1 /* Copyright (c) 2004-2014. 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. */
7 #include "xbt/sysdep.h"
9 #include "xbt/mallocator.h"
10 #include "maxmin_private.hpp"
12 #include <stdio.h> /* sprintf */
14 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_maxmin, surf,
15 "Logging specific to SURF (maxmin)");
17 typedef struct s_dyn_light {
21 } s_dyn_light_t, *dyn_light_t;
23 XBT_EXPORT_NO_IMPORT(double) sg_maxmin_precision = 0.00001;
25 static void *lmm_variable_mallocator_new_f(void);
26 static void lmm_variable_mallocator_free_f(void *var);
27 #define lmm_variable_mallocator_reset_f ((void_f_pvoid_t)NULL)
28 static void lmm_update_modified_set(lmm_system_t sys,
29 lmm_constraint_t cnst);
30 static void lmm_remove_all_modified_set(lmm_system_t sys);
31 static int Global_debug_id = 1;
32 static int Global_const_debug_id = 1;
34 static void lmm_var_free(lmm_system_t sys, lmm_variable_t var);
35 static XBT_INLINE void lmm_cnst_free(lmm_system_t sys,
36 lmm_constraint_t cnst);
38 lmm_system_t lmm_system_new(int selective_update)
40 lmm_system_t l = NULL;
42 s_lmm_constraint_t cnst;
44 l = xbt_new0(s_lmm_system_t, 1);
47 l->selective_update_active = selective_update;
48 l->visited_counter = 1;
50 XBT_DEBUG("Setting selective_update_active flag to %d\n",
51 l->selective_update_active);
53 xbt_swag_init(&(l->variable_set),
54 xbt_swag_offset(var, variable_set_hookup));
55 xbt_swag_init(&(l->constraint_set),
56 xbt_swag_offset(cnst, constraint_set_hookup));
58 xbt_swag_init(&(l->active_constraint_set),
59 xbt_swag_offset(cnst, active_constraint_set_hookup));
61 xbt_swag_init(&(l->modified_constraint_set),
62 xbt_swag_offset(cnst, modified_constraint_set_hookup));
63 xbt_swag_init(&(l->saturated_variable_set),
64 xbt_swag_offset(var, saturated_variable_set_hookup));
65 xbt_swag_init(&(l->saturated_constraint_set),
66 xbt_swag_offset(cnst, saturated_constraint_set_hookup));
68 l->variable_mallocator = xbt_mallocator_new(65536,
69 lmm_variable_mallocator_new_f,
70 lmm_variable_mallocator_free_f,
71 lmm_variable_mallocator_reset_f);
76 void lmm_system_free(lmm_system_t sys)
78 lmm_variable_t var = NULL;
79 lmm_constraint_t cnst = NULL;
81 while ((var = (lmm_variable_t) extract_variable(sys))) {
83 ("Variable %p (%d) still in LMM system when freing it: this may be a bug",
85 lmm_var_free(sys, var);
88 while ((cnst = (lmm_constraint_t) extract_constraint(sys)))
89 lmm_cnst_free(sys, cnst);
91 xbt_mallocator_free(sys->variable_mallocator);
95 static XBT_INLINE void lmm_variable_disable(lmm_system_t sys, lmm_variable_t var)
100 lmm_element_t elem = NULL;
102 XBT_IN("(sys=%p, var=%p)", sys, var);
106 for (i = 0; i < var->cnsts_number; i++) {
107 elem = &var->cnsts[i];
108 xbt_swag_remove(elem, &(elem->constraint->element_set));
109 xbt_swag_remove(elem, &(elem->constraint->active_element_set));
110 if (!xbt_swag_size(&(elem->constraint->element_set)))
111 make_constraint_inactive(sys, elem->constraint);
114 var->cnsts[n].constraint = elem->constraint;
