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swift.c
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/*******************************************************************************
* This file is part of SWIFT.
* Copyright (c) 2012 Pedro Gonnet ([email protected]),
* Matthieu Schaller ([email protected])
* 2015 Peter W. Draper ([email protected])
* Angus Lepper ([email protected])
* 2016 John A. Regan ([email protected])
* Tom Theuns ([email protected])
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
******************************************************************************/
/* Config parameters. */
#include <config.h>
/* Some standard headers. */
#include <errno.h>
#include <fenv.h>
#include <libgen.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
/* MPI headers. */
#ifdef WITH_MPI
#include <mpi.h>
#endif
/* Local headers. */
#include "argparse.h"
#include "swift.h"
/* Engine policy flags. */
#ifndef ENGINE_POLICY
#define ENGINE_POLICY engine_policy_none
#endif
/* Global profiler. */
struct profiler prof;
/* Usage string. */
static const char *const swift_usage[] = {
"swift [options] [[--] param-file]",
"swift [options] param-file",
"swift_mpi [options] [[--] param-file]",
"swift_mpi [options] param-file",
NULL,
};
/* Function to handle multiple -P arguments. */
struct cmdparams {
const char *param[PARSER_MAX_NO_OF_PARAMS];
int nparam;
};
static int handle_cmdparam(struct argparse *self,
const struct argparse_option *opt) {
struct cmdparams *cmdps = (struct cmdparams *)opt->data;
cmdps->param[cmdps->nparam] = *(char **)opt->value;
cmdps->nparam++;
return 1;
}
/**
* @brief Main routine that loads a few particles and generates some output.
*
*/
int main(int argc, char *argv[]) {
struct clocks_time tic, toc;
struct engine e;
/* Structs used by the engine. Declare now to make sure these are always in
* scope. */
struct chemistry_global_data chemistry;
struct cooling_function_data cooling_func;
struct cosmology cosmo;
struct external_potential potential;
struct forcing_terms forcing_terms;
struct extra_io_properties extra_io_props;
struct star_formation starform;
struct pm_mesh mesh;
struct power_spectrum_data pow_data;
struct gpart *gparts = NULL;
struct gravity_props gravity_properties;
struct hydro_props hydro_properties;
struct stars_props stars_properties;
struct sink_props sink_properties;
struct neutrino_props neutrino_properties;
struct neutrino_response neutrino_response;
struct feedback_props feedback_properties;
struct rt_props rt_properties;
struct entropy_floor_properties entropy_floor;
struct pressure_floor_props pressure_floor_props;
struct black_holes_props black_holes_properties;
struct fof_props fof_properties;
struct lightcone_array_props lightcone_array_properties;
struct part *parts = NULL;
struct phys_const prog_const;
struct space s;
struct spart *sparts = NULL;
struct bpart *bparts = NULL;
struct sink *sinks = NULL;
struct unit_system us;
struct los_props los_properties;
struct ic_info ics_metadata;
int nr_nodes = 1, myrank = 0;
#ifdef WITH_MPI
/* Start by initializing MPI. */
int res = 0, prov = 0;
if ((res = MPI_Init_thread(&argc, &argv, MPI_THREAD_MULTIPLE, &prov)) !=
MPI_SUCCESS)
error("Call to MPI_Init failed with error %i.", res);
if (prov != MPI_THREAD_MULTIPLE)
error(
"MPI does not provide the level of threading"
" required (MPI_THREAD_MULTIPLE).");
if ((res = MPI_Comm_size(MPI_COMM_WORLD, &nr_nodes)) != MPI_SUCCESS)
error("MPI_Comm_size failed with error %i.", res);
if ((res = MPI_Comm_rank(MPI_COMM_WORLD, &myrank)) != MPI_SUCCESS)
