-/* Copyright (c) 2008-2012. Da SimGrid Team. All rights reserved. */
+/* Copyright (c) 2008-2013. The SimGrid Team.
+ * All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_dpor, mc,
"Logging specific to MC DPOR exploration");
+/********** Global variables **********/
+
xbt_dynar_t visited_states;
+xbt_dict_t first_enabled_state;
+
+/********** Static functions ***********/
+
+static void visited_state_free(mc_visited_state_t state){
+ if(state){
+ MC_free_snapshot(state->system_state);
+ xbt_free(state);
+ }
+}
+
+static void visited_state_free_voidp(void *s){
+ visited_state_free((mc_visited_state_t) * (void **) s);
+}
+
+static mc_visited_state_t visited_state_new(){
+
+ mc_visited_state_t new_state = NULL;
+ new_state = xbt_new0(s_mc_visited_state_t, 1);
+ new_state->heap_bytes_used = mmalloc_get_bytes_used(std_heap);
+ new_state->nb_processes = xbt_swag_size(simix_global->process_list);
+ new_state->system_state = MC_take_snapshot();
+ new_state->num = mc_stats->expanded_states;
+ new_state->other_num = -1;
+
+ return new_state;
+
+}
+
+static int get_search_interval(xbt_dynar_t all_states, mc_visited_state_t state, int *min, int *max){
+
+ int raw_mem_set = (mmalloc_get_current_heap() == raw_heap);
+
+ MC_SET_RAW_MEM;
+
+ int cursor = 0, previous_cursor, next_cursor;
+ mc_visited_state_t state_test;
+ int start = 0;
+ int end = xbt_dynar_length(all_states) - 1;
+
+ while(start <= end){
+ cursor = (start + end) / 2;
+ state_test = (mc_visited_state_t)xbt_dynar_get_as(all_states, cursor, mc_visited_state_t);
+ if(state_test->nb_processes < state->nb_processes){
+ start = cursor + 1;
+ }else if(state_test->nb_processes > state->nb_processes){
+ end = cursor - 1;
+ }else{
+ if(state_test->heap_bytes_used < state->heap_bytes_used){
+ start = cursor +1;
+ }else if(state_test->heap_bytes_used > state->heap_bytes_used){
+ end = cursor - 1;
+ }else{
+ *min = *max = cursor;
+ previous_cursor = cursor - 1;
+ while(previous_cursor >= 0){
+ state_test = (mc_visited_state_t)xbt_dynar_get_as(all_states, previous_cursor, mc_visited_state_t);
+ if(state_test->nb_processes != state->nb_processes || state_test->heap_bytes_used != state->heap_bytes_used)
+ break;
+ *min = previous_cursor;
+ previous_cursor--;
+ }
+ next_cursor = cursor + 1;
+ while(next_cursor < xbt_dynar_length(all_states)){
+ state_test = (mc_visited_state_t)xbt_dynar_get_as(all_states, next_cursor, mc_visited_state_t);
+ if(state_test->nb_processes != state->nb_processes || state_test->heap_bytes_used != state->heap_bytes_used)
+ break;
+ *max = next_cursor;
+ next_cursor++;
+ }
+ if(!raw_mem_set)
+ MC_UNSET_RAW_MEM;
+ return -1;
+ }
+ }
+ }
+
+ if(!raw_mem_set)
+ MC_UNSET_RAW_MEM;
-static int is_visited_state(void);
+ return cursor;
+}
static int is_visited_state(){
if(_sg_mc_visited == 0)
- return 0;
+ return -1;
int raw_mem_set = (mmalloc_get_current_heap() == raw_heap);
MC_SET_RAW_MEM;
- mc_snapshot_t new_state = NULL;
- new_state = MC_take_snapshot();
-
- MC_UNSET_RAW_MEM;
+ mc_visited_state_t new_state = visited_state_new();
if(xbt_dynar_is_empty(visited_states)){
- MC_SET_RAW_MEM;
xbt_dynar_push(visited_states, &new_state);
- MC_UNSET_RAW_MEM;
- if(raw_mem_set)
- MC_SET_RAW_MEM;
-
- return 0;
+ if(!raw_mem_set)
+ MC_UNSET_RAW_MEM;
+
+ return -1;
}else{
