1 /* Copyright (c) 2009-2022. 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/instr.h>
9 #include <simgrid/version.h>
10 #include <xbt/config.hpp>
12 #include "simgrid/sg_config.hpp"
13 #include "src/instr/instr_private.hpp"
14 #include "src/internal_config.h"
15 #include "src/kernel/context/Context.hpp"
16 #include "src/kernel/lmm/maxmin.hpp"
17 #include "src/mc/mc_config.hpp"
18 #include "src/mc/mc_replay.hpp"
19 #include "src/smpi/include/smpi_config.hpp"
20 #include "src/surf/surf_interface.hpp"
22 #include <string_view>
24 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_config, surf, "About the configuration of SimGrid");
26 static simgrid::config::Flag<bool> cfg_continue_after_help
27 {"help-nostop", "Do not stop the execution when --help is found", false};
29 /** @brief Allow other libraries to react to the --help flag, too
31 * When finding --help on the command line, simgrid usually stops right after displaying its help message.
32 * If you are writing a library using simgrid, you may want to display your own help message before everything stops.
33 * If so, just call this function before having simgrid parsing the command line, and you will be given the control
34 * even if the user is asking for help.
36 void sg_config_continue_after_help()
38 cfg_continue_after_help = true;
41 /* 0: beginning of time (config cannot be changed yet)
42 * 1: initialized: cfg_set created (config can now be changed)
43 * 2: configured: command line parsed and config part of platform file was
44 * integrated also, platform construction ongoing or done.
45 * (Config cannot be changed anymore!)
47 int _sg_cfg_init_status = 0;
49 /* Parse the command line, looking for options */
50 static void sg_config_cmd_line(int *argc, char **argv)
52 bool shall_exit = false;
53 bool parse_args = true; // Stop parsing the parameters once we found '--'
56 for (int i = j; i < *argc; i++) {
57 if (not strcmp("--", argv[i])) {
59 // Remove that '--' from the arguments
60 } else if (parse_args && not strncmp(argv[i], "--cfg=", strlen("--cfg="))) {
61 char *opt = strchr(argv[i], '=');
64 simgrid::config::set_parse(opt);
65 XBT_DEBUG("Did apply '%s' as config setting", opt);
66 } else if (parse_args && not strcmp(argv[i], "--version")) {
69 } else if (parse_args && (not strcmp(argv[i], "--cfg-help") || not strcmp(argv[i], "--help"))) {
70 XBT_HELP("Description of the configuration accepted by this simulator:");
71 simgrid::config::help();
73 "Each of these configurations can be used by adding\n"
74 " --cfg=<option name>:<option value>\n"
75 "to the command line. Try passing \"help\" as a value\n"
76 "to get the list of values accepted by a given option.\n"
77 "For example, \"--cfg=plugin:help\" gives you the list of\n"
78 "plugins available in your installation of SimGrid.\n"
80 "For more information, please refer to:\n"
81 " --help-aliases for the list of all option aliases.\n"
82 " --help-logs and --help-log-categories for the details of logging output.\n"
83 " --help-models for a list of all models known by this simulator.\n"
84 " --help-tracing for the details of all tracing options known by this simulator.\n"
85 " --version to get SimGrid version information.\n");
86 shall_exit = not cfg_continue_after_help;
87 argv[j++] = argv[i]; // Preserve the --help in argv just in case someone else wants to see it
88 } else if (parse_args && not strcmp(argv[i], "--help-aliases")) {
89 XBT_HELP("Here is a list of all deprecated option names, with their replacement.");
90 simgrid::config::show_aliases();
91 XBT_HELP("Please consider using the recent names");
93 } else if (parse_args && not strcmp(argv[i], "--help-models")) {
94 model_help("host", surf_host_model_description);
96 model_help("CPU", surf_cpu_model_description);
98 model_help("network", surf_network_model_description);
99 XBT_HELP("\nLong description of all optimization levels accepted by the models of this simulator:");
100 for (auto const& item : surf_optimization_mode_description)
101 XBT_HELP(" %s: %s", item.name, item.description);
102 XBT_HELP("Both network and CPU models have 'Lazy' as default optimization level\n");
104 } else if (parse_args && not strcmp(argv[i], "--help-tracing")) {
119 /* callback of the plugin variable */
120 static void _sg_cfg_cb__plugin(const std::string& value)
122 xbt_assert(_sg_cfg_init_status < 2, "Cannot load a plugin after the initialization");
127 if (value == "help") {
128 model_help("plugin", surf_plugin_description());
132 const auto* plugin = find_model_description(surf_plugin_description(), value);
133 plugin->model_init_preparse();
136 /* callback of the host/model variable */
137 static void _sg_cfg_cb__host_model(const std::string& value)