error("Call to MPI_Comm_rank failed with error %i.", res);
/* Make sure messages are stamped with the correct rank and step. */
engine_rank = myrank;
engine_current_step = 0;
if ((res = MPI_Comm_set_errhandler(MPI_COMM_WORLD, MPI_ERRORS_RETURN)) !=
MPI_SUCCESS)
error("Call to MPI_Comm_set_errhandler failed with error %i.", res);
if (myrank == 0)
pretime_message("MPI is up and running with %i node(s).\n", nr_nodes);
if (nr_nodes == 1) {
pretime_message("WARNING: you are running with one MPI rank.");
pretime_message(
"WARNING: you should use the non-MPI version of this program.");
}
#endif
/* Welcome to SWIFT, you made the right choice */
if (myrank == 0) greetings(/*fof=*/0);
#ifdef WITH_MPI
/* Sync all output messages starting now to avoid verbose output
* interleaving with greeting. */
fflush(stdout);
MPI_Barrier(MPI_COMM_WORLD);
#endif
int with_aff = 0;
int with_nointerleave = 0;
int with_interleave = 0; /* Deprecated. */
int dry_run = 0;
int dump_tasks = 0;
int dump_cells = 0;
int dump_threadpool = 0;
int nsteps = -2;
int restart = 0;
int with_cosmology = 0;
int with_external_gravity = 0;
int with_temperature = 0;
int with_cooling = 0;
int with_self_gravity = 0;
int with_hydro = 0;
#ifdef MOVING_MESH
int with_grid_hydro = 0;
int with_grid = 0;
#endif
int with_stars = 0;
int with_fof = 0;
int with_lightcone = 0;
int with_star_formation = 0;
int with_feedback = 0;
int with_black_holes = 0;
int with_timestep_limiter = 0;
int with_timestep_sync = 0;
int with_fp_exceptions = 0;
int with_drift_all = 0;
int with_mpole_reconstruction = 0;
int with_structure_finding = 0;
int with_csds = 0;
int with_sinks = 0;
int with_qla = 0;
int with_eagle = 0;
int with_gear = 0;
int with_agora = 0;
int with_line_of_sight = 0;
int with_rt = 0;
int with_power = 0;
int verbose = 0;
int nr_threads = 1;
int nr_pool_threads = -1;
int with_verbose_timers = 0;
char *output_parameters_filename = NULL;
char *cpufreqarg = NULL;
char *param_filename = NULL;
char restart_file[200] = "";
unsigned long long cpufreq = 0;
float dump_tasks_threshold = 0.f;
struct cmdparams cmdps;
cmdps.nparam = 0;
cmdps.param[0] = NULL;
char *buffer = NULL;
/* Parse the command-line parameters. */
struct argparse_option options[] = {
OPT_HELP(),
OPT_GROUP(" Simulation options:\n"),
OPT_BOOLEAN('b', "feedback", &with_feedback, "Run with stars feedback.",
NULL, 0, 0),
OPT_BOOLEAN('c', "cosmology", &with_cosmology,
"Run with cosmological time integration.", NULL, 0, 0),
OPT_BOOLEAN(0, "temperature", &with_temperature,
"Run with temperature calculation.", NULL, 0, 0),
OPT_BOOLEAN('C', "cooling", &with_cooling,
"Run with cooling (also switches on --temperature).", NULL, 0,
0),
OPT_BOOLEAN('D', "drift-all", &with_drift_all,
"Always drift all particles even the ones far from active "
"particles. This emulates Gadget-[23] and GIZMO's default "
"behaviours.",
NULL, 0, 0),
OPT_BOOLEAN('F', "star-formation", &with_star_formation,
"Run with star formation.", NULL, 0, 0),
OPT_BOOLEAN('g', "external-gravity", &with_external_gravity,
"Run with an external gravitational potential.", NULL, 0, 0),
OPT_BOOLEAN('G', "self-gravity", &with_self_gravity,
"Run with self-gravity.", NULL, 0, 0),
OPT_BOOLEAN('M', "multipole-reconstruction", &with_mpole_reconstruction,
"Reconstruct the multipoles every time-step.", NULL, 0, 0),
OPT_BOOLEAN('s', "hydro", &with_hydro, "Run with hydrodynamics.", NULL, 0,
0),
OPT_BOOLEAN('S', "stars", &with_stars, "Run with stars.", NULL, 0, 0),
OPT_BOOLEAN('B', "black-holes", &with_black_holes,
