1 /* Copyright (c) 2007-2015. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
8 #include "src/portable.h"
10 #include "src/surf/surf_interface.hpp"
11 #include "src/surf/storage_interface.hpp"
12 #include "src/surf/xml/platf.hpp"
13 #include "smx_private.h"
14 #include "smx_private.hpp"
16 #include "xbt/ex.h" /* ex_backtrace_display */
18 #include "src/mc/mc_replay.h"
19 #include "simgrid/sg_config.h"
22 #include "src/mc/mc_private.h"
23 #include "src/mc/mc_protocol.h"
24 #include "src/mc/mc_client.h"
29 #include "src/mc/mc_protocol.h"
32 #include "src/mc/mc_record.h"
35 #include "src/smpi/private.h"
38 XBT_LOG_NEW_CATEGORY(simix, "All SIMIX categories");
39 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_kernel, simix, "Logging specific to SIMIX (kernel)");
41 smx_global_t simix_global = NULL;
42 static xbt_heap_t simix_timers = NULL;
44 /** @brief Timer datatype */
45 typedef struct s_smx_timer {
51 void (*SMPI_switch_data_segment)(int) = NULL;
53 static void* SIMIX_synchro_mallocator_new_f(void);
54 static void SIMIX_synchro_mallocator_free_f(void* synchro);
55 static void SIMIX_synchro_mallocator_reset_f(void* synchro);
57 /* FIXME: Yeah, I'll do it in a portable maner one day [Mt] */
60 int _sg_do_verbose_exit = 1;
61 static void inthandler(int ignored)
63 if ( _sg_do_verbose_exit ) {
64 XBT_INFO("CTRL-C pressed. The current status will be displayed before exit (disable that behavior with option 'verbose-exit').");
65 SIMIX_display_process_status();
68 XBT_INFO("CTRL-C pressed, exiting. Hiding the current process status since 'verbose-exit' is set to false.");
74 static void segvhandler(int signum, siginfo_t *siginfo, void *context)
76 if (siginfo->si_signo == SIGSEGV && siginfo->si_code == SEGV_ACCERR) {
78 "Access violation detected.\n"
79 "This can result from a programming error in your code or, although less likely,\n"
80 "from a bug in SimGrid itself. This can also be the sign of a bug in the OS or\n"
81 "in third-party libraries. Failing hardware can sometimes generate such errors\n"
83 "Finally, if nothing of the above applies, this can result from a stack overflow.\n"
84 "Try to increase stack size with --cfg=contexts/stack_size (current size is %d KiB).\n",
85 smx_context_stack_size / 1024);
86 if (XBT_LOG_ISENABLED(simix_kernel, xbt_log_priority_debug)) {
88 "siginfo = {si_signo = %d, si_errno = %d, si_code = %d, si_addr = %p}\n",
89 siginfo->si_signo, siginfo->si_errno, siginfo->si_code, siginfo->si_addr);
91 } else if (siginfo->si_signo == SIGSEGV) {
92 fprintf(stderr, "Segmentation fault.\n");
94 if (smpi_enabled() && !smpi_privatize_global_variables) {
95 #ifdef HAVE_PRIVATIZATION
97 "Try to enable SMPI variable privatization with --cfg=smpi/privatize_global_variables:yes.\n");
100 "Sadly, your system does not support --cfg=smpi/privatize_global_variables:yes (yet).\n");
101 #endif /* HAVE_PRIVATIZATION */
103 #endif /* HAVE_SMPI */
108 char sigsegv_stack[SIGSTKSZ]; /* alternate stack for SIGSEGV handler */
111 * Install signal handler for SIGSEGV. Check that nobody has already installed
112 * its own handler. For example, the Java VM does this.