- MC_SET_RAW_MEM;
-
- unsigned int cursor = 0;
- mc_snapshot_t state_test = NULL;
-
- xbt_dynar_foreach(visited_states, cursor, state_test){
- if(XBT_LOG_ISENABLED(mc_dpor, xbt_log_priority_debug))
- XBT_DEBUG("****** Pair visited #%d ******", cursor + 1);
- if(snapshot_compare(new_state, state_test, NULL, NULL) == 0){
- if(raw_mem_set)
- MC_SET_RAW_MEM;
+ int min = -1, max = -1, index;
+ int res;
+ mc_visited_state_t state_test;
+
+ index = get_search_interval(visited_states, new_state, &min, &max);
+
+ if(min != -1 && max != -1){
+ res = xbt_parmap_mc_apply(parmap, snapshot_compare, xbt_dynar_get_ptr(visited_states, min), (max-min)+1, new_state);
+ if(res != -1){
+ state_test = (mc_visited_state_t)xbt_dynar_get_as(visited_states, (min+res)-1, mc_visited_state_t);
+ if(state_test->other_num == -1)
+ new_state->other_num = state_test->num;
else
+ new_state->other_num = state_test->other_num;
+ if(dot_output == NULL)
+ XBT_DEBUG("State %d already visited ! (equal to state %d)", new_state->num, state_test->num);
+ else
+ XBT_DEBUG("State %d already visited ! (equal to state %d (state %d in dot_output))", new_state->num, state_test->num, new_state->other_num);
+ xbt_dynar_remove_at(visited_states, (min + res) - 1, NULL);
+ xbt_dynar_insert_at(visited_states, (min+res) - 1, &new_state);
+ if(!raw_mem_set)
MC_UNSET_RAW_MEM;
-
- return 1;
- }
+ return new_state->other_num;
+ }
+ xbt_dynar_insert_at(visited_states, min, &new_state);
+ }else{
+ state_test = (mc_visited_state_t)xbt_dynar_get_as(visited_states, index, mc_visited_state_t);
+ if(state_test->nb_processes < new_state->nb_processes){
+ xbt_dynar_insert_at(visited_states, index+1, &new_state);
+ }else{
+ if(state_test->heap_bytes_used < new_state->heap_bytes_used)
+ xbt_dynar_insert_at(visited_states, index + 1, &new_state);
+ else
+ xbt_dynar_insert_at(visited_states, index, &new_state);
+ }
}
- if(xbt_dynar_length(visited_states) == _sg_mc_visited){
- mc_snapshot_t state_to_remove = NULL;
- xbt_dynar_shift(visited_states, &state_to_remove);
- MC_free_snapshot(state_to_remove);
+ if(xbt_dynar_length(visited_states) > _sg_mc_visited){
+ int min2 = mc_stats->expanded_states;
+ unsigned int cursor2 = 0;
+ unsigned int index2 = 0;
+ xbt_dynar_foreach(visited_states, cursor2, state_test){
+ if(state_test->num < min2){
+ index2 = cursor2;
+ min2 = state_test->num;
+ }
+ }
+ xbt_dynar_remove_at(visited_states, index2, NULL);
}
- xbt_dynar_push(visited_states, &new_state);
-
- MC_UNSET_RAW_MEM;
-
- if(raw_mem_set)
- MC_SET_RAW_MEM;
+ if(!raw_mem_set)
+ MC_UNSET_RAW_MEM;
- return 0;
+ return -1;
}
}
MC_SET_RAW_MEM;
initial_state = MC_state_new();
- visited_states = xbt_dynar_new(sizeof(mc_snapshot_t), NULL);
+ if(_sg_mc_visited > 0)
+ visited_states = xbt_dynar_new(sizeof(mc_visited_state_t), visited_state_free_voidp);
+
+ first_enabled_state = xbt_dict_new_homogeneous(&xbt_free_f);
MC_UNSET_RAW_MEM;
xbt_swag_foreach(process, simix_global->process_list){
if(MC_process_is_enabled(process)){
MC_state_interleave_process(initial_state, process);
+ if(mc_reduce_kind != e_mc_reduce_none)
+ break;
}
}
xbt_fifo_unshift(mc_stack_safety, initial_state);
+ /* To ensure the soundness of DPOR, we have to keep a list of
+ processes which are still enabled at each step of the exploration.
