-/* Copyright (c) 2007, 2008, 2009, 2010. The SimGrid Team.
+/* Copyright (c) 2007-2014. The SimGrid Team.
* All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
#include "xbt/str.h"
#include "xbt/ex.h" /* ex_backtrace_display */
#include "mc/mc.h"
+#include "simgrid/sg_config.h"
-XBT_LOG_EXTERNAL_CATEGORY(simix);
-XBT_LOG_EXTERNAL_CATEGORY(simix_deployment);
-XBT_LOG_EXTERNAL_CATEGORY(simix_environment);
-XBT_LOG_EXTERNAL_CATEGORY(simix_host);
-XBT_LOG_EXTERNAL_CATEGORY(simix_process);
-XBT_LOG_EXTERNAL_CATEGORY(simix_synchro);
-XBT_LOG_EXTERNAL_CATEGORY(simix_context);
+XBT_LOG_NEW_CATEGORY(simix, "All SIMIX categories");
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_kernel, simix,
"Logging specific to SIMIX (kernel)");
static void SIMIX_action_mallocator_free_f(void* action);
static void SIMIX_action_mallocator_reset_f(void* action);
-extern void smx_ctx_raw_new_sr(void);
-
/* FIXME: Yeah, I'll do it in a portable maner one day [Mt] */
#include <signal.h>
-int _surf_do_verbose_exit = 1;
+int _sg_do_verbose_exit = 1;
static void _XBT_CALL inthandler(int ignored)
{
- if ( _surf_do_verbose_exit ) {
+ if ( _sg_do_verbose_exit ) {
XBT_INFO("CTRL-C pressed. Displaying status and bailing out");
SIMIX_display_process_status();
}
exit(1);
}
+static void _XBT_CALL segvhandler(int signum, siginfo_t *siginfo, void *context)
+{
+ if (siginfo->si_signo == SIGSEGV && siginfo->si_code == SEGV_ACCERR) {
+ fprintf(stderr,
+ "Access violation detected.\n"
+ "This can result from a programming error in your code or, although less likely,\n"
+ "from a bug in SimGrid itself. This can also be the sign of a bug in the OS or\n"
+ "in third-party libraries. Failing hardware can sometimes generate such errors\n"
+ "too.\n"
+ "Finally, if nothing of the above applies, this can result from a stack overflow.\n"
+ "Try to increase stack size with --cfg=contexts/stack_size (current size is %d KiB).\n",
+ smx_context_stack_size / 1024);
+ if (XBT_LOG_ISENABLED(simix_kernel, xbt_log_priority_debug)) {
+ fprintf(stderr,
+ "siginfo = {si_signo = %d, si_errno = %d, si_code = %d, si_addr = %p}\n",
+ siginfo->si_signo, siginfo->si_errno, siginfo->si_code, siginfo->si_addr);
+ }
+ }
+ raise(signum);
+}
+
+char sigsegv_stack[SIGSTKSZ]; /* alternate stack for SIGSEGV handler */
+
+/**
+ * Install signal handler for SIGSEGV. Check that nobody has already installed
+ * its own handler. For example, the Java VM does this.
+ */
+static void install_segvhandler(void)
+{
+ stack_t stack, old_stack;
+ stack.ss_sp = sigsegv_stack;
+ stack.ss_size = sizeof sigsegv_stack;
+ stack.ss_flags = 0;
+
+ if (sigaltstack(&stack, &old_stack) == -1) {
+ XBT_WARN("Failed to register alternate signal stack: %s",
+ strerror(errno));
+ return;
+ }
+ if (!(old_stack.ss_flags & SS_DISABLE)) {
+ XBT_DEBUG("An alternate stack was already installed (sp=%p, size=%zd, flags=%x). Restore it.",
+ old_stack.ss_sp, old_stack.ss_size, old_stack.ss_flags);
+ sigaltstack(&old_stack, NULL);
+ }
+
+ struct sigaction action, old_action;
+ action.sa_sigaction = segvhandler;
+ action.sa_flags = SA_ONSTACK | SA_RESETHAND | SA_SIGINFO;
+ sigemptyset(&action.sa_mask);
+
+ if (sigaction(SIGSEGV, &action, &old_action) == -1) {
+ XBT_WARN("Failed to register signal handler for SIGSEGV: %s",
+ strerror(errno));
+ return;
+ }
+ if ((old_action.sa_flags & SA_SIGINFO) || old_action.sa_handler != SIG_DFL) {
+ XBT_DEBUG("A signal handler was already installed for SIGSEGV (%p). Restore it.",
+ (old_action.sa_flags & SA_SIGINFO) ?