119 var->cnsts_number = n;
120 lmm_update_modified_set(sys, var->cnsts[0].constraint);
123 var->cnsts_number = 0;
127 static void lmm_var_free(lmm_system_t sys, lmm_variable_t var)
130 lmm_variable_disable(sys, var);
131 xbt_mallocator_release(sys->variable_mallocator, var);
134 static XBT_INLINE void lmm_cnst_free(lmm_system_t sys,
135 lmm_constraint_t cnst)
137 /* xbt_assert(xbt_swag_size(&(cnst->element_set)), */
138 /* "This list should be empty!"); */
139 make_constraint_inactive(sys, cnst);
143 lmm_constraint_t lmm_constraint_new(lmm_system_t sys, void *id,
146 lmm_constraint_t cnst = NULL;
147 s_lmm_element_t elem;
149 cnst = xbt_new0(s_lmm_constraint_t, 1);
151 cnst->id_int = Global_const_debug_id++;
152 xbt_swag_init(&(cnst->element_set),
153 xbt_swag_offset(elem, element_set_hookup));
154 xbt_swag_init(&(cnst->active_element_set),
155 xbt_swag_offset(elem, active_element_set_hookup));
157 cnst->bound = bound_value;
160 insert_constraint(sys, cnst);
165 void lmm_constraint_shared(lmm_constraint_t cnst)
170 int lmm_constraint_is_shared(lmm_constraint_t cnst)
172 return (cnst->shared);
175 XBT_INLINE void lmm_constraint_free(lmm_system_t sys,
176 lmm_constraint_t cnst)
178 remove_constraint(sys, cnst);
179 lmm_cnst_free(sys, cnst);
182 static void *lmm_variable_mallocator_new_f(void)
184 lmm_variable_t var = xbt_new(s_lmm_variable_t, 1);
185 var->cnsts = NULL; /* will be created by realloc */
189 static void lmm_variable_mallocator_free_f(void *var)
191 xbt_free(((lmm_variable_t) var)->cnsts);
195 lmm_variable_t lmm_variable_new(lmm_system_t sys, void *id,
197 double bound, int number_of_constraints)
199 lmm_variable_t var = NULL;
202 XBT_IN("(sys=%p, id=%p, weight=%f, bound=%f, num_cons =%d)",
203 sys, id, weight, bound, number_of_constraints);
205 var = (lmm_variable_t) xbt_mallocator_get(sys->variable_mallocator);
207 var->id_int = Global_debug_id++;
208 var->cnsts = (s_lmm_element_t *) xbt_realloc(var->cnsts, number_of_constraints * sizeof(s_lmm_element_t));
209 for (i = 0; i < number_of_constraints; i++) {
210 var->cnsts[i].element_set_hookup.next = NULL;
211 var->cnsts[i].element_set_hookup.prev = NULL;
212 var->cnsts[i].active_element_set_hookup.next = NULL;
213 var->cnsts[i].active_element_set_hookup.prev = NULL;
214 var->cnsts[i].constraint = NULL;
215 var->cnsts[i].variable = NULL;
216 var->cnsts[i].value = 0.0;
218 var->cnsts_size = number_of_constraints;
219 var->cnsts_number = 0;
220 var->weight = weight;
223 var->visited = sys->visited_counter - 1;
226 var->func_f = func_f_def;
227 var->func_fp = func_fp_def;
228 var->func_fpi = func_fpi_def;
230 var->variable_set_hookup.next = NULL;
231 var->variable_set_hookup.prev = NULL;
232 var->saturated_variable_set_hookup.next = NULL;
233 var->saturated_variable_set_hookup.prev = NULL;
236 xbt_swag_insert_at_head(var, &(sys->variable_set));
238 xbt_swag_insert_at_tail(var, &(sys->variable_set));
240 XBT_OUT(" returns %p", var);
244 void lmm_variable_free(lmm_system_t sys, lmm_variable_t var)
