
strcpy(filename,infile);
}
// if filename contains "%" replace "%" with "base"
char *pattern = new char[strlen(filename) + 16];
if (ptr = strchr(filename,'%')) {
*ptr = '\0';
sprintf(pattern,"%s%s%s",filename,"base",ptr+1);
*ptr = '%';
} else strcpy(pattern,filename);
// scan all files in directory, searching for files that match pattern
// maxnum = largest int that matches "*"
int n = strlen(pattern) + 16;
char *begin = new char[n];
char *middle = new char[n];
char *end = new char[n];
ptr = strchr(pattern,'*');
*ptr = '\0';
strcpy(begin,pattern);
strcpy(end,ptr+1);
int nbegin = strlen(begin);
int maxnum = -1;
if (me == 0) {
struct dirent *ep;
DIR *dp = opendir(dirname);
if (dp == NULL)
error->one("Cannot open dir to search for restart file");
while (ep = readdir(dp)) {
if (strstr(ep->d_name,begin) != ep->d_name) continue;
if ((ptr = strstr(&ep->d_name[nbegin],end)) == NULL) continue;
if (strlen(end) == 0) ptr = ep->d_name + strlen(ep->d_name);
*ptr = '\0';
if (strlen(&ep->d_name[nbegin]) < n) {
strcpy(middle,&ep->d_name[nbegin]);
if (atoi(middle) > maxnum) maxnum = atoi(middle);
}
}
closedir(dp);
if (maxnum < 0) error->one("Found no restart file matching pattern");
}
// create outfile with maxint substituted for "*"
// use original infile, not pattern, since need to retain "%" in filename
ptr = strchr(infile,'*');
*ptr = '\0';
sprintf(outfile,"%s%d%s",infile,maxnum,ptr+1);
*ptr = '*';
// clean up
delete [] dirname;
delete [] filename;
delete [] pattern;
delete [] begin;
delete [] middle;
delete [] end;
}
/* ----------------------------------------------------------------------
read header of restart file
------------------------------------------------------------------------- */
void ReadRestart::header()
{
int px,py,pz;
int xperiodic,yperiodic,zperiodic;
int boundary[3][2];
// read flags and values until flag = -1
int flag = read_int();
while (flag >= 0) {
// check restart file version, warn if different
if (flag == VERSION) {
char *version = read_char();
if (strcmp(version,universe->version) != 0 && me == 0) {
error->warning("Restart file version does not match LAMMPS version");
if (screen) fprintf(screen," restart file = %s, LAMMPS = %s\n",
version,universe->version);
}
delete [] version;
// check lmptype.h sizes, error if different
} else if (flag == SMALLINT) {
int size = read_int();
if (size != sizeof(smallint))
error->all("Smallint setting in lmptype.h is not compatible");
} else if (flag == TAGINT) {
int size = read_int();
if (size != sizeof(tagint))
error->all("Tagint setting in lmptype.h is not compatible");
} else if (flag == BIGINT) {
int size = read_int();
if (size != sizeof(bigint))
error->all("Bigint setting in lmptype.h is not compatible");
// reset unit_style only if different
// so that timestep,neighbor-skin are not changed
} else if (flag == UNITS) {
char *style = read_char();
if (strcmp(style,update->unit_style) != 0) update->set_units(style);
delete [] style;
} else if (flag == NTIMESTEP) {
update->ntimestep = read_bigint();
// set dimension from restart file
} else if (flag == DIMENSION) {
int dimension = read_int();
domain->dimension = dimension;
if (domain->dimension == 2 && domain->zperiodic == 0)
error->all("Cannot run 2d simulation with nonperiodic Z dimension");
// read nprocs from restart file, warn if different
} else if (flag == NPROCS) {
nprocs_file = read_int();
if (nprocs_file != comm->nprocs && me == 0)
error->warning("Restart file used different # of processors");
// don't set procgrid, warn if different
} else if (flag == PROCGRID_0) {
px = read_int();
} else if (flag == PROCGRID_1) {
py = read_int();
} else if (flag == PROCGRID_2) {
pz = read_int();
if (comm->user_procgrid[0] != 0 &&
(px != comm->user_procgrid[0] || py != comm->user_procgrid[1] ||
pz != comm->user_procgrid[2]) && me == 0)
error->warning("Restart file used different 3d processor grid");
// don't set newton_pair, leave input script value unchanged
// set newton_bond from restart file
// warn if different and input script settings are not default
} else if (flag == NEWTON_PAIR) {
int newton_pair_file = read_int();
if (force->newton_pair != 1) {
if (newton_pair_file != force->newton_pair && me == 0)
error->warning("Restart file used different newton pair setting, "
"using input script value");