"Run with black holes.", NULL, 0, 0),
OPT_BOOLEAN('k', "sinks", &with_sinks, "Run with sink particles.", NULL,
0, 0),
OPT_BOOLEAN(
'u', "fof", &with_fof,
"Run Friends-of-Friends algorithm to perform black hole seeding.",
NULL, 0, 0),
OPT_BOOLEAN(0, "lightcone", &with_lightcone,
"Generate lightcone outputs.", NULL, 0, 0),
OPT_BOOLEAN('x', "velociraptor", &with_structure_finding,
"Run with structure finding.", NULL, 0, 0),
OPT_BOOLEAN(0, "line-of-sight", &with_line_of_sight,
"Run with line-of-sight outputs.", NULL, 0, 0),
OPT_BOOLEAN(0, "limiter", &with_timestep_limiter,
"Run with time-step limiter.", NULL, 0, 0),
OPT_BOOLEAN(0, "sync", &with_timestep_sync,
"Run with time-step synchronization of particles hit by "
"feedback events.",
NULL, 0, 0),
OPT_BOOLEAN(0, "csds", &with_csds,
"Run with the Continuous Simulation Data Stream (CSDS).",
NULL, 0, 0),
OPT_BOOLEAN('R', "radiation", &with_rt, "Run with radiative transfer.",
NULL, 0, 0),
OPT_BOOLEAN(0, "power", &with_power, "Run with power spectrum outputs.",
NULL, 0, 0),
OPT_GROUP(" Simulation meta-options:\n"),
OPT_BOOLEAN(0, "quick-lyman-alpha", &with_qla,
"Run with all the options needed for the quick Lyman-alpha "
"model. This is equivalent to --hydro --self-gravity --stars "
"--star-formation --cooling.",
NULL, 0, 0),
OPT_BOOLEAN(
0, "eagle", &with_eagle,
"Run with all the options needed for the EAGLE model. This is "
"equivalent to --hydro --limiter --sync --self-gravity --stars "
"--star-formation --cooling --feedback --black-holes --fof.",
NULL, 0, 0),
OPT_BOOLEAN(
0, "gear", &with_gear,
"Run with all the options needed for the GEAR model. This is "
"equivalent to --hydro --limiter --sync --self-gravity --stars "
"--star-formation --cooling --feedback.",
NULL, 0, 0),
OPT_BOOLEAN(
0, "agora", &with_agora,
"Run with all the options needed for the AGORA model. This is "
"equivalent to --hydro --limiter --sync --self-gravity --stars "
"--star-formation --cooling --feedback.",
NULL, 0, 0),
OPT_GROUP(" Control options:\n"),
OPT_BOOLEAN('a', "pin", &with_aff,
"Pin runners using processor affinity.", NULL, 0, 0),
OPT_BOOLEAN(0, "nointerleave", &with_nointerleave,
"Do not interleave memory allocations across NUMA regions.",
NULL, 0, 0),
OPT_BOOLEAN(0, "interleave", &with_interleave,
"Deprecated option, now default", NULL, 0, 0),
OPT_BOOLEAN('d', "dry-run", &dry_run,
"Dry run. Read the parameter file, allocates memory but does "
"not read the particles from ICs. Exits before the start of "
"time integration. Checks the validity of parameters and IC "
"files as well as memory limits.",
NULL, 0, 0),
OPT_BOOLEAN('e', "fpe", &with_fp_exceptions,
"Enable floating-point exceptions (debugging mode).", NULL, 0,
0),
OPT_STRING('f', "cpu-frequency", &cpufreqarg,
"Overwrite the CPU "
"frequency (Hz) to be used for time measurements.",
NULL, 0, 0),
OPT_INTEGER('n', "steps", &nsteps,
"Execute a fixed number of time steps. When unset use the "
"time_end parameter to stop.",
NULL, 0, 0),
OPT_STRING('o', "output-params", &output_parameters_filename,
"Generate a parameter file with the options for selecting the "
"output fields.",
NULL, 0, 0),
OPT_STRING('P', "param", &buffer,
"Set parameter value, overiding the value read from the "
"parameter file. Can be used more than once {sec:par:value}.",
handle_cmdparam, (intptr_t)&cmdps, 0),
OPT_BOOLEAN('r', "restart", &restart, "Continue using restart files.",
NULL, 0, 0),
OPT_INTEGER(
't', "threads", &nr_threads,
"The number of task threads to use on each MPI rank. Defaults to "