246 remove_variable(sys, var);
247 lmm_var_free(sys, var);
250 double lmm_variable_getvalue(lmm_variable_t var)
255 double lmm_variable_getbound(lmm_variable_t var)
260 /* Replace the content of elem_a with elem_b. The content of elem_b is cleared. */
261 static void renew_elem_entry(lmm_element_t elem_a, lmm_element_t elem_b)
263 elem_a->constraint = elem_b->constraint;
264 elem_a->variable = elem_b->variable;
265 elem_a->value = elem_b->value;
267 /* If elem_b is in the element_set swag, register the new element to the swag. */
268 if (xbt_swag_remove(elem_b, &(elem_b->constraint->element_set))) {
269 if (elem_a->variable->weight)
270 xbt_swag_insert_at_head(elem_a, &(elem_a->constraint->element_set));
272 xbt_swag_insert_at_tail(elem_a, &(elem_a->constraint->element_set));
275 if (xbt_swag_remove(elem_b, &(elem_b->constraint->active_element_set))) {
276 if (elem_a->variable->weight)
277 xbt_swag_insert_at_head(elem_a, &(elem_a->constraint->active_element_set));
279 xbt_swag_insert_at_tail(elem_a, &(elem_a->constraint->active_element_set));
282 elem_b->constraint = NULL;
283 elem_b->variable = NULL;
287 void lmm_shrink(lmm_system_t sys, lmm_constraint_t cnst,
290 lmm_element_t elem = NULL;
294 for (i = 0; i < var->cnsts_number; i++) {
295 elem = &(var->cnsts[i]);
296 if (elem->constraint == cnst) {
303 XBT_DEBUG("cnst %p is not found in var %p", cnst, var);
309 XBT_DEBUG("remove elem(value %f, cnst %p, var %p) in var %p",
310 elem->value, elem->constraint, elem->variable, var);
314 /* We are going to change the constraint object and the variable object.
315 * Propagate this change to other objects. Calling here (not after
316 * modification) is correct? */
317 lmm_update_modified_set(sys, cnst);
318 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].
322 /* now var->cnsts[i] is not necessary any more */
324 xbt_swag_remove(elem, &(elem->constraint->element_set));
325 xbt_swag_remove(elem, &(elem->constraint->active_element_set));
326 elem->constraint = NULL;
327 elem->variable = NULL;
332 /* We do not want to have an empty element entry before the last entry. So,
333 * plug up the hole with the last one. */
334 if (i < var->cnsts_number - 1)
335 renew_elem_entry(&var->cnsts[i], &var->cnsts[var->cnsts_number - 1]);
337 var->cnsts_number -= 1;
340 if (xbt_swag_size(&(cnst->element_set)) == 0)
341 make_constraint_inactive(sys, cnst);
344 void lmm_expand(lmm_system_t sys, lmm_constraint_t cnst,
345 lmm_variable_t var, double value)
347 lmm_element_t elem = NULL;
351 xbt_assert(var->cnsts_number < var->cnsts_size, "Too much constraints");
353 elem = &(var->cnsts[var->cnsts_number++]);
356 elem->constraint = cnst;
357 elem->variable = var;
360 xbt_swag_insert_at_head(elem, &(elem->constraint->element_set));
362 xbt_swag_insert_at_tail(elem, &(elem->constraint->element_set));
363 if(!sys->selective_update_active) {
364 make_constraint_active(sys, cnst);
365 } else if(elem->value>0 || var->weight >0) {
366 make_constraint_active(sys, cnst);
