1 /* Copyright (c) 2009-2019. 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 "simgrid/instr.h"
10 #include "src/instr/instr_private.hpp"
11 #include "src/internal_config.h"
12 #include "src/kernel/lmm/maxmin.hpp"
13 #include "src/mc/mc_config.hpp"
14 #include "src/mc/mc_replay.hpp"
15 #include "src/surf/surf_interface.hpp"
16 #include "surf/surf.hpp"
17 #include "xbt/config.hpp"
19 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_config, surf, "About the configuration of SimGrid");
21 static simgrid::config::Flag<bool> cfg_continue_after_help
22 {"help-nostop", "Do not stop the execution when --help is found", false};
24 /** @brief Allow other libraries to react to the --help flag, too
26 * When finding --help on the command line, simgrid usually stops right after displaying its help message.
27 * If you are writing a library using simgrid, you may want to display your own help message before everything stops.
28 * If so, just call this function before having simgrid parsing the command line, and you will be given the control
29 * even if the user is asking for help.
31 void sg_config_continue_after_help()
33 cfg_continue_after_help = true;
36 /* 0: beginning of time (config cannot be changed yet)
37 * 1: initialized: cfg_set created (config can now be changed)
38 * 2: configured: command line parsed and config part of platform file was
39 * integrated also, platform construction ongoing or done.
40 * (Config cannot be changed anymore!)
42 int _sg_cfg_init_status = 0;
44 /* Parse the command line, looking for options */
45 static void sg_config_cmd_line(int *argc, char **argv)
47 bool shall_exit = false;
50 bool parse_args = true; // Stop parsing the parameters once we found '--'
52 for (j = i = 1; i < *argc; i++) {
53 if (not strcmp("--", argv[i])) {
55 // Remove that '--' from the arguments
56 } else if (parse_args && not strncmp(argv[i], "--cfg=", strlen("--cfg="))) {
57 char *opt = strchr(argv[i], '=');
60 simgrid::config::set_parse(opt);
61 XBT_DEBUG("Did apply '%s' as config setting", opt);
62 } else if (parse_args && not strcmp(argv[i], "--version")) {
65 } else if (parse_args && (not strcmp(argv[i], "--cfg-help") || not strcmp(argv[i], "--help"))) {
66 printf("Description of the configuration accepted by this simulator:\n");
67 simgrid::config::help();
70 "Each of these configurations can be used by adding\n"
71 " --cfg=<option name>:<option value>\n"
72 "to the command line.\n"
74 "For more information, please refer to:\n"
75 " --help-aliases for the list of all option aliases.\n"
76 " --help-logs and --help-log-categories for the details of logging output.\n"
77 " --help-models for a list of all models known by this simulator.\n"
78 " --help-tracing for the details of all tracing options known by this simulator.\n"
79 " --version to get SimGrid version information.\n"
82 shall_exit = not cfg_continue_after_help;
83 argv[j++] = argv[i]; // Preserve the --help in argv just in case someone else wants to see it
84 } else if (parse_args && not strcmp(argv[i], "--help-aliases")) {
85 printf("Here is a list of all deprecated option names, with their replacement.\n");
86 simgrid::config::show_aliases();
87 printf("Please consider using the recent names\n");
89 } else if (parse_args && not strcmp(argv[i], "--help-models")) {
90 model_help("host", surf_host_model_description);
92 model_help("CPU", surf_cpu_model_description);
94 model_help("network", surf_network_model_description);
95 printf("\nLong description of all optimization levels accepted by the models of this simulator:\n");
96 for (int k = 0; surf_optimization_mode_description[k].name; k++)
98 surf_optimization_mode_description[k].name,
99 surf_optimization_mode_description[k].description);
100 printf("Both network and CPU models have 'Lazy' as default optimization level\n\n");
102 } else if (parse_args && not strcmp(argv[i], "--help-tracing")) {
117 /* callback of the plugin variable */
118 static void _sg_cfg_cb__plugin(const std::string& value)
120 xbt_assert(_sg_cfg_init_status < 2, "Cannot load a plugin after the initialization");
125 if (value == "help") {
126 model_help("plugin", surf_plugin_description);
130 int plugin_id = find_model_description(surf_plugin_description, value);
131 surf_plugin_description[plugin_id].model_init_preparse();
134 /* callback of the host/model variable */
135 static void _sg_cfg_cb__host_model(const std::string& value)
137 xbt_assert(_sg_cfg_init_status < 2, "Cannot change the model after the initialization");