+ If max depth is reached, we interleave them in the state in which they have
+ been enabled for the first time. */
+ xbt_swag_foreach(process, simix_global->process_list){
+ if(MC_process_is_enabled(process)){
+ char *key = bprintf("%lu", process->pid);
+ char *data = bprintf("%d", xbt_fifo_size(mc_stack_safety));
+ xbt_dict_set(first_enabled_state, key, data, NULL);
+ xbt_free(key);
+ }
+ }
+
MC_UNSET_RAW_MEM;
if(raw_mem_set)
void MC_dpor(void)
{
- char *req_str;
+ char *req_str = NULL;
int value;
smx_simcall_t req = NULL, prev_req = NULL;
mc_state_t state = NULL, prev_state = NULL, next_state = NULL, restore_state=NULL;
smx_process_t process = NULL;
xbt_fifo_item_t item = NULL;
- int pos, i;
- int proc_eval[simix_process_maxpid];
+ int pos;
+ int visited_state = -1;
+ int enabled = 0;
while (xbt_fifo_size(mc_stack_safety) > 0) {
xbt_fifo_get_item_content(xbt_fifo_get_first_item(mc_stack_safety));
XBT_DEBUG("**************************************************");
- XBT_DEBUG("Exploration depth=%d (state=%p)(%u interleave)",
- xbt_fifo_size(mc_stack_safety), state,
- MC_state_interleave_size(state));
-
+ XBT_DEBUG("Exploration depth=%d (state=%p, num %d)(%u interleave, user_max_depth %d)",
+ xbt_fifo_size(mc_stack_safety), state, state->num,
+ MC_state_interleave_size(state), user_max_depth_reached);
+
/* Update statistics */
mc_stats->visited_states++;
/* If there are processes to interleave and the maximum depth has not been reached
then perform one step of the exploration algorithm */
- if (xbt_fifo_size(mc_stack_safety) < _sg_mc_max_depth &&
- (req = MC_state_get_request(state, &value))) {
+ if (xbt_fifo_size(mc_stack_safety) <= _sg_mc_max_depth && !user_max_depth_reached &&
+ (req = MC_state_get_request(state, &value)) && visited_state == -1) {
/* Debug information */
if(XBT_LOG_ISENABLED(mc_dpor, xbt_log_priority_debug)){
XBT_DEBUG("Execute: %s", req_str);
xbt_free(req_str);
}
+
+ MC_SET_RAW_MEM;
+ if(dot_output != NULL)
+ req_str = MC_request_get_dot_output(req, value);
+ MC_UNSET_RAW_MEM;
MC_state_set_executed_request(state, req, value);
mc_stats->executed_transitions++;
+ MC_SET_RAW_MEM;
+ char *key = bprintf("%lu", req->issuer->pid);
+ xbt_dict_remove(first_enabled_state, key);
+ xbt_free(key);
+ MC_UNSET_RAW_MEM;
+
/* Answer the request */
SIMIX_simcall_pre(req, value); /* After this call req is no longer usefull */
next_state = MC_state_new();
- if(!is_visited_state()){
+ if((visited_state = is_visited_state()) == -1){
/* Get an enabled process and insert it in the interleave set of the next state */
xbt_swag_foreach(process, simix_global->process_list){
if(MC_process_is_enabled(process)){
MC_state_interleave_process(next_state, process);
+ if(mc_reduce_kind != e_mc_reduce_none)
+ break;
}
}
next_state->system_state = MC_take_snapshot();
}
+ if(dot_output != NULL)
+ fprintf(dot_output, "\"%d\" -> \"%d\" [%s];\n", state->num, next_state->num, req_str);
+
