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Sun, Jun 2, 07:44

read_ic.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <string.h>
#include <mpi.h>
#include "allvars.h"
#include "proto.h"
/*! \file read_ic.c
* \brief Read initial conditions in one of Gadget's file formats
*/
/*! This function reads initial conditions, in one of the three possible file
* formats currently supported by Gadget. Note: When a snapshot file is
* started from initial conditions (start-option 0), not all the information
* in the header is used, in particular, the STARTING TIME needs to be set in
* the parameterfile. Also, for gas particles, only the internal energy is
* read, the density and mean molecular weight will be recomputed by the
* code. When InitGasTemp>0 is given, the gas temperature will be initialzed
* to this value assuming a mean colecular weight either corresponding to
* complete neutrality, or full ionization.
*
* However, when the code is started with start-option 2, then all the this
* data in the snapshot files is preserved, i.e. this is also the way to
* resume a simulation from a snapshot file in case a regular restart file is
* not available.
*/
void read_ic(char *fname)
{
int i, num_files, rest_files, ngroups, gr, filenr, masterTask, lastTask, groupMaster;
double u_init;
char buf[500];
#ifndef ISOTHERM_EQS
double molecular_weight;
#endif
NumPart = 0;
N_gas = 0;
#ifdef SFR
N_stars = 0;
#endif
All.TotNumPart = 0;
num_files = find_files(fname);
rest_files = num_files;
fill_Tab_IO_Labels();
while(rest_files > NTask)
{
sprintf(buf, "%s.%d", fname, ThisTask + (rest_files - NTask));
if(All.ICFormat == 3)
sprintf(buf, "%s.%d.hdf5", fname, ThisTask + (rest_files - NTask));
ngroups = NTask / All.NumFilesWrittenInParallel;
if((NTask % All.NumFilesWrittenInParallel))
ngroups++;
groupMaster = (ThisTask / ngroups) * ngroups;
for(gr = 0; gr < ngroups; gr++)
{
if(ThisTask == (groupMaster + gr)) /* ok, it's this processor's turn */
read_file(buf, ThisTask, ThisTask);
MPI_Barrier(MPI_COMM_WORLD);
}
rest_files -= NTask;
}
if(rest_files > 0)
{
distribute_file(rest_files, 0, 0, NTask - 1, &filenr, &masterTask, &lastTask);
if(num_files > 1)
{
sprintf(buf, "%s.%d", fname, filenr);
if(All.ICFormat == 3)
sprintf(buf, "%s.%d.hdf5", fname, filenr);
}
else
{
sprintf(buf, "%s", fname);
if(All.ICFormat == 3)
sprintf(buf, "%s.hdf5", fname);
}
ngroups = rest_files / All.NumFilesWrittenInParallel;
if((rest_files % All.NumFilesWrittenInParallel))
ngroups++;
for(gr = 0; gr < ngroups; gr++)
{
if((filenr / All.NumFilesWrittenInParallel) == gr) /* ok, it's this processor's turn */
read_file(buf, masterTask, lastTask);
MPI_Barrier(MPI_COMM_WORLD);
}
}
/* this makes sure that masses are initialized in the case that the mass-block
is completely empty */
for(i = 0; i < NumPart; i++)
{
if(All.MassTable[P[i].Type] != 0)
P[i].Mass = All.MassTable[P[i].Type];
}
if(RestartFlag == 0)
{
if(All.InitGasTemp > 0)
{
u_init = (BOLTZMANN / PROTONMASS) * All.InitGasTemp;
u_init *= All.UnitMass_in_g / All.UnitEnergy_in_cgs; /* unit conversion */
#ifdef ISOTHERM_EQS
u_init *= (3.0/2);
#else
u_init *= (1.0 / GAMMA_MINUS1);
if(All.InitGasTemp > 1.0e4) /* assuming FULL ionization */
molecular_weight = 4 / (8 - 5 * (1 - HYDROGEN_MASSFRAC));
else /* assuming NEUTRAL GAS */