}
} else if (flag == NEWTON_BOND) {
int newton_bond_file = read_int();
if (force->newton_bond != 1) {
if (newton_bond_file != force->newton_bond && me == 0)
error->warning("Restart file used different newton bond setting, "
"using restart file value");
}
force->newton_bond = newton_bond_file;
if (force->newton_pair || force->newton_bond) force->newton = 1;
else force->newton = 0;
// set boundary settings from restart file
// warn if different and input script settings are not default
} else if (flag == XPERIODIC) {
xperiodic = read_int();
} else if (flag == YPERIODIC) {
yperiodic = read_int();
} else if (flag == ZPERIODIC) {
zperiodic = read_int();
} else if (flag == BOUNDARY_00) {
boundary[0][0] = read_int();
} else if (flag == BOUNDARY_01) {
boundary[0][1] = read_int();
} else if (flag == BOUNDARY_10) {
boundary[1][0] = read_int();
} else if (flag == BOUNDARY_11) {
boundary[1][1] = read_int();
} else if (flag == BOUNDARY_20) {
boundary[2][0] = read_int();
} else if (flag == BOUNDARY_21) {
boundary[2][1] = read_int();
if (domain->boundary[0][0] || domain->boundary[0][1] ||
domain->boundary[1][0] || domain->boundary[1][1] ||
domain->boundary[2][0] || domain->boundary[2][1]) {
if (boundary[0][0] != domain->boundary[0][0] ||
boundary[0][1] != domain->boundary[0][1] ||
boundary[1][0] != domain->boundary[1][0] ||
boundary[1][1] != domain->boundary[1][1] ||
boundary[2][0] != domain->boundary[2][0] ||
boundary[2][1] != domain->boundary[2][1]) {
if (me == 0)
error->warning("Restart file used different boundary settings, "
"using restart file values");
}
}
domain->boundary[0][0] = boundary[0][0];
domain->boundary[0][1] = boundary[0][1];
domain->boundary[1][0] = boundary[1][0];
domain->boundary[1][1] = boundary[1][1];
domain->boundary[2][0] = boundary[2][0];
domain->boundary[2][1] = boundary[2][1];
domain->periodicity[0] = domain->xperiodic = xperiodic;
domain->periodicity[1] = domain->yperiodic = yperiodic;
domain->periodicity[2] = domain->zperiodic = zperiodic;
domain->nonperiodic = 0;
if (xperiodic == 0 || yperiodic == 0 || zperiodic == 0) {
domain->nonperiodic = 1;
if (boundary[0][0] >= 2 || boundary[0][1] >= 2 ||
boundary[1][0] >= 2 || boundary[1][1] >= 2 ||
boundary[2][0] >= 2 || boundary[2][1] >= 2)
domain->nonperiodic = 2;
}
// create new AtomVec class
// if style = hybrid, read additional sub-class arguments
} else if (flag == ATOM_STYLE) {
char *style = read_char();
int nwords = 0;
char **words = NULL;
if (strcmp(style,"hybrid") == 0) {
nwords = read_int();
words = new char*[nwords];
for (int i = 0; i < nwords; i++) words[i] = read_char();
}
atom->create_avec(style,nwords,words);
for (int i = 0; i < nwords; i++) delete [] words[i];
delete [] words;
delete [] style;
} else if (flag == NATOMS) {
atom->natoms = read_bigint();
} else if (flag == NTYPES) {
atom->ntypes = read_int();
} else if (flag == NBONDS) {
atom->nbonds = read_bigint();
} else if (flag == NBONDTYPES) {
atom->nbondtypes = read_int();
} else if (flag == BOND_PER_ATOM) {
atom->bond_per_atom = read_int();
} else if (flag == NANGLES) {
atom->nangles = read_bigint();
} else if (flag == NANGLETYPES) {
atom->nangletypes = read_int();
} else if (flag == ANGLE_PER_ATOM) {
atom->angle_per_atom = read_int();
} else if (flag == NDIHEDRALS) {
atom->ndihedrals = read_bigint();
} else if (flag == NDIHEDRALTYPES) {
atom->ndihedraltypes = read_int();
} else if (flag == DIHEDRAL_PER_ATOM) {
atom->dihedral_per_atom = read_int();
} else if (flag == NIMPROPERS) {
atom->nimpropers = read_bigint();
} else if (flag == NIMPROPERTYPES) {
atom->nimpropertypes = read_int();
} else if (flag == IMPROPER_PER_ATOM) {
atom->improper_per_atom = read_int();
} else if (flag == BOXLO_0) {
domain->boxlo[0] = read_double();
} else if (flag == BOXHI_0) {
domain->boxhi[0] = read_double();
} else if (flag == BOXLO_1) {
domain->boxlo[1] = read_double();
} else if (flag == BOXHI_1) {
domain->boxhi[1] = read_double();
} else if (flag == BOXLO_2) {
domain->boxlo[2] = read_double();
} else if (flag == BOXHI_2) {
domain->boxhi[2] = read_double();
} else if (flag == SPECIAL_LJ_1) {
force->special_lj[1] = read_double();
} else if (flag == SPECIAL_LJ_2) {
force->special_lj[2] = read_double();
} else if (flag == SPECIAL_LJ_3) {
force->special_lj[3] = read_double();
