1 /* Copyright (c) 2004-2015. 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 double sg_maxmin_precision = 0.00001;
24 double sg_surf_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",
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;
160 cnst->sharing_policy = 1; /* FIXME: don't hardcode the value */
161 insert_constraint(sys, cnst);
166 void lmm_constraint_shared(lmm_constraint_t cnst)
168 cnst->sharing_policy = 0;
171 /** Return true if the constraint is shared, and false if it's FATPIPE */
172 int lmm_constraint_sharing_policy(lmm_constraint_t cnst)
174 return (cnst->sharing_policy);
177 XBT_INLINE void lmm_constraint_free(lmm_system_t sys,
178 lmm_constraint_t cnst)
180 remove_constraint(sys, cnst);
181 lmm_cnst_free(sys, cnst);
184 static void *lmm_variable_mallocator_new_f(void)
186 lmm_variable_t var = xbt_new(s_lmm_variable_t, 1);
187 var->cnsts = NULL; /* will be created by realloc */
191 static void lmm_variable_mallocator_free_f(void *var)
193 xbt_free(((lmm_variable_t) var)->cnsts);
197 lmm_variable_t lmm_variable_new(lmm_system_t sys, void *id,
199 double bound, int number_of_constraints)
201 lmm_variable_t var = NULL;
204 XBT_IN("(sys=%p, id=%p, weight=%f, bound=%f, num_cons =%d)",
205 sys, id, weight, bound, number_of_constraints);
207 var = (lmm_variable_t) xbt_mallocator_get(sys->variable_mallocator);
209 var->id_int = Global_debug_id++;
210 var->cnsts = (s_lmm_element_t *) xbt_realloc(var->cnsts, number_of_constraints * sizeof(s_lmm_element_t));
211 for (i = 0; i < number_of_constraints; i++) {
212 var->cnsts[i].element_set_hookup.next = NULL;
213 var->cnsts[i].element_set_hookup.prev = NULL;
214 var->cnsts[i].active_element_set_hookup.next = NULL;
215 var->cnsts[i].active_element_set_hookup.prev = NULL;
216 var->cnsts[i].constraint = NULL;
217 var->cnsts[i].variable = NULL;
218 var->cnsts[i].value = 0.0;
220 var->cnsts_size = number_of_constraints;
221 var->cnsts_number = 0;
222 var->weight = weight;
225 var->visited = sys->visited_counter - 1;
228 var->func_f = func_f_def;
229 var->func_fp = func_fp_def;
230 var->func_fpi = func_fpi_def;
232 var->variable_set_hookup.next = NULL;
233 var->variable_set_hookup.prev = NULL;
234 var->saturated_variable_set_hookup.next = NULL;
235 var->saturated_variable_set_hookup.prev = NULL;
238 xbt_swag_insert_at_head(var, &(sys->variable_set));
240 xbt_swag_insert_at_tail(var, &(sys->variable_set));
242 XBT_OUT(" returns %p", var);
246 void lmm_variable_free(lmm_system_t sys, lmm_variable_t var)
248 remove_variable(sys, var);
249 lmm_var_free(sys, var);
252 double lmm_variable_getvalue(lmm_variable_t var)
257 double lmm_variable_getbound(lmm_variable_t var)
262 /* Replace the content of elem_a with elem_b. The content of elem_b is cleared. */
263 static void renew_elem_entry(lmm_element_t elem_a, lmm_element_t elem_b)
265 elem_a->constraint = elem_b->constraint;
266 elem_a->variable = elem_b->variable;
267 elem_a->value = elem_b->value;
269 /* If elem_b is in the element_set swag, register the new element to the swag. */
270 if (xbt_swag_remove(elem_b, &(elem_b->constraint->element_set))) {
271 if (elem_a->variable->weight)
272 xbt_swag_insert_at_head(elem_a, &(elem_a->constraint->element_set));
274 xbt_swag_insert_at_tail(elem_a, &(elem_a->constraint->element_set));
277 if (xbt_swag_remove(elem_b, &(elem_b->constraint->active_element_set))) {
278 if (elem_a->variable->weight)
279 xbt_swag_insert_at_head(elem_a, &(elem_a->constraint->active_element_set));
281 xbt_swag_insert_at_tail(elem_a, &(elem_a->constraint->active_element_set));
284 elem_b->constraint = NULL;
285 elem_b->variable = NULL;
289 void lmm_shrink(lmm_system_t sys, lmm_constraint_t cnst,
292 lmm_element_t elem = NULL;
296 for (i = 0; i < var->cnsts_number; i++) {
297 elem = &(var->cnsts[i]);
298 if (elem->constraint == cnst) {
305 XBT_DEBUG("cnst %p is not found in var %p", cnst, var);
311 XBT_DEBUG("remove elem(value %f, cnst %p, var %p) in var %p",
312 elem->value, elem->constraint, elem->variable, var);
316 /* We are going to change the constraint object and the variable object.