+ (void*)old_action.sa_sigaction : (void*)old_action.sa_handler);
+ sigaction(SIGSEGV, &old_action, NULL);
+ }
+}
+
/********************************* SIMIX **************************************/
XBT_INLINE double SIMIX_timer_next(void)
}
/**
+ * \ingroup SIMIX_API
* \brief Initialize SIMIX internal data.
*
* \param argc Argc
s_smx_process_t proc;
if (!simix_global) {
- /* Connect our log channels: that must be done manually under windows */
- XBT_LOG_CONNECT(simix_deployment, simix);
- XBT_LOG_CONNECT(simix_environment, simix);
- XBT_LOG_CONNECT(simix_host, simix);
- XBT_LOG_CONNECT(simix_kernel, simix);
- XBT_LOG_CONNECT(simix_process, simix);
- XBT_LOG_CONNECT(simix_synchro, simix);
- XBT_LOG_CONNECT(simix_context, simix);
-
simix_global = xbt_new0(s_smx_global_t, 1);
+#ifdef TIME_BENCH_AMDAHL
+ simix_global->timer_seq = xbt_os_timer_new();
+ simix_global->timer_par = xbt_os_timer_new();
+ xbt_os_cputimer_start(simix_global->timer_seq);
+#endif
simix_global->process_to_run = xbt_dynar_new(sizeof(smx_process_t), NULL);
simix_global->process_that_ran = xbt_dynar_new(sizeof(smx_process_t), NULL);
simix_global->process_list =
simix_global->action_mallocator = xbt_mallocator_new(65536,
SIMIX_action_mallocator_new_f, SIMIX_action_mallocator_free_f,
SIMIX_action_mallocator_reset_f);
+ simix_global->autorestart = SIMIX_host_restart_processes;
surf_init(argc, argv); /* Initialize SURF structures */
SIMIX_context_mod_init();
__xbt_running_ctx_fetch = SIMIX_process_get_running_context;
__xbt_ex_terminate = SIMIX_process_exception_terminate;
- /* Initialize the SIMIX network module */
SIMIX_network_init();
/* Prepare to display some more info when dying on Ctrl-C pressing */
signal(SIGINT, inthandler);
+
+ /* Install SEGV handler */
+ install_segvhandler();
+
+ /* register a function to be called by SURF after the environment creation */
+ sg_platf_init();
+ sg_platf_postparse_add_cb(SIMIX_post_create_environment);
+
}
if (!simix_timers) {
simix_timers = xbt_heap_new(8, &free);
}
- XBT_DEBUG("ADD SIMIX LEVELS");
SIMIX_HOST_LEVEL = xbt_lib_add_level(host_lib,SIMIX_host_destroy);
+ SIMIX_STORAGE_LEVEL = xbt_lib_add_level(storage_lib, SIMIX_storage_destroy);
+
+ if (sg_cfg_get_boolean("clean_atexit"))
+ atexit(SIMIX_clean);
+
+ if (_sg_cfg_exit_asap)
+ exit(0);
}
/**
+ * \ingroup SIMIX_API
* \brief Clean the SIMIX simulation
*
* This functions remove the memory used by SIMIX
*/
+int cleaned = 0;
void SIMIX_clean(void)
{
-#ifdef TIME_BENCH
+#ifdef TIME_BENCH_PER_SR
smx_ctx_raw_new_sr();
#endif
-
+ if (cleaned) return; // to avoid double cleaning by java and C
+ cleaned = 1;
/* Kill everyone (except maestro) */
- SIMIX_process_killall(simix_global->maestro_process);
+ SIMIX_process_killall(simix_global->maestro_process, 1);
/* Exit the SIMIX network module */
SIMIX_network_exit();
surf_exit();
+#ifdef TIME_BENCH_AMDAHL
+ xbt_os_cputimer_stop(simix_global->timer_seq);
+ XBT_INFO("Amdahl timing informations. Sequential time: %f; Parallel time: %f",
+ xbt_os_timer_elapsed(simix_global->timer_seq),
+ xbt_os_timer_elapsed(simix_global->timer_par));
+ xbt_os_timer_free(simix_global->timer_seq);
+ xbt_os_timer_free(simix_global->timer_par);
+#endif
+
xbt_mallocator_free(simix_global->action_mallocator);
xbt_free(simix_global);
simix_global = NULL;
/**
+ * \ingroup SIMIX_API
* \brief A clock (in second).
*
* \return Return the clock.
*/
XBT_INLINE double SIMIX_get_clock(void)
{
- if(MC_IS_ENABLED){
+ if(MC_is_active()){
return MC_process_clock_get(SIMIX_process_self());
}else{
return surf_get_clock();
}
}
+static int process_syscall_color(void *p)
+{
+ switch ((*(smx_process_t *)p)->simcall.call) {
+ case SIMCALL_NONE:
+ case SIMCALL_PROCESS_KILL:
+ return 2;
+ case SIMCALL_PROCESS_RESUME:
+ return 1;
+ default:
+ return 0;
+ }
+}
+
+/**
+ * \ingroup SIMIX_API
+ * \brief Run the main simulation loop.