"1 if not specified.",
NULL, 0, 0),
OPT_INTEGER(0, "pool-threads", &nr_pool_threads,
"The number of threads to use on each MPI rank for the "
"threadpool operations. "
"Defaults to the numbers of task threads if not specified.",
NULL, 0, 0),
OPT_INTEGER('T', "timers", &with_verbose_timers,
"Print timers every time-step.", NULL, 0, 0),
OPT_INTEGER('v', "verbose", &verbose,
"Run in verbose mode, in MPI mode 2 outputs from all ranks.",
NULL, 0, 0),
OPT_INTEGER('y', "task-dumps", &dump_tasks,
"Time-step frequency at which task graphs are dumped.", NULL,
0, 0),
OPT_INTEGER(0, "cell-dumps", &dump_cells,
"Time-step frequency at which cell graphs are dumped.", NULL,
0, 0),
OPT_INTEGER('Y', "threadpool-dumps", &dump_threadpool,
"Time-step frequency at which threadpool tasks are dumped.",
NULL, 0, 0),
OPT_FLOAT(0, "dump-tasks-threshold", &dump_tasks_threshold,
"Fraction of the total step's time spent in a task to trigger "
"a dump of the task plot on this step",
NULL, 0, 0),
OPT_END(),
};
struct argparse argparse;
argparse_init(&argparse, options, swift_usage, 0);
argparse_describe(&argparse, "\nParameters:",
"\nSee the file examples/parameter_example.yml for an "
"example of parameter file.");
int nargs = argparse_parse(&argparse, argc, (const char **)argv);
/* Deal with meta options */
if (with_qla) {
with_hydro = 1;
with_self_gravity = 1;
with_stars = 1;
with_star_formation = 1;
with_cooling = 1;
}
if (with_eagle) {
with_hydro = 1;
with_timestep_limiter = 1;
with_timestep_sync = 1;
with_self_gravity = 1;
with_stars = 1;
with_star_formation = 1;
with_cooling = 1;
with_feedback = 1;
with_black_holes = 1;
with_fof = 1;
}
if (with_gear) {
with_hydro = 1;
with_timestep_limiter = 1;
with_timestep_sync = 1;
with_self_gravity = 1;
with_stars = 1;
with_star_formation = 1;
with_cooling = 1;
with_feedback = 1;
}
if (with_agora) {
with_hydro = 1;
with_timestep_limiter = 1;
with_timestep_sync = 1;
with_self_gravity = 1;
with_stars = 1;
with_star_formation = 1;
with_cooling = 1;
with_feedback = 1;
}
#ifdef MOVING_MESH
if (with_hydro) {
with_grid = 1;
}
#endif
/* Deal with thread numbers */
if (nr_threads <= 0)
error("Invalid number of threads provided (%d), must be > 0.", nr_threads);
if (nr_pool_threads == -1) nr_pool_threads = nr_threads;
/* Write output parameter file */
if (myrank == 0 && output_parameters_filename != NULL) {
io_write_output_field_parameter(output_parameters_filename, with_cosmology,
with_fof, with_structure_finding);
pretime_message("End of run.");
return 0;
}
/* Need a parameter file. */
if (nargs != 1) {
if (myrank == 0) argparse_usage(&argparse);
pretime_message("\nError: no parameter file was supplied.");
return 1;
}
param_filename = argv[0];
/* Checks of options. */
#if !defined(HAVE_SETAFFINITY) || !defined(HAVE_LIBNUMA)
if (with_aff) {
pretime_message("Error: no NUMA support for thread affinity.");
return 1;
}
#endif
/* Interleave option is not fatal since we want to use it by default. */
if (with_interleave)
pretime_message(
"WARNING: the --interleave option is deprecated and ignored.");
#if !defined(HAVE_LIBNUMA)
if (!with_nointerleave || with_interleave) {
if (verbose)
pretime_message("WARNING: no NUMA support for interleaving memory.\n");
}
#endif
#if !defined(WITH_CSDS)
if (with_csds) {
pretime_message(
"Error: the CSDS is not available, please compile with "
"--enable-csds.");
return 1;
}
#endif
#ifndef HAVE_FE_ENABLE_EXCEPT
if (with_fp_exceptions) {
pretime_message("Error: no support for floating point exceptions.");
return 1;
}
#endif
#ifndef HAVE_VELOCIRAPTOR