317 * Propagate this change to other objects. Calling here (not after
318 * modification) is correct? */
319 lmm_update_modified_set(sys, cnst);
320 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].
324 /* now var->cnsts[i] is not necessary any more */
326 xbt_swag_remove(elem, &(elem->constraint->element_set));
327 xbt_swag_remove(elem, &(elem->constraint->active_element_set));
328 elem->constraint = NULL;
329 elem->variable = NULL;
334 /* We do not want to have an empty element entry before the last entry. So,
335 * plug up the hole with the last one. */
336 if (i < var->cnsts_number - 1)
337 renew_elem_entry(&var->cnsts[i], &var->cnsts[var->cnsts_number - 1]);
339 var->cnsts_number -= 1;
342 if (xbt_swag_size(&(cnst->element_set)) == 0)
343 make_constraint_inactive(sys, cnst);
346 void lmm_expand(lmm_system_t sys, lmm_constraint_t cnst,
347 lmm_variable_t var, double value)
349 lmm_element_t elem = NULL;
353 xbt_assert(var->cnsts_number < var->cnsts_size, "Too much constraints");
355 elem = &(var->cnsts[var->cnsts_number++]);
358 elem->constraint = cnst;
359 elem->variable = var;
362 xbt_swag_insert_at_head(elem, &(elem->constraint->element_set));
364 xbt_swag_insert_at_tail(elem, &(elem->constraint->element_set));
365 if(!sys->selective_update_active) {
366 make_constraint_active(sys, cnst);
367 } else if(elem->value>0 || var->weight >0) {
368 make_constraint_active(sys, cnst);
369 lmm_update_modified_set(sys, cnst);
370 if (var->cnsts_number > 1)
371 lmm_update_modified_set(sys, var->cnsts[0].constraint);
375 void lmm_expand_add(lmm_system_t sys, lmm_constraint_t cnst,
376 lmm_variable_t var, double value)
381 for (i = 0; i < var->cnsts_number; i++)
382 if (var->cnsts[i].constraint == cnst)
385 if (i < var->cnsts_number) {
386 if (cnst->sharing_policy)
387 var->cnsts[i].value += value;
389 var->cnsts[i].value = MAX(var->cnsts[i].value, value);
390 lmm_update_modified_set(sys, cnst);
392 lmm_expand(sys, cnst, var, value);
395 lmm_constraint_t lmm_get_cnst_from_var(lmm_system_t /*sys*/,
399 if (num < var->cnsts_number)
400 return (var->cnsts[num].constraint);
405 double lmm_get_cnst_weight_from_var(lmm_system_t /*sys*/,
409 if (num < var->cnsts_number)
410 return (var->cnsts[num].value);
415 int lmm_get_number_of_cnst_from_var(lmm_system_t /*sys*/,
418 return (var->cnsts_number);
421 lmm_variable_t lmm_get_var_from_cnst(lmm_system_t /*sys*/,
422 lmm_constraint_t cnst,
423 lmm_element_t * elem)
426 *elem = (lmm_element_t) xbt_swag_getFirst(&(cnst->element_set));
428 *elem = (lmm_element_t) xbt_swag_getNext(*elem, cnst->element_set.offset);
430 return (*elem)->variable;
435 //if we modify the swag between calls, normal version may loop forever
436 //this safe version ensures that we browse the swag elements only once
437 lmm_variable_t lmm_get_var_from_cnst_safe(lmm_system_t /*sys*/,
438 lmm_constraint_t cnst,
439 lmm_element_t * elem,
440 lmm_element_t * nextelem,
444 *elem = (lmm_element_t) xbt_swag_getFirst(&(cnst->element_set));
445 *numelem = xbt_swag_size(&(cnst->element_set))-1;
454 *nextelem = (lmm_element_t) xbt_swag_getNext(*elem, cnst->element_set.offset);
455 return (*elem)->variable;
460 void *lmm_constraint_id(lmm_constraint_t cnst)
465 void *lmm_variable_id(lmm_variable_t var)
470 static XBT_INLINE void saturated_constraint_set_update(double usage,
472 dyn_light_t saturated_constraint_set,
475 xbt_assert(usage > 0,"Impossible");
477 if (*min_usage < 0 || *min_usage > usage) {
