1 /* Copyright (c) 2009-2023. 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/include/xbt/mmalloc.h"
14 #include "src/instr/instr_private.hpp"
15 #include "src/internal_config.h"
16 #include "src/kernel/context/Context.hpp"
17 #include "src/kernel/lmm/maxmin.hpp"
18 #include "src/kernel/resource/NetworkModel.hpp"
19 #include "src/mc/mc_config.hpp"
20 #include "src/mc/mc_replay.hpp"
21 #include "src/smpi/include/smpi_config.hpp"
22 #include "src/surf/surf_interface.hpp"
24 #include <string_view>
26 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_config, surf, "About the configuration of SimGrid");
28 static simgrid::config::Flag<bool> cfg_continue_after_help
29 {"help-nostop", "Do not stop the execution when --help is found", false};
31 /** @brief Allow other libraries to react to the --help flag, too
33 * When finding --help on the command line, simgrid usually stops right after displaying its help message.
34 * If you are writing a library using simgrid, you may want to display your own help message before everything stops.
35 * If so, just call this function before having simgrid parsing the command line, and you will be given the control
36 * even if the user is asking for help.
38 void sg_config_continue_after_help()
40 cfg_continue_after_help = true;
43 /* 0: beginning of time (config cannot be changed yet)
44 * 1: initialized: cfg_set created (config can now be changed)
45 * 2: configured: command line parsed and config part of platform file was
46 * integrated also, platform construction ongoing or done.
47 * (Config cannot be changed anymore!)
49 int _sg_cfg_init_status = 0;
51 /* Parse the command line, looking for options */
52 static void sg_config_cmd_line(int *argc, char **argv)
54 bool shall_exit = false;
55 bool parse_args = true; // Stop parsing the parameters once we found '--'
58 for (int i = j; i < *argc; i++) {
59 if (not strcmp("--", argv[i])) {
61 // Remove that '--' from the arguments
62 } else if (parse_args && not strncmp(argv[i], "--cfg=", strlen("--cfg="))) {
63 char *opt = strchr(argv[i], '=');
66 simgrid::config::set_parse(opt);
67 XBT_DEBUG("Did apply '%s' as config setting", opt);
68 } else if (parse_args && not strcmp(argv[i], "--version")) {
71 } else if (parse_args && (not strcmp(argv[i], "--cfg-help") || not strcmp(argv[i], "--help"))) {
72 XBT_HELP("Description of the configuration accepted by this simulator:");
73 simgrid::config::help();
75 "Each of these configurations can be used by adding\n"
76 " --cfg=<option name>:<option value>\n"
77 "to the command line. Try passing \"help\" as a value\n"
78 "to get the list of values accepted by a given option.\n"
79 "For example, \"--cfg=plugin:help\" gives you the list of\n"
80 "plugins available in your installation of SimGrid.\n"
82 "For more information, please refer to:\n"
83 " --help-aliases for the list of all option aliases.\n"
84 " --help-logs and --help-log-categories for the details of logging output.\n"
85 " --help-models for a list of all models known by this simulator.\n"
86 " --help-tracing for the details of all tracing options known by this simulator.\n"
87 " --version to get SimGrid version information.\n");
88 shall_exit = not cfg_continue_after_help;
89 argv[j++] = argv[i]; // Preserve the --help in argv just in case someone else wants to see it
90 } else if (parse_args && not strcmp(argv[i], "--help-aliases")) {
91 XBT_HELP("Here is a list of all deprecated option names, with their replacement.");
92 simgrid::config::show_aliases();
93 XBT_HELP("Please consider using the recent names");
95 } else if (parse_args && not strcmp(argv[i], "--help-models")) {
96 model_help("host", surf_host_model_description);
98 model_help("CPU", surf_cpu_model_description);
100 model_help("network", surf_network_model_description);
101 XBT_HELP("\nLong description of all optimization levels accepted by the models of this simulator:");
102 for (auto const& item : surf_optimization_mode_description)
103 XBT_HELP(" %s: %s", item.name, item.description);
104 XBT_HELP("Both network and CPU models have 'Lazy' as default optimization level\n");
106 } else if (parse_args && not strcmp(argv[i], "--help-tracing")) {
121 /* callback of the plugin variable */
122 static void _sg_cfg_cb__plugin(const std::string& value)
124 xbt_assert(_sg_cfg_init_status < 2, "Cannot load a plugin after the initialization");
