1 /* Copyright (c) 2009-2018. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 /* sg_config: configuration infrastructure for the simulation world */
8 #include "simgrid/sg_config.hpp"
9 #include "instr/instr_interface.hpp"
11 #include "simgrid/instr.h"
12 #include "src/internal_config.h"
13 #include "src/kernel/lmm/maxmin.hpp"
14 #include "src/mc/mc_replay.hpp"
15 #include "src/surf/surf_interface.hpp"
16 #include "surf/surf.hpp"
17 #include "xbt/config.h"
18 #include "xbt/config.hpp"
20 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_config, surf, "About the configuration of SimGrid");
23 /* 0: beginning of time (config cannot be changed yet);
24 * 1: initialized: cfg_set created (config can now be changed);
25 * 2: configured: command line parsed and config part of platform file was
26 * integrated also, platform construction ongoing or done.
27 * (Config cannot be changed anymore!)
29 int _sg_cfg_init_status = 0;
31 /* instruct the upper layer (simix or simdag) to exit as soon as possible */
32 int _sg_cfg_exit_asap = 0;
34 #define sg_cfg_exit_early() do { _sg_cfg_exit_asap = 1; return; } while (0)
36 /* Parse the command line, looking for options */
37 static void sg_config_cmd_line(int *argc, char **argv)
43 for (j = i = 1; i < *argc; i++) {
44 if (not strncmp(argv[i], "--cfg=", strlen("--cfg="))) {
45 char *opt = strchr(argv[i], '=');
48 xbt_cfg_set_parse(opt);
49 XBT_DEBUG("Did apply '%s' as config setting", opt);
50 } else if (not strcmp(argv[i], "--version")) {
51 printf("%s\n", SIMGRID_VERSION_STRING);
53 } else if (not strcmp(argv[i], "--cfg-help") || not strcmp(argv[i], "--help")) {
54 printf("Description of the configuration accepted by this simulator:\n");
58 "Each of these configurations can be used by adding\n"
59 " --cfg=<option name>:<option value>\n"
60 "to the command line.\n"
62 "For more information, please refer to:\n"
63 " --help-aliases for the list of all option aliases.\n"
64 " --help-logs and --help-log-categories for the details of logging output.\n"
65 " --help-models for a list of all models known by this simulator.\n"
66 " --help-tracing for the details of all tracing options known by this simulator.\n"
67 " --version to get SimGrid version information.\n"
71 } else if (not strcmp(argv[i], "--help-aliases")) {
72 printf("Here is a list of all deprecated option names, with their replacement.\n");
74 printf("Please consider using the recent names\n");
76 } else if (not strcmp(argv[i], "--help-models")) {
77 model_help("host", surf_host_model_description);
79 model_help("CPU", surf_cpu_model_description);
81 model_help("network", surf_network_model_description);
82 printf("\nLong description of all optimization levels accepted by the models of this simulator:\n");
83 for (int k = 0; surf_optimization_mode_description[k].name; k++)
85 surf_optimization_mode_description[k].name,
86 surf_optimization_mode_description[k].description);
87 printf("Both network and CPU models have 'Lazy' as default optimization level\n\n");
89 } else if (not strcmp(argv[i], "--help-tracing")) {
104 /* callback of the plugin variable */
105 static void _sg_cfg_cb__plugin(const char *name)
107 xbt_assert(_sg_cfg_init_status < 2, "Cannot load a plugin after the initialization");
109 std::string val = xbt_cfg_get_string(name);
114 model_help("plugin", surf_plugin_description);
118 int plugin_id = find_model_description(surf_plugin_description, val);
119 surf_plugin_description[plugin_id].model_init_preparse();
122 /* callback of the host/model variable */
123 static void _sg_cfg_cb__host_model(const char *name)
125 xbt_assert(_sg_cfg_init_status < 2, "Cannot change the model after the initialization");
127 std::string val = xbt_cfg_get_string(name);
129 model_help("host", surf_host_model_description);
133 /* Make sure that the model exists */
134 find_model_description(surf_host_model_description, val);
137 /* callback of the cpu/model variable */
138 static void _sg_cfg_cb__cpu_model(const char *name)
140 xbt_assert(_sg_cfg_init_status < 2, "Cannot change the model after the initialization");
142 std::string val = xbt_cfg_get_string(name);
144 model_help("CPU", surf_cpu_model_description);
148 /* New Module missing */
149 find_model_description(surf_cpu_model_description, val);
152 /* callback of the cpu/model variable */