479 // XBT_HERE(" min_usage=%f (cnst->remaining / cnst->usage =%f)", *min_usage, usage);
480 saturated_constraint_set->data[0] = cnst_light_num;
481 saturated_constraint_set->pos = 1;
482 } else if (*min_usage == usage) {
483 if(saturated_constraint_set->pos == saturated_constraint_set->size) { // realloc the size
484 saturated_constraint_set->size *= 2;
485 saturated_constraint_set->data = (int*) xbt_realloc(saturated_constraint_set->data, (saturated_constraint_set->size) * sizeof(int));
487 saturated_constraint_set->data[saturated_constraint_set->pos] = cnst_light_num;
488 saturated_constraint_set->pos++;
492 static XBT_INLINE void saturated_variable_set_update(
493 s_lmm_constraint_light_t *cnst_light_tab,
494 dyn_light_t saturated_constraint_set,
497 /* Add active variables (i.e. variables that need to be set) from the set of constraints to saturate (cnst_light_tab)*/
498 lmm_constraint_light_t cnst = NULL;
500 lmm_element_t elem = NULL;
501 xbt_swag_t elem_list = NULL;
503 for(i = 0; i< saturated_constraint_set->pos; i++){
504 cnst = &cnst_light_tab[saturated_constraint_set->data[i]];
505 elem_list = &(cnst->cnst->active_element_set);
506 xbt_swag_foreach(_elem, elem_list) {
507 elem = (lmm_element_t)_elem;
508 if (elem->variable->weight <= 0)
510 if ((elem->value > 0))
511 xbt_swag_insert(elem->variable, &(sys->saturated_variable_set));
516 void lmm_print(lmm_system_t sys)
518 void *_cnst, *_elem, *_var;
519 lmm_constraint_t cnst = NULL;
520 lmm_element_t elem = NULL;
521 lmm_variable_t var = NULL;
522 xbt_swag_t cnst_list = NULL;
523 xbt_swag_t var_list = NULL;
524 xbt_swag_t elem_list = NULL;
525 char print_buf[1024];
526 char *trace_buf = (char*) xbt_malloc0(sizeof(char));
529 /* Printing Objective */
530 var_list = &(sys->variable_set);
531 sprintf(print_buf, "MAX-MIN ( ");
533 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
534 strcat(trace_buf, print_buf);
535 xbt_swag_foreach(_var, var_list) {
536 var = (lmm_variable_t)_var;
537 sprintf(print_buf, "'%d'(%f) ", var->id_int, var->weight);
539 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
540 strcat(trace_buf, print_buf);
542 sprintf(print_buf, ")");
544 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
545 strcat(trace_buf, print_buf);
546 XBT_DEBUG("%20s", trace_buf);
547 trace_buf[0] = '\000';
549 XBT_DEBUG("Constraints");
550 /* Printing Constraints */
551 cnst_list = &(sys->active_constraint_set);
552 xbt_swag_foreach(_cnst, cnst_list) {
553 cnst = (lmm_constraint_t)_cnst;
555 elem_list = &(cnst->element_set);
556 sprintf(print_buf, "\t");
558 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
559 strcat(trace_buf, print_buf);
560 sprintf(print_buf, "%s(",(cnst->sharing_policy)?"":"max");
562 xbt_realloc(trace_buf,
563 strlen(trace_buf) + strlen(print_buf) + 1);
564 strcat(trace_buf, print_buf);
565 xbt_swag_foreach(_elem, elem_list) {
566 elem = (lmm_element_t)_elem;
567 sprintf(print_buf, "%f.'%d'(%f) %s ", elem->value,
568 elem->variable->id_int, elem->variable->value,(cnst->sharing_policy)?"+":",");
570 xbt_realloc(trace_buf,
571 strlen(trace_buf) + strlen(print_buf) + 1);
572 strcat(trace_buf, print_buf);
573 if(cnst->sharing_policy)
574 sum += elem->value * elem->variable->value;
576 sum = MAX(sum,elem->value * elem->variable->value);
578 sprintf(print_buf, "0) <= %f ('%d')", cnst->bound, cnst->id_int);
580 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
581 strcat(trace_buf, print_buf);
