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.h"
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 = 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 = 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 XBT_INLINE void lmm_constraint_shared(lmm_constraint_t cnst)
171 XBT_INLINE 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 = xbt_mallocator_get(sys->variable_mallocator);
208 var->id_int = Global_debug_id++;
209 var->cnsts = 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 XBT_INLINE 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 XBT_INLINE 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 XBT_INLINE double lmm_get_cnst_weight_from_var(lmm_system_t sys,
425 if (num < var->cnsts_number)
426 return (var->cnsts[num].value);
431 XBT_INLINE 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 = xbt_swag_getFirst(&(cnst->element_set));
444 *elem = xbt_swag_getNext(*elem, cnst->element_set.offset);
446 return (*elem)->variable;
451 XBT_INLINE void *lmm_constraint_id(lmm_constraint_t cnst)
456 XBT_INLINE 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 = 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;
489 lmm_element_t elem = NULL;
490 xbt_swag_t elem_list = NULL;
492 for(i = 0; i< saturated_constraint_set->pos; i++){
493 cnst = &cnst_light_tab[saturated_constraint_set->data[i]];
494 elem_list = &(cnst->cnst->active_element_set);
495 xbt_swag_foreach(elem, elem_list) {
496 if (elem->variable->weight <= 0)
498 if ((elem->value > 0))
499 xbt_swag_insert(elem->variable, &(sys->saturated_variable_set));
504 void lmm_print(lmm_system_t sys)
506 lmm_constraint_t cnst = NULL;
507 lmm_element_t elem = NULL;
508 lmm_variable_t var = NULL;
509 xbt_swag_t cnst_list = NULL;
510 xbt_swag_t var_list = NULL;
511 xbt_swag_t elem_list = NULL;
512 char print_buf[1024];
513 char *trace_buf = xbt_malloc0(sizeof(char));
516 /* Printing Objective */
517 var_list = &(sys->variable_set);
518 sprintf(print_buf, "MAX-MIN ( ");
520 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
521 strcat(trace_buf, print_buf);
522 xbt_swag_foreach(var, var_list) {
523 sprintf(print_buf, "'%d'(%f) ", var->id_int, var->weight);
525 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
526 strcat(trace_buf, print_buf);
528 sprintf(print_buf, ")");
530 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
531 strcat(trace_buf, print_buf);
532 XBT_DEBUG("%20s", trace_buf);
533 trace_buf[0] = '\000';
535 XBT_DEBUG("Constraints");
536 /* Printing Constraints */
537 cnst_list = &(sys->active_constraint_set);
538 xbt_swag_foreach(cnst, cnst_list) {
540 elem_list = &(cnst->element_set);
541 sprintf(print_buf, "\t");
543 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
544 strcat(trace_buf, print_buf);
545 sprintf(print_buf, "%s(",(cnst->shared)?"":"max");
547 xbt_realloc(trace_buf,
548 strlen(trace_buf) + strlen(print_buf) + 1);
549 strcat(trace_buf, print_buf);
550 xbt_swag_foreach(elem, elem_list) {
551 sprintf(print_buf, "%f.'%d'(%f) %s ", elem->value,
552 elem->variable->id_int, elem->variable->value,(cnst->shared)?"+":",");
554 xbt_realloc(trace_buf,
555 strlen(trace_buf) + strlen(print_buf) + 1);
556 strcat(trace_buf, print_buf);
558 sum += elem->value * elem->variable->value;
560 sum = MAX(sum,elem->value * elem->variable->value);
562 sprintf(print_buf, "0) <= %f ('%d')", cnst->bound, cnst->id_int);
564 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
565 strcat(trace_buf, print_buf);
568 sprintf(print_buf, " [MAX-Constraint]");
570 xbt_realloc(trace_buf,
571 strlen(trace_buf) + strlen(print_buf) + 1);
572 strcat(trace_buf, print_buf);
574 XBT_DEBUG("%s", trace_buf);
575 trace_buf[0] = '\000';
576 xbt_assert(!double_positive(sum - cnst->bound),
577 "Incorrect value (%f is not smaller than %f): %g",
578 sum, cnst->bound, sum - cnst->bound);
581 XBT_DEBUG("Variables");
582 /* Printing Result */
583 xbt_swag_foreach(var, var_list) {
584 if (var->bound > 0) {
585 XBT_DEBUG("'%d'(%f) : %f (<=%f)", var->id_int, var->weight, var->value,
587 xbt_assert(!double_positive(var->value - var->bound),
588 "Incorrect value (%f is not smaller than %f",
589 var->value, var->bound);
591 XBT_DEBUG("'%d'(%f) : %f", var->id_int, var->weight, var->value);
598 void lmm_solve(lmm_system_t sys)
600 lmm_variable_t var = NULL;
601 lmm_constraint_t cnst = NULL;
602 lmm_constraint_t cnst_next = NULL;
603 lmm_element_t elem = NULL;
604 xbt_swag_t cnst_list = NULL;
605 xbt_swag_t var_list = NULL;
606 xbt_swag_t elem_list = NULL;
607 double min_usage = -1;
608 double min_bound = -1;
610 if (!(sys->modified))
613 XBT_IN("(sys=%p)", sys);
616 * Compute Usage and store the variables that reach the maximum.