367 lmm_update_modified_set(sys, cnst);
368 if (var->cnsts_number > 1)
369 lmm_update_modified_set(sys, var->cnsts[0].constraint);
373 void lmm_expand_add(lmm_system_t sys, lmm_constraint_t cnst,
374 lmm_variable_t var, double value)
379 for (i = 0; i < var->cnsts_number; i++)
380 if (var->cnsts[i].constraint == cnst)
383 if (i < var->cnsts_number) {
385 var->cnsts[i].value += value;
387 var->cnsts[i].value = MAX(var->cnsts[i].value, value);
388 lmm_update_modified_set(sys, cnst);
390 lmm_expand(sys, cnst, var, value);
393 lmm_constraint_t lmm_get_cnst_from_var(lmm_system_t /*sys*/,
397 if (num < var->cnsts_number)
398 return (var->cnsts[num].constraint);
403 double lmm_get_cnst_weight_from_var(lmm_system_t /*sys*/,
407 if (num < var->cnsts_number)
408 return (var->cnsts[num].value);
413 int lmm_get_number_of_cnst_from_var(lmm_system_t /*sys*/,
416 return (var->cnsts_number);
419 lmm_variable_t lmm_get_var_from_cnst(lmm_system_t /*sys*/,
420 lmm_constraint_t cnst,
421 lmm_element_t * elem)
424 *elem = (lmm_element_t) xbt_swag_getFirst(&(cnst->element_set));
426 *elem = (lmm_element_t) xbt_swag_getNext(*elem, cnst->element_set.offset);
428 return (*elem)->variable;
433 void *lmm_constraint_id(lmm_constraint_t cnst)
438 void *lmm_variable_id(lmm_variable_t var)
443 static XBT_INLINE void saturated_constraint_set_update(double usage,
445 dyn_light_t saturated_constraint_set,
448 xbt_assert(usage > 0,"Impossible");
450 if (*min_usage < 0 || *min_usage > usage) {
452 // XBT_HERE(" min_usage=%f (cnst->remaining / cnst->usage =%f)", *min_usage, usage);
453 saturated_constraint_set->data[0] = cnst_light_num;
454 saturated_constraint_set->pos = 1;
455 } else if (*min_usage == usage) {
456 if(saturated_constraint_set->pos == saturated_constraint_set->size) { // realloc the size
457 saturated_constraint_set->size *= 2;
458 saturated_constraint_set->data = (int*) xbt_realloc(saturated_constraint_set->data, (saturated_constraint_set->size) * sizeof(int));
460 saturated_constraint_set->data[saturated_constraint_set->pos] = cnst_light_num;
461 saturated_constraint_set->pos++;
465 static XBT_INLINE void saturated_variable_set_update(
466 s_lmm_constraint_light_t *cnst_light_tab,
467 dyn_light_t saturated_constraint_set,
470 lmm_constraint_light_t cnst = NULL;
472 lmm_element_t elem = NULL;
473 xbt_swag_t elem_list = NULL;
475 for(i = 0; i< saturated_constraint_set->pos; i++){
476 cnst = &cnst_light_tab[saturated_constraint_set->data[i]];
477 elem_list = &(cnst->cnst->active_element_set);
478 xbt_swag_foreach(_elem, elem_list) {
479 elem = (lmm_element_t)_elem;
480 if (elem->variable->weight <= 0)
482 if ((elem->value > 0))
483 xbt_swag_insert(elem->variable, &(sys->saturated_variable_set));
488 void lmm_print(lmm_system_t sys)
490 void *_cnst, *_elem, *_var;
491 lmm_constraint_t cnst = NULL;
492 lmm_element_t elem = NULL;
493 lmm_variable_t var = NULL;
494 xbt_swag_t cnst_list = NULL;
495 xbt_swag_t var_list = NULL;
496 xbt_swag_t elem_list = NULL;
497 char print_buf[1024];