583 if (!cnst->sharing_policy) {
584 sprintf(print_buf, " [MAX-Constraint]");
586 xbt_realloc(trace_buf,
587 strlen(trace_buf) + strlen(print_buf) + 1);
588 strcat(trace_buf, print_buf);
590 XBT_DEBUG("%s", trace_buf);
591 trace_buf[0] = '\000';
592 xbt_assert(!double_positive(sum - cnst->bound, cnst->bound*sg_maxmin_precision),
593 "Incorrect value (%f is not smaller than %f): %g",
594 sum, cnst->bound, sum - cnst->bound);
597 XBT_DEBUG("Variables");
598 /* Printing Result */
599 xbt_swag_foreach(_var, var_list) {
600 var = (lmm_variable_t)_var;
601 if (var->bound > 0) {
602 XBT_DEBUG("'%d'(%f) : %f (<=%f)", var->id_int, var->weight, var->value,
604 xbt_assert(!double_positive(var->value - var->bound, var->bound*sg_maxmin_precision),
605 "Incorrect value (%f is not smaller than %f",
606 var->value, var->bound);
608 XBT_DEBUG("'%d'(%f) : %f", var->id_int, var->weight, var->value);
615 void lmm_solve(lmm_system_t sys)
617 void *_var, *_cnst, *_cnst_next, *_elem;
618 lmm_variable_t var = NULL;
619 lmm_constraint_t cnst = NULL;
620 lmm_element_t elem = NULL;
621 xbt_swag_t cnst_list = NULL;
622 xbt_swag_t var_list = NULL;
623 xbt_swag_t elem_list = NULL;
624 double min_usage = -1;
625 double min_bound = -1;
627 if (!(sys->modified))
630 XBT_IN("(sys=%p)", sys);
633 * Compute Usage and store the variables that reach the maximum. If selective_update_active is true, only constraints that changed are considered. Otherwise all constraints with active actions are considered.
637 selective_update_active ? &(sys->modified_constraint_set) :
638 &(sys->active_constraint_set);
640 XBT_DEBUG("Active constraints : %d", xbt_swag_size(cnst_list));
641 /* Init: Only modified code portions: reset the value of active variables */
642 xbt_swag_foreach(_cnst, cnst_list) {
643 cnst = (lmm_constraint_t)_cnst;
644 elem_list = &(cnst->element_set);
645 //XBT_DEBUG("Variable set : %d", xbt_swag_size(elem_list));
646 xbt_swag_foreach(_elem, elem_list) {
647 var = ((lmm_element_t)_elem)->variable;
648 if (var->weight <= 0.0)
654 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));
655 int cnst_light_num = 0;
656 dyn_light_t saturated_constraint_set = xbt_new0(s_dyn_light_t,1);
657 saturated_constraint_set->size = 5;
658 saturated_constraint_set->data = xbt_new0(int, saturated_constraint_set->size);
660 xbt_swag_foreach_safe(_cnst, _cnst_next, cnst_list) {
661 cnst = (lmm_constraint_t)_cnst;
662 /* INIT: Collect constraints that actually need to be saturated (i.e remaining and usage are strictly positive) into cnst_light_tab. */
663 cnst->remaining = cnst->bound;
664 if (!double_positive(cnst->remaining, cnst->bound*sg_maxmin_precision))
667 elem_list = &(cnst->element_set);
668 xbt_swag_foreach(_elem, elem_list) {
669 elem = (lmm_element_t)_elem;
670 /* 0-weighted elements (ie, sleep actions) are at the end of the swag and we don't want to consider them */
671 if (elem->variable->weight <= 0)
673 if ((elem->value > 0)) {
674 if (cnst->sharing_policy)
675 cnst->usage += elem->value / elem->variable->weight;
676 else if (cnst->usage < elem->value / elem->variable->weight)
677 cnst->usage = elem->value / elem->variable->weight;
679 make_elem_active(elem);
680 Action *action = static_cast<Action*>(elem->variable->id);
681 if (sys->keep_track && !action->is_linked())
682 sys->keep_track->push_back(*action);
685 XBT_DEBUG("Constraint '%d' usage: %f remaining: %f ", cnst->id_int, cnst->usage, cnst->remaining);