139 if (value == "help") {
140 model_help("host", surf_host_model_description);
144 /* Make sure that the model exists */
145 find_model_description(surf_host_model_description, value);
148 /* callback of the cpu/model variable */
149 static void _sg_cfg_cb__cpu_model(const std::string& value)
151 xbt_assert(_sg_cfg_init_status < 2, "Cannot change the model after the initialization");
153 if (value == "help") {
154 model_help("CPU", surf_cpu_model_description);
158 /* New Module missing */
159 find_model_description(surf_cpu_model_description, value);
162 /* callback of the cpu/model variable */
163 static void _sg_cfg_cb__optimization_mode(const std::string& value)
165 xbt_assert(_sg_cfg_init_status < 2, "Cannot change the model after the initialization");
167 if (value == "help") {
168 model_help("optimization", surf_optimization_mode_description);
172 /* New Module missing */
173 find_model_description(surf_optimization_mode_description, value);
176 /* callback of the cpu/model variable */
177 static void _sg_cfg_cb__storage_mode(const std::string& value)
179 xbt_assert(_sg_cfg_init_status < 2, "Cannot change the model after the initialization");
181 if (value == "help") {
182 model_help("storage", surf_storage_model_description);
186 find_model_description(surf_storage_model_description, value);
189 /* callback of the network_model variable */
190 static void _sg_cfg_cb__network_model(const std::string& value)
192 xbt_assert(_sg_cfg_init_status < 2, "Cannot change the model after the initialization");
194 if (value == "help") {
195 model_help("network", surf_network_model_description);
199 /* New Module missing */
200 find_model_description(surf_network_model_description, value);
203 static void _sg_cfg_cb_contexts_parallel_mode(const std::string& mode_name)
205 if (mode_name == "posix") {
206 SIMIX_context_set_parallel_mode(XBT_PARMAP_POSIX);
207 } else if (mode_name == "futex") {
208 SIMIX_context_set_parallel_mode(XBT_PARMAP_FUTEX);
209 } else if (mode_name == "busy_wait") {
210 SIMIX_context_set_parallel_mode(XBT_PARMAP_BUSY_WAIT);
212 xbt_die("Command line setting of the parallel synchronization mode should "
213 "be one of \"posix\", \"futex\" or \"busy_wait\"");
217 /* build description line with possible values */
218 static void describe_model(char *result,int resultsize,
219 const s_surf_model_description_t model_description[],
221 const char *description)
225 p += snprintf(result,resultsize-1, "%s. Possible values: %s", description,
226 model_description[0].name ? model_description[0].name : "n/a");
227 for (int i = 1; model_description[i].name; i++)
228 p += snprintf(p,resultsize-(p-result)-1, ", %s", model_description[i].name);
229 p += snprintf(p,resultsize-(p-result)-1, ".\n (use 'help' as a value to see the long description of each %s)", name);
231 xbt_assert(p<result+resultsize-1,"Buffer too small to display the model description of %s",name);
234 /* create the config set, register what should be and parse the command line*/
235 void sg_config_init(int *argc, char **argv)
237 const int descsize = 1024;
238 char description[descsize];
240 /* Create the configuration support */
241 if (_sg_cfg_init_status != 0) { /* Only create stuff if not already inited */
242 XBT_WARN("Call to sg_config_init() after initialization ignored");
246 /* Plugins configuration */
247 describe_model(description, descsize, surf_plugin_description, "plugin", "The plugins");
248 simgrid::config::declare_flag<std::string>("plugin", description, "", &_sg_cfg_cb__plugin);
250 describe_model(description, descsize, surf_cpu_model_description, "model", "The model to use for the CPU");
251 simgrid::config::declare_flag<std::string>("cpu/model", description, "Cas01", &_sg_cfg_cb__cpu_model);
253 describe_model(description, descsize, surf_storage_model_description, "model", "The model to use for the storage");
254 simgrid::config::declare_flag<std::string>("storage/model", description, "default", &_sg_cfg_cb__storage_mode);
256 describe_model(description, descsize, surf_network_model_description, "model", "The model to use for the network");
257 simgrid::config::declare_flag<std::string>("network/model", description, "LV08", &_sg_cfg_cb__network_model);
259 describe_model(description, descsize, surf_optimization_mode_description, "optimization mode",
260 "The optimization modes to use for the network");
261 simgrid::config::declare_flag<std::string>("network/optim", description, "Lazy", &_sg_cfg_cb__optimization_mode);