molecular_weight = 4 / (1 + 3 * HYDROGEN_MASSFRAC);
u_init /= molecular_weight;
#endif
for(i = 0; i < N_gas; i++)
{
if(SphP[i].Entropy == 0)
SphP[i].Entropy = u_init;
/* Note: the conversion to entropy will be done in the function init(),
after the densities have been computed */
}
}
}
#ifdef WRITE_ALL_MASSES
for(i = 0; i < 6; i++)
All.MassTable[i] = 0;
#endif
#ifdef MULTIPHASE
for(i = 0; i < N_gas; i++)
{
if(SphP[i].Entropy>0)
SphP[i].Entropy = dmax(All.MinEgySpec, SphP[i].Entropy);
else
SphP[i].Entropy = -dmax(All.MinEgySpec, -SphP[i].Entropy);
}
#else
for(i = 0; i < N_gas; i++)
SphP[i].Entropy = dmax(All.MinEgySpec, SphP[i].Entropy);
#endif
MPI_Barrier(MPI_COMM_WORLD);
if(ThisTask == 0)
{
printf("reading done.\n");
fflush(stdout);
}
if(ThisTask == 0)
{
printf("Total number of particles : %d%09d\n\n",
(int) (All.TotNumPart / 1000000000), (int) (All.TotNumPart % 1000000000));
fflush(stdout);
}
#ifdef GAS_ACCRETION
init_gas_accretion();
#endif
}
/*! This function reads out the buffer that was filled with particle data, and
* stores it at the appropriate place in the particle structures.
*/
void empty_read_buffer(enum iofields blocknr, int offset, int pc, int type)
{
int n, k;
float *fp;
#ifdef LONGIDS
long long *ip;
#else
int *ip;
#endif
fp = CommBuffer;
ip = CommBuffer;
switch (blocknr)
{
case IO_POS: /* positions */
for(n = 0; n < pc; n++)
for(k = 0; k < 3; k++)
P[offset + n].Pos[k] = *fp++;
for(n = 0; n < pc; n++)
P[offset + n].Type = type; /* initialize type here as well */
break;
case IO_VEL: /* velocities */
for(n = 0; n < pc; n++)
for(k = 0; k < 3; k++)
P[offset + n].Vel[k] = *fp++;
break;
case IO_ID: /* particle ID */
for(n = 0; n < pc; n++)
P[offset + n].ID = *ip++;
break;
case IO_MASS: /* particle mass */
for(n = 0; n < pc; n++)
P[offset + n].Mass = *fp++;
break;
case IO_U: /* temperature */
for(n = 0; n < pc; n++)
SphP[offset + n].Entropy = *fp++;
break;
case IO_RHO: /* density */
for(n = 0; n < pc; n++)
SphP[offset + n].Density = *fp++;
break;
case IO_HSML: /* SPH smoothing length */
for(n = 0; n < pc; n++)
SphP[offset + n].Hsml = *fp++;
break;
/* the other input fields (if present) are not needed to define the
initial conditions of the code */
case IO_POT:
case IO_ACCEL:
case IO_DTENTR:
case IO_TSTP:
case IO_ERADSPH:
case IO_ERADSTICKY:
case IO_ERADFEEDBACK:
case IO_ENERGYFLUX:
case IO_OPTVAR1:
case IO_OPTVAR2:
break;
case IO_METALS: /* gas metallicity */
#ifdef CHIMIE
for(n = 0; n < pc; n++)
{
for(k = 0; k < NELEMENTS; k++)
{
SphP[offset + n].Metal[k] = *fp++;
}
}
#endif
break;
case IO_STAR_FORMATIONTIME:
#ifdef STELLAR_PROP
for(n = 0; n < pc; n++)
StP[n].FormationTime = *fp++;
#endif
break;
case IO_INITIAL_MASS:
#ifdef STELLAR_PROP
for(n = 0; n < pc; n++)
StP[n].InitialMass = *fp++;
#endif
break;
case IO_STAR_IDPROJ:
#ifdef STELLAR_PROP
for(n = 0; n < pc; n++)
StP[n].IDProj = *ip++;
#endif
break;
case IO_STAR_RHO:
#ifdef STELLAR_PROP
for(n = 0; n < pc; n++)
StP[n].Density = *fp++;
#endif
break;
case IO_STAR_HSML:
#ifdef STELLAR_PROP
for(n = 0; n < pc; n++)
StP[n].Hsml = *fp++;
#endif
break;
case IO_STAR_METALS:
#ifdef CHIMIE
for(n = 0; n < pc; n++)
{
for(k = 0; k < NELEMENTS; k++)
{
StP[n].Metal[k] = *fp++;
}
}
#endif
break;
}
}
/*! This function reads a snapshot file and distributes the data it contains
* to tasks 'readTask' to 'lastTask'.