686 /* Saturated constraints update */
688 if(cnst->usage > 0) {
689 cnst_light_tab[cnst_light_num].cnst = cnst;
690 cnst->cnst_light = &(cnst_light_tab[cnst_light_num]);
691 cnst_light_tab[cnst_light_num].remaining_over_usage = cnst->remaining / cnst->usage;
692 saturated_constraint_set_update(cnst_light_tab[cnst_light_num].remaining_over_usage,
693 cnst_light_num, saturated_constraint_set, &min_usage);
694 xbt_assert(cnst->active_element_set.count>0, "There is no sense adding a constraint that has no active element!" );
699 saturated_variable_set_update( cnst_light_tab,
700 saturated_constraint_set,
703 /* Saturated variables update */
706 /* Fix the variables that have to be */
707 var_list = &(sys->saturated_variable_set);
709 xbt_swag_foreach(_var, var_list) {
710 var = (lmm_variable_t)_var;
711 if (var->weight <= 0.0)
713 /* First check if some of these variables could reach their upper
714 bound and update min_bound accordingly. */
716 ("var=%d, var->bound=%f, var->weight=%f, min_usage=%f, var->bound*var->weight=%f",
717 var->id_int, var->bound, var->weight, min_usage,
718 var->bound * var->weight);
719 if ((var->bound > 0) && (var->bound * var->weight < min_usage)) {
721 min_bound = var->bound*var->weight;
723 min_bound = MIN(min_bound, (var->bound*var->weight));
724 XBT_DEBUG("Updated min_bound=%f", min_bound);
729 while ((var = (lmm_variable_t)xbt_swag_getFirst(var_list))) {
733 //If no variable could reach its bound, deal iteratively the constraints usage ( at worst one constraint is saturated at each cycle)
734 var->value = min_usage / var->weight;
735 XBT_DEBUG("Setting %p (%d) value to %f\n", var, var->id_int, var->value);
737 //If there exist a variable that can reach its bound, only update it (and other with the same bound) for now.
738 if (double_equals(min_bound, var->bound*var->weight, sg_maxmin_precision)){
739 var->value = var->bound;
740 XBT_DEBUG("Setting %p (%d) value to %f\n", var, var->id_int, var->value);
743 // Variables which bound is different are not considered for this cycle, but they will be afterwards.
744 XBT_DEBUG("Do not consider %p (%d) \n", var, var->id_int);
745 xbt_swag_remove(var, var_list);
749 XBT_DEBUG("Min usage: %f, Var(%d)->weight: %f, Var(%d)->value: %f ",
750 min_usage, var->id_int, var->weight, var->id_int, var->value);
753 /* Update the usage of contraints where this variable is involved */
754 for (i = 0; i < var->cnsts_number; i++) {
755 elem = &var->cnsts[i];
756 cnst = elem->constraint;
757 if (cnst->sharing_policy) {
758 //Remember: shared constraints require that sum(elem->value * var->value) < cnst->bound
759 double_update(&(cnst->remaining), elem->value * var->value, cnst->bound*sg_maxmin_precision);
760 double_update(&(cnst->usage), elem->value / var->weight, sg_maxmin_precision);
761 //If the constraint is saturated, remove it from the set of active constraints (light_tab)
762 if(!double_positive(cnst->usage,sg_maxmin_precision) || !double_positive(cnst->remaining,cnst->bound*sg_maxmin_precision)) {
763 if (cnst->cnst_light) {
764 int index = (cnst->cnst_light-cnst_light_tab);
765 XBT_DEBUG("index: %d \t cnst_light_num: %d \t || \t cnst: %p \t cnst->cnst_light: %p \t cnst_light_tab: %p usage: %f remaining: %f bound: %f ",
766 index,cnst_light_num, cnst, cnst->cnst_light, cnst_light_tab, cnst->usage, cnst->remaining, cnst->bound);
767 cnst_light_tab[index]=cnst_light_tab[cnst_light_num-1];
768 cnst_light_tab[index].cnst->cnst_light = &cnst_light_tab[index];