139 xbt_assert(_sg_cfg_init_status < 2, "Cannot change the model after the initialization");
141 if (value == "help") {
142 model_help("host", surf_host_model_description);
146 /* Make sure that the model exists */
147 find_model_description(surf_host_model_description, value);
150 /* callback of the cpu/model variable */
151 static void _sg_cfg_cb__cpu_model(const std::string& value)
153 xbt_assert(_sg_cfg_init_status < 2, "Cannot change the model after the initialization");
155 if (value == "help") {
156 model_help("CPU", surf_cpu_model_description);
160 /* New Module missing */
161 find_model_description(surf_cpu_model_description, value);
164 /* callback of the cpu/model variable */
165 static void _sg_cfg_cb__optimization_mode(const std::string& value)
167 xbt_assert(_sg_cfg_init_status < 2, "Cannot change the model after the initialization");
169 if (value == "help") {
170 model_help("optimization", surf_optimization_mode_description);
174 /* New Module missing */
175 find_model_description(surf_optimization_mode_description, value);
178 static void _sg_cfg_cb__disk_model(const std::string& value)
180 xbt_assert(_sg_cfg_init_status < 2, "Cannot change the model after the initialization");
182 if (value == "help") {
183 model_help("disk", surf_disk_model_description);
187 find_model_description(surf_disk_model_description, value);
190 /* callback of the network_model variable */
191 static void _sg_cfg_cb__network_model(const std::string& value)
193 xbt_assert(_sg_cfg_init_status < 2, "Cannot change the model after the initialization");
195 if (value == "help") {
196 model_help("network", surf_network_model_description);
200 /* New Module missing */
201 find_model_description(surf_network_model_description, value);
204 static void _sg_cfg_cb_contexts_parallel_mode(std::string_view mode_name)
206 if (mode_name == "posix") {
207 simgrid::kernel::context::set_parallel_mode(XBT_PARMAP_POSIX);
208 } else if (mode_name == "futex") {
209 simgrid::kernel::context::set_parallel_mode(XBT_PARMAP_FUTEX);
210 } else if (mode_name == "busy_wait") {
211 simgrid::kernel::context::set_parallel_mode(XBT_PARMAP_BUSY_WAIT);
213 xbt_die("Command line setting of the parallel synchronization mode should "
214 "be one of \"posix\", \"futex\" or \"busy_wait\"");
218 /* build description line with possible values */
219 static void declare_model_flag(const std::string& name, const std::string& value,
220 const std::function<void(std::string const&)>& callback,
221 const std::vector<surf_model_description_t>& model_description, const std::string& type,
222 const std::string& descr)
224 std::string description = descr + ". Possible values: ";
225 std::string sep = "";
226 for (auto const& item : model_description) {
227 description += sep + item.name;
230 description += ".\n (use 'help' as a value to see the long description of each " + type + ")";
231 simgrid::config::declare_flag<std::string>(name, description, value, callback);
234 /* create the config set, register what should be and parse the command line*/
235 void sg_config_init(int *argc, char **argv)
237 /* Create the configuration support */
238 if (_sg_cfg_init_status != 0) { /* Only create stuff if not already inited */
239 XBT_WARN("Call to sg_config_init() after initialization ignored");
243 /* Plugins configuration */
244 declare_model_flag("plugin", "", &_sg_cfg_cb__plugin, surf_plugin_description(), "plugin", "The plugins");
246 declare_model_flag("cpu/model", "Cas01", &_sg_cfg_cb__cpu_model, surf_cpu_model_description, "model",
247 "The model to use for the CPU");
249 declare_model_flag("disk/model", "default", &_sg_cfg_cb__disk_model, surf_disk_model_description, "model",
250 "The model to use for the disk");
252 declare_model_flag("network/model", "LV08", &_sg_cfg_cb__network_model, surf_network_model_description, "model",
253 "The model to use for the network");
255 declare_model_flag("network/optim", "Lazy", &_sg_cfg_cb__optimization_mode, surf_optimization_mode_description,
256 "optimization mode", "The optimization modes to use for the network");
258 declare_model_flag("host/model", "default", &_sg_cfg_cb__host_model, surf_host_model_description, "model",
259 "The model to use for the host");
261 simgrid::config::bind_flag(sg_surf_precision, "surf/precision",
262 "Numerical precision used when updating simulation times (in seconds)");
264 simgrid::config::bind_flag(sg_maxmin_precision, "maxmin/precision",
265 "Numerical precision used when computing resource sharing (in flops/sec or bytes/sec)");
267 simgrid::config::bind_flag(sg_concurrency_limit, "maxmin/concurrency-limit",
268 "Maximum number of concurrent variables in the maxmim system. Also limits the number of "