153 static void _sg_cfg_cb__optimization_mode(const char *name)
155 xbt_assert(_sg_cfg_init_status < 2, "Cannot change the model after the initialization");
157 std::string val = xbt_cfg_get_string(name);
159 model_help("optimization", surf_optimization_mode_description);
163 /* New Module missing */
164 find_model_description(surf_optimization_mode_description, val);
167 /* callback of the cpu/model variable */
168 static void _sg_cfg_cb__storage_mode(const char *name)
170 xbt_assert(_sg_cfg_init_status < 2, "Cannot change the model after the initialization");
172 std::string val = xbt_cfg_get_string(name);
174 model_help("storage", surf_storage_model_description);
178 find_model_description(surf_storage_model_description, val);
181 /* callback of the network_model variable */
182 static void _sg_cfg_cb__network_model(const char *name)
184 xbt_assert(_sg_cfg_init_status < 2, "Cannot change the model after the initialization");
186 std::string val = xbt_cfg_get_string(name);
188 model_help("network", surf_network_model_description);
192 /* New Module missing */
193 find_model_description(surf_network_model_description, val);
195 /* callback to decide if we want to use the model-checking */
196 #include "src/xbt_modinter.h"
198 static void _sg_cfg_cb_model_check_replay(const char *name) {
199 MC_record_path = xbt_cfg_get_string(name);
203 extern int _sg_do_model_check_record;
204 static void _sg_cfg_cb_model_check_record(const char *name) {
205 _sg_do_model_check_record = xbt_cfg_get_boolean(name);
209 extern int _sg_do_verbose_exit;
210 static void _sg_cfg_cb_verbose_exit(const char *name)
212 _sg_do_verbose_exit = xbt_cfg_get_boolean(name);
215 extern int _sg_do_clean_atexit;
216 static void _sg_cfg_cb_clean_atexit(const char *name)
218 _sg_do_clean_atexit = xbt_cfg_get_boolean(name);
221 static void _sg_cfg_cb_context_stack_size(const char *name)
223 smx_context_stack_size_was_set = 1;
224 smx_context_stack_size = xbt_cfg_get_int(name) * 1024;
227 static void _sg_cfg_cb_context_guard_size(const char *name)
229 smx_context_guard_size_was_set = 1;
230 smx_context_guard_size = xbt_cfg_get_int(name) * xbt_pagesize;
233 static void _sg_cfg_cb_contexts_nthreads(const char *name)
235 SIMIX_context_set_nthreads(xbt_cfg_get_int(name));
238 static void _sg_cfg_cb_contexts_parallel_threshold(const char *name)
240 SIMIX_context_set_parallel_threshold(xbt_cfg_get_int(name));
243 static void _sg_cfg_cb_contexts_parallel_mode(const char *name)
245 std::string mode_name = xbt_cfg_get_string(name);
246 if (mode_name == "posix") {
247 SIMIX_context_set_parallel_mode(XBT_PARMAP_POSIX);
248 } else if (mode_name == "futex") {
249 SIMIX_context_set_parallel_mode(XBT_PARMAP_FUTEX);
250 } else if (mode_name == "busy_wait") {
251 SIMIX_context_set_parallel_mode(XBT_PARMAP_BUSY_WAIT);
253 xbt_die("Command line setting of the parallel synchronization mode should "
254 "be one of \"posix\", \"futex\" or \"busy_wait\"");
258 /* build description line with possible values */
259 static void describe_model(char *result,int resultsize,
260 const s_surf_model_description_t model_description[],
262 const char *description)
266 p += snprintf(result,resultsize-1, "%s. Possible values: %s", description,
267 model_description[0].name ? model_description[0].name : "n/a");
268 for (int i = 1; model_description[i].name; i++)
269 p += snprintf(p,resultsize-(p-result)-1, ", %s", model_description[i].name);
270 p += snprintf(p,resultsize-(p-result)-1, ".\n (use 'help' as a value to see the long description of each %s)", name);
272 xbt_assert(p<result+resultsize-1,"Buffer too small to display the model description of %s",name);
275 /* create the config set, register what should be and parse the command line*/
276 void sg_config_init(int *argc, char **argv)
278 const int descsize = 1024;
279 char description[descsize];
281 /* Create the configuration support */
282 if (_sg_cfg_init_status != 0) { /* Only create stuff if not already inited */
283 XBT_WARN("Call to sg_config_init() after initialization ignored");
287 /* Plugins configuration */
288 describe_model(description, descsize, surf_plugin_description, "plugin", "The plugins");
289 xbt_cfg_register_string("plugin", "", &_sg_cfg_cb__plugin, description);
291 describe_model(description, descsize, surf_cpu_model_description, "model", "The model to use for the CPU");