263 describe_model(description, descsize, surf_host_model_description, "model", "The model to use for the host");
264 simgrid::config::declare_flag<std::string>("host/model", description, "default", &_sg_cfg_cb__host_model);
266 simgrid::config::bind_flag(sg_surf_precision, "surf/precision",
267 "Numerical precision used when updating simulation times (in seconds)");
269 simgrid::config::bind_flag(sg_maxmin_precision, "maxmin/precision",
270 "Numerical precision used when computing resource sharing (in flops/sec or bytes/sec)");
272 simgrid::config::bind_flag(sg_concurrency_limit, "maxmin/concurrency-limit", {"maxmin/concurrency_limit"},
273 "Maximum number of concurrent variables in the maxmim system. Also limits the number of "
274 "processes on each host, at higher level. (default: -1 means no such limitation)");
276 /* The parameters of network models */
278 sg_latency_factor = 13.01; // comes from the default LV08 network model
279 simgrid::config::bind_flag(sg_latency_factor, "network/latency-factor", {"network/latency_factor"},
280 "Correction factor to apply to the provided latency (default value set by network model)");
282 sg_bandwidth_factor = 0.97; // comes from the default LV08 network model
283 simgrid::config::bind_flag(
284 sg_bandwidth_factor, "network/bandwidth-factor", {"network/bandwidth_factor"},
285 "Correction factor to apply to the provided bandwidth (default value set by network model)");
287 sg_weight_S_parameter = 20537; // comes from the default LV08 network model
288 simgrid::config::bind_flag(
289 sg_weight_S_parameter, "network/weight-S", {"network/weight_S"},
290 "Correction factor to apply to the weight of competing streams (default value set by network model)");
293 simgrid::config::declare_flag<std::string>("path", "Lookup path for inclusions in platform and deployment XML files",
294 "", [](std::string const& path) {
295 if (not path.empty())
296 surf_path.push_back(path);
299 simgrid::config::declare_flag<bool>("cpu/maxmin-selective-update",
300 "Update the constraint set propagating recursively to others constraints "
301 "(off by default unless optim is set to lazy)",
303 simgrid::config::alias("cpu/maxmin-selective-update", {"cpu/maxmin_selective_update"});
304 simgrid::config::declare_flag<bool>("network/maxmin-selective-update", "Update the constraint set propagating "
305 "recursively to others constraints (off by "
306 "default unless optim is set to lazy)",
308 simgrid::config::alias("network/maxmin-selective-update", {"network/maxmin_selective_update"});
310 extern bool _sg_do_verbose_exit;
311 simgrid::config::bind_flag(_sg_do_verbose_exit, "verbose-exit", "Activate the \"do nothing\" mode in Ctrl-C");
313 simgrid::config::declare_flag<int>("contexts/stack-size", "Stack size of contexts in KiB (not with threads)",
314 8 * 1024, [](int value) { smx_context_stack_size = value * 1024; });
315 simgrid::config::alias("contexts/stack-size", {"contexts/stack_size"});
317 /* guard size for contexts stacks in memory pages */
318 #if defined(_WIN32) || (PTH_STACKGROWTH != -1)
319 int default_guard_size = 0;
321 int default_guard_size = 1;
323 simgrid::config::declare_flag<int>("contexts/guard-size", "Guard size for contexts stacks in memory pages",
325 [](int value) { smx_context_guard_size = value * xbt_pagesize; });
326 simgrid::config::alias("contexts/guard-size", {"contexts/guard_size"});
327 simgrid::config::declare_flag<int>("contexts/nthreads", "Number of parallel threads used to execute user contexts", 1,
328 &SIMIX_context_set_nthreads);
330 simgrid::config::declare_flag<int>("contexts/parallel-threshold",
331 "Minimal number of user contexts to be run in parallel (raw contexts only)", 2,
332 &SIMIX_context_set_parallel_threshold);
333 simgrid::config::alias("contexts/parallel-threshold", {"contexts/parallel_threshold"});
335 /* synchronization mode for parallel user contexts */
337 std::string default_synchro_mode = "futex";
338 #else // No futex on mac and posix is unimplemented yet
339 std::string default_synchro_mode = "busy_wait";
341 simgrid::config::declare_flag<std::string>("contexts/synchro", "Synchronization mode to use when running contexts in "
342 "parallel (either futex, posix or busy_wait)",
343 default_synchro_mode, &_sg_cfg_cb_contexts_parallel_mode);
345 // For smpi/bw-factor and smpi/lat-factor
346 // SMPI model can be used without enable_smpi, so keep this out of the ifdef.