114 static void install_segvhandler(void)
116 stack_t stack, old_stack;
117 stack.ss_sp = sigsegv_stack;
118 stack.ss_size = sizeof sigsegv_stack;
121 if (sigaltstack(&stack, &old_stack) == -1) {
122 XBT_WARN("Failed to register alternate signal stack: %s", strerror(errno));
125 if (!(old_stack.ss_flags & SS_DISABLE)) {
126 XBT_DEBUG("An alternate stack was already installed (sp=%p, size=%zd, flags=%x). Restore it.",
127 old_stack.ss_sp, old_stack.ss_size, old_stack.ss_flags);
128 sigaltstack(&old_stack, NULL);
131 struct sigaction action, old_action;
132 action.sa_sigaction = segvhandler;
133 action.sa_flags = SA_ONSTACK | SA_RESETHAND | SA_SIGINFO;
134 sigemptyset(&action.sa_mask);
136 if (sigaction(SIGSEGV, &action, &old_action) == -1) {
137 XBT_WARN("Failed to register signal handler for SIGSEGV: %s", strerror(errno));
140 if ((old_action.sa_flags & SA_SIGINFO) || old_action.sa_handler != SIG_DFL) {
141 XBT_DEBUG("A signal handler was already installed for SIGSEGV (%p). Restore it.",
142 (old_action.sa_flags & SA_SIGINFO) ?
143 (void*)old_action.sa_sigaction : (void*)old_action.sa_handler);
144 sigaction(SIGSEGV, &old_action, NULL);
149 /********************************* SIMIX **************************************/
151 double SIMIX_timer_next(void)
153 return xbt_heap_size(simix_timers) > 0 ? xbt_heap_maxkey(simix_timers) : -1.0;
156 static void kill_process(smx_process_t process)
158 SIMIX_process_kill(process, NULL);
161 static void SIMIX_storage_create_(smx_storage_t storage)
163 const char* key = xbt_dict_get_elm_key(storage);
164 SIMIX_storage_create(key, storage, NULL);
167 static std::function<void()> maestro_code;
172 XBT_PUBLIC(void) set_maestro(std::function<void()> code)
174 maestro_code = std::move(code);
180 void SIMIX_set_maestro(void (*code)(void*), void* data)
182 maestro_code = std::bind(code, data);
187 * \brief Initialize SIMIX internal data.
192 void SIMIX_global_init(int *argc, char **argv)
195 _sg_do_model_check = getenv(MC_ENV_VARIABLE) != NULL;
198 s_smx_process_t proc;
201 simix_global = xbt_new0(s_smx_global_t, 1);
203 #ifdef TIME_BENCH_AMDAHL
204 simix_global->timer_seq = xbt_os_timer_new();
205 simix_global->timer_par = xbt_os_timer_new();
206 xbt_os_cputimer_start(simix_global->timer_seq);
208 simix_global->process_to_run = xbt_dynar_new(sizeof(smx_process_t), NULL);
209 simix_global->process_that_ran = xbt_dynar_new(sizeof(smx_process_t), NULL);
210 simix_global->process_list = xbt_swag_new(xbt_swag_offset(proc, process_hookup));
211 simix_global->process_to_destroy = xbt_swag_new(xbt_swag_offset(proc, destroy_hookup));
213 simix_global->maestro_process = NULL;
214 simix_global->registered_functions = xbt_dict_new_homogeneous(NULL);
216 simix_global->create_process_function = SIMIX_process_create;
217 simix_global->kill_process_function = kill_process;
218 simix_global->cleanup_process_function = SIMIX_process_cleanup;
219 simix_global->synchro_mallocator = xbt_mallocator_new(65536,
220 SIMIX_synchro_mallocator_new_f, SIMIX_synchro_mallocator_free_f,
221 SIMIX_synchro_mallocator_reset_f);
222 simix_global->mutex = xbt_os_mutex_init();
224 surf_init(argc, argv); /* Initialize SURF structures */
225 SIMIX_context_mod_init();
227 // Either create a new context with maestro or create
228 // a context object with the current context mestro):
229 simgrid::simix::create_maestro(maestro_code);
231 /* context exception handlers */
232 __xbt_running_ctx_fetch = SIMIX_process_get_running_context;
233 __xbt_ex_terminate = SIMIX_process_exception_terminate;
235 SIMIX_network_init();
237 /* Prepare to display some more info when dying on Ctrl-C pressing */
238 signal(SIGINT, inthandler);
241 install_segvhandler();
243 /* register a function to be called by SURF after the environment creation */
245 simgrid::surf::on_postparse.connect(SIMIX_post_create_environment);
246 simgrid::s4u::Host::onCreation.connect([](simgrid::s4u::Host& host) {
247 SIMIX_host_create(&host);
249 SIMIX_HOST_LEVEL = simgrid::s4u::Host::extension_create(SIMIX_host_destroy);
251 simgrid::surf::storageCreatedCallbacks.connect([](simgrid::surf::Storage* storage) {
252 const char* id = storage->getName();
253 // TODO, create sg_storage_by_name
254 sg_storage_t s = xbt_lib_get_elm_or_null(storage_lib, id);
255 xbt_assert(s != NULL, "Storage not found for name %s", id);
256 SIMIX_storage_create_(s);
259 SIMIX_STORAGE_LEVEL = xbt_lib_add_level(storage_lib, SIMIX_storage_destroy);
262 simix_timers = xbt_heap_new(8, &free);
265 if (sg_cfg_get_boolean("clean_atexit"))
269 // The communication initialization is done ASAP.