129 if (value == "help") {
130 model_help("plugin", surf_plugin_description());
134 const auto* plugin = find_model_description(surf_plugin_description(), value);
135 plugin->model_init_preparse();
138 /* callback of the host/model variable */
139 static void _sg_cfg_cb__host_model(const std::string& value)
141 xbt_assert(_sg_cfg_init_status < 2, "Cannot change the model after the initialization");
143 if (value == "help") {
144 model_help("host", surf_host_model_description);
148 /* Make sure that the model exists */
149 find_model_description(surf_host_model_description, value);
152 /* callback of the cpu/model variable */
153 static void _sg_cfg_cb__cpu_model(const std::string& value)
155 xbt_assert(_sg_cfg_init_status < 2, "Cannot change the model after the initialization");
157 if (value == "help") {
158 model_help("CPU", surf_cpu_model_description);
162 /* New Module missing */
163 find_model_description(surf_cpu_model_description, value);
166 /* callback of the cpu/model variable */
167 static void _sg_cfg_cb__optimization_mode(const std::string& value)
169 xbt_assert(_sg_cfg_init_status < 2, "Cannot change the model after the initialization");
171 if (value == "help") {
172 model_help("optimization", surf_optimization_mode_description);
176 /* New Module missing */
177 find_model_description(surf_optimization_mode_description, value);
180 static void _sg_cfg_cb__disk_model(const std::string& value)
182 xbt_assert(_sg_cfg_init_status < 2, "Cannot change the model after the initialization");
184 if (value == "help") {
185 model_help("disk", surf_disk_model_description);
189 find_model_description(surf_disk_model_description, value);
192 /* callback of the network_model variable */
193 static void _sg_cfg_cb__network_model(const std::string& value)
195 xbt_assert(_sg_cfg_init_status < 2, "Cannot change the model after the initialization");
197 if (value == "help") {
198 model_help("network", surf_network_model_description);
202 /* New Module missing */
203 find_model_description(surf_network_model_description, value);
206 static void _sg_cfg_cb_contexts_parallel_mode(std::string_view mode_name)
208 if (mode_name == "posix") {
209 simgrid::kernel::context::set_parallel_mode(XBT_PARMAP_POSIX);
210 } else if (mode_name == "futex") {
211 simgrid::kernel::context::set_parallel_mode(XBT_PARMAP_FUTEX);
212 } else if (mode_name == "busy_wait") {
213 simgrid::kernel::context::set_parallel_mode(XBT_PARMAP_BUSY_WAIT);
215 xbt_die("Command line setting of the parallel synchronization mode should "
216 "be one of \"posix\", \"futex\" or \"busy_wait\"");
220 /* build description line with possible values */
221 static void declare_model_flag(const std::string& name, const std::string& value,
222 const std::function<void(std::string const&)>& callback,
223 const std::vector<surf_model_description_t>& model_description, const std::string& type,
224 const std::string& descr)
226 std::string description = descr + ". Possible values: ";
227 std::string sep = "";
228 for (auto const& item : model_description) {
229 description += sep + item.name;
232 description += ".\n (use 'help' as a value to see the long description of each " + type + ")";
233 simgrid::config::declare_flag<std::string>(name, description, value, callback);
236 /* create the config set, register what should be and parse the command line*/
237 void sg_config_init(int *argc, char **argv)
239 /* Create the configuration support */
240 if (_sg_cfg_init_status != 0) { /* Only create stuff if not already inited */
241 XBT_WARN("Call to sg_config_init() after initialization ignored");
245 /* Plugins configuration */
246 declare_model_flag("plugin", "", &_sg_cfg_cb__plugin, surf_plugin_description(), "plugin", "The plugins");
248 declare_model_flag("cpu/model", "Cas01", &_sg_cfg_cb__cpu_model, surf_cpu_model_description, "model",
249 "The model to use for the CPU");
251 declare_model_flag("disk/model", "S19", &_sg_cfg_cb__disk_model, surf_disk_model_description, "model",
252 "The model to use for the disk");
254 declare_model_flag("network/model", "LV08", &_sg_cfg_cb__network_model, surf_network_model_description, "model",
255 "The model to use for the network");
257 declare_model_flag("network/optim", "Lazy", &_sg_cfg_cb__optimization_mode, surf_optimization_mode_description,
258 "optimization mode", "The optimization modes to use for the network");