620 selective_update_active ? &(sys->modified_constraint_set) :
621 &(sys->active_constraint_set);
623 XBT_DEBUG("Active constraints : %d", xbt_swag_size(cnst_list));
624 /* Init: Only modified code portions */
625 xbt_swag_foreach(cnst, cnst_list) {
626 elem_list = &(cnst->element_set);
627 //XBT_DEBUG("Variable set : %d", xbt_swag_size(elem_list));
628 xbt_swag_foreach(elem, elem_list) {
629 var = elem->variable;
630 if (var->weight <= 0.0)
636 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));
637 int cnst_light_num = 0;
638 dyn_light_t saturated_constraint_set = xbt_new0(s_dyn_light_t,1);
639 saturated_constraint_set->size = 5;
640 saturated_constraint_set->data = xbt_new0(int, saturated_constraint_set->size);
642 xbt_swag_foreach_safe(cnst, cnst_next, cnst_list) {
644 cnst->remaining = cnst->bound;
645 if (cnst->remaining == 0)
648 elem_list = &(cnst->element_set);
649 xbt_swag_foreach(elem, elem_list) {
650 /* 0-weighted elements (ie, sleep actions) are at the end of the swag and we don't want to consider them */
651 if (elem->variable->weight <= 0)
653 if ((elem->value > 0)) {
655 cnst->usage += elem->value / elem->variable->weight;
656 else if (cnst->usage < elem->value / elem->variable->weight)
657 cnst->usage = elem->value / elem->variable->weight;
659 make_elem_active(elem);
661 xbt_swag_insert(elem->variable->id, sys->keep_track);
664 XBT_DEBUG("Constraint Usage '%d' : %f", cnst->id_int, cnst->usage);
665 /* Saturated constraints update */
667 if(cnst->usage > 0) {
668 cnst_light_tab[cnst_light_num].cnst = cnst;
669 cnst->cnst_light = &(cnst_light_tab[cnst_light_num]);
670 cnst_light_tab[cnst_light_num].remaining_over_usage = cnst->remaining / cnst->usage;
671 saturated_constraint_set_update(cnst_light_tab[cnst_light_num].remaining_over_usage,
672 cnst_light_num, saturated_constraint_set, &min_usage);
677 saturated_variable_set_update( cnst_light_tab,
678 saturated_constraint_set,
681 /* Saturated variables update */
684 /* Fix the variables that have to be */
685 var_list = &(sys->saturated_variable_set);
687 xbt_swag_foreach(var, var_list) {
688 if (var->weight <= 0.0)
690 /* First check if some of these variables have reach their upper
691 bound and update min_usage accordingly. */
693 ("var=%d, var->bound=%f, var->weight=%f, min_usage=%f, var->bound*var->weight=%f",
694 var->id_int, var->bound, var->weight, min_usage,
695 var->bound * var->weight);
696 if ((var->bound > 0) && (var->bound * var->weight < min_usage)) {
698 min_bound = var->bound;
700 min_bound = MIN(min_bound, var->bound);
701 XBT_DEBUG("Updated min_bound=%f", min_bound);
706 while ((var = xbt_swag_getFirst(var_list))) {
710 var->value = min_usage / var->weight;
712 if (min_bound == var->bound)
713 var->value = var->bound;
715 xbt_swag_remove(var, var_list);
719 XBT_DEBUG("Min usage: %f, Var(%d)->weight: %f, Var(%d)->value: %f ",
720 min_usage, var->id_int, var->weight, var->id_int, var->value);