498 char *trace_buf = (char*) xbt_malloc0(sizeof(char));
501 /* Printing Objective */
502 var_list = &(sys->variable_set);
503 sprintf(print_buf, "MAX-MIN ( ");
505 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
506 strcat(trace_buf, print_buf);
507 xbt_swag_foreach(_var, var_list) {
508 var = (lmm_variable_t)_var;
509 sprintf(print_buf, "'%d'(%f) ", var->id_int, var->weight);
511 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
512 strcat(trace_buf, print_buf);
514 sprintf(print_buf, ")");
516 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
517 strcat(trace_buf, print_buf);
518 XBT_DEBUG("%20s", trace_buf);
519 trace_buf[0] = '\000';
521 XBT_DEBUG("Constraints");
522 /* Printing Constraints */
523 cnst_list = &(sys->active_constraint_set);
524 xbt_swag_foreach(_cnst, cnst_list) {
525 cnst = (lmm_constraint_t)_cnst;
527 elem_list = &(cnst->element_set);
528 sprintf(print_buf, "\t");
530 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
531 strcat(trace_buf, print_buf);
532 sprintf(print_buf, "%s(",(cnst->shared)?"":"max");
534 xbt_realloc(trace_buf,
535 strlen(trace_buf) + strlen(print_buf) + 1);
536 strcat(trace_buf, print_buf);
537 xbt_swag_foreach(_elem, elem_list) {
538 elem = (lmm_element_t)_elem;
539 sprintf(print_buf, "%f.'%d'(%f) %s ", elem->value,
540 elem->variable->id_int, elem->variable->value,(cnst->shared)?"+":",");
542 xbt_realloc(trace_buf,
543 strlen(trace_buf) + strlen(print_buf) + 1);
544 strcat(trace_buf, print_buf);
546 sum += elem->value * elem->variable->value;
548 sum = MAX(sum,elem->value * elem->variable->value);
550 sprintf(print_buf, "0) <= %f ('%d')", cnst->bound, cnst->id_int);
552 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
553 strcat(trace_buf, print_buf);
556 sprintf(print_buf, " [MAX-Constraint]");
558 xbt_realloc(trace_buf,
559 strlen(trace_buf) + strlen(print_buf) + 1);
560 strcat(trace_buf, print_buf);
562 XBT_DEBUG("%s", trace_buf);
563 trace_buf[0] = '\000';
564 xbt_assert(!double_positive(sum - cnst->bound),
565 "Incorrect value (%f is not smaller than %f): %g",
566 sum, cnst->bound, sum - cnst->bound);
569 XBT_DEBUG("Variables");
570 /* Printing Result */
571 xbt_swag_foreach(_var, var_list) {
572 var = (lmm_variable_t)_var;
573 if (var->bound > 0) {
574 XBT_DEBUG("'%d'(%f) : %f (<=%f)", var->id_int, var->weight, var->value,
576 xbt_assert(!double_positive(var->value - var->bound),
577 "Incorrect value (%f is not smaller than %f",
578 var->value, var->bound);
580 XBT_DEBUG("'%d'(%f) : %f", var->id_int, var->weight, var->value);
587 void lmm_solve(lmm_system_t sys)
589 void *_var, *_cnst, *_cnst_next, *_elem;
590 lmm_variable_t var = NULL;
591 lmm_constraint_t cnst = NULL;
592 lmm_element_t elem = NULL;
593 xbt_swag_t cnst_list = NULL;
594 xbt_swag_t var_list = NULL;
595 xbt_swag_t elem_list = NULL;
596 double min_usage = -1;
597 double min_bound = -1;
599 if (!(sys->modified))
602 XBT_IN("(sys=%p)", sys);
605 * Compute Usage and store the variables that reach the maximum.
