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restart.c
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restart.c
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#include <mpi.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/file.h>
#include <unistd.h>
#include <gsl/gsl_rng.h>
#include "allvars.h"
#include "proto.h"
#include "domain.h"
static FILE *fd;
#ifdef CHIMES
static ChimesFloat *gasAbundancesBuf;
#endif
static void in(int *x, int modus);
static void byten(void *x, size_t n, int modus);
int old_MaxPart = 0, new_MaxPart;
/* This function reads or writes the restart files.
* Each processor writes its own restart file, with the
* I/O being done in parallel. To avoid congestion of the disks
* you can tell the program to restrict the number of files
* that are simultaneously written to NumFilesWrittenInParallel.
*
* If modus>0 the restart()-routine reads,
* if modus==0 it writes a restart file.
*/
/*
* This file was originally part of the GADGET3 code developed by
* Volker Springel. The code has been modified
* in part (adding/removing read/write items, allowing for different variables
* to be changed or re-initialized on restarts, and changing variable units as necessary)
* by Phil Hopkins (phopkins@caltech.edu) for GIZMO.
*/
void restart(int modus)
{
char buf[200], buf_bak[200], buf_mv[500];
double save_PartAllocFactor;
int nprocgroup, primaryTask, groupTask;
struct global_data_all_processes all_task0;
int nmulti = MULTIPLEDOMAINS, regular_restarts_are_valid = 1, backup_restarts_are_valid = 1;
#ifdef CHIMES
int partIndex, abunIndex;
#endif
if(ThisTask == 0 && modus == 0) // writing re-start files: move old files to .bak
{
sprintf(buf, "%s/restartfiles", All.OutputDir);
mkdir(buf, 02755);
#ifndef NOCALLSOFSYSTEM
int i_Task_iter;
for(i_Task_iter=0; i_Task_iter<NTask; i_Task_iter++)
{
sprintf(buf, "%s/restartfiles/%s.%d", All.OutputDir, All.RestartFile, i_Task_iter);
sprintf(buf_bak, "%s/restartfiles/%s.%d.bak", All.OutputDir, All.RestartFile, i_Task_iter);
#ifdef IO_REDUNDANT_BACKUP_RESTARTFILE_FREQUENCY
if( (((int)(CPUThisRun/All.CpuTimeBetRestartFile)) % ((int)IO_REDUNDANT_BACKUP_RESTARTFILE_FREQUENCY)) == 0)
{
char buf_bak2[200]; sprintf(buf_bak2, "%s/restartfiles/%s.%d.bak2", All.OutputDir, All.RestartFile, i_Task_iter);
rename(buf_bak,buf_bak2); // move old backup restart files to .bak2 files //
}
#endif
rename(buf,buf_bak); // move old restart files to .bak files //
}
#endif
}
if(modus == 1) // reading re-start files. make sure to check all the files to read exist!
{
#ifndef NOCALLSOFSYSTEM
int i_Task_iter;
for(i_Task_iter=0; i_Task_iter<NTask; i_Task_iter++)
{
sprintf(buf, "%s/restartfiles/%s.%d", All.OutputDir, All.RestartFile, i_Task_iter);
sprintf(buf_bak, "%s/restartfiles/%s.%d.bak", All.OutputDir, All.RestartFile, i_Task_iter);
if(!(fd = fopen(buf, "r"))) {regular_restarts_are_valid=0;} else {fclose(fd);} // check if regular restart exists
if(!(fd = fopen(buf_bak, "r"))) {backup_restarts_are_valid=0;} else {fclose(fd);} // check if backup restart exists
}
#endif
if(ThisTask == 0)
{
if((regular_restarts_are_valid == 0) && (backup_restarts_are_valid == 0))
{
printf("Fatal error. Full set of restart files ('%s' or '%s') not found - check the restarts are uncorrupted and your MPI process number has not changed.\n", buf, buf_bak);
endrun(7871);
}
if((regular_restarts_are_valid == 0) && (backup_restarts_are_valid == 1))
{
printf("Default restartfiles ('%s') not found - they are incomplete or corrupted [number of files matching MPI process number not found. But apparently valid set of backup restartfiles ('%s') found. Attempting to use those.\n", buf, buf_bak);
}
}
}
MPI_Barrier(MPI_COMM_WORLD);
