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>
11 #include <xbt/file.hpp>
13 #include "simgrid/sg_config.hpp"
14 #include "src/include/xbt/mmalloc.h"
15 #include "src/instr/instr_private.hpp"
16 #include "src/internal_config.h"
17 #include "src/kernel/context/Context.hpp"
18 #include "src/kernel/lmm/maxmin.hpp"
19 #include "src/kernel/resource/NetworkModel.hpp"
20 #include "src/mc/mc_config.hpp"
21 #include "src/mc/mc_replay.hpp"
22 #include "src/simgrid/module.hpp"
23 #include "src/smpi/include/smpi_config.hpp"
24 #include "src/surf/surf_interface.hpp"
26 #include <string_view>
28 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(config, kernel, "About the configuration of SimGrid");
30 static simgrid::config::Flag<bool> cfg_continue_after_help
31 {"help-nostop", "Do not stop the execution when --help is found", false};
33 /** @brief Allow other libraries to react to the --help flag, too
35 * When finding --help on the command line, simgrid usually stops right after displaying its help message.
36 * If you are writing a library using simgrid, you may want to display your own help message before everything stops.
37 * If so, just call this function before having simgrid parsing the command line, and you will be given the control
38 * even if the user is asking for help.
40 void sg_config_continue_after_help()
42 cfg_continue_after_help = true;
45 /* 0: beginning of time (config cannot be changed yet)
46 * 1: initialized: cfg_set created (config can now be changed)
47 * 2: configured: command line parsed and config part of platform file was
48 * integrated also, platform construction ongoing or done.
49 * (Config cannot be changed anymore!)
51 int _sg_cfg_init_status = 0;
53 /* Parse the command line, looking for options */
54 static void sg_config_cmd_line(int *argc, char **argv)
56 bool shall_exit = false;
57 bool parse_args = true; // Stop parsing the parameters once we found '--'
60 for (int i = j; i < *argc; i++) {
61 if (not strcmp("--", argv[i])) {
63 // Remove that '--' from the arguments
64 } else if (parse_args && not strncmp(argv[i], "--cfg=", strlen("--cfg="))) {
65 char *opt = strchr(argv[i], '=');
68 simgrid::config::set_parse(opt);
69 XBT_DEBUG("Did apply '%s' as config setting", opt);
70 } else if (parse_args && not strcmp(argv[i], "--version")) {
73 } else if (parse_args && (not strcmp(argv[i], "--cfg-help") || not strcmp(argv[i], "--help"))) {
74 XBT_HELP("Description of the configuration accepted by this simulator:");
75 simgrid::config::help();
77 "Each of these configurations can be used by adding\n"
78 " --cfg=<option name>:<option value>\n"
79 "to the command line. Try passing \"help\" as a value\n"
80 "to get the list of values accepted by a given option.\n"
81 "For example, \"--cfg=plugin:help\" gives you the list of\n"
82 "plugins available in your installation of SimGrid.\n"
84 "For more information, please refer to:\n"
85 " --help-aliases for the list of all option aliases.\n"
86 " --help-logs and --help-log-categories for the details of logging output.\n"
87 " --help-models for a list of all models known by this simulator.\n"
88 " --help-tracing for the details of all tracing options known by this simulator.\n"
89 " --version to get SimGrid version information.\n");
90 shall_exit = not cfg_continue_after_help;
91 argv[j++] = argv[i]; // Preserve the --help in argv just in case someone else wants to see it
92 } else if (parse_args && not strcmp(argv[i], "--help-aliases")) {
93 XBT_HELP("Here is a list of all deprecated option names, with their replacement.");
94 simgrid::config::show_aliases();
95 XBT_HELP("Please consider using the recent names");
97 } else if (parse_args && not strcmp(argv[i], "--help-models")) {
98 simgrid_host_models().help();
100 simgrid_cpu_models().help();
102 simgrid_network_models().help();
103 XBT_HELP("\nLong description of all optimization levels accepted by the models of this simulator:");
104 surf_optimization_mode_description.help();
105 XBT_HELP("Both network and CPU models have 'Lazy' as default optimization level\n");
107 } else if (parse_args && not strcmp(argv[i], "--help-tracing")) {
122 /* callback of the cpu/model variable */
123 static void _sg_cfg_cb__optimization_mode(const std::string& value)
125 xbt_assert(_sg_cfg_init_status < 2, "Cannot change the model after the initialization");
127 if (value == "help") {
128 surf_optimization_mode_description.help();
132 /* Make sure that the model exists */
133 surf_optimization_mode_description.by_name(value);
136 static void _sg_cfg_cb_contexts_parallel_mode(std::string_view mode_name)
138 if (mode_name == "posix") {
139 simgrid::kernel::context::Context::parallel_mode = XBT_PARMAP_POSIX;
140 } else if (mode_name == "futex") {
141 simgrid::kernel::context::Context::parallel_mode = XBT_PARMAP_FUTEX;
142 } else if (mode_name == "busy_wait") {
143 simgrid::kernel::context::Context::parallel_mode = XBT_PARMAP_BUSY_WAIT;
145 xbt_die("Command line setting of the parallel synchronization mode should "
146 "be one of \"posix\", \"futex\" or \"busy_wait\"");
150 /* build description line with possible values */
151 static void declare_model_flag(const std::string& name, const std::string& value,
152 const std::function<void(std::string const&)>& callback,
153 const simgrid::ModuleGroup& model_description, const std::string& descr)
155 std::string description = descr + ". Possible values (other compilation flags may activate more " +