*/
void read_file(char *fname, int readTask, int lastTask)
{
int blockmaxlen;
int i, n_in_file, n_for_this_task, ntask, pc, offset = 0, task;
int blksize1, blksize2;
MPI_Status status;
FILE *fd = 0;
int nall;
int type;
char label[4];
int nstart, bytes_per_blockelement, npart, nextblock, typelist[6];
enum iofields blocknr;
#ifdef HAVE_HDF5
char buf[500];
int rank, pcsum;
hid_t hdf5_file, hdf5_grp[6], hdf5_dataspace_in_file;
hid_t hdf5_datatype, hdf5_dataspace_in_memory, hdf5_dataset;
hsize_t dims[2], count[2], start[2];
#endif
#define SKIP {my_fread(&blksize1,sizeof(int),1,fd);}
#define SKIP2 {my_fread(&blksize2,sizeof(int),1,fd);}
if(ThisTask == readTask)
{
if(All.ICFormat == 1 || All.ICFormat == 2)
{
if(!(fd = fopen(fname, "r")))
{
printf("can't open file `%s' for reading initial conditions.\n", fname);
endrun(123);
}
if(All.ICFormat == 2)
{
SKIP;
my_fread(&label, sizeof(char), 4, fd);
my_fread(&nextblock, sizeof(int), 1, fd);
printf("Reading header => '%c%c%c%c' (%d byte)\n", label[0], label[1], label[2], label[3],
nextblock);
SKIP2;
}
SKIP;
my_fread(&header, sizeof(header), 1, fd);
SKIP2;
if(blksize1 != 256 || blksize2 != 256)
{
printf("incorrect header format\n");
fflush(stdout);
endrun(890);
}
#ifdef CHIMIE
if((header.flag_metals!= 0) && (header.flag_metals!= NELEMENTS))
{
printf("\n(Tasks=%d) NELEMENTS (=%d) != header.flag_metals (=%d) !!!\n\n",ThisTask,NELEMENTS,header.flag_metals);
printf("This means that the number of chemical elements stored in your initial condition file is different \n");
printf("from the variable NELEMENTS equal to the one in the chimie parameter file.\n");
printf("You can either modify you initial condition file or change the NELEMENTS and the chimie parameter file.");
endrun(12323);
}
#endif
#ifdef CHIMIE_EXTRAHEADER
if (header.flag_chimie_extraheader)
{
SKIP;
my_fread(&chimie_extraheader, sizeof(chimie_extraheader), 1, fd);
SKIP2;
if(blksize1 != 256 || blksize2 != 256)
{
printf("incorrect chimie_extraheader format\n");
fflush(stdout);
endrun(891);
}
}
#endif
}
#ifdef HAVE_HDF5
if(All.ICFormat == 3)
{
read_header_attributes_in_hdf5(fname);
hdf5_file = H5Fopen(fname, H5F_ACC_RDONLY, H5P_DEFAULT);
for(type = 0; type < 6; type++)
{
if(header.npart[type] > 0)
{
sprintf(buf, "/PartType%d", type);
hdf5_grp[type] = H5Gopen(hdf5_file, buf);
}
}
}
#endif
for(task = readTask + 1; task <= lastTask; task++)
{
MPI_Ssend(&header, sizeof(header), MPI_BYTE, task, TAG_HEADER, MPI_COMM_WORLD);
#ifdef CHIMIE_EXTRAHEADER
if (header.flag_chimie_extraheader)
MPI_Ssend(&header, sizeof(chimie_extraheader), MPI_BYTE, task, TAG_CHIMIE_EXTRAHEADER, MPI_COMM_WORLD);
#endif
}
}
else
{
MPI_Recv(&header, sizeof(header), MPI_BYTE, readTask, TAG_HEADER, MPI_COMM_WORLD, &status);
#ifdef CHIMIE_EXTRAHEADER
if (header.flag_chimie_extraheader)
MPI_Recv(&chimie_extraheader, sizeof(chimie_extraheader), MPI_BYTE, readTask, TAG_CHIMIE_EXTRAHEADER, MPI_COMM_WORLD, &status);
#endif
}
if(All.TotNumPart == 0)
{
if(header.num_files <= 1)
for(i = 0; i < 6; i++)
header.npartTotal[i] = header.npart[i];