270 // We need to communicate initialization of the different layers to the model-checker.
274 if (_sg_cfg_exit_asap)
281 * \brief Clean the SIMIX simulation
283 * This functions remove the memory used by SIMIX
285 void SIMIX_clean(void)
287 #ifdef TIME_BENCH_PER_SR
288 smx_ctx_raw_new_sr();
290 if (smx_cleaned) return; // to avoid double cleaning by java and C
292 XBT_DEBUG("SIMIX_clean called. Simulation's over.");
293 if (!xbt_dynar_is_empty(simix_global->process_to_run) && SIMIX_get_clock() == 0.0) {
295 XBT_CRITICAL("The time is still 0, and you still have processes ready to run.");
296 XBT_CRITICAL("It seems that you forgot to run the simulation that you setup.");
297 xbt_die("Bailing out to avoid that stop-before-start madness. Please fix your code.");
299 /* Kill all processes (but maestro) */
300 SIMIX_process_killall(simix_global->maestro_process, 1);
302 /* Exit the SIMIX network module */
303 SIMIX_network_exit();
305 xbt_heap_free(simix_timers);
307 /* Free the remaining data structures */
308 xbt_dynar_free(&simix_global->process_to_run);
309 xbt_dynar_free(&simix_global->process_that_ran);
310 xbt_swag_free(simix_global->process_to_destroy);
311 xbt_swag_free(simix_global->process_list);
312 simix_global->process_list = NULL;
313 simix_global->process_to_destroy = NULL;
314 xbt_dict_free(&(simix_global->registered_functions));
316 xbt_os_mutex_destroy(simix_global->mutex);
317 simix_global->mutex = NULL;
319 /* Let's free maestro now */
320 SIMIX_context_free(simix_global->maestro_process->context);
321 xbt_free(simix_global->maestro_process->running_ctx);
322 xbt_free(simix_global->maestro_process);
323 simix_global->maestro_process = NULL;
325 /* Restore the default exception setup */
326 __xbt_running_ctx_fetch = &__xbt_ex_ctx_default;
327 __xbt_ex_terminate = &__xbt_ex_terminate_default;
329 /* Finish context module and SURF */
330 SIMIX_context_mod_exit();
334 #ifdef TIME_BENCH_AMDAHL
335 xbt_os_cputimer_stop(simix_global->timer_seq);
336 XBT_INFO("Amdahl timing informations. Sequential time: %f; Parallel time: %f",
337 xbt_os_timer_elapsed(simix_global->timer_seq),
338 xbt_os_timer_elapsed(simix_global->timer_par));
339 xbt_os_timer_free(simix_global->timer_seq);
340 xbt_os_timer_free(simix_global->timer_par);
343 xbt_mallocator_free(simix_global->synchro_mallocator);
344 xbt_free(simix_global);
353 * \brief A clock (in second).
355 * \return Return the clock.
357 double SIMIX_get_clock(void)
359 if(MC_is_active() || MC_record_replay_is_active()){
360 return MC_process_clock_get(SIMIX_process_self());
362 return surf_get_clock();
366 static int process_syscall_color(void *p)
368 switch ((*(smx_process_t *)p)->simcall.call) {
370 case SIMCALL_PROCESS_KILL:
372 case SIMCALL_PROCESS_RESUME:
381 * \brief Run the main simulation loop.