770 cnst->cnst_light = NULL;
773 cnst->cnst_light->remaining_over_usage = cnst->remaining / cnst->usage;
775 make_elem_inactive(elem);
777 //Remember: non-shared constraints only require that max(elem->value * var->value) < cnst->bound
779 make_elem_inactive(elem);
780 elem_list = &(cnst->element_set);
781 xbt_swag_foreach(_elem, elem_list) {
782 elem = (lmm_element_t)_elem;
783 if (elem->variable->weight <= 0) break; //Found an inactive variable -> no more active variables
784 if (elem->variable->value > 0) continue;
786 cnst->usage = MAX(cnst->usage, elem->value / elem->variable->weight);
788 //If the constraint is saturated, remove it from the set of active constraints (light_tab)
789 if(!double_positive(cnst->usage,sg_maxmin_precision) || !double_positive(cnst->remaining,cnst->bound*sg_maxmin_precision)) {
790 if(cnst->cnst_light) {
791 int index = (cnst->cnst_light-cnst_light_tab);
792 XBT_DEBUG("index: %d \t cnst_light_num: %d \t || \t cnst: %p \t cnst->cnst_light: %p \t cnst_light_tab: %p usage: %f remaining: %f bound: %f ",
793 index,cnst_light_num, cnst, cnst->cnst_light, cnst_light_tab, cnst->usage, cnst->remaining, cnst->bound);
794 cnst_light_tab[index]=cnst_light_tab[cnst_light_num-1];
795 cnst_light_tab[index].cnst->cnst_light = &cnst_light_tab[index];
797 cnst->cnst_light = NULL;
800 cnst->cnst_light->remaining_over_usage = cnst->remaining / cnst->usage;
801 xbt_assert(cnst->active_element_set.count>0, "Should not keep a maximum constraint that has no active element! You want to check the maxmin precision and possible rounding effects." );
805 xbt_swag_remove(var, var_list);
808 /* Find out which variables reach the maximum */
811 saturated_constraint_set->pos = 0;
813 for(pos=0; pos<cnst_light_num; pos++){
814 xbt_assert(cnst_light_tab[pos].cnst->active_element_set.count>0, "Cannot saturate more a constraint that has no active element! You may want to change the maxmin precision (--cfg=maxmin/precision:<new_value>) because of possible rounding effects.\n\tFor the record, the usage of this constraint is %g while the maxmin precision to which it is compared is %g.\n\tThe usage of the previous constraint is %g.", cnst_light_tab[pos].cnst->usage, sg_maxmin_precision, cnst_light_tab[pos-1].cnst->usage);
815 saturated_constraint_set_update(
816 cnst_light_tab[pos].remaining_over_usage,
818 saturated_constraint_set,
822 saturated_variable_set_update( cnst_light_tab,
823 saturated_constraint_set,
826 } while (cnst_light_num > 0);
829 if (sys->selective_update_active)
830 lmm_remove_all_modified_set(sys);
832 if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
836 xbt_free(saturated_constraint_set->data);
837 xbt_free(saturated_constraint_set);
838 xbt_free(cnst_light_tab);
842 /* Not a O(1) function */
844 void lmm_update(lmm_system_t sys, lmm_constraint_t cnst,
845 lmm_variable_t var, double value)
849 for (i = 0; i < var->cnsts_number; i++)
850 if (var->cnsts[i].constraint == cnst) {
851 var->cnsts[i].value = value;
853 lmm_update_modified_set(sys, cnst);
858 /** \brief Attribute the value bound to var->bound.
860 * \param sys the lmm_system_t
861 * \param var the lmm_variable_t
862 * \param bound the new bound to associate with var
864 * Makes var->bound equal to bound. Whenever this function is called
865 * a change is signed in the system. To
866 * avoid false system changing detection it is a good idea to test
867 * (bound != 0) before calling it.