All.TotN_gas = header.npartTotal[0] + (((long long) header.npartTotalHighWord[0]) << 32);
#if defined(SFR) || defined(STELLAR_PROP)
All.TotN_stars = header.npartTotal[ST] + (((long long) header.npartTotalHighWord[ST]) << 32);
#endif
for(i = 0, All.TotNumPart = 0; i < 6; i++)
{
All.TotNumPart += header.npartTotal[i];
All.TotNumPart += (((long long) header.npartTotalHighWord[i]) << 32);
}
for(i = 0; i < 6; i++)
All.MassTable[i] = header.mass[i];
All.MaxPart = All.PartAllocFactor * (All.TotNumPart / NTask); /* sets the maximum number of particles that may */
All.MaxPartSph = All.PartAllocFactor * (All.TotN_gas / NTask); /* sets the maximum number of particles that may
reside on a processor */
#ifdef STELLAR_PROP
All.MaxPartStars = All.PartAllocFactor * (All.TotN_stars / NTask); /* existing star particles */
#ifdef SFR
All.MaxPartStars = All.MaxPartStars + All.StarFormationNStarsFromGas*All.MaxPartSph*All.StarsAllocFactor; /* potental star particles */
#endif
#endif
allocate_memory();
if(RestartFlag == 2)
All.Time = All.TimeBegin = header.time;
}
if(ThisTask == readTask)
{
for(i = 0, n_in_file = 0; i < 6; i++)
n_in_file += header.npart[i];
printf("\nreading file `%s' on task=%d (contains %d particles.)\n"
"distributing this file to tasks %d-%d\n"
"Type 0 (gas): %8d (tot=%6d%09d) masstab=%g\n"
"Type 1 (halo): %8d (tot=%6d%09d) masstab=%g\n"
"Type 2 (disk): %8d (tot=%6d%09d) masstab=%g\n"
"Type 3 (bulge): %8d (tot=%6d%09d) masstab=%g\n"
"Type 4 (stars): %8d (tot=%6d%09d) masstab=%g\n"
"Type 5 (bndry): %8d (tot=%6d%09d) masstab=%g\n\n", fname, ThisTask, n_in_file, readTask,
lastTask, header.npart[0], (int) (header.npartTotal[0] / 1000000000),
(int) (header.npartTotal[0] % 1000000000), All.MassTable[0], header.npart[1],
(int) (header.npartTotal[1] / 1000000000), (int) (header.npartTotal[1] % 1000000000),
All.MassTable[1], header.npart[2], (int) (header.npartTotal[2] / 1000000000),
(int) (header.npartTotal[2] % 1000000000), All.MassTable[2], header.npart[3],
(int) (header.npartTotal[3] / 1000000000), (int) (header.npartTotal[3] % 1000000000),
All.MassTable[3], header.npart[4], (int) (header.npartTotal[4] / 1000000000),
(int) (header.npartTotal[4] % 1000000000), All.MassTable[4], header.npart[5],
(int) (header.npartTotal[5] / 1000000000), (int) (header.npartTotal[5] % 1000000000),
All.MassTable[5]);
fflush(stdout);
}
ntask = lastTask - readTask + 1;
/* to collect the gas particles all at the beginning (in case several
snapshot files are read on the current CPU) we move the collisionless
particles such that a gap of the right size is created */
for(type = 0, nall = 0; type < 6; type++)
{
n_in_file = header.npart[type];
n_for_this_task = n_in_file / ntask;
if((ThisTask - readTask) < (n_in_file % ntask))
n_for_this_task++;
nall += n_for_this_task;
}
memmove(&P[N_gas + nall], &P[N_gas], (NumPart - N_gas) * sizeof(struct particle_data));
nstart = N_gas;
for(blocknr = 0; blocknr < IO_NBLOCKS; blocknr++)
{
if(blockpresent(blocknr))
{
#ifndef BLOCK_SKIPPING
if(RestartFlag == 0 && blocknr > IO_U)
