1 /* Copyright (c) 2004-2013. 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 "xbt/sysdep.h"
10 #include "xbt/mallocator.h"
11 #include "maxmin_private.hpp"
13 #include <stdio.h> /* sprintf */
15 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_maxmin, surf,
16 "Logging specific to SURF (maxmin)");
18 typedef struct s_dyn_light {
22 } s_dyn_light_t, *dyn_light_t;
24 XBT_EXPORT_NO_IMPORT(double) sg_maxmin_precision = 0.00001;
26 static void *lmm_variable_mallocator_new_f(void);
27 static void lmm_variable_mallocator_free_f(void *var);
28 #define lmm_variable_mallocator_reset_f ((void_f_pvoid_t)NULL)
29 static void lmm_update_modified_set(lmm_system_t sys,
30 lmm_constraint_t cnst);
31 static void lmm_remove_all_modified_set(lmm_system_t sys);
32 static int Global_debug_id = 1;
33 static int Global_const_debug_id = 1;
35 static void lmm_var_free(lmm_system_t sys, lmm_variable_t var);
36 static XBT_INLINE void lmm_cnst_free(lmm_system_t sys,
37 lmm_constraint_t cnst);
39 lmm_system_t lmm_system_new(int selective_update)
41 lmm_system_t l = NULL;
43 s_lmm_constraint_t cnst;
45 l = xbt_new0(s_lmm_system_t, 1);
48 l->selective_update_active = selective_update;
49 l->visited_counter = 1;
51 XBT_DEBUG("Setting selective_update_active flag to %d\n",
52 l->selective_update_active);
54 xbt_swag_init(&(l->variable_set),
55 xbt_swag_offset(var, variable_set_hookup));
56 xbt_swag_init(&(l->constraint_set),
57 xbt_swag_offset(cnst, constraint_set_hookup));
59 xbt_swag_init(&(l->active_constraint_set),
60 xbt_swag_offset(cnst, active_constraint_set_hookup));
62 xbt_swag_init(&(l->modified_constraint_set),
63 xbt_swag_offset(cnst, modified_constraint_set_hookup));
64 xbt_swag_init(&(l->saturated_variable_set),
65 xbt_swag_offset(var, saturated_variable_set_hookup));
66 xbt_swag_init(&(l->saturated_constraint_set),
67 xbt_swag_offset(cnst, saturated_constraint_set_hookup));
69 l->variable_mallocator = xbt_mallocator_new(65536,
70 lmm_variable_mallocator_new_f,
71 lmm_variable_mallocator_free_f,
72 lmm_variable_mallocator_reset_f);
77 void lmm_system_free(lmm_system_t sys)
79 lmm_variable_t var = NULL;
80 lmm_constraint_t cnst = NULL;
82 while ((var = (lmm_variable_t) extract_variable(sys))) {
84 ("Variable %p (%d) still in LMM system when freing it: this may be a bug",
86 lmm_var_free(sys, var);
89 while ((cnst = (lmm_constraint_t) extract_constraint(sys)))
90 lmm_cnst_free(sys, cnst);
92 xbt_mallocator_free(sys->variable_mallocator);
96 static XBT_INLINE void lmm_variable_disable(lmm_system_t sys, lmm_variable_t var)
101 lmm_element_t elem = NULL;
103 XBT_IN("(sys=%p, var=%p)", sys, var);
107 for (i = 0; i < var->cnsts_number; i++) {
108 elem = &var->cnsts[i];
109 xbt_swag_remove(elem, &(elem->constraint->element_set));
110 xbt_swag_remove(elem, &(elem->constraint->active_element_set));
111 if (!xbt_swag_size(&(elem->constraint->element_set)))
112 make_constraint_inactive(sys, elem->constraint);
115 var->cnsts[n].constraint = elem->constraint;
120 var->cnsts_number = n;
121 lmm_update_modified_set(sys, var->cnsts[0].constraint);