sprintf(buf, "%s/restartfiles/%s.%d", All.OutputDir, All.RestartFile, ThisTask);
if((modus == 1) && (regular_restarts_are_valid == 0) && (backup_restarts_are_valid == 1)) {sprintf(buf, "%s/restartfiles/%s.%d.bak", All.OutputDir, All.RestartFile, ThisTask);}
sprintf(buf_bak, "%s/restartfiles/%s.%d.bak", All.OutputDir, All.RestartFile, ThisTask);
sprintf(buf_mv, "mv %s %s", buf, buf_bak);
if((NTask < All.NumFilesWrittenInParallel))
{
printf("Fatal error.\nNumber of processors must be greater than or equal to `NumFilesWrittenInParallel'.\n");
endrun(2131);
}
nprocgroup = NTask / All.NumFilesWrittenInParallel;
if((NTask % All.NumFilesWrittenInParallel))
{
nprocgroup++;
}
primaryTask = (ThisTask / nprocgroup) * nprocgroup;
for(groupTask = 0; groupTask < nprocgroup; groupTask++)
{
if(ThisTask == (primaryTask + groupTask)) /* ok, it's this processor's turn */
{
if(modus)
{
if(!(fd = fopen(buf, "r")))
{
if(!(fd = fopen(buf_bak, "r")))
{
printf("Restart file '%s' nor '%s' found.\n", buf, buf_bak);
endrun(7870);
}
}
}
else
{
if(!(fd = fopen(buf, "w")))
{
printf("Restart file '%s' cannot be opened.\n", buf);
endrun(7878);
}
}
save_PartAllocFactor = All.PartAllocFactor;
/* common data */
byten(&All, sizeof(struct global_data_all_processes), modus);
if(ThisTask == 0 && modus > 0)
all_task0 = All;
if(modus > 0 && groupTask == 0) /* read */
{
MPI_Bcast(&all_task0, sizeof(struct global_data_all_processes), MPI_BYTE, 0, MPI_COMM_WORLD);
}
if(modus) /* read */
{
if(All.PartAllocFactor != save_PartAllocFactor)
{
old_MaxPart = All.MaxPart; /* old MaxPart */
if(ThisTask == 0)
printf("PartAllocFactor changed: %f/%f , adapting bounds ...\n",
All.PartAllocFactor, save_PartAllocFactor);
All.PartAllocFactor = save_PartAllocFactor;
All.MaxPart = (int) (All.PartAllocFactor * (All.TotNumPart / NTask));
All.MaxPartGas = (int) (All.PartAllocFactor * (All.TotN_gas / NTask));
#ifdef ALLOW_IMBALANCED_GASPARTICLELOAD
All.MaxPartGas = All.MaxPart; // PFH: increasing All.MaxPartGas according to this line can allow better load-balancing in some cases. however it leads to more memory problems
#endif
new_MaxPart = All.MaxPart;
save_PartAllocFactor = -1;
}
if(all_task0.Time != All.Time)
{
printf("The restart file on task=%d is not consistent with the one on task=0\n", ThisTask);
fflush(stdout);
endrun(16);
}
allocate_memory();
}
in(&NumPart, modus);
if(NumPart > All.MaxPart)
{
printf("it seems you have reduced(!) 'PartAllocFactor' below the value of %g needed to load the restart file.\n", NumPart / (((double) All.TotNumPart) / NTask));
printf("fatal error\n");
endrun(22);
}
if(modus) /* read */
{
if(old_MaxPart) {All.MaxPart = old_MaxPart;} /* such that tree is still valid */
}
/* Particle data */
byten(&P[0], NumPart * sizeof(struct particle_data), modus);
in(&N_gas, modus);
if(N_gas > 0)
{
if(N_gas > All.MaxPartGas)
{
printf("GAS: it seems you have reduced(!) 'PartAllocFactor' below the value of %g needed to load the restart file.\n", N_gas / (((double) All.TotN_gas) / NTask));
printf("fatal error\n");
endrun(222);
}
/* fluid-cell data */
byten(&SphP[0], N_gas * sizeof(struct gas_cell_data), modus);
#ifdef CHIMES
gasAbundancesBuf = (ChimesFloat *) malloc(N_gas * ChimesGlobalVars.totalNumberOfSpecies * sizeof(ChimesFloat));
if (!modus) /* write */
{
/* Read abundance arrays into buffer */
for (partIndex = 0; partIndex < N_gas; partIndex++)
{
for (abunIndex = 0; abunIndex < ChimesGlobalVars.totalNumberOfSpecies; abunIndex++)
{gasAbundancesBuf[(partIndex * ChimesGlobalVars.totalNumberOfSpecies) + abunIndex] = ChimesGasVars[partIndex].abundances[abunIndex];}
}
}
/* Abundance buffer */
byten(&gasAbundancesBuf[0], N_gas * ChimesGlobalVars.totalNumberOfSpecies * sizeof(ChimesFloat), modus);
/* GasVars */
byten(&ChimesGasVars[0], N_gas * sizeof(struct gasVariables), modus);