156 model_description.get_kind() + "s): " + model_description.existing_values();
157 description += ".\n (use 'help' as a value to see the long description of each one)";
158 simgrid::config::declare_flag<std::string>(name, description, value, callback);
161 /* create the config set, register what should be and parse the command line*/
162 void sg_config_init(int *argc, char **argv)
164 /* Create the configuration support */
165 if (_sg_cfg_init_status != 0) { /* Only create stuff if not already inited */
166 XBT_WARN("Call to sg_config_init() after initialization ignored");
170 /* Plugins configuration */
171 simgrid_plugins().create_flag("plugin", "The plugins", "", true);
172 simgrid_cpu_models().create_flag("cpu/model", "The model to use for the CPU", "Cas01", false);
173 simgrid_network_models().create_flag("network/model", "The model to use for the network", "LV08", false);
174 simgrid_host_models().create_flag("host/model", "The model to use for the host", "default", false);
175 simgrid_disk_models().create_flag("disk/model", "The model to use for the disk", "S19", false);
176 simgrid_create_models(); // KILL ME
178 declare_model_flag("network/optim", "Lazy", &_sg_cfg_cb__optimization_mode, surf_optimization_mode_description,
179 "The optimization modes to use for the network");
181 simgrid::config::bind_flag(sg_surf_precision, "surf/precision",
182 "Numerical precision used when updating simulation times (in seconds)");
184 simgrid::config::bind_flag(sg_maxmin_precision, "maxmin/precision",
185 "Numerical precision used when computing resource sharing (in flops/sec or bytes/sec)");
187 simgrid::config::bind_flag(sg_concurrency_limit, "maxmin/concurrency-limit",
188 "Maximum number of concurrent variables in the maxmim system. Also limits the number of "
189 "processes on each host, at higher level. (default: -1 means no such limitation)");
191 /* The parameters of network models */
192 static simgrid::config::Flag<double> _sg_network_loopback_latency{
193 "network/loopback-lat",
194 "For network models with an implicit loopback link (L07, CM02, LV08), "
195 "latency of the loopback link. 0 by default",
198 static simgrid::config::Flag<double> _sg_network_loopback_bandwidth{
199 "network/loopback-bw",
200 "For network models with an implicit loopback link (L07, CM02, LV08), "
201 "bandwidth of the loopback link. 10GBps by default",
205 static simgrid::config::Flag<std::string> cfg_path{
206 "path", "Lookup path for inclusions in platform and deployment XML files", "./", [](std::string const& path) {
207 if (not path.empty())
208 simgrid::xbt::path_push(path);
211 static simgrid::config::Flag<bool> cfg_cpu_maxmin_selective_update{
212 "cpu/maxmin-selective-update",
213 "Update the constraint set propagating recursively to others constraints "
214 "(off by default unless optim is set to lazy)",
216 static simgrid::config::Flag<bool> cfg_network_maxmin_selective_update{"network/maxmin-selective-update",
217 "Update the constraint set propagating "
218 "recursively to others constraints (off by "
219 "default unless optim is set to lazy)",
222 static simgrid::config::Flag<int> cfg_context_stack_size{
223 "contexts/stack-size", "Stack size of contexts in KiB (not with threads)", 8 * 1024,
224 [](int value) { simgrid::kernel::context::Context::stack_size = value * 1024; }};
226 /* guard size for contexts stacks in memory pages */
227 #if (PTH_STACKGROWTH != -1)
228 int default_guard_size = 0;
230 int default_guard_size = 1;
232 static simgrid::config::Flag<int> cfg_context_guard_size{
233 "contexts/guard-size", "Guard size for contexts stacks in memory pages", default_guard_size,
234 [](int value) { simgrid::kernel::context::Context::guard_size = value * xbt_pagesize; }};
236 static simgrid::config::Flag<int> cfg_context_nthreads{
237 "contexts/nthreads", "Number of parallel threads used to execute user contexts", 1, [](int nthreads) {
240 nthreads == 1 || not malloc_use_mmalloc(),
241 "Parallel simulation is forbidden in the verified program, as there is no protection against race "
242 "conditions in mmalloc itself. Please don't be so greedy and show some mercy for our implementation.");
244 simgrid::kernel::context::Context::set_nthreads(nthreads);
247 /* synchronization mode for parallel user contexts */
249 std::string default_synchro_mode = "futex";
250 #else // No futex on mac and posix is unimplemented yet
251 std::string default_synchro_mode = "busy_wait";
253 static simgrid::config::Flag<std::string> cfg_context_synchro{"contexts/synchro",
254 "Synchronization mode to use when running contexts in "
255 "parallel (either futex, posix or busy_wait)",
256 default_synchro_mode,
257 &_sg_cfg_cb_contexts_parallel_mode};
259 // SMPI model can be used without enable_smpi, so keep this out of the ifdef.
260 static simgrid::config::Flag<std::string> cfg_smpi_IB_penalty_factors{
261 "smpi/IB-penalty-factors",
262 "Correction factor to communications using Infiniband model with "
263 "contention (default value based on Stampede cluster profiling)",
267 static simgrid::config::Flag<bool> cfg_execution_cutpath{
268 "exception/cutpath", "Whether to cut all path information from call traces, used e.g. in exceptions.", false};
270 _sg_cfg_init_status = 1;
272 sg_config_cmd_line(argc, argv);
274 xbt_mallocator_initialization_is_done(simgrid::kernel::context::Context::is_parallel());
277 void sg_config_finalize()
279 simgrid::config::finalize();
280 _sg_cfg_init_status = 0;