124 var->cnsts_number = 0;
128 static void lmm_var_free(lmm_system_t sys, lmm_variable_t var)
131 lmm_variable_disable(sys, var);
132 xbt_mallocator_release(sys->variable_mallocator, var);
135 static XBT_INLINE void lmm_cnst_free(lmm_system_t sys,
136 lmm_constraint_t cnst)
138 /* xbt_assert(xbt_swag_size(&(cnst->element_set)), */
139 /* "This list should be empty!"); */
140 make_constraint_inactive(sys, cnst);
144 lmm_constraint_t lmm_constraint_new(lmm_system_t sys, void *id,
147 lmm_constraint_t cnst = NULL;
148 s_lmm_element_t elem;
150 cnst = xbt_new0(s_lmm_constraint_t, 1);
152 cnst->id_int = Global_const_debug_id++;
153 xbt_swag_init(&(cnst->element_set),
154 xbt_swag_offset(elem, element_set_hookup));
155 xbt_swag_init(&(cnst->active_element_set),
156 xbt_swag_offset(elem, active_element_set_hookup));
158 cnst->bound = bound_value;
161 insert_constraint(sys, cnst);
166 void lmm_constraint_shared(lmm_constraint_t cnst)
171 int lmm_constraint_is_shared(lmm_constraint_t cnst)
173 return (cnst->shared);
176 XBT_INLINE void lmm_constraint_free(lmm_system_t sys,
177 lmm_constraint_t cnst)
179 remove_constraint(sys, cnst);
180 lmm_cnst_free(sys, cnst);
183 static void *lmm_variable_mallocator_new_f(void)
185 lmm_variable_t var = xbt_new(s_lmm_variable_t, 1);
186 var->cnsts = NULL; /* will be created by realloc */
190 static void lmm_variable_mallocator_free_f(void *var)
192 xbt_free(((lmm_variable_t) var)->cnsts);
196 lmm_variable_t lmm_variable_new(lmm_system_t sys, void *id,
198 double bound, int number_of_constraints)
200 lmm_variable_t var = NULL;
203 XBT_IN("(sys=%p, id=%p, weight=%f, bound=%f, num_cons =%d)",
204 sys, id, weight, bound, number_of_constraints);
206 var = (lmm_variable_t) xbt_mallocator_get(sys->variable_mallocator);
208 var->id_int = Global_debug_id++;
209 var->cnsts = (s_lmm_element_t *) xbt_realloc(var->cnsts, number_of_constraints * sizeof(s_lmm_element_t));
210 for (i = 0; i < number_of_constraints; i++) {
211 var->cnsts[i].element_set_hookup.next = NULL;
212 var->cnsts[i].element_set_hookup.prev = NULL;
213 var->cnsts[i].active_element_set_hookup.next = NULL;
214 var->cnsts[i].active_element_set_hookup.prev = NULL;
215 var->cnsts[i].constraint = NULL;
216 var->cnsts[i].variable = NULL;
217 var->cnsts[i].value = 0.0;
219 var->cnsts_size = number_of_constraints;
220 var->cnsts_number = 0;
221 var->weight = weight;
224 var->visited = sys->visited_counter - 1;
227 var->func_f = func_f_def;
228 var->func_fp = func_fp_def;
229 var->func_fpi = func_fpi_def;
231 var->variable_set_hookup.next = NULL;
232 var->variable_set_hookup.prev = NULL;
233 var->saturated_variable_set_hookup.next = NULL;
234 var->saturated_variable_set_hookup.prev = NULL;
237 xbt_swag_insert_at_head(var, &(sys->variable_set));
239 xbt_swag_insert_at_tail(var, &(sys->variable_set));
241 XBT_OUT(" returns %p", var);
245 void lmm_variable_free(lmm_system_t sys, lmm_variable_t var)
247 remove_variable(sys, var);
248 lmm_var_free(sys, var);
251 double lmm_variable_getvalue(lmm_variable_t var)
256 XBT_INLINE double lmm_variable_getbound(lmm_variable_t var)