260 declare_model_flag("host/model", "default", &_sg_cfg_cb__host_model, surf_host_model_description, "model",
261 "The model to use for the host");
263 simgrid::config::bind_flag(sg_surf_precision, "surf/precision",
264 "Numerical precision used when updating simulation times (in seconds)");
266 simgrid::config::bind_flag(sg_maxmin_precision, "maxmin/precision",
267 "Numerical precision used when computing resource sharing (in flops/sec or bytes/sec)");
269 simgrid::config::bind_flag(sg_concurrency_limit, "maxmin/concurrency-limit",
270 "Maximum number of concurrent variables in the maxmim system. Also limits the number of "
271 "processes on each host, at higher level. (default: -1 means no such limitation)");
273 /* The parameters of network models */
274 static simgrid::config::Flag<double> _sg_network_loopback_latency{
275 "network/loopback-lat",
276 "For network models with an implicit loopback link (L07, CM02, LV08), "
277 "latency of the loopback link. 0 by default",
280 static simgrid::config::Flag<double> _sg_network_loopback_bandwidth{
281 "network/loopback-bw",
282 "For network models with an implicit loopback link (L07, CM02, LV08), "
283 "bandwidth of the loopback link. 10GBps by default",
287 static simgrid::config::Flag<std::string> cfg_path{
288 "path", "Lookup path for inclusions in platform and deployment XML files", "", [](std::string const& path) {
289 if (not path.empty())
290 surf_path.push_back(path);
293 static simgrid::config::Flag<bool> cfg_cpu_maxmin_selective_update{
294 "cpu/maxmin-selective-update",
295 "Update the constraint set propagating recursively to others constraints "
296 "(off by default unless optim is set to lazy)",
298 static simgrid::config::Flag<bool> cfg_network_maxmin_selective_update{"network/maxmin-selective-update",
299 "Update the constraint set propagating "
300 "recursively to others constraints (off by "
301 "default unless optim is set to lazy)",
304 static simgrid::config::Flag<int> cfg_context_stack_size{
305 "contexts/stack-size", "Stack size of contexts in KiB (not with threads)", 8 * 1024,
306 [](int value) { simgrid::kernel::context::stack_size = value * 1024; }};
308 /* guard size for contexts stacks in memory pages */
309 #if (PTH_STACKGROWTH != -1)
310 int default_guard_size = 0;
312 int default_guard_size = 1;
314 static simgrid::config::Flag<int> cfg_context_guard_size{
315 "contexts/guard-size", "Guard size for contexts stacks in memory pages", default_guard_size,
316 [](int value) { simgrid::kernel::context::guard_size = value * xbt_pagesize; }};
318 static simgrid::config::Flag<int> cfg_context_nthreads{
319 "contexts/nthreads", "Number of parallel threads used to execute user contexts", 1, [](int nthreads) {
322 nthreads == 1 || not malloc_use_mmalloc(),
323 "Parallel simulation is forbidden in the verified program, as there is no protection against race "
324 "conditions in mmalloc itself. Please don't be so greedy and show some mercy for our implementation.");
326 simgrid::kernel::context::set_nthreads(nthreads);
329 /* synchronization mode for parallel user contexts */
331 std::string default_synchro_mode = "futex";
332 #else // No futex on mac and posix is unimplemented yet
333 std::string default_synchro_mode = "busy_wait";
335 static simgrid::config::Flag<std::string> cfg_context_synchro{"contexts/synchro",
336 "Synchronization mode to use when running contexts in "
337 "parallel (either futex, posix or busy_wait)",
338 default_synchro_mode,
339 &_sg_cfg_cb_contexts_parallel_mode};
341 // SMPI model can be used without enable_smpi, so keep this out of the ifdef.
342 static simgrid::config::Flag<std::string> cfg_smpi_IB_penalty_factors{
343 "smpi/IB-penalty-factors",
344 "Correction factor to communications using Infiniband model with "
345 "contention (default value based on Stampede cluster profiling)",
349 static simgrid::config::Flag<bool> cfg_execution_cutpath{
350 "exception/cutpath", "Whether to cut all path information from call traces, used e.g. in exceptions.", false};
352 if (surf_path.empty())
353 simgrid::config::set_default<std::string>("path", "./");
355 _sg_cfg_init_status = 1;
357 sg_config_cmd_line(argc, argv);
359 xbt_mallocator_initialization_is_done(simgrid::kernel::context::is_parallel());
362 void sg_config_finalize()
364 simgrid::config::finalize();
365 _sg_cfg_init_status = 0;