}else{
- XBT_DEBUG("State already visited !");
-
+ if(dot_output != NULL)
+ fprintf(dot_output, "\"%d\" -> \"%d\" [%s];\n", state->num, visited_state, req_str);
+
}
xbt_fifo_unshift(mc_stack_safety, next_state);
- MC_UNSET_RAW_MEM;
- /* FIXME: Update Statistics
- mc_stats->state_size +=
- xbt_setset_set_size(next_state->enabled_transitions);*/
+ /* Insert in dict all enabled processes, if not included yet */
+ xbt_swag_foreach(process, simix_global->process_list){
+ if(MC_process_is_enabled(process)){
+ char *key = bprintf("%lu", process->pid);
+ if(xbt_dict_get_or_null(first_enabled_state, key) == NULL){
+ char *data = bprintf("%d", xbt_fifo_size(mc_stack_safety));
+ xbt_dict_set(first_enabled_state, key, data, NULL);
+ }
+ xbt_free(key);
+ }
+ }
+
+ if(dot_output != NULL)
+ xbt_free(req_str);
+
+ MC_UNSET_RAW_MEM;
/* Let's loop again */
/* The interleave set is empty or the maximum depth is reached, let's back-track */
} else {
- if(xbt_fifo_size(mc_stack_safety) == _sg_mc_max_depth)
- XBT_WARN("/!\\ Max depth reached ! /!\\ ");
- else
- XBT_DEBUG("There are no more processes to interleave.");
+ if((xbt_fifo_size(mc_stack_safety) > _sg_mc_max_depth) || user_max_depth_reached || visited_state != -1){
+
+ if(user_max_depth_reached && visited_state == -1)
+ XBT_DEBUG("User max depth reached !");
+ else if(visited_state == -1)
+ XBT_WARN("/!\\ Max depth reached ! /!\\ ");
+
+ visited_state = -1;
+
+ /* Interleave enabled processes in the state in which they have been enabled for the first time */
+ xbt_swag_foreach(process, simix_global->process_list){
+ if(MC_process_is_enabled(process)){
+ char *key = bprintf("%lu", process->pid);
+ enabled = (int)strtoul(xbt_dict_get_or_null(first_enabled_state, key), 0, 10);
+ xbt_free(key);
+ mc_state_t state_test = NULL;
+ xbt_fifo_item_t item = NULL;
+ int cursor = xbt_fifo_size(mc_stack_safety);
+ xbt_fifo_foreach(mc_stack_safety, item, state_test, mc_state_t){
+ if(cursor-- == enabled){
+ if(!MC_state_process_is_done(state_test, process) && state_test->num != state->num){
+ XBT_DEBUG("Interleave process %lu in state %d", process->pid, state_test->num);
+ MC_state_interleave_process(state_test, process);
+ break;
+ }
+ }
+ }
+ }
+ }
+
+ }else{
+
+ XBT_DEBUG("There are no more processes to interleave. (depth %d)", xbt_fifo_size(mc_stack_safety) + 1);
+
+ }
/* Trash the current state, no longer needed */
MC_SET_RAW_MEM;
xbt_fifo_shift(mc_stack_safety);
MC_state_delete(state);
- MC_UNSET_RAW_MEM;
-
+ XBT_DEBUG("Delete state %d at depth %d", state->num, xbt_fifo_size(mc_stack_safety) + 1);
+ MC_UNSET_RAW_MEM;
+
/* Check for deadlocks */
if(MC_deadlock_check()){
MC_show_deadlock(NULL);
state that executed that previous request. */
while ((state = xbt_fifo_shift(mc_stack_safety)) != NULL) {
-
- for(i=0; i<simix_process_maxpid; i++)
- proc_eval[i] = 0;
-
- if(MC_state_interleave_size(state) == 0){
+ if(mc_reduce_kind != e_mc_reduce_none){