261 /* Replace the content of elem_a with elem_b. The content of elem_b is cleared. */
262 static void renew_elem_entry(lmm_element_t elem_a, lmm_element_t elem_b)
264 elem_a->constraint = elem_b->constraint;
265 elem_a->variable = elem_b->variable;
266 elem_a->value = elem_b->value;
268 /* If elem_b is in the element_set swag, register the new element to the swag. */
269 if (xbt_swag_remove(elem_b, &(elem_b->constraint->element_set))) {
270 if (elem_a->variable->weight)
271 xbt_swag_insert_at_head(elem_a, &(elem_a->constraint->element_set));
273 xbt_swag_insert_at_tail(elem_a, &(elem_a->constraint->element_set));
276 if (xbt_swag_remove(elem_b, &(elem_b->constraint->active_element_set))) {
277 if (elem_a->variable->weight)
278 xbt_swag_insert_at_head(elem_a, &(elem_a->constraint->active_element_set));
280 xbt_swag_insert_at_tail(elem_a, &(elem_a->constraint->active_element_set));
283 elem_b->constraint = NULL;
284 elem_b->variable = NULL;
288 void lmm_shrink(lmm_system_t sys, lmm_constraint_t cnst,
291 lmm_element_t elem = NULL;
295 for (i = 0; i < var->cnsts_number; i++) {
296 elem = &(var->cnsts[i]);
297 if (elem->constraint == cnst) {
304 XBT_DEBUG("cnst %p is not found in var %p", cnst, var);
310 XBT_DEBUG("remove elem(value %lf, cnst %p, var %p) in var %p",
311 elem->value, elem->constraint, elem->variable, var);
315 /* We are going to change the constraint object and the variable object.
316 * Propagate this change to other objects. Calling here (not after
317 * modification) is correct? */
318 lmm_update_modified_set(sys, cnst);
319 lmm_update_modified_set(sys, var->cnsts[0].constraint); // will look up element_set of this constraint, and then each var in the element_set, and each var->cnsts[i].
323 /* now var->cnsts[i] is not necessary any more */
325 xbt_swag_remove(elem, &(elem->constraint->element_set));
326 xbt_swag_remove(elem, &(elem->constraint->active_element_set));
327 elem->constraint = NULL;
328 elem->variable = NULL;
333 /* We do not want to have an empty element entry before the last entry. So,
334 * plug up the hole with the last one. */
335 if (i < var->cnsts_number - 1)
336 renew_elem_entry(&var->cnsts[i], &var->cnsts[var->cnsts_number - 1]);
338 var->cnsts_number -= 1;
341 if (xbt_swag_size(&(cnst->element_set)) == 0)
342 make_constraint_inactive(sys, cnst);
345 void lmm_expand(lmm_system_t sys, lmm_constraint_t cnst,
346 lmm_variable_t var, double value)
348 lmm_element_t elem = NULL;
352 xbt_assert(var->cnsts_number < var->cnsts_size, "Too much constraints");
354 elem = &(var->cnsts[var->cnsts_number++]);
357 elem->constraint = cnst;
358 elem->variable = var;
361 xbt_swag_insert_at_head(elem, &(elem->constraint->element_set));
363 xbt_swag_insert_at_tail(elem, &(elem->constraint->element_set));
364 if(!sys->selective_update_active) {
365 make_constraint_active(sys, cnst);
366 } else if(elem->value>0 || var->weight >0) {
367 make_constraint_active(sys, cnst);
368 lmm_update_modified_set(sys, cnst);
369 if (var->cnsts_number > 1)
370 lmm_update_modified_set(sys, var->cnsts[0].constraint);