386 MC_record_replay_init();
387 MC_record_replay_from_string(MC_record_path);
392 smx_process_t process;
393 surf_action_t action;
399 XBT_DEBUG("New Schedule Round; size(queue)=%lu",
400 xbt_dynar_length(simix_global->process_to_run));
401 #ifdef TIME_BENCH_PER_SR
402 smx_ctx_raw_new_sr();
404 while (!xbt_dynar_is_empty(simix_global->process_to_run)) {
405 XBT_DEBUG("New Sub-Schedule Round; size(queue)=%lu",
406 xbt_dynar_length(simix_global->process_to_run));
408 /* Run all processes that are ready to run, possibly in parallel */
409 #ifdef TIME_BENCH_AMDAHL
410 xbt_os_cputimer_stop(simix_global->timer_seq);
411 xbt_os_cputimer_resume(simix_global->timer_par);
413 SIMIX_process_runall();
414 #ifdef TIME_BENCH_AMDAHL
415 xbt_os_cputimer_stop(simix_global->timer_par);
416 xbt_os_cputimer_resume(simix_global->timer_seq);
419 /* Move all killer processes to the end of the list, because killing a process that have an ongoing simcall is a bad idea */
420 xbt_dynar_three_way_partition(simix_global->process_that_ran, process_syscall_color);
422 /* answer sequentially and in a fixed arbitrary order all the simcalls that were issued during that sub-round */
424 /* WARNING, the order *must* be fixed or you'll jeopardize the simulation reproducibility (see RR-7653) */
426 /* Here, the order is ok because:
428 * Short proof: only maestro adds stuff to the process_to_run array, so the execution order of user contexts do not impact its order.
430 * Long proof: processes remain sorted through an arbitrary (implicit, complex but fixed) order in all cases.
432 * - if there is no kill during the simulation, processes remain sorted according by their PID.
433 * rational: This can be proved inductively.
434 * Assume that process_to_run is sorted at a beginning of one round (it is at round 0: the deployment file is parsed linearly).
435 * Let's show that it is still so at the end of this round.
436 * - if a process is added when being created, that's from maestro. It can be either at startup
437 * time (and then in PID order), or in response to a process_create simcall. Since simcalls are handled
438 * in arbitrary order (inductive hypothesis), we are fine.
439 * - If a process is added because it's getting killed, its subsequent actions shouldn't matter
440 * - If a process gets added to process_to_run because one of their blocking action constituting the meat
441 * of a simcall terminates, we're still good. Proof:
442 * - You are added from SIMIX_simcall_answer() only. When this function is called depends on the resource
443 * kind (network, cpu, disk, whatever), but the same arguments hold. Let's take communications as an example.
444 * - For communications, this function is called from SIMIX_comm_finish().
445 * This function itself don't mess with the order since simcalls are handled in FIFO order.
446 * The function is called:
447 * - before the comm starts (invalid parameters, or resource already dead or whatever).
448 * The order then trivial holds since maestro didn't interrupt its handling of the simcall yet
449 * - because the communication failed or were canceled after startup. In this case, it's called from the function
450 * we are in, by the chunk:
451 * set = model->states.failed_action_set;
452 * while ((synchro = xbt_swag_extract(set)))
453 * SIMIX_simcall_post((smx_synchro_t) synchro->data);
454 * This order is also fixed because it depends of the order in which the surf actions were
455 * added to the system, and only maestro can add stuff this way, through simcalls.
456 * We thus use the inductive hypothesis once again to conclude that the order in which synchros are
457 * poped out of the swag does not depend on the user code's execution order.
458 * - because the communication terminated. In this case, synchros are served in the order given by
459 * set = model->states.done_action_set;
460 * while ((synchro = xbt_swag_extract(set)))
461 * SIMIX_simcall_post((smx_synchro_t) synchro->data);
462 * and the argument is very similar to the previous one.
463 * So, in any case, the orders of calls to SIMIX_comm_finish() do not depend on the order in which user processes are executed.
464 * So, in any cases, the orders of processes within process_to_run do not depend on the order in which user processes were executed previously.
465 * So, if there is no killing in the simulation, the simulation reproducibility is not jeopardized.
466 * - If there is some process killings, the order is changed by this decision that comes from user-land
467 * But this decision may not have been motivated by a situation that were different because the simulation is not reproducible.