725 for (i = 0; i < var->cnsts_number; i++) {
726 elem = &var->cnsts[i];
727 cnst = elem->constraint;
729 double_update(&(cnst->remaining), elem->value * var->value);
730 double_update(&(cnst->usage), elem->value / var->weight);
731 if(cnst->usage<=0 || cnst->remaining<=0) {
732 if (cnst->cnst_light) {
733 int index = (cnst->cnst_light-cnst_light_tab);
734 XBT_DEBUG("index: %d \t cnst_light_num: %d \t || \t cnst: %p \t cnst->cnst_light: %p \t cnst_light_tab: %p ",
735 index,cnst_light_num, cnst, cnst->cnst_light, cnst_light_tab);
736 cnst_light_tab[index]=cnst_light_tab[cnst_light_num-1];
737 cnst_light_tab[index].cnst->cnst_light = &cnst_light_tab[index];
739 cnst->cnst_light = NULL;
742 cnst->cnst_light->remaining_over_usage = cnst->remaining / cnst->usage;
744 make_elem_inactive(elem);
747 make_elem_inactive(elem);
748 elem_list = &(cnst->element_set);
749 xbt_swag_foreach(elem, elem_list) {
750 if (elem->variable->weight <= 0 || elem->variable->value > 0)
753 cnst->usage = MAX(cnst->usage, elem->value / elem->variable->weight);
755 if (cnst->usage<=0 || cnst->remaining<=0) {
756 if(cnst->cnst_light) {
757 int index = (cnst->cnst_light-cnst_light_tab);
758 XBT_DEBUG("index: %d \t cnst_light_num: %d \t || \t cnst: %p \t cnst->cnst_light: %p \t cnst_light_tab: %p ",
759 index,cnst_light_num, cnst, cnst->cnst_light, cnst_light_tab);
760 cnst_light_tab[index]=cnst_light_tab[cnst_light_num-1];
761 cnst_light_tab[index].cnst->cnst_light = &cnst_light_tab[index];
763 cnst->cnst_light = NULL;
766 cnst->cnst_light->remaining_over_usage = cnst->remaining / cnst->usage;
770 xbt_swag_remove(var, var_list);
773 /* Find out which variables reach the maximum */
776 saturated_constraint_set->pos = 0;
778 for(pos=0; pos<cnst_light_num; pos++)
779 saturated_constraint_set_update(
780 cnst_light_tab[pos].remaining_over_usage,
782 saturated_constraint_set,
785 saturated_variable_set_update( cnst_light_tab,
786 saturated_constraint_set,
789 } while (cnst_light_num > 0);
792 if (sys->selective_update_active)
793 lmm_remove_all_modified_set(sys);
795 if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
799 xbt_free(saturated_constraint_set->data);
800 xbt_free(saturated_constraint_set);
801 xbt_free(cnst_light_tab);
805 /* Not a O(1) function */
807 void lmm_update(lmm_system_t sys, lmm_constraint_t cnst,
808 lmm_variable_t var, double value)
812 for (i = 0; i < var->cnsts_number; i++)
813 if (var->cnsts[i].constraint == cnst) {
814 var->cnsts[i].value = value;
816 lmm_update_modified_set(sys, cnst);
821 /** \brief Attribute the value bound to var->bound.
823 * \param sys the lmm_system_t
824 * \param var the lmm_variable_t
825 * \param bound the new bound to associate with var
827 * Makes var->bound equal to bound. Whenever this function is called
828 * a change is signed in the system. To
829 * avoid false system changing detection it is a good idea to test
830 * (bound != 0) before calling it.