374 void lmm_expand_add(lmm_system_t sys, lmm_constraint_t cnst,
375 lmm_variable_t var, double value)
380 for (i = 0; i < var->cnsts_number; i++)
381 if (var->cnsts[i].constraint == cnst)
384 if (i < var->cnsts_number) {
386 var->cnsts[i].value += value;
388 var->cnsts[i].value = MAX(var->cnsts[i].value, value);
389 lmm_update_modified_set(sys, cnst);
391 lmm_expand(sys, cnst, var, value);
394 void lmm_elem_set_value(lmm_system_t sys, lmm_constraint_t cnst,
395 lmm_variable_t var, double value)
399 for (i = 0; i < var->cnsts_number; i++)
400 if (var->cnsts[i].constraint == cnst)
403 if (i < var->cnsts_number) {
404 var->cnsts[i].value = value;
406 lmm_update_modified_set(sys, cnst);
411 lmm_constraint_t lmm_get_cnst_from_var(lmm_system_t /*sys*/,
415 if (num < var->cnsts_number)
416 return (var->cnsts[num].constraint);
421 double lmm_get_cnst_weight_from_var(lmm_system_t /*sys*/,
425 if (num < var->cnsts_number)
426 return (var->cnsts[num].value);
431 int lmm_get_number_of_cnst_from_var(lmm_system_t /*sys*/,
434 return (var->cnsts_number);
437 lmm_variable_t lmm_get_var_from_cnst(lmm_system_t /*sys*/,
438 lmm_constraint_t cnst,
439 lmm_element_t * elem)
442 *elem = (lmm_element_t) xbt_swag_getFirst(&(cnst->element_set));
444 *elem = (lmm_element_t) xbt_swag_getNext(*elem, cnst->element_set.offset);
446 return (*elem)->variable;
451 void *lmm_constraint_id(lmm_constraint_t cnst)
456 void *lmm_variable_id(lmm_variable_t var)
461 static XBT_INLINE void saturated_constraint_set_update(double usage,
463 dyn_light_t saturated_constraint_set,
466 xbt_assert(usage > 0,"Impossible");
468 if (*min_usage < 0 || *min_usage > usage) {
470 // XBT_HERE(" min_usage=%f (cnst->remaining / cnst->usage =%f)", *min_usage, usage);
471 saturated_constraint_set->data[0] = cnst_light_num;
472 saturated_constraint_set->pos = 1;
473 } else if (*min_usage == usage) {
474 if(saturated_constraint_set->pos == saturated_constraint_set->size) { // realloc the size
475 saturated_constraint_set->size *= 2;
476 saturated_constraint_set->data = (int*) xbt_realloc(saturated_constraint_set->data, (saturated_constraint_set->size) * sizeof(int));
478 saturated_constraint_set->data[saturated_constraint_set->pos] = cnst_light_num;
479 saturated_constraint_set->pos++;
483 static XBT_INLINE void saturated_variable_set_update(
484 s_lmm_constraint_light_t *cnst_light_tab,
485 dyn_light_t saturated_constraint_set,
488 lmm_constraint_light_t cnst = NULL;
490 lmm_element_t elem = NULL;
491 xbt_swag_t elem_list = NULL;
493 for(i = 0; i< saturated_constraint_set->pos; i++){
494 cnst = &cnst_light_tab[saturated_constraint_set->data[i]];
495 elem_list = &(cnst->cnst->active_element_set);
496 xbt_swag_foreach(_elem, elem_list) {
497 elem = (lmm_element_t)_elem;
498 if (elem->variable->weight <= 0)
500 if ((elem->value > 0))
501 xbt_swag_insert(elem->variable, &(sys->saturated_variable_set));
506 void lmm_print(lmm_system_t sys)
508 void *_cnst, *_elem, *_var;
509 lmm_constraint_t cnst = NULL;
510 lmm_element_t elem = NULL;
511 lmm_variable_t var = NULL;
512 xbt_swag_t cnst_list = NULL;