} else if (flag == SPECIAL_COUL_1) {
force->special_coul[1] = read_double();
} else if (flag == SPECIAL_COUL_2) {
force->special_coul[2] = read_double();
} else if (flag == SPECIAL_COUL_3) {
force->special_coul[3] = read_double();
} else if (flag == XY) {
domain->triclinic = 1;
domain->xy = read_double();
} else if (flag == XZ) {
domain->triclinic = 1;
domain->xz = read_double();
} else if (flag == YZ) {
domain->triclinic = 1;
domain->yz = read_double();
} else error->all("Invalid flag in header section of restart file");
flag = read_int();
}
}
/* ---------------------------------------------------------------------- */
void ReadRestart::type_arrays()
{
int flag = read_int();
while (flag >= 0) {
if (flag == MASS) {
double *mass = new double[atom->ntypes+1];
if (me == 0) fread(&mass[1],sizeof(double),atom->ntypes,fp);
MPI_Bcast(&mass[1],atom->ntypes,MPI_DOUBLE,0,world);
atom->set_mass(mass);
delete [] mass;
} else error->all("Invalid flag in type arrays section of restart file");
flag = read_int();
}
}
/* ---------------------------------------------------------------------- */
void ReadRestart::force_fields()
{
int n;
char *style;
int flag = read_int();
while (flag >= 0) {
if (flag == PAIR) {
if (me == 0) fread(&n,sizeof(int),1,fp);
MPI_Bcast(&n,1,MPI_INT,0,world);
style = new char[n];
if (me == 0) fread(style,sizeof(char),n,fp);
MPI_Bcast(style,n,MPI_CHAR,0,world);
force->create_pair(style);
delete [] style;
force->pair->read_restart(fp);
} else if (flag == BOND) {
if (me == 0) fread(&n,sizeof(int),1,fp);
MPI_Bcast(&n,1,MPI_INT,0,world);
style = new char[n];
if (me == 0) fread(style,sizeof(char),n,fp);
MPI_Bcast(style,n,MPI_CHAR,0,world);
force->create_bond(style);
delete [] style;
force->bond->read_restart(fp);
} else if (flag == ANGLE) {
if (me == 0) fread(&n,sizeof(int),1,fp);
MPI_Bcast(&n,1,MPI_INT,0,world);
style = new char[n];
if (me == 0) fread(style,sizeof(char),n,fp);
MPI_Bcast(style,n,MPI_CHAR,0,world);
force->create_angle(style);
delete [] style;
force->angle->read_restart(fp);
} else if (flag == DIHEDRAL) {
if (me == 0) fread(&n,sizeof(int),1,fp);
MPI_Bcast(&n,1,MPI_INT,0,world);
style = new char[n];
if (me == 0) fread(style,sizeof(char),n,fp);
MPI_Bcast(style,n,MPI_CHAR,0,world);
force->create_dihedral(style);
delete [] style;
force->dihedral->read_restart(fp);
} else if (flag == IMPROPER) {
if (me == 0) fread(&n,sizeof(int),1,fp);
MPI_Bcast(&n,1,MPI_INT,0,world);
style = new char[n];
if (me == 0) fread(style,sizeof(char),n,fp);
MPI_Bcast(style,n,MPI_CHAR,0,world);
force->create_improper(style);
delete [] style;
force->improper->read_restart(fp);
} else error->all("Invalid flag in force field section of restart file");
flag = read_int();
}
}
/* ----------------------------------------------------------------------
read an int from restart file and bcast it
------------------------------------------------------------------------- */
int ReadRestart::read_int()
{
int value;
if (me == 0) fread(&value,sizeof(int),1,fp);
MPI_Bcast(&value,1,MPI_INT,0,world);
return value;
}
/* ----------------------------------------------------------------------
read a double from restart file and bcast it
------------------------------------------------------------------------- */
double ReadRestart::read_double()
{
double value;
if (me == 0) fread(&value,sizeof(double),1,fp);
MPI_Bcast(&value,1,MPI_DOUBLE,0,world);
return value;
}
/* ----------------------------------------------------------------------
read a char str from restart file and bcast it
str is allocated here, ptr is returned, caller must deallocate
------------------------------------------------------------------------- */
char *ReadRestart::read_char()
{
int n;
if (me == 0) fread(&n,sizeof(int),1,fp);
MPI_Bcast(&n,1,MPI_INT,0,world);
char *value = new char[n];
if (me == 0) fread(value,sizeof(char),n,fp);
MPI_Bcast(value,n,MPI_CHAR,0,world);
return value;
}
/* ----------------------------------------------------------------------
read a bigint from restart file and bcast it
------------------------------------------------------------------------- */
bigint ReadRestart::read_bigint()
{
bigint value;
if (me == 0) fread(&value,sizeof(bigint),1,fp);
MPI_Bcast(&value,1,MPI_LMP_BIGINT,0,world);
return value;
}
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