X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/d013cec453ee914baf3c62275ea2042c41e7c270..9788cd051f72b982ec571c96e84577e9749188b1:/src/mc/mc_dpor.c diff --git a/src/mc/mc_dpor.c b/src/mc/mc_dpor.c index 555144c33f..4209fac184 100644 --- a/src/mc/mc_dpor.c +++ b/src/mc/mc_dpor.c @@ -1,4 +1,5 @@ -/* 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. */ @@ -8,13 +9,14 @@ 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 int is_visited_state(void); -static void visited_state_free(mc_safety_visited_state_t state); -static void visited_state_free_voidp(void *s); +/********** Static functions ***********/ -static void visited_state_free(mc_safety_visited_state_t state){ +static void visited_state_free(mc_visited_state_t state){ if(state){ MC_free_snapshot(state->system_state); xbt_free(state); @@ -22,136 +24,153 @@ static void visited_state_free(mc_safety_visited_state_t state){ } static void visited_state_free_voidp(void *s){ - visited_state_free((mc_safety_visited_state_t) * (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; + + 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_safety_visited_state_t new_state = NULL; - new_state = xbt_new0(s_mc_safety_visited_state_t, 1); - new_state->system_state = MC_take_snapshot(); - new_state->num = mc_stats->expanded_states; - - 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; + if(!raw_mem_set) + MC_UNSET_RAW_MEM; - return 0; + return -1; }else{ - MC_SET_RAW_MEM; - - size_t current_bytes_used = new_state->system_state->heap_bytes_used; - - unsigned int cursor = 0; - int previous_cursor = 0, next_cursor = 0; - int start = 0; - int end = xbt_dynar_length(visited_states) - 1; - - mc_safety_visited_state_t state_test = NULL; - size_t bytes_used_test; - int same_bytes_not_found = 1; - - while(start <= end && same_bytes_not_found){ - cursor = (start + end) / 2; - state_test = (mc_safety_visited_state_t)xbt_dynar_get_as(visited_states, cursor, mc_safety_visited_state_t); - bytes_used_test = state_test->system_state->heap_bytes_used; - if(bytes_used_test < current_bytes_used) - start = cursor + 1; - if(bytes_used_test > current_bytes_used) - end = cursor - 1; - if(bytes_used_test == current_bytes_used){ - same_bytes_not_found = 0; - if(snapshot_compare(new_state->system_state, state_test->system_state) == 0){ - xbt_dynar_remove_at(visited_states, cursor, NULL); - xbt_dynar_insert_at(visited_states, cursor, &new_state); - if(raw_mem_set) - MC_SET_RAW_MEM; - else - MC_UNSET_RAW_MEM; - return 1; - }else{ - /* Search another state with same number of bytes used */ - previous_cursor = cursor - 1; - while(previous_cursor >= 0){ - state_test = (mc_safety_visited_state_t)xbt_dynar_get_as(visited_states, previous_cursor, mc_safety_visited_state_t); - bytes_used_test = state_test->system_state->heap_bytes_used; - if(bytes_used_test != current_bytes_used) - break; - if(snapshot_compare(new_state->system_state, state_test->system_state) == 0){ - xbt_dynar_remove_at(visited_states, previous_cursor, NULL); - xbt_dynar_insert_at(visited_states, previous_cursor, &new_state); - if(raw_mem_set) - MC_SET_RAW_MEM; - else - MC_UNSET_RAW_MEM; - return 1; - } - previous_cursor--; - } - next_cursor = cursor + 1; - while(next_cursor < xbt_dynar_length(visited_states)){ - state_test = (mc_safety_visited_state_t)xbt_dynar_get_as(visited_states, next_cursor, mc_safety_visited_state_t); - bytes_used_test = state_test->system_state->heap_bytes_used; - if(bytes_used_test != current_bytes_used) - break; - if(snapshot_compare(new_state->system_state, state_test->system_state) == 0){ - xbt_dynar_remove_at(visited_states, next_cursor, NULL); - xbt_dynar_insert_at(visited_states, next_cursor, &new_state); - if(raw_mem_set) - MC_SET_RAW_MEM; - else - MC_UNSET_RAW_MEM; - return 1; - } - next_cursor++; - } - } + 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 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); } } - state_test = (mc_safety_visited_state_t)xbt_dynar_get_as(visited_states, cursor, mc_safety_visited_state_t); - bytes_used_test = state_test->system_state->heap_bytes_used; - - if(bytes_used_test < current_bytes_used) - xbt_dynar_insert_at(visited_states, cursor + 1, &new_state); - else - xbt_dynar_insert_at(visited_states, cursor, &new_state); - if(xbt_dynar_length(visited_states) > _sg_mc_visited){ - int min = mc_stats->expanded_states; + int min2 = mc_stats->expanded_states; unsigned int cursor2 = 0; - unsigned int index = 0; + unsigned int index2 = 0; xbt_dynar_foreach(visited_states, cursor2, state_test){ - if(state_test->num < min){ - index = cursor2; - min = state_test->num; + if(state_test->num < min2){ + index2 = cursor2; + min2 = state_test->num; } } - xbt_dynar_remove_at(visited_states, index, NULL); + xbt_dynar_remove_at(visited_states, index2, NULL); } - - MC_UNSET_RAW_MEM; - if(raw_mem_set) - MC_SET_RAW_MEM; + if(!raw_mem_set) + MC_UNSET_RAW_MEM; - return 0; + return -1; } } @@ -171,7 +190,10 @@ void MC_dpor_init() MC_SET_RAW_MEM; initial_state = MC_state_new(); - visited_states = xbt_dynar_new(sizeof(mc_safety_visited_state_t), visited_state_free_voidp); + 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; @@ -187,12 +209,26 @@ void MC_dpor_init() xbt_swag_foreach(process, simix_global->process_list){ if(MC_process_is_enabled(process)){ MC_state_interleave_process(initial_state, process); - XBT_DEBUG("Process %lu enabled with simcall %d", process->pid, process->simcall.call); + 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) @@ -210,15 +246,15 @@ void MC_dpor_init() void MC_dpor(void) { - char *req_str; - int value, value2; - smx_simcall_t req = NULL, prev_req = NULL, req2 = NULL; - s_smx_simcall_t req3; + 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, interleave_size; - int interleave_proc[simix_process_maxpid]; + int pos; + int visited_state = -1; + int enabled = 0; while (xbt_fifo_size(mc_stack_safety) > 0) { @@ -227,17 +263,17 @@ void MC_dpor(void) 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)){ @@ -245,41 +281,20 @@ void MC_dpor(void) 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++; - if(MC_state_interleave_size(state)){ - MC_SET_RAW_MEM; - req2 = MC_state_get_internal_request(state); - req3 = *req2; - for(i=0; ipid, prev_req->call, prev_req->issuer->pid); - interleave_proc[prev_req->issuer->pid] = 1; - }else{ - XBT_DEBUG("Simcall %d in process %lu independant with simcall %d in process %lu", req3.call, req3.issuer->pid, prev_req->call, prev_req->issuer->pid); - MC_state_remove_interleave_process(state, prev_req->issuer); - } - } - } - xbt_swag_foreach(process, simix_global->process_list){ - if(interleave_proc[process->pid] == 1) - MC_state_interleave_process(state, process); - } - MC_UNSET_RAW_MEM; - } - - MC_state_set_executed_request(state, req, value); + 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 */ @@ -292,13 +307,14 @@ void MC_dpor(void) 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); - XBT_DEBUG("Process %lu enabled with simcall %d", process->pid, process->simcall.call); + if(mc_reduce_kind != e_mc_reduce_none) + break; } } @@ -306,13 +322,33 @@ void MC_dpor(void) 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); + + /* 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 */ @@ -320,17 +356,49 @@ void MC_dpor(void) /* 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); @@ -346,38 +414,45 @@ void MC_dpor(void) state that executed that previous request. */ while ((state = xbt_fifo_shift(mc_stack_safety)) != NULL) { - 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))){ - if(XBT_LOG_ISENABLED(mc_dpor, xbt_log_priority_debug)){ - 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_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_free(req_str); - } + 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))){ + if(XBT_LOG_ISENABLED(mc_dpor, xbt_log_priority_debug)){ + 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=%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=%d)", req_str, state->num); + xbt_free(req_str); + } - break; + 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); - }else if(req->issuer == MC_state_get_internal_request(prev_state)->issuer){ + break; - XBT_DEBUG("Simcall %d and %d with same issuer", req->call, MC_state_get_internal_request(prev_state)->call); - break; + }else if(req->issuer == MC_state_get_internal_request(prev_state)->issuer){ - }else{ + XBT_DEBUG("Simcall %d and %d with same issuer", req->call, MC_state_get_internal_request(prev_state)->call); + break; - MC_state_remove_interleave_process(prev_state, req->issuer); - XBT_DEBUG("Simcall %d in process %lu independant with simcall %d process %lu", req->call, req->issuer->pid, MC_state_get_internal_request(prev_state)->call, MC_state_get_internal_request(prev_state)->issuer->pid); + }else{ + + 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); + } } } - - 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); @@ -405,9 +480,10 @@ void MC_dpor(void) MC_UNSET_RAW_MEM; MC_replay(mc_stack_safety, -1); } - XBT_DEBUG("Back-tracking to depth %d", xbt_fifo_size(mc_stack_safety)); + 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); } }