870 void lmm_update_variable_bound(lmm_system_t sys, lmm_variable_t var,
876 if (var->cnsts_number)
877 lmm_update_modified_set(sys, var->cnsts[0].constraint);
881 void lmm_update_variable_weight(lmm_system_t sys, lmm_variable_t var,
887 if (weight == var->weight)
889 XBT_IN("(sys=%p, var=%p, weight=%f)", sys, var, weight);
891 var->weight = weight;
892 xbt_swag_remove(var, &(sys->variable_set));
894 xbt_swag_insert_at_head(var, &(sys->variable_set));
896 xbt_swag_insert_at_tail(var, &(sys->variable_set));
898 for (i = 0; i < var->cnsts_number; i++) {
899 elem = &var->cnsts[i];
900 xbt_swag_remove(elem, &(elem->constraint->element_set));
902 xbt_swag_insert_at_head(elem, &(elem->constraint->element_set));
904 xbt_swag_insert_at_tail(elem, &(elem->constraint->element_set));
907 lmm_update_modified_set(sys, elem->constraint);
915 double lmm_get_variable_weight(lmm_variable_t var)
920 void lmm_update_constraint_bound(lmm_system_t sys,
921 lmm_constraint_t cnst,
925 lmm_update_modified_set(sys, cnst);
929 int lmm_constraint_used(lmm_system_t sys, lmm_constraint_t cnst)
931 return xbt_swag_belongs(cnst, &(sys->active_constraint_set));
934 XBT_INLINE lmm_constraint_t lmm_get_first_active_constraint(lmm_system_t
937 return (lmm_constraint_t)xbt_swag_getFirst(&(sys->active_constraint_set));
940 XBT_INLINE lmm_constraint_t lmm_get_next_active_constraint(lmm_system_t
945 return (lmm_constraint_t)xbt_swag_getNext(cnst, (sys->active_constraint_set).offset);
948 #ifdef HAVE_LATENCY_BOUND_TRACKING
949 XBT_INLINE int lmm_is_variable_limited_by_latency(lmm_variable_t var)
951 return (double_equals(var->bound, var->value, var->bound*sg_maxmin_precision));
956 /** \brief Update the constraint set propagating recursively to
957 * other constraints so the system should not be entirely computed.
959 * \param sys the lmm_system_t
960 * \param cnst the lmm_constraint_t affected by the change
962 * A recursive algorithm to optimize the system recalculation selecting only
963 * constraints that have changed. Each constraint change is propagated
964 * to the list of constraints for each variable.
966 static void lmm_update_modified_set_rec(lmm_system_t sys,
967 lmm_constraint_t cnst)
971 xbt_swag_foreach(_elem, &cnst->element_set) {
972 lmm_variable_t var = ((lmm_element_t)_elem)->variable;
973 s_lmm_element_t *cnsts = var->cnsts;
975 for (i = 0; var->visited != sys->visited_counter
976 && i < var->cnsts_number ; i++) {
977 if (cnsts[i].constraint != cnst
978 && !xbt_swag_belongs(cnsts[i].constraint,
979 &sys->modified_constraint_set)) {
980 xbt_swag_insert(cnsts[i].constraint, &sys->modified_constraint_set);
981 lmm_update_modified_set_rec(sys, cnsts[i].constraint);
984 var->visited = sys->visited_counter;
988 static void lmm_update_modified_set(lmm_system_t sys,
989 lmm_constraint_t cnst)
991 /* nothing to do if selective update isn't active */
992 if (sys->selective_update_active
993 && !xbt_swag_belongs(cnst, &sys->modified_constraint_set)) {
994 xbt_swag_insert(cnst, &sys->modified_constraint_set);
995 lmm_update_modified_set_rec(sys, cnst);
999 /** \brief Remove all constraints of the modified_constraint_set.
1001 * \param sys the lmm_system_t
1003 static void lmm_remove_all_modified_set(lmm_system_t sys)
1005 if (++sys->visited_counter == 1) {
1006 /* the counter wrapped around, reset each variable->visited */
1008 xbt_swag_foreach(_var, &sys->variable_set)
1009 ((lmm_variable_t)_var)->visited = 0;
1011 xbt_swag_reset(&sys->modified_constraint_set);
1015 * Returns total resource load
1017 * \param cnst the lmm_constraint_t associated to the resource
1020 double lmm_constraint_get_usage(lmm_constraint_t cnst) {
1022 xbt_swag_t elem_list = &(cnst->element_set);
1024 lmm_element_t elem = NULL;
1026 xbt_swag_foreach(_elem, elem_list) {
1027 elem = (lmm_element_t)_elem;
1028 /* 0-weighted elements (ie, sleep actions) are at the end of the swag and we don't want to consider them */
1029 if (elem->variable->weight <= 0)
1031 if ((elem->value > 0)) {
1032 if (cnst->sharing_policy)
1033 usage += elem->value * elem->variable->value;
1034 else if (usage < elem->value * elem->variable->value)
1035 usage = elem->value * elem->variable->value;