468 * So, even the order change induced by the process killing is perfectly reproducible.
470 * So science works, bitches [http://xkcd.com/54/].
472 * We could sort the process_that_ran array completely so that we can describe the order in which simcalls are handled
473 * (like "according to the PID of issuer"), but it's not mandatory (order is fixed already even if unfriendly).
474 * That would thus be a pure waste of time.
477 xbt_dynar_foreach(simix_global->process_that_ran, iter, process) {
478 if (process->simcall.call != SIMCALL_NONE) {
479 SIMIX_simcall_handle(&process->simcall, 0);
482 /* Wake up all processes waiting for a Surf action to finish */
483 xbt_dynar_foreach(all_existing_models, iter, model) {
484 XBT_DEBUG("Handling process whose action failed");
485 while ((action = surf_model_extract_failed_action_set(model))) {
486 XBT_DEBUG(" Handling Action %p",action);
487 SIMIX_simcall_exit((smx_synchro_t) action->getData());
489 XBT_DEBUG("Handling process whose action terminated normally");
490 while ((action = surf_model_extract_done_action_set(model))) {
491 XBT_DEBUG(" Handling Action %p",action);
492 if (action->getData() == NULL)
493 XBT_DEBUG("probably vcpu's action %p, skip", action);
495 SIMIX_simcall_exit((smx_synchro_t) action->getData());
500 time = SIMIX_timer_next();
501 if (time != -1.0 || xbt_swag_size(simix_global->process_list) != 0) {
502 XBT_DEBUG("Calling surf_solve");
503 time = surf_solve(time);
504 XBT_DEBUG("Moving time ahead : %g", time);
506 /* Notify all the hosts that have failed */
507 /* FIXME: iterate through the list of failed host and mark each of them */
508 /* as failed. On each host, signal all the running processes with host_fail */
510 /* Handle any pending timer */
511 while (xbt_heap_size(simix_timers) > 0 && SIMIX_get_clock() >= SIMIX_timer_next()) {
512 //FIXME: make the timers being real callbacks
513 // (i.e. provide dispatchers that read and expand the args)
514 timer = (smx_timer_t) xbt_heap_pop(simix_timers);
516 timer->func(timer->args);
520 /* Wake up all processes waiting for a Surf action to finish */
521 xbt_dynar_foreach(all_existing_models, iter, model) {
522 XBT_DEBUG("Handling process whose action failed");
523 while ((action = surf_model_extract_failed_action_set(model))) {
524 XBT_DEBUG(" Handling Action %p",action);
525 SIMIX_simcall_exit((smx_synchro_t) action->getData());
527 XBT_DEBUG("Handling process whose action terminated normally");
528 while ((action = surf_model_extract_done_action_set(model))) {
529 XBT_DEBUG(" Handling Action %p",action);
530 if (action->getData() == NULL)
531 XBT_DEBUG("probably vcpu's action %p, skip", action);
533 SIMIX_simcall_exit((smx_synchro_t) action->getData());
537 /* Autorestart all process */
538 char *hostname = NULL;
539 xbt_dynar_foreach(host_that_restart,iter,hostname) {
540 XBT_INFO("Restart processes on host: %s",hostname);
541 SIMIX_host_autorestart(sg_host_by_name(hostname));
543 xbt_dynar_reset(host_that_restart);
545 /* Clean processes to destroy */
546 SIMIX_process_empty_trash();
549 XBT_DEBUG("### time %f, empty %d", time, xbt_dynar_is_empty(simix_global->process_to_run));
551 } while (time != -1.0 || !xbt_dynar_is_empty(simix_global->process_to_run));
553 if (xbt_swag_size(simix_global->process_list) != 0) {
557 XBT_CRITICAL("Oops ! Deadlock or code not perfectly clean.");
558 SIMIX_display_process_status();
564 * \brief Set the date to execute a function
566 * Set the date to execute the function on the surf.