+ */
void SIMIX_run(void)
{
double time = 0;
smx_process_t process;
- xbt_swag_t set;
surf_action_t action;
smx_timer_t timer;
surf_model_t model;
do {
XBT_DEBUG("New Schedule Round; size(queue)=%lu",
xbt_dynar_length(simix_global->process_to_run));
-#ifdef TIME_BENCH
+#ifdef TIME_BENCH_PER_SR
smx_ctx_raw_new_sr();
#endif
while (!xbt_dynar_is_empty(simix_global->process_to_run)) {
XBT_DEBUG("New Sub-Schedule Round; size(queue)=%lu",
xbt_dynar_length(simix_global->process_to_run));
+
+ /* Run all processes that are ready to run, possibly in parallel */
+#ifdef TIME_BENCH_AMDAHL
+ xbt_os_cputimer_stop(simix_global->timer_seq);
+ xbt_os_cputimer_resume(simix_global->timer_par);
+#endif
SIMIX_process_runall();
+#ifdef TIME_BENCH_AMDAHL
+ xbt_os_cputimer_stop(simix_global->timer_par);
+ xbt_os_cputimer_resume(simix_global->timer_seq);
+#endif
+
+ /* Move all killing processes to the end of the list, because killing a process that have an ongoing simcall is a bad idea */
+ xbt_dynar_three_way_partition(simix_global->process_that_ran, process_syscall_color);
+
+ /* answer sequentially and in a fixed arbitrary order all the simcalls that were issued during that sub-round */
+
+ /* WARNING, the order *must* be fixed or you'll jeopardize the simulation reproducibility (see RR-7653) */
+
+ /* Here, the order is ok because:
+ *
+ * Short proof: only maestro adds stuff to the process_to_run array, so the execution order of user contexts do not impact its order.
+ *
+ * Long proof: processes remain sorted through an arbitrary (implicit, complex but fixed) order in all cases.
+ *
+ * - if there is no kill during the simulation, processes remain sorted according by their PID.
+ * rational: This can be proved inductively.
+ * Assume that process_to_run is sorted at a beginning of one round (it is at round 0: the deployment file is parsed linearly).
+ * Let's show that it is still so at the end of this round.
+ * - if a process is added when being created, that's from maestro. It can be either at startup
+ * time (and then in PID order), or in response to a process_create simcall. Since simcalls are handled
+ * in arbitrary order (inductive hypothesis), we are fine.
+ * - If a process is added because it's getting killed, its subsequent actions shouldn't matter
+ * - If a process gets added to process_to_run because one of their blocking action constituting the meat
+ * of a simcall terminates, we're still good. Proof:
+ * - You are added from SIMIX_simcall_answer() only. When this function is called depends on the resource
+ * kind (network, cpu, disk, whatever), but the same arguments hold. Let's take communications as an example.
+ * - For communications, this function is called from SIMIX_comm_finish().
+ * This function itself don't mess with the order since simcalls are handled in FIFO order.
+ * The function is called:
+ * - before the comm starts (invalid parameters, or resource already dead or whatever).
+ * The order then trivial holds since maestro didn't interrupt its handling of the simcall yet
+ * - because the communication failed or were canceled after startup. In this case, it's called from the function
+ * we are in, by the chunk:
+ * set = model->states.failed_action_set;
+ * while ((action = xbt_swag_extract(set)))
+ * SIMIX_simcall_post((smx_action_t) action->data);
+ * This order is also fixed because it depends of the order in which the surf actions were
+ * added to the system, and only maestro can add stuff this way, through simcalls.
+ * We thus use the inductive hypothesis once again to conclude that the order in which actions are
+ * poped out of the swag does not depend on the user code's execution order.
+ * - because the communication terminated. In this case, actions are served in the order given by
+ * set = model->states.done_action_set;
+ * while ((action = xbt_swag_extract(set)))
+ * SIMIX_simcall_post((smx_action_t) action->data);
+ * and the argument is very similar to the previous one.
+ * So, in any case, the orders of calls to SIMIX_comm_finish() do not depend on the order in which user processes are executed.
+ * 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.
+ * So, if there is no killing in the simulation, the simulation reproducibility is not jeopardized.
+ * - If there is some process killings, the order is changed by this decision that comes from user-land
+ * But this decision may not have been motivated by a situation that were different because the simulation is not reproducible.
+ * So, even the order change induced by the process killing is perfectly reproducible.
+ *
+ * So science works, bitches [http://xkcd.com/54/].
+ *
+ * We could sort the process_that_ran array completely so that we can describe the order in which simcalls are handled
+ * (like "according to the PID of issuer"), but it's not mandatory (order is fixed already even if unfriendly).