if (with_structure_finding) {
pretime_message("Error: VELOCIraptor is not available.");
return 1;
}
#endif
#ifndef SWIFT_DEBUG_TASKS
if (dump_tasks) {
if (myrank == 0) {
pretime_message(
"WARNING: complete task dumps are only created when "
"configured with --enable-task-debugging.");
pretime_message(" Basic task statistics will be output.");
}
}
#endif
if (dump_tasks_threshold > 0.f) {
#ifndef SWIFT_DEBUG_TASKS
if (myrank == 0) {
error(
"Error: Dumping task plot data above a fixed time threshold is only "
"valid when the code is configured with --enable-task-debugging.");
}
#endif
#ifdef WITH_MPI
if (nr_nodes > 1)
error("Cannot dump tasks above a time threshold over MPI (yet).");
#endif
}
#ifndef SWIFT_CELL_GRAPH
if (dump_cells) {
if (myrank == 0) {
error(
"complete cell dumps are only created when "
"configured with --enable-cell-graph.");
}
}
#endif
#ifndef SWIFT_DEBUG_THREADPOOL
if (dump_threadpool) {
pretime_message(
"Error: threadpool dumping is only possible if SWIFT was "
"configured with the --enable-threadpool-debugging option.");
return 1;
}
#endif
#ifdef WITH_MPI
#ifdef SWIFT_DEBUG_CHECKS
if (with_sinks) {
pretime_message("Warning: sink particles are are WIP yet with MPI.");
}
#else
if (with_sinks) {
pretime_message("Error: sink particles are not available yet with MPI.");
return 1;
}
#endif /* SWIFT_DEBUG_CHECKS */
#endif /* WITH_MPI */
if (with_sinks && with_star_formation) {
pretime_message(
"Error: The sink particles are not supposed to be run with star "
"formation.");
return 1;
}
/* The CPU frequency is a long long, so we need to parse that ourselves. */
if (cpufreqarg != NULL) {
if (sscanf(cpufreqarg, "%llu", &cpufreq) != 1) {
if (myrank == 0)
pretime_message("Error parsing CPU frequency (%s).", cpufreqarg);
return 1;
}
}
if (!with_self_gravity && !with_hydro && !with_external_gravity) {
if (myrank == 0) {
argparse_usage(&argparse);
pretime_message(
"\nError: At least one of --hydro, --external-gravity"
" or --self-gravity must be chosen.");
}
return 1;
}
if (with_stars && !with_external_gravity && !with_self_gravity) {
if (myrank == 0) {
argparse_usage(&argparse);
pretime_message(
"\nError: Cannot process stars without gravity, --external-gravity "
"or --self-gravity must be chosen.");
}
return 1;
}
if (with_black_holes && !with_self_gravity) {
if (myrank == 0) {
argparse_usage(&argparse);
pretime_message(
"Error: Cannot process black holes without self-gravity, "
"--self-gravity must be chosen.\n");
}
return 1;
}
if (with_fof) {
#ifndef WITH_FOF
error("Running with FOF but compiled without it!");
#endif
}
if (with_fof && !with_self_gravity) {
if (myrank == 0)
pretime_message(
"Error: Cannot perform FOF search without gravity,"
" --external-gravity or --self-gravity must be chosen.");
return 1;
}
if (with_lightcone) {
#ifndef WITH_LIGHTCONE
error("Running with lightcone output but compiled without it!");
#endif
if (!with_cosmology)
error("Error: cannot make lightcones without --cosmology.");
}
if (!with_stars && with_star_formation) {
if (myrank == 0) {
argparse_usage(&argparse);
pretime_message(
"Error: Cannot process star formation without stars, --stars must "
"be chosen.");
}
return 1;
}
if (!with_stars && with_feedback) {
if (myrank == 0) {
argparse_usage(&argparse);
pretime_message(
"Error: Cannot process feedback without stars, --stars must be "
"chosen.");
}
return 1;
}
if (!with_hydro && with_feedback) {
if (myrank == 0) {
argparse_usage(&argparse);
pretime_message(
"Error: Cannot process feedback without gas, --hydro must be "