567 * \param date Date to execute function
568 * \param function Function to be executed
569 * \param arg Parameters of the function
572 smx_timer_t SIMIX_timer_set(double date, void (*function)(void*), void *arg)
574 smx_timer_t timer = xbt_new0(s_smx_timer_t, 1);
577 timer->func = function;
579 xbt_heap_push(simix_timers, timer, date);
582 /** @brief cancels a timer that was added earlier */
583 void SIMIX_timer_remove(smx_timer_t timer) {
584 xbt_heap_rm_elm(simix_timers, timer, timer->date);
587 /** @brief Returns the date at which the timer will trigger (or 0 if NULL timer) */
588 double SIMIX_timer_get_date(smx_timer_t timer) {
589 return timer?timer->date:0;
593 * \brief Registers a function to create a process.
595 * This function registers a function to be called
596 * when a new process is created. The function has
597 * to call SIMIX_process_create().
598 * \param function create process function
600 void SIMIX_function_register_process_create(smx_creation_func_t
603 simix_global->create_process_function = function;
607 * \brief Registers a function to kill a process.
609 * This function registers a function to be called when a
610 * process is killed. The function has to call the SIMIX_process_kill().
612 * \param function Kill process function
614 void SIMIX_function_register_process_kill(void_pfn_smxprocess_t
617 simix_global->kill_process_function = function;
621 * \brief Registers a function to cleanup a process.
623 * This function registers a user function to be called when
624 * a process ends properly.
626 * \param function cleanup process function
628 void SIMIX_function_register_process_cleanup(void_pfn_smxprocess_t
631 simix_global->cleanup_process_function = function;
635 void SIMIX_display_process_status(void)
637 if (simix_global->process_list == NULL) {
641 smx_process_t process = NULL;
642 int nbprocess = xbt_swag_size(simix_global->process_list);
644 XBT_INFO("%d processes are still running, waiting for something.", nbprocess);
645 /* List the process and their state */
647 ("Legend of the following listing: \"Process <pid> (<name>@<host>): <status>\"");
648 xbt_swag_foreach(process, simix_global->process_list) {
650 if (process->waiting_synchro) {
652 const char* synchro_description = "unknown";
653 switch (process->waiting_synchro->type) {
655 case SIMIX_SYNC_EXECUTE:
656 synchro_description = "execution";
659 case SIMIX_SYNC_PARALLEL_EXECUTE:
660 synchro_description = "parallel execution";
663 case SIMIX_SYNC_COMMUNICATE:
664 synchro_description = "communication";
667 case SIMIX_SYNC_SLEEP:
668 synchro_description = "sleeping";
671 case SIMIX_SYNC_JOIN:
672 synchro_description = "joining";
675 case SIMIX_SYNC_SYNCHRO:
676 synchro_description = "synchronization";
680 synchro_description = "I/O";
683 XBT_INFO("Process %lu (%s@%s): waiting for %s synchro %p (%s) in state %d to finish",
684 process->pid, process->name, sg_host_get_name(process->host),
685 synchro_description, process->waiting_synchro,
686 process->waiting_synchro->name, (int)process->waiting_synchro->state);
689 XBT_INFO("Process %lu (%s@%s)", process->pid, process->name, sg_host_get_name(process->host));
694 static void* SIMIX_synchro_mallocator_new_f(void) {
695 smx_synchro_t synchro = xbt_new(s_smx_synchro_t, 1);
696 synchro->simcalls = xbt_fifo_new();
700 static void SIMIX_synchro_mallocator_free_f(void* synchro) {
701 xbt_fifo_free(((smx_synchro_t) synchro)->simcalls);
705 static void SIMIX_synchro_mallocator_reset_f(void* synchro) {
707 // we also recycle the simcall list
708 xbt_fifo_t fifo = ((smx_synchro_t) synchro)->simcalls;
709 xbt_fifo_reset(fifo);
710 memset(synchro, 0, sizeof(s_smx_synchro_t));
711 ((smx_synchro_t) synchro)->simcalls = fifo;
714 xbt_dict_t simcall_HANDLER_asr_get_properties(smx_simcall_t simcall, const char *name){
715 return SIMIX_asr_get_properties(name);
717 xbt_dict_t SIMIX_asr_get_properties(const char *name)
719 return (xbt_dict_t) xbt_lib_get_or_null(as_router_lib, name, ROUTING_PROP_ASR_LEVEL);
722 int SIMIX_is_maestro()
724 return simix_global==NULL /*SimDag*/|| SIMIX_process_self() == simix_global->maestro_process;