+ * That would thus be a pure waste of time.
+ */
+
xbt_dynar_foreach(simix_global->process_that_ran, iter, process) {
if (process->simcall.call != SIMCALL_NONE) {
SIMIX_simcall_pre(&process->simcall, 0);
/* Handle any pending timer */
while (xbt_heap_size(simix_timers) > 0 && SIMIX_get_clock() >= SIMIX_timer_next()) {
//FIXME: make the timers being real callbacks
- // (i.e. provide dispatchers that read and expand the args)
+ // (i.e. provide dispatchers that read and expand the args)
timer = xbt_heap_pop(simix_timers);
if (timer->func)
((void (*)(void*))timer->func)(timer->args);
+ xbt_free(timer);
}
+
/* Wake up all processes waiting for a Surf action to finish */
xbt_dynar_foreach(model_list, iter, model) {
- set = model->states.failed_action_set;
- while ((action = xbt_swag_extract(set)))
- SIMIX_simcall_post((smx_action_t) action->data);
- set = model->states.done_action_set;
- while ((action = xbt_swag_extract(set)))
- SIMIX_simcall_post((smx_action_t) action->data);
+ while ((action = surf_model_extract_failed_action_set(model)))
+ SIMIX_simcall_post((smx_action_t) surf_action_get_data(action));
+
+ while ((action = surf_model_extract_done_action_set(model)))
+ if (surf_action_get_data(action) == NULL)
+ XBT_DEBUG("probably vcpu's action %p, skip", action);
+ else
+ SIMIX_simcall_post((smx_action_t) surf_action_get_data(action));
+ }
+
+ /* Autorestart all process */
+ if(host_that_restart) {
+ char *hostname = NULL;
+ xbt_dynar_foreach(host_that_restart,iter,hostname) {
+ XBT_INFO("Restart processes on host: %s",hostname);
+ SIMIX_host_autorestart(SIMIX_host_get_by_name(hostname));
+ }
+ xbt_dynar_reset(host_that_restart);
}
/* Clean processes to destroy */
SIMIX_process_empty_trash();
+
+ XBT_DEBUG("### time %f, empty %d", time, xbt_dynar_is_empty(simix_global->process_to_run));
+ // !(time == -1.0 && xbt_dynar_is_empty())
+
+
} while (time != -1.0 || !xbt_dynar_is_empty(simix_global->process_to_run));
if (xbt_swag_size(simix_global->process_list) != 0) {
TRACE_end();
#endif
- XBT_WARN("Oops ! Deadlock or code not perfectly clean.");
+ XBT_CRITICAL("Oops ! Deadlock or code not perfectly clean.");
SIMIX_display_process_status();
xbt_abort();
}
}
/**
- * \brief Set the date to execute a function
+ * \brief Set the date to execute a function
*
* Set the date to execute the function on the surf.
- * \param date Date to execute function
- * \param function Function to be executed
- * \param arg Parameters of the function
+ * \param date Date to execute function
+ * \param function Function to be executed
+ * \param arg Parameters of the function
*
*/
XBT_INLINE void SIMIX_timer_set(double date, void *function, void *arg)
*
* \param function Kill process function
*/
-XBT_INLINE void SIMIX_function_register_process_kill(void_pfn_smxprocess_t
+XBT_INLINE void SIMIX_function_register_process_kill(void_pfn_smxprocess_t_smxprocess_t
function)
{
simix_global->kill_process_function = function;
case SIMIX_ACTION_IO:
action_description = "I/O";
+ break;
+ /* **************************************/
+ /* TUTORIAL: New API */
+ case SIMIX_ACTION_NEW_API:
+ action_description = "NEW API";
+ /* **************************************/
+
break;
}
XBT_INFO("Process %lu (%s@%s): waiting for %s action %p (%s) in state %d to finish",
- process->pid, process->name, process->smx_host->name,
+ process->pid, process->name, sg_host_name(process->smx_host),
action_description, process->waiting_action,
process->waiting_action->name, (int)process->waiting_action->state);
}
else {
- XBT_INFO("Process %lu (%s@%s)", process->pid, process->name, process->smx_host->name);
+ XBT_INFO("Process %lu (%s@%s)", process->pid, process->name, sg_host_name(process->smx_host));
}
}
}
memset(action, 0, sizeof(s_smx_action_t));
((smx_action_t) action)->simcalls = fifo;
}
+
+xbt_dict_t SIMIX_pre_asr_get_properties(smx_simcall_t simcall, const char *name){
+ return SIMIX_asr_get_properties(name);
+}
+xbt_dict_t SIMIX_asr_get_properties(const char *name)
+{
+ return xbt_lib_get_or_null(as_router_lib, name, ROUTING_PROP_ASR_LEVEL);
+}
+