347 simgrid::config::declare_flag<std::string>("smpi/bw-factor",
348 "Bandwidth factors for smpi. Format: "
349 "'threshold0:value0;threshold1:value1;...;thresholdN:valueN', "
350 "meaning if(size >=thresholdN ) return valueN.",
351 "65472:0.940694;15424:0.697866;9376:0.58729;5776:1.08739;3484:0.77493;"
352 "1426:0.608902;732:0.341987;257:0.338112;0:0.812084");
353 simgrid::config::alias("smpi/bw-factor", {"smpi/bw_factor"});
355 simgrid::config::declare_flag<std::string>("smpi/lat-factor", "Latency factors for smpi.",
356 "65472:11.6436;15424:3.48845;9376:2.59299;5776:2.18796;3484:1.88101;"
357 "1426:1.61075;732:1.9503;257:1.95341;0:2.01467");
358 simgrid::config::alias("smpi/lat-factor", {"smpi/lat_factor"});
359 simgrid::config::declare_flag<std::string>("smpi/IB-penalty-factors",
360 "Correction factor to communications using Infiniband model with "
361 "contention (default value based on Stampede cluster profiling)",
363 simgrid::config::alias("smpi/IB-penalty-factors", {"smpi/IB_penalty_factors"});
366 simgrid::config::declare_flag<double>("smpi/host-speed", "Speed of the host running the simulation (in flop/s). "
367 "Used to bench the operations.",
369 simgrid::config::alias("smpi/host-speed", {"smpi/running_power", "smpi/running-power"});
371 simgrid::config::declare_flag<bool>("smpi/keep-temps", "Whether we should keep the generated temporary files.",
374 simgrid::config::declare_flag<bool>("smpi/display-timing", "Whether we should display the timing after simulation.",
376 simgrid::config::alias("smpi/display-timing", {"smpi/display_timing"});
378 simgrid::config::declare_flag<bool>(
379 "smpi/simulate-computation", "Whether the computational part of the simulated application should be simulated.",
381 simgrid::config::alias("smpi/simulate-computation", {"smpi/simulate_computation"});
383 simgrid::config::declare_flag<std::string>(
384 "smpi/shared-malloc", "Whether SMPI_SHARED_MALLOC is enabled. Disable it for debugging purposes.", "global");
385 simgrid::config::alias("smpi/shared-malloc", {"smpi/use_shared_malloc", "smpi/use-shared-malloc"});
386 simgrid::config::declare_flag<double>("smpi/shared-malloc-blocksize",
387 "Size of the bogus file which will be created for global shared allocations",
389 simgrid::config::declare_flag<std::string>("smpi/shared-malloc-hugepage",
390 "Path to a mounted hugetlbfs, to use huge pages with shared malloc.", "");
392 simgrid::config::declare_flag<double>(
393 "smpi/cpu-threshold", "Minimal computation time (in seconds) not discarded, or -1 for infinity.", 1e-6);
394 simgrid::config::alias("smpi/cpu-threshold", {"smpi/cpu_threshold"});
396 simgrid::config::declare_flag<int>(
397 "smpi/async-small-thresh",
398 "Maximal size of messages that are to be sent asynchronously, without waiting for the receiver", 0);
399 simgrid::config::alias("smpi/async-small-thresh", {"smpi/async_small_thres", "smpi/async_small_thresh"});
401 simgrid::config::declare_flag<bool>("smpi/trace-call-location",
402 "Should filename and linenumber of MPI calls be traced?", false);
404 simgrid::config::declare_flag<int>(
405 "smpi/send-is-detached-thresh",
406 "Threshold of message size where MPI_Send stops behaving like MPI_Isend and becomes MPI_Ssend", 65536);
407 simgrid::config::alias("smpi/send-is-detached-thresh",
408 {"smpi/send_is_detached_thres", "smpi/send_is_detached_thresh"});
410 const char* default_privatization = std::getenv("SMPI_PRIVATIZATION");
411 if (default_privatization == nullptr)
412 default_privatization = "no";
414 simgrid::config::declare_flag<std::string>(
415 "smpi/privatization", "How we should privatize global variable at runtime (no, yes, mmap, dlopen).",
416 default_privatization);