269 "processes on each host, at higher level. (default: -1 means no such limitation)");
271 /* The parameters of network models */
273 sg_latency_factor = 13.01; // comes from the default LV08 network model
274 simgrid::config::bind_flag(sg_latency_factor, "network/latency-factor",
275 "Correction factor to apply to the provided latency (default value set by network model)");
277 sg_bandwidth_factor = 0.97; // comes from the default LV08 network model
278 simgrid::config::bind_flag(
279 sg_bandwidth_factor, "network/bandwidth-factor",
280 "Correction factor to apply to the provided bandwidth (default value set by network model)");
282 sg_weight_S_parameter = 20537; // comes from the default LV08 network model
283 simgrid::config::bind_flag(
284 sg_weight_S_parameter, "network/weight-S",
285 "Correction factor to apply to the weight of competing streams (default value set by network model)");
287 static simgrid::config::Flag<double> _sg_network_loopback_latency{
288 "network/loopback-lat",
289 "For network models with an implicit loopback link (L07, CM02, LV08), "
290 "latency of the loopback link. 0 by default",
293 static simgrid::config::Flag<double> _sg_network_loopback_bandwidth{
294 "network/loopback-bw",
295 "For network models with an implicit loopback link (L07, CM02, LV08), "
296 "bandwidth of the loopback link. 10GBps by default",
300 static simgrid::config::Flag<std::string> cfg_path{
301 "path", "Lookup path for inclusions in platform and deployment XML files", "", [](std::string const& path) {
302 if (not path.empty())
303 surf_path.push_back(path);
306 static simgrid::config::Flag<bool> cfg_cpu_maxmin_selective_update{
307 "cpu/maxmin-selective-update",
308 "Update the constraint set propagating recursively to others constraints "
309 "(off by default unless optim is set to lazy)",
311 static simgrid::config::Flag<bool> cfg_network_maxmin_selective_update{"network/maxmin-selective-update",
312 "Update the constraint set propagating "
313 "recursively to others constraints (off by "
314 "default unless optim is set to lazy)",
317 static simgrid::config::Flag<int> cfg_context_stack_size{
318 "contexts/stack-size", "Stack size of contexts in KiB (not with threads)", 8 * 1024,
319 [](int value) { simgrid::kernel::context::stack_size = value * 1024; }};
321 /* guard size for contexts stacks in memory pages */
322 #if defined(_WIN32) || (PTH_STACKGROWTH != -1)
323 int default_guard_size = 0;
325 int default_guard_size = 1;
327 static simgrid::config::Flag<int> cfg_context_guard_size{
328 "contexts/guard-size", "Guard size for contexts stacks in memory pages", default_guard_size,
329 [](int value) { simgrid::kernel::context::guard_size = value * xbt_pagesize; }};
330 static simgrid::config::Flag<int> cfg_context_nthreads{"contexts/nthreads",
331 "Number of parallel threads used to execute user contexts", 1,
332 &simgrid::kernel::context::set_nthreads};
334 /* synchronization mode for parallel user contexts */
336 std::string default_synchro_mode = "futex";
337 #else // No futex on mac and posix is unimplemented yet
338 std::string default_synchro_mode = "busy_wait";
340 static simgrid::config::Flag<std::string> cfg_context_synchro{"contexts/synchro",
341 "Synchronization mode to use when running contexts in "
342 "parallel (either futex, posix or busy_wait)",
343 default_synchro_mode,
344 &_sg_cfg_cb_contexts_parallel_mode};
346 // For smpi/bw-factor and smpi/lat-factor
347 // SMPI model can be used without enable_smpi, so keep this out of the ifdef.
348 simgrid::config::declare_flag<std::string>("smpi/bw-factor",
349 "Bandwidth factors for smpi. Format: "
350 "'threshold0:value0;threshold1:value1;...;thresholdN:valueN', "
351 "meaning if(size >=thresholdN ) return valueN.",
352 "65472:0.940694;15424:0.697866;9376:0.58729;5776:1.08739;3484:0.77493;"
353 "1426:0.608902;732:0.341987;257:0.338112;0:0.812084");
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 static simgrid::config::Flag<std::string> cfg_smpi_IB_penalty_factors{
359 "smpi/IB-penalty-factors",
360 "Correction factor to communications using Infiniband model with "
361 "contention (default value based on Stampede cluster profiling)",
365 static simgrid::config::Flag<bool> cfg_execution_cutpath{
366 "exception/cutpath", "Whether to cut all path information from call traces, used e.g. in exceptions.", false};
368 if (surf_path.empty())
369 simgrid::config::set_default<std::string>("path", "./");
371 _sg_cfg_init_status = 1;
373 sg_config_cmd_line(argc, argv);
375 xbt_mallocator_initialization_is_done(simgrid::kernel::context::is_parallel());
378 void sg_config_finalize()
380 simgrid::config::finalize();
381 _sg_cfg_init_status = 0;