continue; /* ignore all other blocks in initial conditions */
#else
if(blockabsent(blocknr))
continue;
#endif
bytes_per_blockelement = get_bytes_per_blockelement(blocknr);
blockmaxlen = ((int) (All.BufferSize * 1024 * 1024)) / bytes_per_blockelement;
npart = get_particles_in_block(blocknr, &typelist[0]);
if(npart > 0)
{
if(ThisTask == readTask)
{
if(All.ICFormat == 2)
{
SKIP;
my_fread(&label, sizeof(char), 4, fd);
my_fread(&nextblock, sizeof(int), 1, fd);
printf("Reading header => '%c%c%c%c' (%d byte)\n", label[0], label[1], label[2],
label[3], nextblock);
SKIP2;
if(strncmp(label, Tab_IO_Labels[blocknr], 4) != 0)
{
printf("incorrect block-structure!\n");
printf("expected '%c%c%c%c' but found '%c%c%c%c'\n",
label[0], label[1], label[2], label[3],
Tab_IO_Labels[blocknr][0], Tab_IO_Labels[blocknr][1],
Tab_IO_Labels[blocknr][2], Tab_IO_Labels[blocknr][3]);
fflush(stdout);
endrun(1890);
}
}
if(All.ICFormat == 1 || All.ICFormat == 2)
SKIP;
}
for(type = 0, offset = 0; type < 6; type++)
{
n_in_file = header.npart[type];
#ifdef HAVE_HDF5
pcsum = 0;
#endif
if(typelist[type] == 0)
{
n_for_this_task = n_in_file / ntask;
if((ThisTask - readTask) < (n_in_file % ntask))
n_for_this_task++;
offset += n_for_this_task;
}
else
{
for(task = readTask; task <= lastTask; task++)
{
n_for_this_task = n_in_file / ntask;
if((task - readTask) < (n_in_file % ntask))
n_for_this_task++;
if(task == ThisTask)
if(NumPart + n_for_this_task > All.MaxPart)
{
printf("too many particles\n");
endrun(1313);
}
do
{
pc = n_for_this_task;
if(pc > blockmaxlen)
pc = blockmaxlen;
if(ThisTask == readTask)
{
if(All.ICFormat == 1 || All.ICFormat == 2)
my_fread(CommBuffer, bytes_per_blockelement, pc, fd);
#ifdef HAVE_HDF5
if(All.ICFormat == 3)
{
get_dataset_name(blocknr, buf);
hdf5_dataset = H5Dopen(hdf5_grp[type], buf);
dims[0] = header.npart[type];
dims[1] = get_values_per_blockelement(blocknr);
if(dims[1] == 1)
rank = 1;
else
rank = 2;
hdf5_dataspace_in_file = H5Screate_simple(rank, dims, NULL);
dims[0] = pc;
hdf5_dataspace_in_memory = H5Screate_simple(rank, dims, NULL);
start[0] = pcsum;
start[1] = 0;
count[0] = pc;
count[1] = get_values_per_blockelement(blocknr);
pcsum += pc;
H5Sselect_hyperslab(hdf5_dataspace_in_file, H5S_SELECT_SET,
start, NULL, count, NULL);
switch (get_datatype_in_block(blocknr))
{
case 0:
hdf5_datatype = H5Tcopy(H5T_NATIVE_UINT);
break;
case 1:
hdf5_datatype = H5Tcopy(H5T_NATIVE_FLOAT);
break;
case 2:
hdf5_datatype = H5Tcopy(H5T_NATIVE_UINT64);
break;
}
H5Dread(hdf5_dataset, hdf5_datatype, hdf5_dataspace_in_memory,
hdf5_dataspace_in_file, H5P_DEFAULT, CommBuffer);
H5Tclose(hdf5_datatype);
H5Sclose(hdf5_dataspace_in_memory);
H5Sclose(hdf5_dataspace_in_file);
H5Dclose(hdf5_dataset);
}
#endif
}
if(ThisTask == readTask && task != readTask)
MPI_Ssend(CommBuffer, bytes_per_blockelement * pc, MPI_BYTE, task, TAG_PDATA,
MPI_COMM_WORLD);
if(ThisTask != readTask && task == ThisTask)
MPI_Recv(CommBuffer, bytes_per_blockelement * pc, MPI_BYTE, readTask,
TAG_PDATA, MPI_COMM_WORLD, &status);
if(ThisTask == task)
{
empty_read_buffer(blocknr, nstart + offset, pc, type);