417 simgrid::config::alias("smpi/privatization", {"smpi/privatize_global_variables", "smpi/privatize-global-variables"});
419 simgrid::config::declare_flag<std::string>(
420 "smpi/privatize-libs", "Add libraries (; separated) to privatize (libgfortran for example). You need to provide the full names of the files (libgfortran.so.4), or its full path", "");
422 simgrid::config::declare_flag<bool>("smpi/grow-injected-times",
423 "Whether we want to make the injected time in MPI_Iprobe and MPI_Test grow, to "
424 "allow faster simulation. This can make simulation less precise, though.",
428 simgrid::config::declare_flag<std::string>("smpi/papi-events",
429 "This switch enables tracking the specified counters with PAPI", "");
431 simgrid::config::declare_flag<std::string>("smpi/comp-adjustment-file",
432 "A file containing speedups or slowdowns for some parts of the code.", "");
433 simgrid::config::declare_flag<std::string>(
434 "smpi/os", "Small messages timings (MPI_Send minimum time for small messages)", "0:0:0:0:0");
435 simgrid::config::declare_flag<std::string>(
436 "smpi/ois", "Small messages timings (MPI_Isend minimum time for small messages)", "0:0:0:0:0");
437 simgrid::config::declare_flag<std::string>(
438 "smpi/or", "Small messages timings (MPI_Recv minimum time for small messages)", "0:0:0:0:0");
440 simgrid::config::declare_flag<double>("smpi/iprobe-cpu-usage",
441 "Maximum usage of CPUs by MPI_Iprobe() calls. We've observed that MPI_Iprobes "
442 "consume significantly less power than the maximum of a specific application. "
443 "This value is then (Iprobe_Usage/Max_Application_Usage).",
446 simgrid::config::declare_flag<std::string>("smpi/coll-selector", "Which collective selector to use", "default");
447 simgrid::config::alias("smpi/coll-selector", {"smpi/coll_selector"});
448 simgrid::config::declare_flag<std::string>("smpi/gather", "Which collective to use for gather", "");
449 simgrid::config::declare_flag<std::string>("smpi/allgather", "Which collective to use for allgather", "");
450 simgrid::config::declare_flag<std::string>("smpi/barrier", "Which collective to use for barrier", "");
451 simgrid::config::declare_flag<std::string>("smpi/reduce_scatter", "Which collective to use for reduce_scatter", "");
452 simgrid::config::alias("smpi/reduce_scatter", {"smpi/reduce-scatter"});
453 simgrid::config::declare_flag<std::string>("smpi/scatter", "Which collective to use for scatter", "");
454 simgrid::config::declare_flag<std::string>("smpi/allgatherv", "Which collective to use for allgatherv", "");
455 simgrid::config::declare_flag<std::string>("smpi/allreduce", "Which collective to use for allreduce", "");
456 simgrid::config::declare_flag<std::string>("smpi/alltoall", "Which collective to use for alltoall", "");
457 simgrid::config::declare_flag<std::string>("smpi/alltoallv", "Which collective to use for alltoallv", "");
458 simgrid::config::declare_flag<std::string>("smpi/bcast", "Which collective to use for bcast", "");
459 simgrid::config::declare_flag<std::string>("smpi/reduce", "Which collective to use for reduce", "");
464 simgrid::config::declare_flag<bool>(
465 "exception/cutpath", "Whether to cut all path information from call traces, used e.g. in exceptions.", false);
467 extern bool _sg_do_clean_atexit;
468 simgrid::config::bind_flag(_sg_do_clean_atexit, "clean-atexit", {"clean_atexit"},
469 "Whether to cleanup SimGrid at exit. Disable it if your code segfaults after its end.");
471 if (surf_path.empty())
472 simgrid::config::set_default<std::string>("path", "./");
474 _sg_cfg_init_status = 1;
476 sg_config_cmd_line(argc, argv);
478 xbt_mallocator_initialization_is_done(SIMIX_context_is_parallel());
481 void sg_config_finalize()
483 simgrid::config::finalize();
484 _sg_cfg_init_status = 0;