292 xbt_cfg_register_string("cpu/model", "Cas01", &_sg_cfg_cb__cpu_model, description);
294 describe_model(description, descsize, surf_storage_model_description, "model", "The model to use for the storage");
295 xbt_cfg_register_string("storage/model", "default", &_sg_cfg_cb__storage_mode, description);
297 describe_model(description, descsize, surf_network_model_description, "model", "The model to use for the network");
298 xbt_cfg_register_string("network/model", "LV08", &_sg_cfg_cb__network_model, description);
300 describe_model(description, descsize, surf_optimization_mode_description, "optimization mode",
301 "The optimization modes to use for the network");
302 xbt_cfg_register_string("network/optim", "Lazy", &_sg_cfg_cb__optimization_mode, description);
304 describe_model(description, descsize, surf_host_model_description, "model", "The model to use for the host");
305 xbt_cfg_register_string("host/model", "default", &_sg_cfg_cb__host_model, description);
307 simgrid::config::bindFlag(sg_surf_precision, "surf/precision",
308 "Numerical precision used when updating simulation times (in seconds)");
310 simgrid::config::bindFlag(sg_maxmin_precision, "maxmin/precision",
311 "Numerical precision used when computing resource sharing (in flops/sec or bytes/sec)");
313 simgrid::config::bindFlag(sg_concurrency_limit, "maxmin/concurrency-limit", {"maxmin/concurrency_limit"},
314 "Maximum number of concurrent variables in the maxmim system. Also limits the number of "
315 "processes on each host, at higher level. (default: -1 means no such limitation)");
317 /* The parameters of network models */
319 sg_latency_factor = 13.01; // comes from the default LV08 network model
320 simgrid::config::bindFlag(sg_latency_factor, "network/latency-factor", {"network/latency_factor"},
321 "Correction factor to apply to the provided latency (default value set by network model)");
323 sg_bandwidth_factor = 0.97; // comes from the default LV08 network model
324 simgrid::config::bindFlag(
325 sg_bandwidth_factor, "network/bandwidth-factor", {"network/bandwidth_factor"},
326 "Correction factor to apply to the provided bandwidth (default value set by network model)");
328 sg_weight_S_parameter = 20537; // comes from the default LV08 network model
329 simgrid::config::bindFlag(
330 sg_weight_S_parameter, "network/weight-S", {"network/weight_S"},
331 "Correction factor to apply to the weight of competing streams (default value set by network model)");
334 simgrid::config::declareFlag<std::string>("path", "Lookup path for inclusions in platform and deployment XML files",
335 "", [](std::string const& path) {
336 if (path[0] != '\0') {
337 surf_path.push_back(path);
341 xbt_cfg_register_boolean("cpu/maxmin-selective-update", "no", nullptr, "Update the constraint set propagating "
342 "recursively to others constraints (off by "
343 "default unless optim is set to lazy)");
344 simgrid::config::alias("cpu/maxmin-selective-update", {"cpu/maxmin_selective_update"});
345 xbt_cfg_register_boolean("network/maxmin-selective-update", "no", nullptr, "Update the constraint set propagating "
346 "recursively to others constraints (off "
347 "by default unless optim is set to lazy)");
348 simgrid::config::alias("network/maxmin-selective-update", {"network/maxmin_selective_update"});
349 /* Replay (this part is enabled even if MC it disabled) */
350 xbt_cfg_register_string("model-check/replay", nullptr, _sg_cfg_cb_model_check_replay,
351 "Model-check path to replay (as reported by SimGrid when a violation is reported)");
354 /* do model-checking-record */
355 xbt_cfg_register_boolean("model-check/record", "no", _sg_cfg_cb_model_check_record,
356 "Record the model-checking paths");
358 xbt_cfg_register_int("model-check/checkpoint", 0, _mc_cfg_cb_checkpoint,
359 "Specify the amount of steps between checkpoints during stateful model-checking (default: 0 => "
360 "stateless verification). "
361 "If value=1, one checkpoint is saved for each step => faster verification, but huge memory "
362 "consumption; higher values are good compromises between speed and memory consumption.");
364 xbt_cfg_register_boolean("model-check/sparse-checkpoint", "no", _mc_cfg_cb_sparse_checkpoint,
365 "Use sparse per-page snapshots.");
366 xbt_cfg_register_boolean("model-check/ksm", "no", _mc_cfg_cb_ksm, "Kernel same-page merging");