offset += pc;
}
n_for_this_task -= pc;
}
while(n_for_this_task > 0);
}
}
}
if(ThisTask == readTask)
{
if(All.ICFormat == 1 || All.ICFormat == 2)
{
SKIP2;
if(blksize1 != blksize2)
{
printf("incorrect block-sizes detected!\n");
printf("Task=%d blocknr=%d blksize1=%d blksize2=%d\n", ThisTask, blocknr,
blksize1, blksize2);
fflush(stdout);
endrun(1889);
}
}
}
}
}
}
for(type = 0; type < 6; type++)
{
n_in_file = header.npart[type];
n_for_this_task = n_in_file / ntask;
if((ThisTask - readTask) < (n_in_file % ntask))
n_for_this_task++;
NumPart += n_for_this_task;
if(type == 0)
N_gas += n_for_this_task;
#ifdef SFR
if(type == ST)
N_stars += n_for_this_task;
#endif
}
if(ThisTask == readTask)
{
if(All.ICFormat == 1 || All.ICFormat == 2)
fclose(fd);
#ifdef HAVE_HDF5
if(All.ICFormat == 3)
{
for(type = 5; type >= 0; type--)
if(header.npart[type] > 0)
H5Gclose(hdf5_grp[type]);
H5Fclose(hdf5_file);
}
#endif
}
}
/*! This function determines onto how many files a given snapshot is
* distributed.
*/
int find_files(char *fname)
{
FILE *fd;
char buf[200], buf1[200];
int dummy;
sprintf(buf, "%s.%d", fname, 0);
sprintf(buf1, "%s", fname);
if(All.SnapFormat == 3)
{
sprintf(buf, "%s.%d.hdf5", fname, 0);
sprintf(buf1, "%s.hdf5", fname);
}
#ifndef HAVE_HDF5
if(All.SnapFormat == 3)
{
if(ThisTask == 0)
printf("Code wasn't compiled with HDF5 support enabled!\n");
endrun(0);
}
#endif
header.num_files = 0;
if(ThisTask == 0)
{
if((fd = fopen(buf, "r")))
{
if(All.ICFormat == 1 || All.ICFormat == 2)
{
if(All.ICFormat == 2)
{
fread(&dummy, sizeof(dummy), 1, fd);
fread(&dummy, sizeof(dummy), 1, fd);
fread(&dummy, sizeof(dummy), 1, fd);
fread(&dummy, sizeof(dummy), 1, fd);
}
fread(&dummy, sizeof(dummy), 1, fd);
fread(&header, sizeof(header), 1, fd);
fread(&dummy, sizeof(dummy), 1, fd);
}
fclose(fd);
#ifdef HAVE_HDF5
if(All.ICFormat == 3)
read_header_attributes_in_hdf5(buf);
#endif
}
}
MPI_Bcast(&header, sizeof(header), MPI_BYTE, 0, MPI_COMM_WORLD);
if(header.num_files > 0)
return header.num_files;
if(ThisTask == 0)
{
if((fd = fopen(buf1, "r")))
{
if(All.ICFormat == 1 || All.ICFormat == 2)
{
if(All.ICFormat == 2)
{
fread(&dummy, sizeof(dummy), 1, fd);
fread(&dummy, sizeof(dummy), 1, fd);
fread(&dummy, sizeof(dummy), 1, fd);
fread(&dummy, sizeof(dummy), 1, fd);
}
fread(&dummy, sizeof(dummy), 1, fd);
fread(&header, sizeof(header), 1, fd);
fread(&dummy, sizeof(dummy), 1, fd);
}
fclose(fd);
#ifdef HAVE_HDF5
if(All.ICFormat == 3)
read_header_attributes_in_hdf5(buf1);
#endif
header.num_files = 1;
}
}
MPI_Bcast(&header, sizeof(header), MPI_BYTE, 0, MPI_COMM_WORLD);
if(header.num_files > 0)
return header.num_files;
if(ThisTask == 0)
{
printf("\nCan't find initial conditions file.");
printf("neither as '%s'\nnor as '%s'\n", buf, buf1);
fflush(stdout);
}
endrun(0);
return 0;
}
/*! This function assigns a certain number of files to processors, such that
* each processor is exactly assigned to one file, and the number of cpus per
* file is as homogenous as possible. The number of files may at most be
* equal to the number of processors.