513 xbt_swag_t var_list = NULL;
514 xbt_swag_t elem_list = NULL;
515 char print_buf[1024];
516 char *trace_buf = (char*) xbt_malloc0(sizeof(char));
519 /* Printing Objective */
520 var_list = &(sys->variable_set);
521 sprintf(print_buf, "MAX-MIN ( ");
523 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
524 strcat(trace_buf, print_buf);
525 xbt_swag_foreach(_var, var_list) {
526 var = (lmm_variable_t)_var;
527 sprintf(print_buf, "'%d'(%f) ", var->id_int, var->weight);
529 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
530 strcat(trace_buf, print_buf);
532 sprintf(print_buf, ")");
534 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
535 strcat(trace_buf, print_buf);
536 XBT_DEBUG("%20s", trace_buf);
537 trace_buf[0] = '\000';
539 XBT_DEBUG("Constraints");
540 /* Printing Constraints */
541 cnst_list = &(sys->active_constraint_set);
542 xbt_swag_foreach(_cnst, cnst_list) {
543 cnst = (lmm_constraint_t)_cnst;
545 elem_list = &(cnst->element_set);
546 sprintf(print_buf, "\t");
548 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
549 strcat(trace_buf, print_buf);
550 sprintf(print_buf, "%s(",(cnst->shared)?"":"max");
552 xbt_realloc(trace_buf,
553 strlen(trace_buf) + strlen(print_buf) + 1);
554 strcat(trace_buf, print_buf);
555 xbt_swag_foreach(_elem, elem_list) {
556 elem = (lmm_element_t)_elem;
557 sprintf(print_buf, "%f.'%d'(%f) %s ", elem->value,
558 elem->variable->id_int, elem->variable->value,(cnst->shared)?"+":",");
560 xbt_realloc(trace_buf,
561 strlen(trace_buf) + strlen(print_buf) + 1);
562 strcat(trace_buf, print_buf);
564 sum += elem->value * elem->variable->value;
566 sum = MAX(sum,elem->value * elem->variable->value);
568 sprintf(print_buf, "0) <= %f ('%d')", cnst->bound, cnst->id_int);
570 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
571 strcat(trace_buf, print_buf);
574 sprintf(print_buf, " [MAX-Constraint]");
576 xbt_realloc(trace_buf,
577 strlen(trace_buf) + strlen(print_buf) + 1);
578 strcat(trace_buf, print_buf);
580 XBT_DEBUG("%s", trace_buf);
581 trace_buf[0] = '\000';
582 xbt_assert(!double_positive(sum - cnst->bound),
583 "Incorrect value (%f is not smaller than %f): %g",
584 sum, cnst->bound, sum - cnst->bound);
587 XBT_DEBUG("Variables");
588 /* Printing Result */
589 xbt_swag_foreach(_var, var_list) {
590 var = (lmm_variable_t)_var;
591 if (var->bound > 0) {
592 XBT_DEBUG("'%d'(%f) : %f (<=%f)", var->id_int, var->weight, var->value,
594 xbt_assert(!double_positive(var->value - var->bound),
595 "Incorrect value (%f is not smaller than %f",
596 var->value, var->bound);
598 XBT_DEBUG("'%d'(%f) : %f", var->id_int, var->weight, var->value);
605 void lmm_solve(lmm_system_t sys)
607 void *_var, *_cnst, *_cnst_next, *_elem;
608 lmm_variable_t var = NULL;
609 lmm_constraint_t cnst = NULL;
610 lmm_element_t elem = NULL;
611 xbt_swag_t cnst_list = NULL;
612 xbt_swag_t var_list = NULL;
613 xbt_swag_t elem_list = NULL;
614 double min_usage = -1;
615 double min_bound = -1;
617 if (!(sys->modified))
620 XBT_IN("(sys=%p)", sys);
623 * Compute Usage and store the variables that reach the maximum.