368 xbt_cfg_register_string("model-check/property", "", _mc_cfg_cb_property,
369 "Name of the file containing the property, as formatted by the ltl2ba program.");
370 xbt_cfg_register_boolean("model-check/communications-determinism", "no", _mc_cfg_cb_comms_determinism,
371 "Whether to enable the detection of communication determinism");
372 simgrid::config::alias("model-check/communications-determinism", {"model-check/communications_determinism"});
374 xbt_cfg_register_boolean("model-check/send-determinism", "no", _mc_cfg_cb_send_determinism,
375 "Enable/disable the detection of send-determinism in the communications schemes");
376 simgrid::config::alias("model-check/send-determinism", {"model-check/send_determinism"});
378 /* Specify the kind of model-checking reduction */
379 xbt_cfg_register_string("model-check/reduction", "dpor", _mc_cfg_cb_reduce,
380 "Specify the kind of exploration reduction (either none or DPOR)");
381 xbt_cfg_register_boolean("model-check/timeout", "no", _mc_cfg_cb_timeout,
382 "Whether to enable timeouts for wait requests");
384 xbt_cfg_register_boolean("model-check/hash", "no", _mc_cfg_cb_hash,
385 "Whether to enable state hash for state comparison (experimental)");
386 xbt_cfg_register_boolean("model-check/snapshot-fds", "no", _mc_cfg_cb_snapshot_fds,
387 "Whether file descriptors must be snapshoted (currently unusable)");
388 simgrid::config::alias("model-check/snapshot-fds", {"model-check/snapshot_fds"});
389 xbt_cfg_register_int("model-check/max-depth", 1000, _mc_cfg_cb_max_depth,
390 "Maximal exploration depth (default: 1000)");
391 simgrid::config::alias("model-check/max-depth", {"model-check/max_depth"});
392 xbt_cfg_register_int("model-check/visited", 0, _mc_cfg_cb_visited,
393 "Specify the number of visited state stored for state comparison reduction. If value=5, the "
394 "last 5 visited states are stored. If value=0 (the default), all states are stored.");
396 xbt_cfg_register_string("model-check/dot-output", "", _mc_cfg_cb_dot_output,
397 "Name of dot output file corresponding to graph state");
398 simgrid::config::alias("model-check/dot-output", {"model-check/dot_output"});
399 xbt_cfg_register_boolean("model-check/termination", "no", _mc_cfg_cb_termination,
400 "Whether to enable non progressive cycle detection");
403 xbt_cfg_register_boolean("verbose-exit", "yes", _sg_cfg_cb_verbose_exit,
404 "Activate the \"do nothing\" mode in Ctrl-C");
406 xbt_cfg_register_int("contexts/stack-size", 8 * 1024, _sg_cfg_cb_context_stack_size, "Stack size of contexts in KiB");
407 /* (FIXME: this is unpleasant) Reset this static variable that was altered when setting the default value. */
408 smx_context_stack_size_was_set = 0;
409 simgrid::config::alias("contexts/stack-size", {"contexts/stack_size"});
411 /* guard size for contexts stacks in memory pages */
412 xbt_cfg_register_int("contexts/guard-size",
413 #if defined(_WIN32) || (PTH_STACKGROWTH != -1)
418 _sg_cfg_cb_context_guard_size, "Guard size for contexts stacks in memory pages");
419 /* No, it was not set yet (the above setdefault() changed this to 1). */
420 smx_context_guard_size_was_set = 0;
421 simgrid::config::alias("contexts/guard-size", {"contexts/guard_size"});
422 xbt_cfg_register_int("contexts/nthreads", 1, _sg_cfg_cb_contexts_nthreads,
423 "Number of parallel threads used to execute user contexts");
425 xbt_cfg_register_int("contexts/parallel-threshold", 2, _sg_cfg_cb_contexts_parallel_threshold,
426 "Minimal number of user contexts to be run in parallel (raw contexts only)");
427 simgrid::config::alias("contexts/parallel-threshold", {"contexts/parallel_threshold"});
429 /* synchronization mode for parallel user contexts */
431 xbt_cfg_register_string(
432 "contexts/synchro", "futex", _sg_cfg_cb_contexts_parallel_mode,
433 "Synchronization mode to use when running contexts in parallel (either futex, posix or busy_wait)");
434 #else //No futex on mac and posix is unimplememted yet
435 xbt_cfg_register_string(
436 "contexts/synchro", "busy_wait", _sg_cfg_cb_contexts_parallel_mode,
437 "Synchronization mode to use when running contexts in parallel (either futex, posix or busy_wait)");
440 // For smpi/bw-factor and smpi/lat-factor
441 // SMPI model can be used without enable_smpi, so keep this out of the ifdef.