*/
void distribute_file(int nfiles, int firstfile, int firsttask, int lasttask, int *filenr, int *master,
int *last)
{
int ntask, filesleft, filesright, tasksleft, tasksright;
if(nfiles > 1)
{
ntask = lasttask - firsttask + 1;
filesleft = (((double) (ntask / 2)) / ntask) * nfiles;
if(filesleft <= 0)
filesleft = 1;
if(filesleft >= nfiles)
filesleft = nfiles - 1;
filesright = nfiles - filesleft;
tasksleft = ntask / 2;
tasksright = ntask - tasksleft;
distribute_file(filesleft, firstfile, firsttask, firsttask + tasksleft - 1, filenr, master, last);
distribute_file(filesright, firstfile + filesleft, firsttask + tasksleft, lasttask, filenr, master,
last);
}
else
{
if(ThisTask >= firsttask && ThisTask <= lasttask)
{
*filenr = firstfile;
*master = firsttask;
*last = lasttask;
}
}
}
/*! This function reads the header information in case the HDF5 file format is
* used.
*/
#ifdef HAVE_HDF5
void read_header_attributes_in_hdf5(char *fname)
{
hid_t hdf5_file, hdf5_headergrp, hdf5_attribute;
hdf5_file = H5Fopen(fname, H5F_ACC_RDONLY, H5P_DEFAULT);
hdf5_headergrp = H5Gopen(hdf5_file, "/Header");
hdf5_attribute = H5Aopen_name(hdf5_headergrp, "NumPart_ThisFile");
H5Aread(hdf5_attribute, H5T_NATIVE_INT, header.npart);
H5Aclose(hdf5_attribute);
hdf5_attribute = H5Aopen_name(hdf5_headergrp, "NumPart_Total");
H5Aread(hdf5_attribute, H5T_NATIVE_UINT, header.npartTotal);
H5Aclose(hdf5_attribute);
hdf5_attribute = H5Aopen_name(hdf5_headergrp, "NumPart_Total_HighWord");
H5Aread(hdf5_attribute, H5T_NATIVE_UINT, header.npartTotalHighWord);
H5Aclose(hdf5_attribute);
hdf5_attribute = H5Aopen_name(hdf5_headergrp, "MassTable");
H5Aread(hdf5_attribute, H5T_NATIVE_DOUBLE, header.mass);
H5Aclose(hdf5_attribute);
hdf5_attribute = H5Aopen_name(hdf5_headergrp, "Time");
H5Aread(hdf5_attribute, H5T_NATIVE_DOUBLE, &header.time);
H5Aclose(hdf5_attribute);
hdf5_attribute = H5Aopen_name(hdf5_headergrp, "NumFilesPerSnapshot");
H5Aread(hdf5_attribute, H5T_NATIVE_INT, &header.num_files);
H5Aclose(hdf5_attribute);
hdf5_attribute = H5Aopen_name(hdf5_headergrp, "Flag_Entropy_ICs");
H5Aread(hdf5_attribute, H5T_NATIVE_INT, &header.flag_entropy_instead_u);
H5Aclose(hdf5_attribute);
H5Gclose(hdf5_headergrp);
H5Fclose(hdf5_file);
}
#endif

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