609 selective_update_active ? &(sys->modified_constraint_set) :
610 &(sys->active_constraint_set);
612 XBT_DEBUG("Active constraints : %d", xbt_swag_size(cnst_list));
613 /* Init: Only modified code portions */
614 xbt_swag_foreach(_cnst, cnst_list) {
615 cnst = (lmm_constraint_t)_cnst;
616 elem_list = &(cnst->element_set);
617 //XBT_DEBUG("Variable set : %d", xbt_swag_size(elem_list));
618 xbt_swag_foreach(_elem, elem_list) {
619 var = ((lmm_element_t)_elem)->variable;
620 if (var->weight <= 0.0)
626 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));
627 int cnst_light_num = 0;
628 dyn_light_t saturated_constraint_set = xbt_new0(s_dyn_light_t,1);
629 saturated_constraint_set->size = 5;
630 saturated_constraint_set->data = xbt_new0(int, saturated_constraint_set->size);
632 xbt_swag_foreach_safe(_cnst, _cnst_next, cnst_list) {
633 cnst = (lmm_constraint_t)_cnst;
635 cnst->remaining = cnst->bound;
636 if (cnst->remaining == 0)
639 elem_list = &(cnst->element_set);
640 xbt_swag_foreach(_elem, elem_list) {
641 elem = (lmm_element_t)_elem;
642 /* 0-weighted elements (ie, sleep actions) are at the end of the swag and we don't want to consider them */
643 if (elem->variable->weight <= 0)
645 if ((elem->value > 0)) {
647 cnst->usage += elem->value / elem->variable->weight;
648 else if (cnst->usage < elem->value / elem->variable->weight)
649 cnst->usage = elem->value / elem->variable->weight;
651 make_elem_active(elem);
652 ActionPtr action = static_cast<ActionPtr>(elem->variable->id);
653 if (sys->keep_track && !action->is_linked())
654 sys->keep_track->push_back(*action);
657 XBT_DEBUG("Constraint Usage '%d' : %f", cnst->id_int, cnst->usage);
658 /* Saturated constraints update */
660 if(cnst->usage > 0) {
661 cnst_light_tab[cnst_light_num].cnst = cnst;
662 cnst->cnst_light = &(cnst_light_tab[cnst_light_num]);
663 cnst_light_tab[cnst_light_num].remaining_over_usage = cnst->remaining / cnst->usage;
664 saturated_constraint_set_update(cnst_light_tab[cnst_light_num].remaining_over_usage,
665 cnst_light_num, saturated_constraint_set, &min_usage);
670 saturated_variable_set_update( cnst_light_tab,
671 saturated_constraint_set,
674 /* Saturated variables update */
677 /* Fix the variables that have to be */
678 var_list = &(sys->saturated_variable_set);
680 xbt_swag_foreach(_var, var_list) {
681 var = (lmm_variable_t)_var;
682 if (var->weight <= 0.0)
684 /* First check if some of these variables have reach their upper
685 bound and update min_usage accordingly. */
687 ("var=%d, var->bound=%f, var->weight=%f, min_usage=%f, var->bound*var->weight=%f",
688 var->id_int, var->bound, var->weight, min_usage,
689 var->bound * var->weight);
690 if ((var->bound > 0) && (var->bound * var->weight < min_usage)) {
692 min_bound = var->bound;
694 min_bound = MIN(min_bound, var->bound);
695 XBT_DEBUG("Updated min_bound=%f", min_bound);
700 while ((var = (lmm_variable_t)xbt_swag_getFirst(var_list))) {
704 var->value = min_usage / var->weight;
706 if (min_bound == var->bound)
707 var->value = var->bound;
709 xbt_swag_remove(var, var_list);