627 selective_update_active ? &(sys->modified_constraint_set) :
628 &(sys->active_constraint_set);
630 XBT_DEBUG("Active constraints : %d", xbt_swag_size(cnst_list));
631 /* Init: Only modified code portions */
632 xbt_swag_foreach(_cnst, cnst_list) {
633 cnst = (lmm_constraint_t)_cnst;
634 elem_list = &(cnst->element_set);
635 //XBT_DEBUG("Variable set : %d", xbt_swag_size(elem_list));
636 xbt_swag_foreach(_elem, elem_list) {
637 var = ((lmm_element_t)_elem)->variable;
638 if (var->weight <= 0.0)
644 s_lmm_constraint_light_t *cnst_light_tab = (s_lmm_constraint_light_t *)xbt_malloc0(xbt_swag_size(cnst_list)*sizeof(s_lmm_constraint_light_t));
645 int cnst_light_num = 0;
646 dyn_light_t saturated_constraint_set = xbt_new0(s_dyn_light_t,1);
647 saturated_constraint_set->size = 5;
648 saturated_constraint_set->data = xbt_new0(int, saturated_constraint_set->size);
650 xbt_swag_foreach_safe(_cnst, _cnst_next, cnst_list) {
651 cnst = (lmm_constraint_t)_cnst;
653 cnst->remaining = cnst->bound;
654 if (cnst->remaining == 0)
657 elem_list = &(cnst->element_set);
658 xbt_swag_foreach(_elem, elem_list) {
659 elem = (lmm_element_t)_elem;
660 /* 0-weighted elements (ie, sleep actions) are at the end of the swag and we don't want to consider them */
661 if (elem->variable->weight <= 0)
663 if ((elem->value > 0)) {
665 cnst->usage += elem->value / elem->variable->weight;
666 else if (cnst->usage < elem->value / elem->variable->weight)
667 cnst->usage = elem->value / elem->variable->weight;
669 make_elem_active(elem);
670 ActionLmmPtr action = static_cast<ActionLmmPtr>(elem->variable->id);
671 if (sys->keep_track && !action->is_linked())
672 sys->keep_track->push_back(*action);
675 XBT_DEBUG("Constraint Usage '%d' : %f", cnst->id_int, cnst->usage);
676 /* Saturated constraints update */
678 if(cnst->usage > 0) {
679 cnst_light_tab[cnst_light_num].cnst = cnst;
680 cnst->cnst_light = &(cnst_light_tab[cnst_light_num]);
681 cnst_light_tab[cnst_light_num].remaining_over_usage = cnst->remaining / cnst->usage;
682 saturated_constraint_set_update(cnst_light_tab[cnst_light_num].remaining_over_usage,
683 cnst_light_num, saturated_constraint_set, &min_usage);
688 saturated_variable_set_update( cnst_light_tab,
689 saturated_constraint_set,
692 /* Saturated variables update */
695 /* Fix the variables that have to be */
696 var_list = &(sys->saturated_variable_set);
698 xbt_swag_foreach(_var, var_list) {
699 var = (lmm_variable_t)_var;
700 if (var->weight <= 0.0)
702 /* First check if some of these variables have reach their upper
703 bound and update min_usage accordingly. */
705 ("var=%d, var->bound=%f, var->weight=%f, min_usage=%f, var->bound*var->weight=%f",
706 var->id_int, var->bound, var->weight, min_usage,
707 var->bound * var->weight);
708 if ((var->bound > 0) && (var->bound * var->weight < min_usage)) {
710 min_bound = var->bound;
712 min_bound = MIN(min_bound, var->bound);
713 XBT_DEBUG("Updated min_bound=%f", min_bound);
718 while ((var = (lmm_variable_t)xbt_swag_getFirst(var_list))) {
722 var->value = min_usage / var->weight;
724 if (min_bound == var->bound)
725 var->value = var->bound;