"chosen.");
}
return 1;
}
if (!with_hydro && with_black_holes) {
if (myrank == 0) {
argparse_usage(&argparse);
pretime_message(
"Error: Cannot process black holes without gas, --hydro must be "
"chosen.");
}
return 1;
}
if (!with_hydro && with_line_of_sight) {
if (myrank == 0) {
argparse_usage(&argparse);
pretime_message(
"Error: Cannot use line-of-sight outputs without gas, --hydro must "
"be chosen.");
}
return 1;
}
#ifdef RT_NONE
if (with_rt) {
error("Running with radiative transfer but compiled without it!");
}
#else
if (!with_rt) {
error("Running without radiative transfer but compiled with it!");
}
if (with_rt && !with_hydro) {
error(
"Error: Cannot use radiative transfer without gas, --hydro must be "
"chosen.");
}
if (with_rt && !with_stars) {
/* In principle we can run without stars, but I don't trust the user to
* remember to add the flag every time they want to run RT. */
error(
"Error: Cannot use radiative transfer without stars, --stars must be "
"chosen.");
}
if (with_rt && !with_feedback) {
error(
"Error: Cannot use radiative transfer without --feedback "
"(even if configured --with-feedback=none).");
}
if (with_rt && with_cooling) {
error("Error: Cannot use radiative transfer and cooling simultaneously.");
}
#endif /* idfef RT_NONE */
#ifdef SINK_NONE
if (with_sinks) {
error("Running with sink particles but compiled without them!");
}
#endif
#ifdef TRACERS_EAGLE
if (!with_cooling && !with_temperature)
error(
"Error: Cannot use EAGLE tracers without --cooling or --temperature.");
#endif
/* Let's pin the main thread, now we know if affinity will be used. */
#if defined(HAVE_SETAFFINITY) && defined(HAVE_LIBNUMA) && defined(_GNU_SOURCE)
if (with_aff &&
((ENGINE_POLICY)&engine_policy_setaffinity) == engine_policy_setaffinity)
engine_pin();
#endif
#if defined(HAVE_LIBNUMA) && defined(_GNU_SOURCE)
/* Set the NUMA memory policy to interleave. */
if (!with_nointerleave) engine_numa_policies(myrank, verbose);
#endif
/* Genesis 1.1: And then, there was time ! */
clocks_set_cpufreq(cpufreq);
/* Are we running with gravity */
const int with_gravity = (with_self_gravity || with_external_gravity);
/* How vocal are we ? */
const int talking = (verbose == 1 && myrank == 0) || (verbose == 2);
if (myrank == 0 && dry_run)
message(
"Executing a dry run. No i/o or time integration will be performed.");
/* Report CPU frequency.*/
cpufreq = clocks_get_cpufreq();
if (myrank == 0) {
message("CPU frequency used for tick conversion: %llu Hz", cpufreq);
}
/* Report host name(s). */
#ifdef WITH_MPI
if (talking) {
message("Rank %d running on: %s", myrank, hostname());
}
#else
message("Running on: %s", hostname());
#endif
/* Do we have debugging checks ? */
#ifdef SWIFT_DEBUG_CHECKS
if (myrank == 0)
message("WARNING: Debugging checks activated. Code will be slower !");
#endif
/* Do we have debugging checks ? */
#ifdef SWIFT_USE_NAIVE_INTERACTIONS
if (myrank == 0)
message(
"WARNING: Naive cell interactions activated. Code will be slower !");
#endif
/* Do we have gravity accuracy checks ? */
#ifdef SWIFT_GRAVITY_FORCE_CHECKS
if (myrank == 0)
message(
"WARNING: Checking 1/%d of all gpart for gravity accuracy. Code will "
"be slower !",
SWIFT_GRAVITY_FORCE_CHECKS);
#endif
/* Do we have hydro accuracy checks ? */
#ifdef SWIFT_HYDRO_DENSITY_CHECKS
if (myrank == 0)
message(
"WARNING: Checking 1/%d of all part for hydro accuracy. Code will be "
"slower !",
SWIFT_HYDRO_DENSITY_CHECKS);
#endif
/* Do we choke on FP-exceptions ? */
if (with_fp_exceptions) {
#ifdef HAVE_FE_ENABLE_EXCEPT