713 XBT_DEBUG("Min usage: %f, Var(%d)->weight: %f, Var(%d)->value: %f ",
714 min_usage, var->id_int, var->weight, var->id_int, var->value);
719 for (i = 0; i < var->cnsts_number; i++) {
720 elem = &var->cnsts[i];
721 cnst = elem->constraint;
723 double_update(&(cnst->remaining), elem->value * var->value);
724 double_update(&(cnst->usage), elem->value / var->weight);
725 if(cnst->usage<=0 || cnst->remaining<=0) {
726 if (cnst->cnst_light) {
727 int index = (cnst->cnst_light-cnst_light_tab);
728 XBT_DEBUG("index: %d \t cnst_light_num: %d \t || \t cnst: %p \t cnst->cnst_light: %p \t cnst_light_tab: %p ",
729 index,cnst_light_num, cnst, cnst->cnst_light, cnst_light_tab);
730 cnst_light_tab[index]=cnst_light_tab[cnst_light_num-1];
731 cnst_light_tab[index].cnst->cnst_light = &cnst_light_tab[index];
733 cnst->cnst_light = NULL;
736 cnst->cnst_light->remaining_over_usage = cnst->remaining / cnst->usage;
738 make_elem_inactive(elem);
741 make_elem_inactive(elem);
742 elem_list = &(cnst->element_set);
743 xbt_swag_foreach(_elem, elem_list) {
744 elem = (lmm_element_t)_elem;
745 if (elem->variable->weight <= 0 || elem->variable->value > 0)
748 cnst->usage = MAX(cnst->usage, elem->value / elem->variable->weight);
750 if (cnst->usage<=0 || cnst->remaining<=0) {
751 if(cnst->cnst_light) {
752 int index = (cnst->cnst_light-cnst_light_tab);
753 XBT_DEBUG("index: %d \t cnst_light_num: %d \t || \t cnst: %p \t cnst->cnst_light: %p \t cnst_light_tab: %p ",
754 index,cnst_light_num, cnst, cnst->cnst_light, cnst_light_tab);
755 cnst_light_tab[index]=cnst_light_tab[cnst_light_num-1];
756 cnst_light_tab[index].cnst->cnst_light = &cnst_light_tab[index];
758 cnst->cnst_light = NULL;
761 cnst->cnst_light->remaining_over_usage = cnst->remaining / cnst->usage;
765 xbt_swag_remove(var, var_list);
768 /* Find out which variables reach the maximum */
771 saturated_constraint_set->pos = 0;
773 for(pos=0; pos<cnst_light_num; pos++)
774 saturated_constraint_set_update(
775 cnst_light_tab[pos].remaining_over_usage,
777 saturated_constraint_set,
780 saturated_variable_set_update( cnst_light_tab,
781 saturated_constraint_set,
784 } while (cnst_light_num > 0);
787 if (sys->selective_update_active)
788 lmm_remove_all_modified_set(sys);
790 if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
794 xbt_free(saturated_constraint_set->data);
795 xbt_free(saturated_constraint_set);
796 xbt_free(cnst_light_tab);
800 /* Not a O(1) function */
802 void lmm_update(lmm_system_t sys, lmm_constraint_t cnst,
803 lmm_variable_t var, double value)
807 for (i = 0; i < var->cnsts_number; i++)
808 if (var->cnsts[i].constraint == cnst) {
809 var->cnsts[i].value = value;
811 lmm_update_modified_set(sys, cnst);
816 /** \brief Attribute the value bound to var->bound.
818 * \param sys the lmm_system_t
819 * \param var the lmm_variable_t
820 * \param bound the new bound to associate with var
822 * Makes var->bound equal to bound. Whenever this function is called
823 * a change is signed in the system. To
824 * avoid false system changing detection it is a good idea to test
825 * (bound != 0) before calling it.