req = MC_state_get_internal_request(state);
xbt_fifo_foreach(mc_stack_safety, item, prev_state, mc_state_t) {
if(MC_request_depend(req, MC_state_get_internal_request(prev_state))){
XBT_DEBUG("Dependent Transitions:");
prev_req = MC_state_get_executed_request(prev_state, &value);
req_str = MC_request_to_string(prev_req, value);
- XBT_DEBUG("%s (state=%p)", req_str, prev_state);
+ XBT_DEBUG("%s (state=%d)", req_str, prev_state->num);
xbt_free(req_str);
prev_req = MC_state_get_executed_request(state, &value);
req_str = MC_request_to_string(prev_req, value);
- XBT_DEBUG("%s (state=%p)", req_str, state);
+ XBT_DEBUG("%s (state=%d)", req_str, state->num);
xbt_free(req_str);
}
+ if(!MC_state_process_is_done(prev_state, req->issuer))
+ MC_state_interleave_process(prev_state, req->issuer);
+ else
+ XBT_DEBUG("Process %p is in done set", req->issuer);
+
break;
- }else if(req->issuer == MC_state_get_executed_request(prev_state, &value)->issuer){
+ }else if(req->issuer == MC_state_get_internal_request(prev_state)->issuer){
+ XBT_DEBUG("Simcall %d and %d with same issuer", req->call, MC_state_get_internal_request(prev_state)->call);
break;
- }else if(proc_eval[MC_state_get_executed_request(prev_state, &value)->issuer->pid] == 0){
+ }else{
- MC_state_remove_interleave_process(prev_state, MC_state_get_executed_request(prev_state, &value)->issuer);
+ XBT_DEBUG("Simcall %d, process %lu (state %d) and simcall %d, process %lu (state %d) are independant", req->call, req->issuer->pid, state->num, MC_state_get_internal_request(prev_state)->call, MC_state_get_internal_request(prev_state)->issuer->pid, prev_state->num);
}
-
- proc_eval[MC_state_get_executed_request(prev_state, &value)->issuer->pid] = 1;
-
}
}
-
- if (MC_state_interleave_size(state)) {
+
+ if (MC_state_interleave_size(state) && xbt_fifo_size(mc_stack_safety) < _sg_mc_max_depth) {
/* We found a back-tracking point, let's loop */
+ XBT_DEBUG("Back-tracking to state %d at depth %d", state->num, xbt_fifo_size(mc_stack_safety) + 1);
if(_sg_mc_checkpoint){
if(state->system_state != NULL){
MC_restore_snapshot(state->system_state);
xbt_fifo_unshift(mc_stack_safety, state);
- XBT_DEBUG("Back-tracking to depth %d", xbt_fifo_size(mc_stack_safety));
MC_UNSET_RAW_MEM;
}else{
pos = xbt_fifo_size(mc_stack_safety);
}
MC_restore_snapshot(restore_state->system_state);
xbt_fifo_unshift(mc_stack_safety, state);
- XBT_DEBUG("Back-tracking to depth %d", xbt_fifo_size(mc_stack_safety));
MC_UNSET_RAW_MEM;
MC_replay(mc_stack_safety, pos);
}
}else{
xbt_fifo_unshift(mc_stack_safety, state);
- XBT_DEBUG("Back-tracking to depth %d", xbt_fifo_size(mc_stack_safety));
MC_UNSET_RAW_MEM;
MC_replay(mc_stack_safety, -1);
}
+ XBT_DEBUG("Back-tracking to state %d at depth %d", state->num, xbt_fifo_size(mc_stack_safety));
break;
} else {
+ XBT_DEBUG("Delete state %d at depth %d", state->num, xbt_fifo_size(mc_stack_safety) + 1);
MC_state_delete(state);
}
}