feenableexcept(FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW);
#endif
if (myrank == 0)
message("WARNING: Floating point exceptions will be reported.");
}
/* Do we have slow barriers? */
#ifndef HAVE_PTHREAD_BARRIERS
if (myrank == 0)
message("WARNING: Non-optimal thread barriers are being used.");
#endif
/* How large are the parts? */
if (myrank == 0) {
message("sizeof(part) is %4zi bytes.", sizeof(struct part));
message("sizeof(xpart) is %4zi bytes.", sizeof(struct xpart));
message("sizeof(sink) is %4zi bytes.", sizeof(struct sink));
message("sizeof(spart) is %4zi bytes.", sizeof(struct spart));
message("sizeof(bpart) is %4zi bytes.", sizeof(struct bpart));
message("sizeof(gpart) is %4zi bytes.", sizeof(struct gpart));
message("sizeof(multipole) is %4zi bytes.", sizeof(struct multipole));
message("sizeof(grav_tensor) is %4zi bytes.", sizeof(struct grav_tensor));
message("sizeof(task) is %4zi bytes.", sizeof(struct task));
message("sizeof(cell) is %4zi bytes.", sizeof(struct cell));
}
/* Read the parameter file */
struct swift_params *params =
(struct swift_params *)malloc(sizeof(struct swift_params));
/* In scope reference for a potential copy when restarting. */
struct swift_params *refparams = NULL;
if (params == NULL) error("Error allocating memory for the parameter file.");
if (myrank == 0) {
message("Reading runtime parameters from file '%s'", param_filename);
parser_read_file(param_filename, params);
/* Handle any command-line overrides. */
if (cmdps.nparam > 0) {
message(
"Overwriting values read from the YAML file with command-line "
"values.");
for (int k = 0; k < cmdps.nparam; k++)
parser_set_param(params, cmdps.param[k]);
}
}
#ifdef WITH_MPI
/* Broadcast the parameter file */
MPI_Bcast(params, sizeof(struct swift_params), MPI_BYTE, 0, MPI_COMM_WORLD);
#endif
/* Read the provided output selection file, if available. Best to
* do this after broadcasting the parameters as there may be code in this
* function that is repeated on each node based on the parameter file. */
struct output_options *output_options =
(struct output_options *)malloc(sizeof(struct output_options));
output_options_init(params, myrank, output_options);
/* Temporary early aborts for modes not supported over MPI. */
#ifdef WITH_MPI
if (with_mpole_reconstruction && nr_nodes > 1)
error("Cannot reconstruct m-poles every step over MPI (yet).");
#endif
/* Temporary early aborts for modes not supported with hand-vec. */
#if defined(WITH_VECTORIZATION) && defined(GADGET2_SPH) && \
!defined(CHEMISTRY_NONE)
error(
"Cannot run with chemistry and hand-vectorization (yet). "
"Use --disable-hand-vec at configure time.");
#endif
/* Check that we can write the snapshots by testing if the output
* directory exists and is searchable and writable. */
char basename[PARSER_MAX_LINE_SIZE];
parser_get_param_string(params, "Snapshots:basename", basename);
const char *dirp = dirname(basename);
if (access(dirp, W_OK | X_OK) != 0) {
error("Cannot write snapshots in directory %s (%s)", dirp, strerror(errno));
}
/* Check that we can write the structure finding catalogues by testing if the
* output directory exists and is searchable and writable. */
if (with_structure_finding) {
char stfbasename[PARSER_MAX_LINE_SIZE];
parser_get_param_string(params, "StructureFinding:basename", stfbasename);
const char *stfdirp = dirname(stfbasename);
if (access(stfdirp, W_OK | X_OK) != 0) {
error("Cannot write stf catalogues in directory %s (%s)", stfdirp,
strerror(errno));
}
}
/* Check that we can write the line of sight files by testing if the