if (modus) /* read */
{
for (partIndex = 0; partIndex < N_gas; partIndex++)
{
/* Allocate memory for abundance arrays */
allocate_gas_abundances_memory(&(ChimesGasVars[partIndex]), &ChimesGlobalVars);
/* Read abundances from buffer */
for (abunIndex = 0; abunIndex < ChimesGlobalVars.totalNumberOfSpecies; abunIndex++)
{ChimesGasVars[partIndex].abundances[abunIndex] = gasAbundancesBuf[(partIndex * ChimesGlobalVars.totalNumberOfSpecies) + abunIndex];}
#ifdef CHIMES_TURB_DIFF_IONS
chimes_update_turbulent_abundances(partIndex, 1);
#endif
}
}
free(gasAbundancesBuf);
#endif
}
/* write state of random number generator */
byten(gsl_rng_state(random_generator), gsl_rng_size(random_generator), modus);
byten(&SelRnd, sizeof(SelRnd), modus);
#ifdef TURB_DRIVING
byten(gsl_rng_state(StRng), gsl_rng_size(StRng), modus);
byten(&StNModes, sizeof(StNModes), modus);
byten(StOUPhases, StNModes*6*sizeof(double),modus);
byten(StAmpl, StNModes*3*sizeof(double),modus);
byten(StAka, StNModes*3*sizeof(double),modus);
byten(StAkb, StNModes*3*sizeof(double),modus);
byten(StMode, StNModes*3*sizeof(double),modus);
byten(&StTPrev, sizeof(StTPrev),modus);
#endif
/* write flags for active timebins */
byten(TimeBinActive, TIMEBINS * sizeof(int), modus);
/* now store relevant data for tree */
in(&Gas_split, modus);
#ifdef GALSF
in(&Stars_converted, modus);
#endif
/* now store relevant data for tree */
in(&nmulti, modus);
in(&NTopleaves, modus);
in(&NTopnodes, modus);
if(modus != 0 && nmulti != MULTIPLEDOMAINS)
{
if(ThisTask == 0)
printf
("Looks like you changed MULTIPLEDOMAINS from %d to %d.\nWe will need to discard tree stored in restart files and construct a new one.\n",
nmulti, (int) MULTIPLEDOMAINS);
/* In this case we must do a new domain decomposition! */
}
else
{
if(modus) /* read */
{
domain_allocate();
force_treeallocate((int) (All.TreeAllocFactor * All.MaxPart) + NTopnodes, All.MaxPart);
}
in(&Numnodestree, modus);
if(Numnodestree > MaxNodes)
{
printf
("Tree storage: it seems you have reduced(!) 'PartAllocFactor' below the value needed to load the restart file (task=%d). "
"Numnodestree=%d MaxNodes=%d\n", ThisTask, Numnodestree, MaxNodes);
endrun(221);
}
byten(Nodes_base, Numnodestree * sizeof(struct NODE), modus);
byten(Extnodes_base, Numnodestree * sizeof(struct extNODE), modus);
byten(Father, NumPart * sizeof(int), modus);
byten(Nextnode, NumPart * sizeof(int), modus);
byten(Nextnode + All.MaxPart, NTopnodes * sizeof(int), modus);
byten(DomainStartList, NTask * MULTIPLEDOMAINS * sizeof(int), modus);
byten(DomainEndList, NTask * MULTIPLEDOMAINS * sizeof(int), modus);
byten(TopNodes, NTopnodes * sizeof(struct topnode_data), modus);
byten(DomainTask, NTopnodes * sizeof(int), modus);
byten(DomainNodeIndex, NTopleaves * sizeof(int), modus);
byten(DomainCorner, 3 * sizeof(double), modus);
byten(DomainCenter, 3 * sizeof(double), modus);
byten(&DomainLen, sizeof(double), modus);
byten(&DomainFac, sizeof(double), modus);
}
fclose(fd);
}
else /* wait inside the group */
{
if(modus > 0 && groupTask == 0) /* read */
{
MPI_Bcast(&all_task0, sizeof(struct global_data_all_processes), MPI_BYTE, 0, MPI_COMM_WORLD);
}
}
MPI_Barrier(MPI_COMM_WORLD);
}
if(modus != 0 && nmulti != MULTIPLEDOMAINS) /* in this case we must force a domain decomposition */
{
if(ThisTask == 0) {printf("Doing extra domain decomposition because you changed MULTIPLEDOMAINS\n"); fflush(stdout);}
domain_Decomposition(0, 0, 0);
}
}
/* reads/writes n bytes
*/
void byten(void *x, size_t n, int modus)
{
if(modus)
my_fread(x, n, 1, fd);
else
my_fwrite(x, n, 1, fd);
}
/* reads/writes one int
*/
void in(int *x, int modus)
{
if(modus)
my_fread(x, 1, sizeof(int), fd);
else
my_fwrite(x, 1, sizeof(int), fd);
}