727 xbt_swag_remove(var, var_list);
731 XBT_DEBUG("Min usage: %f, Var(%d)->weight: %f, Var(%d)->value: %f ",
732 min_usage, var->id_int, var->weight, var->id_int, var->value);
737 for (i = 0; i < var->cnsts_number; i++) {
738 elem = &var->cnsts[i];
739 cnst = elem->constraint;
741 double_update(&(cnst->remaining), elem->value * var->value);
742 double_update(&(cnst->usage), elem->value / var->weight);
743 if(cnst->usage<=0 || cnst->remaining<=0) {
744 if (cnst->cnst_light) {
745 int index = (cnst->cnst_light-cnst_light_tab);
746 XBT_DEBUG("index: %d \t cnst_light_num: %d \t || \t cnst: %p \t cnst->cnst_light: %p \t cnst_light_tab: %p ",
747 index,cnst_light_num, cnst, cnst->cnst_light, cnst_light_tab);
748 cnst_light_tab[index]=cnst_light_tab[cnst_light_num-1];
749 cnst_light_tab[index].cnst->cnst_light = &cnst_light_tab[index];
751 cnst->cnst_light = NULL;
754 cnst->cnst_light->remaining_over_usage = cnst->remaining / cnst->usage;
756 make_elem_inactive(elem);
759 make_elem_inactive(elem);
760 elem_list = &(cnst->element_set);
761 xbt_swag_foreach(_elem, elem_list) {
762 elem = (lmm_element_t)_elem;
763 if (elem->variable->weight <= 0 || elem->variable->value > 0)
766 cnst->usage = MAX(cnst->usage, elem->value / elem->variable->weight);
768 if (cnst->usage<=0 || cnst->remaining<=0) {
769 if(cnst->cnst_light) {
770 int index = (cnst->cnst_light-cnst_light_tab);
771 XBT_DEBUG("index: %d \t cnst_light_num: %d \t || \t cnst: %p \t cnst->cnst_light: %p \t cnst_light_tab: %p ",
772 index,cnst_light_num, cnst, cnst->cnst_light, cnst_light_tab);
773 cnst_light_tab[index]=cnst_light_tab[cnst_light_num-1];
774 cnst_light_tab[index].cnst->cnst_light = &cnst_light_tab[index];
776 cnst->cnst_light = NULL;
779 cnst->cnst_light->remaining_over_usage = cnst->remaining / cnst->usage;
783 xbt_swag_remove(var, var_list);
786 /* Find out which variables reach the maximum */
789 saturated_constraint_set->pos = 0;
791 for(pos=0; pos<cnst_light_num; pos++)
792 saturated_constraint_set_update(
793 cnst_light_tab[pos].remaining_over_usage,
795 saturated_constraint_set,
798 saturated_variable_set_update( cnst_light_tab,
799 saturated_constraint_set,
802 } while (cnst_light_num > 0);
805 if (sys->selective_update_active)
806 lmm_remove_all_modified_set(sys);
808 if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
812 xbt_free(saturated_constraint_set->data);
813 xbt_free(saturated_constraint_set);
814 xbt_free(cnst_light_tab);
818 /* Not a O(1) function */
820 void lmm_update(lmm_system_t sys, lmm_constraint_t cnst,
821 lmm_variable_t var, double value)
825 for (i = 0; i < var->cnsts_number; i++)
826 if (var->cnsts[i].constraint == cnst) {
827 var->cnsts[i].value = value;
829 lmm_update_modified_set(sys, cnst);
834 /** \brief Attribute the value bound to var->bound.
836 * \param sys the lmm_system_t
837 * \param var the lmm_variable_t
838 * \param bound the new bound to associate with var
840 * Makes var->bound equal to bound. Whenever this function is called
841 * a change is signed in the system. To
842 * avoid false system changing detection it is a good idea to test
843 * (bound != 0) before calling it.