* output directory exists and is searchable and writable. */
if (with_line_of_sight) {
char losbasename[PARSER_MAX_LINE_SIZE];
parser_get_param_string(params, "LineOfSight:basename", losbasename);
const char *losdirp = dirname(losbasename);
if (access(losdirp, W_OK | X_OK) != 0) {
error("Cannot write line of sight in directory %s (%s)", losdirp,
strerror(errno));
}
}
/* Prepare the domain decomposition scheme */
struct repartition reparttype;
#ifdef WITH_MPI
struct partition initial_partition;
partition_init(&initial_partition, &reparttype, params, nr_nodes);
/* Let's report what we did */
if (myrank == 0) {
#if defined(HAVE_PARMETIS)
if (reparttype.usemetis)
message("Using METIS serial partitioning:");
else
message("Using ParMETIS partitioning:");
#elif defined(HAVE_METIS)
message("Using METIS serial partitioning:");
#else
message("Non-METIS partitioning:");
#endif
message(" initial partitioning: %s",
initial_partition_name[initial_partition.type]);
if (initial_partition.type == INITPART_GRID)
message(" grid set to [ %i %i %i ].", initial_partition.grid[0],
initial_partition.grid[1], initial_partition.grid[2]);
message(" repartitioning: %s", repartition_name[reparttype.type]);
}
#endif
/* Common variables for restart and IC sections. */
int clean_smoothing_length_values = 0;
int flag_entropy_ICs = 0;
/* Work out where we will read and write restart files. */
char restart_dir[PARSER_MAX_LINE_SIZE];
parser_get_opt_param_string(params, "Restarts:subdir", restart_dir,
"restart");
/* The directory must exist. */
if (myrank == 0) {
if (access(restart_dir, W_OK | X_OK) != 0) {
if (restart) {
error("Cannot restart as no restart subdirectory: %s (%s)", restart_dir,
strerror(errno));
} else {
if (mkdir(restart_dir, 0777) != 0)
error("Failed to create restart directory: %s (%s)", restart_dir,
strerror(errno));
}
}
}
/* Basename for any restart files. */
char restart_name[PARSER_MAX_LINE_SIZE];
parser_get_opt_param_string(params, "Restarts:basename", restart_name,
"swift");
/* If restarting, look for the restart files. */
if (restart) {
/* Attempting a restart. */
char **restart_files = NULL;
int restart_nfiles = 0;
if (myrank == 0) {
message("Restarting SWIFT");
/* Locate the restart files. */
restart_files =
restart_locate(restart_dir, restart_name, &restart_nfiles);
if (restart_nfiles == 0)
error("Failed to locate any restart files in %s", restart_dir);
/* We need one file per rank. */
if (restart_nfiles != nr_nodes)
error("Incorrect number of restart files, expected %d found %d",
nr_nodes, restart_nfiles);
if (verbose > 0)
for (int i = 0; i < restart_nfiles; i++)
message("found restart file: %s", restart_files[i]);
}
#ifdef WITH_MPI
/* Distribute the restart files, need one for each rank. */
if (myrank == 0) {
for (int i = 1; i < nr_nodes; i++) {
strcpy(restart_file, restart_files[i]);
MPI_Send(restart_file, 200, MPI_BYTE, i, 0, MPI_COMM_WORLD);
}
/* Keep local file. */
strcpy(restart_file, restart_files[0]);
/* Finished with the list. */
restart_locate_free(restart_nfiles, restart_files);
} else {
MPI_Recv(restart_file, 200, MPI_BYTE, 0, 0, MPI_COMM_WORLD,
MPI_STATUS_IGNORE);
}
if (verbose > 1) message("local restart file = %s", restart_file);
#else
/* Just one restart file. */
strcpy(restart_file, restart_files[0]);
/* Finished with the list. */
restart_locate_free(1, restart_files);
#endif
/* Now read it. */
restart_read(&e, restart_file);
#ifdef WITH_MPI
integertime_t min_ti_current = e.ti_current;
integertime_t max_ti_current = e.ti_current;