828 void lmm_update_variable_bound(lmm_system_t sys, lmm_variable_t var,
834 if (var->cnsts_number)
835 lmm_update_modified_set(sys, var->cnsts[0].constraint);
839 void lmm_update_variable_weight(lmm_system_t sys, lmm_variable_t var,
845 if (weight == var->weight)
847 XBT_IN("(sys=%p, var=%p, weight=%f)", sys, var, weight);
849 var->weight = weight;
850 xbt_swag_remove(var, &(sys->variable_set));
852 xbt_swag_insert_at_head(var, &(sys->variable_set));
854 xbt_swag_insert_at_tail(var, &(sys->variable_set));
856 for (i = 0; i < var->cnsts_number; i++) {
857 elem = &var->cnsts[i];
858 xbt_swag_remove(elem, &(elem->constraint->element_set));
860 xbt_swag_insert_at_head(elem, &(elem->constraint->element_set));
862 xbt_swag_insert_at_tail(elem, &(elem->constraint->element_set));
865 lmm_update_modified_set(sys, elem->constraint);
873 double lmm_get_variable_weight(lmm_variable_t var)
878 void lmm_update_constraint_bound(lmm_system_t sys,
879 lmm_constraint_t cnst,
883 lmm_update_modified_set(sys, cnst);
887 int lmm_constraint_used(lmm_system_t sys, lmm_constraint_t cnst)
889 return xbt_swag_belongs(cnst, &(sys->active_constraint_set));
892 XBT_INLINE lmm_constraint_t lmm_get_first_active_constraint(lmm_system_t
895 return (lmm_constraint_t)xbt_swag_getFirst(&(sys->active_constraint_set));
898 XBT_INLINE lmm_constraint_t lmm_get_next_active_constraint(lmm_system_t
903 return (lmm_constraint_t)xbt_swag_getNext(cnst, (sys->active_constraint_set).offset);
906 #ifdef HAVE_LATENCY_BOUND_TRACKING
907 XBT_INLINE int lmm_is_variable_limited_by_latency(lmm_variable_t var)
909 return (double_equals(var->bound, var->value));
914 /** \brief Update the constraint set propagating recursively to
915 * other constraints so the system should not be entirely computed.
917 * \param sys the lmm_system_t
918 * \param cnst the lmm_constraint_t affected by the change
920 * A recursive algorithm to optimize the system recalculation selecting only
921 * constraints that have changed. Each constraint change is propagated
922 * to the list of constraints for each variable.
924 static void lmm_update_modified_set_rec(lmm_system_t sys,
925 lmm_constraint_t cnst)
929 xbt_swag_foreach(_elem, &cnst->element_set) {
930 lmm_variable_t var = ((lmm_element_t)_elem)->variable;
931 s_lmm_element_t *cnsts = var->cnsts;
933 for (i = 0; var->visited != sys->visited_counter
934 && i < var->cnsts_number ; i++) {
935 if (cnsts[i].constraint != cnst
936 && !xbt_swag_belongs(cnsts[i].constraint,
937 &sys->modified_constraint_set)) {
938 xbt_swag_insert(cnsts[i].constraint, &sys->modified_constraint_set);
939 lmm_update_modified_set_rec(sys, cnsts[i].constraint);
942 var->visited = sys->visited_counter;
946 static void lmm_update_modified_set(lmm_system_t sys,
947 lmm_constraint_t cnst)
949 /* nothing to do if selective update isn't active */
950 if (sys->selective_update_active
951 && !xbt_swag_belongs(cnst, &sys->modified_constraint_set)) {
952 xbt_swag_insert(cnst, &sys->modified_constraint_set);
953 lmm_update_modified_set_rec(sys, cnst);
957 /** \brief Remove all constraints of the modified_constraint_set.
959 * \param sys the lmm_system_t
961 static void lmm_remove_all_modified_set(lmm_system_t sys)
963 if (++sys->visited_counter == 1) {
964 /* the counter wrapped around, reset each variable->visited */
966 xbt_swag_foreach(_var, &sys->variable_set)
967 ((lmm_variable_t)_var)->visited = 0;
969 xbt_swag_reset(&sys->modified_constraint_set);
973 * Returns total resource load
975 * \param cnst the lmm_constraint_t associated to the resource
978 double lmm_constraint_get_usage(lmm_constraint_t cnst) {
980 xbt_swag_t elem_list = &(cnst->element_set);
982 lmm_element_t elem = NULL;
984 xbt_swag_foreach(_elem, elem_list) {
985 elem = (lmm_element_t)_elem;
986 /* 0-weighted elements (ie, sleep actions) are at the end of the swag and we don't want to consider them */
987 if (elem->variable->weight <= 0)
989 if ((elem->value > 0)) {
991 usage += elem->value * elem->variable->value;
992 else if (usage < elem->value * elem->variable->value)
993 usage = elem->value * elem->variable->value;