833 void lmm_update_variable_bound(lmm_system_t sys, lmm_variable_t var,
839 if (var->cnsts_number)
840 lmm_update_modified_set(sys, var->cnsts[0].constraint);
844 void lmm_update_variable_weight(lmm_system_t sys, lmm_variable_t var,
850 if (weight == var->weight)
852 XBT_IN("(sys=%p, var=%p, weight=%f)", sys, var, weight);
854 var->weight = weight;
855 xbt_swag_remove(var, &(sys->variable_set));
857 xbt_swag_insert_at_head(var, &(sys->variable_set));
859 xbt_swag_insert_at_tail(var, &(sys->variable_set));
861 for (i = 0; i < var->cnsts_number; i++) {
862 elem = &var->cnsts[i];
863 xbt_swag_remove(elem, &(elem->constraint->element_set));
865 xbt_swag_insert_at_head(elem, &(elem->constraint->element_set));
867 xbt_swag_insert_at_tail(elem, &(elem->constraint->element_set));
870 lmm_update_modified_set(sys, elem->constraint);
878 XBT_INLINE double lmm_get_variable_weight(lmm_variable_t var)
883 XBT_INLINE void lmm_update_constraint_bound(lmm_system_t sys,
884 lmm_constraint_t cnst,
888 lmm_update_modified_set(sys, cnst);
892 XBT_INLINE int lmm_constraint_used(lmm_system_t sys, lmm_constraint_t cnst)
894 return xbt_swag_belongs(cnst, &(sys->active_constraint_set));
897 XBT_INLINE lmm_constraint_t lmm_get_first_active_constraint(lmm_system_t
900 return xbt_swag_getFirst(&(sys->active_constraint_set));
903 XBT_INLINE lmm_constraint_t lmm_get_next_active_constraint(lmm_system_t
908 return xbt_swag_getNext(cnst, (sys->active_constraint_set).offset);
911 #ifdef HAVE_LATENCY_BOUND_TRACKING
912 XBT_INLINE int lmm_is_variable_limited_by_latency(lmm_variable_t var)
914 return (double_equals(var->bound, var->value));
919 /** \brief Update the constraint set propagating recursively to
920 * other constraints so the system should not be entirely computed.
922 * \param sys the lmm_system_t
923 * \param cnst the lmm_constraint_t affected by the change
925 * A recursive algorithm to optimize the system recalculation selecting only
926 * constraints that have changed. Each constraint change is propagated
927 * to the list of constraints for each variable.
929 static void lmm_update_modified_set_rec(lmm_system_t sys,
930 lmm_constraint_t cnst)
934 xbt_swag_foreach(elem, &cnst->element_set) {
935 lmm_variable_t var = elem->variable;
936 s_lmm_element_t *cnsts = var->cnsts;
938 for (i = 0; var->visited != sys->visited_counter
939 && i < var->cnsts_number ; i++) {
940 if (cnsts[i].constraint != cnst
941 && !xbt_swag_belongs(cnsts[i].constraint,
942 &sys->modified_constraint_set)) {
943 xbt_swag_insert(cnsts[i].constraint, &sys->modified_constraint_set);
944 lmm_update_modified_set_rec(sys, cnsts[i].constraint);
947 var->visited = sys->visited_counter;
951 static void lmm_update_modified_set(lmm_system_t sys,
952 lmm_constraint_t cnst)
954 /* nothing to do if selective update isn't active */
955 if (sys->selective_update_active
956 && !xbt_swag_belongs(cnst, &sys->modified_constraint_set)) {
957 xbt_swag_insert(cnst, &sys->modified_constraint_set);
958 lmm_update_modified_set_rec(sys, cnst);
962 /** \brief Remove all constraints of the modified_constraint_set.
964 * \param sys the lmm_system_t
966 static void lmm_remove_all_modified_set(lmm_system_t sys)
968 if (++sys->visited_counter == 1) {
969 /* the counter wrapped around, reset each variable->visited */
971 xbt_swag_foreach(var, &sys->variable_set)
974 xbt_swag_reset(&sys->modified_constraint_set);
978 * Returns total resource load
980 * \param cnst the lmm_constraint_t associated to the resource
983 double lmm_constraint_get_usage(lmm_constraint_t cnst) {
985 xbt_swag_t elem_list = &(cnst->element_set);
986 lmm_element_t elem = NULL;
988 xbt_swag_foreach(elem, elem_list) {
989 /* 0-weighted elements (ie, sleep actions) are at the end of the swag and we don't want to consider them */
990 if (elem->variable->weight <= 0)
992 if ((elem->value > 0)) {
994 usage += elem->value * elem->variable->value;
995 else if (usage < elem->value * elem->variable->value)
996 usage = elem->value * elem->variable->value;