846 void lmm_update_variable_bound(lmm_system_t sys, lmm_variable_t var,
852 if (var->cnsts_number)
853 lmm_update_modified_set(sys, var->cnsts[0].constraint);
857 void lmm_update_variable_weight(lmm_system_t sys, lmm_variable_t var,
863 if (weight == var->weight)
865 XBT_IN("(sys=%p, var=%p, weight=%f)", sys, var, weight);
867 var->weight = weight;
868 xbt_swag_remove(var, &(sys->variable_set));
870 xbt_swag_insert_at_head(var, &(sys->variable_set));
872 xbt_swag_insert_at_tail(var, &(sys->variable_set));
874 for (i = 0; i < var->cnsts_number; i++) {
875 elem = &var->cnsts[i];
876 xbt_swag_remove(elem, &(elem->constraint->element_set));
878 xbt_swag_insert_at_head(elem, &(elem->constraint->element_set));
880 xbt_swag_insert_at_tail(elem, &(elem->constraint->element_set));
883 lmm_update_modified_set(sys, elem->constraint);
891 double lmm_get_variable_weight(lmm_variable_t var)
896 void lmm_update_constraint_bound(lmm_system_t sys,
897 lmm_constraint_t cnst,
901 lmm_update_modified_set(sys, cnst);
905 int lmm_constraint_used(lmm_system_t sys, lmm_constraint_t cnst)
907 return xbt_swag_belongs(cnst, &(sys->active_constraint_set));
910 XBT_INLINE lmm_constraint_t lmm_get_first_active_constraint(lmm_system_t
913 return (lmm_constraint_t)xbt_swag_getFirst(&(sys->active_constraint_set));
916 XBT_INLINE lmm_constraint_t lmm_get_next_active_constraint(lmm_system_t
921 return (lmm_constraint_t)xbt_swag_getNext(cnst, (sys->active_constraint_set).offset);
924 #ifdef HAVE_LATENCY_BOUND_TRACKING
925 XBT_INLINE int lmm_is_variable_limited_by_latency(lmm_variable_t var)
927 return (double_equals(var->bound, var->value));
932 /** \brief Update the constraint set propagating recursively to
933 * other constraints so the system should not be entirely computed.
935 * \param sys the lmm_system_t
936 * \param cnst the lmm_constraint_t affected by the change
938 * A recursive algorithm to optimize the system recalculation selecting only
939 * constraints that have changed. Each constraint change is propagated
940 * to the list of constraints for each variable.
942 static void lmm_update_modified_set_rec(lmm_system_t sys,
943 lmm_constraint_t cnst)
947 xbt_swag_foreach(_elem, &cnst->element_set) {
948 lmm_variable_t var = ((lmm_element_t)_elem)->variable;
949 s_lmm_element_t *cnsts = var->cnsts;
951 for (i = 0; var->visited != sys->visited_counter
952 && i < var->cnsts_number ; i++) {
953 if (cnsts[i].constraint != cnst
954 && !xbt_swag_belongs(cnsts[i].constraint,
955 &sys->modified_constraint_set)) {
956 xbt_swag_insert(cnsts[i].constraint, &sys->modified_constraint_set);
957 lmm_update_modified_set_rec(sys, cnsts[i].constraint);
960 var->visited = sys->visited_counter;
964 static void lmm_update_modified_set(lmm_system_t sys,
965 lmm_constraint_t cnst)
967 /* nothing to do if selective update isn't active */
968 if (sys->selective_update_active
969 && !xbt_swag_belongs(cnst, &sys->modified_constraint_set)) {
970 xbt_swag_insert(cnst, &sys->modified_constraint_set);
971 lmm_update_modified_set_rec(sys, cnst);
975 /** \brief Remove all constraints of the modified_constraint_set.
977 * \param sys the lmm_system_t
979 static void lmm_remove_all_modified_set(lmm_system_t sys)
981 if (++sys->visited_counter == 1) {
982 /* the counter wrapped around, reset each variable->visited */
984 xbt_swag_foreach(_var, &sys->variable_set)
985 ((lmm_variable_t)_var)->visited = 0;
987 xbt_swag_reset(&sys->modified_constraint_set);
991 * Returns total resource load
993 * \param cnst the lmm_constraint_t associated to the resource
996 double lmm_constraint_get_usage(lmm_constraint_t cnst) {
998 xbt_swag_t elem_list = &(cnst->element_set);
1000 lmm_element_t elem = NULL;
1002 xbt_swag_foreach(_elem, elem_list) {
1003 elem = (lmm_element_t)_elem;
1004 /* 0-weighted elements (ie, sleep actions) are at the end of the swag and we don't want to consider them */
1005 if (elem->variable->weight <= 0)
1007 if ((elem->value > 0)) {
1009 usage += elem->value * elem->variable->value;
1010 else if (usage < elem->value * elem->variable->value)
1011 usage = elem->value * elem->variable->value;