442 xbt_cfg_register_string("smpi/bw-factor", "65472:0.940694;15424:0.697866;9376:0.58729;5776:1.08739;3484:0.77493;1426:"
443 "0.608902;732:0.341987;257:0.338112;0:0.812084",
444 nullptr, "Bandwidth factors for smpi. Format: "
445 "'threshold0:value0;threshold1:value1;...;thresholdN:valueN', meaning if(size "
446 ">=thresholdN ) return valueN.");
447 simgrid::config::alias("smpi/bw-factor", {"smpi/bw_factor"});
449 xbt_cfg_register_string("smpi/lat-factor", "65472:11.6436;15424:3.48845;9376:2.59299;5776:2.18796;3484:1.88101;1426:"
450 "1.61075;732:1.9503;257:1.95341;0:2.01467",
451 nullptr, "Latency factors for smpi.");
452 simgrid::config::alias("smpi/lat-factor", {"smpi/lat_factor"});
453 xbt_cfg_register_string("smpi/IB-penalty-factors", "0.965;0.925;1.35", nullptr,
454 "Correction factor to communications using Infiniband model with contention (default value "
455 "based on Stampede cluster profiling)");
456 simgrid::config::alias("smpi/IB-penalty-factors", {"smpi/IB_penalty_factors"});
459 xbt_cfg_register_double("smpi/host-speed", 20000.0, nullptr,
460 "Speed of the host running the simulation (in flop/s). Used to bench the operations.");
461 simgrid::config::alias("smpi/host-speed", {"smpi/running_power", "smpi/running-power"});
463 xbt_cfg_register_boolean("smpi/keep-temps", "no", nullptr, "Whether we should keep the generated temporary files.");
465 xbt_cfg_register_boolean("smpi/display-timing", "no", nullptr,
466 "Whether we should display the timing after simulation.");
467 simgrid::config::alias("smpi/display-timing", {"smpi/display_timing"});
469 xbt_cfg_register_boolean("smpi/simulate-computation", "yes", nullptr,
470 "Whether the computational part of the simulated application should be simulated.");
471 simgrid::config::alias("smpi/simulate-computation", {"smpi/simulate_computation"});
473 xbt_cfg_register_string("smpi/shared-malloc", "global", nullptr,
474 "Whether SMPI_SHARED_MALLOC is enabled. Disable it for debugging purposes.");
475 simgrid::config::alias("smpi/shared-malloc", {"smpi/use_shared_malloc", "smpi/use-shared-malloc"});
476 xbt_cfg_register_double("smpi/shared-malloc-blocksize", 1UL << 20, nullptr,
477 "Size of the bogus file which will be created for global shared allocations");
478 xbt_cfg_register_string("smpi/shared-malloc-hugepage", "", nullptr,
479 "Path to a mounted hugetlbfs, to use huge pages with shared malloc.");
481 xbt_cfg_register_double("smpi/cpu-threshold", 1e-6, nullptr,
482 "Minimal computation time (in seconds) not discarded, or -1 for infinity.");
483 simgrid::config::alias("smpi/cpu-threshold", {"smpi/cpu_threshold"});
485 xbt_cfg_register_int("smpi/async-small-thresh", 0, nullptr,
486 "Maximal size of messages that are to be sent asynchronously, without waiting for the receiver");
487 simgrid::config::alias("smpi/async-small-thresh", {"smpi/async_small_thres", "smpi/async_small_thresh"});
489 xbt_cfg_register_boolean("smpi/trace-call-location", "no", nullptr,
490 "Should filename and linenumber of MPI calls be traced?");
492 xbt_cfg_register_int("smpi/send-is-detached-thresh", 65536, nullptr,
493 "Threshold of message size where MPI_Send stops behaving like MPI_Isend and becomes MPI_Ssend");
494 simgrid::config::alias("smpi/send-is-detached-thresh",
495 {"smpi/send_is_detached_thres", "smpi/send_is_detached_thresh"});
497 const char* default_privatization = std::getenv("SMPI_PRIVATIZATION");
498 if (default_privatization == nullptr)
499 default_privatization = "no";
501 xbt_cfg_register_string("smpi/privatization", default_privatization, nullptr,
502 "How we should privatize global variable at runtime (no, yes, mmap, dlopen).");
504 simgrid::config::alias("smpi/privatization", {"smpi/privatize_global_variables", "smpi/privatize-global-variables"});
506 xbt_cfg_register_boolean("smpi/grow-injected-times", "yes", nullptr,
507 "Whether we want to make the injected time in MPI_Iprobe and MPI_Test grow, to allow faster "
508 "simulation. This can make simulation less precise, though.");
511 xbt_cfg_register_string("smpi/papi-events", nullptr, nullptr,
512 "This switch enables tracking the specified counters with PAPI");
514 xbt_cfg_register_string("smpi/comp-adjustment-file", nullptr, nullptr,
515 "A file containing speedups or slowdowns for some parts of the code.");
516 xbt_cfg_register_string("smpi/os", "0:0:0:0:0", nullptr,
517 "Small messages timings (MPI_Send minimum time for small messages)");
518 xbt_cfg_register_string("smpi/ois", "0:0:0:0:0", nullptr,
519 "Small messages timings (MPI_Isend minimum time for small messages)");
520 xbt_cfg_register_string("smpi/or", "0:0:0:0:0", nullptr,
521 "Small messages timings (MPI_Recv minimum time for small messages)");
523 xbt_cfg_register_double("smpi/iprobe-cpu-usage", 1, nullptr, "Maximum usage of CPUs by MPI_Iprobe() calls. We've "
524 "observed that MPI_Iprobes consume significantly less "
525 "power than the maximum of a specific application. This "
526 "value is then (Iprobe_Usage/Max_Application_Usage).");
528 xbt_cfg_register_string("smpi/coll-selector", "default", nullptr, "Which collective selector to use");
529 simgrid::config::alias("smpi/coll-selector", {"smpi/coll_selector"});
530 xbt_cfg_register_string("smpi/gather", nullptr, nullptr, "Which collective to use for gather");
531 xbt_cfg_register_string("smpi/allgather", nullptr, nullptr, "Which collective to use for allgather");
532 xbt_cfg_register_string("smpi/barrier", nullptr, nullptr, "Which collective to use for barrier");
533 xbt_cfg_register_string("smpi/reduce_scatter", nullptr, nullptr, "Which collective to use for reduce_scatter");
534 simgrid::config::alias("smpi/reduce_scatter", {"smpi/reduce-scatter"});
535 xbt_cfg_register_string("smpi/scatter", nullptr, nullptr, "Which collective to use for scatter");
536 xbt_cfg_register_string("smpi/allgatherv", nullptr, nullptr, "Which collective to use for allgatherv");
537 xbt_cfg_register_string("smpi/allreduce", nullptr, nullptr, "Which collective to use for allreduce");
538 xbt_cfg_register_string("smpi/alltoall", nullptr, nullptr, "Which collective to use for alltoall");
539 xbt_cfg_register_string("smpi/alltoallv", nullptr, nullptr, "Which collective to use for alltoallv");
540 xbt_cfg_register_string("smpi/bcast", nullptr, nullptr, "Which collective to use for bcast");
541 xbt_cfg_register_string("smpi/reduce", nullptr, nullptr, "Which collective to use for reduce");
546 sg_storage_max_file_descriptors = 1024;
547 simgrid::config::bindFlag(sg_storage_max_file_descriptors, "storage/max_file_descriptors",
548 "Maximum number of concurrently opened files per host. Default is 1024");
552 xbt_cfg_register_boolean("exception/cutpath", "no", nullptr,
553 "Whether to cut all path information from call traces, used e.g. in exceptions.");
555 xbt_cfg_register_boolean("clean-atexit", "yes", _sg_cfg_cb_clean_atexit,
556 "Whether to cleanup SimGrid at exit. Disable it if your code segfaults after its end.");
557 simgrid::config::alias("clean-atexit", {"clean_atexit"});
559 if (surf_path.empty())
560 xbt_cfg_setdefault_string("path", "./");
562 _sg_cfg_init_status = 1;
564 sg_config_cmd_line(argc, argv);
566 xbt_mallocator_initialization_is_done(SIMIX_context_is_parallel());
569 void sg_config_finalize()
571 if (not _sg_cfg_init_status)
572 return; /* Not initialized yet. Nothing to do */
574 xbt_cfg_free(&simgrid_config);
575 _sg_cfg_init_status = 0;