1 /* Copyright (c) 2004-2017. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 /* \file callbacks.h */
8 #include "maxmin_private.hpp"
10 #include "xbt/mallocator.h"
11 #include "xbt/sysdep.h"
17 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_maxmin, surf, "Logging specific to SURF (maxmin)");
19 typedef struct s_dyn_light {
24 typedef s_dyn_light_t* dyn_light_t;
26 double sg_maxmin_precision = 0.00001; /* Change this with --cfg=maxmin/precision:VALUE */
27 double sg_surf_precision = 0.00001; /* Change this with --cfg=surf/precision:VALUE */
28 int sg_concurrency_limit = -1; /* Change this with --cfg=maxmin/concurrency-limit:VALUE */
30 static void *lmm_variable_mallocator_new_f();
31 static void lmm_variable_mallocator_free_f(void *var);
32 #define lmm_variable_mallocator_reset_f ((void_f_pvoid_t)nullptr)
33 static void lmm_update_modified_set(lmm_system_t sys, lmm_constraint_t cnst);
34 static void lmm_remove_all_modified_set(lmm_system_t sys);
35 static int Global_debug_id = 1;
36 static int Global_const_debug_id = 1;
38 static inline void lmm_cnst_free(lmm_system_t sys, lmm_constraint_t cnst);
40 static void lmm_on_disabled_var(lmm_system_t sys, lmm_constraint_t cnstr);
41 static void lmm_enable_var(lmm_system_t sys, lmm_variable_t var);
42 static int lmm_can_enable_var(lmm_variable_t var);
43 static void lmm_disable_var(lmm_system_t sys, lmm_variable_t var);
44 static int lmm_concurrency_slack(lmm_constraint_t cnstr);
45 static int lmm_cnstrs_min_concurrency_slack(lmm_variable_t var);
47 inline int lmm_element_concurrency(lmm_element_t elem) {
48 //Ignore element with weight less than one (e.g. cross-traffic)
49 return (elem->consumption_weight >= 1) ? 1 : 0;
50 //There are other alternatives, but they will change the behaviour of the model..
51 //So do not use it unless you want to make a new model.
52 //If you do, remember to change the variables concurrency share to reflect it.
53 //Potential examples are:
54 //return (elem->weight>0)?1:0;//Include element as soon as weight is non-zero
55 //return (int)ceil(elem->weight);//Include element as the rounded-up integer value of the element weight
58 inline void lmm_decrease_concurrency(lmm_element_t elem) {
59 xbt_assert(elem->constraint->concurrency_current>=lmm_element_concurrency(elem));
60 elem->constraint->concurrency_current-=lmm_element_concurrency(elem);
63 inline void lmm_increase_concurrency(lmm_element_t elem) {
64 elem->constraint->concurrency_current+= lmm_element_concurrency(elem);
66 lmm_constraint_t cnstr=elem->constraint;
68 if(cnstr->concurrency_current > cnstr->concurrency_maximum)
69 cnstr->concurrency_maximum= cnstr->concurrency_current;
71 xbt_assert(cnstr->concurrency_limit<0 || cnstr->concurrency_current<=cnstr->concurrency_limit,
72 "Concurrency limit overflow!");
75 static void lmm_check_concurrency(lmm_system_t sys)
77 // These checks are very expensive, so do them only if we want to debug SURF LMM
78 if (not XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug))
82 xbt_swag_foreach(cnstIt, &(sys->constraint_set))
84 lmm_constraint_t cnst = (lmm_constraint_t)cnstIt;
87 xbt_swag_foreach(elemIt, &(cnst->enabled_element_set))
89 lmm_element_t elem = (lmm_element_t)elemIt;
90 xbt_assert(elem->variable->sharing_weight > 0);
91 concurrency += lmm_element_concurrency(elem);
94 xbt_swag_foreach(elemIt, &(cnst->disabled_element_set))
96 lmm_element_t elem = (lmm_element_t)elemIt;
97 // We should have staged variables only if concurrency is reached in some constraint
98 xbt_assert(cnst->concurrency_limit < 0 || elem->variable->staged_weight == 0 ||
99 lmm_cnstrs_min_concurrency_slack(elem->variable) < elem->variable->concurrency_share,
100 "should not have staged variable!");
103 xbt_assert(cnst->concurrency_limit < 0 || cnst->concurrency_limit >= concurrency, "concurrency check failed!");
104 xbt_assert(cnst->concurrency_current == concurrency, "concurrency_current is out-of-date!");
107 // Check that for each variable, all corresponding elements are in the same state (i.e. same element sets)
109 xbt_swag_foreach(varIt, &(sys->variable_set))
111 lmm_variable_t var = (lmm_variable_t)varIt;
113 if (not var->cnsts_number)
116 lmm_element_t elem = &var->cnsts[0];
117 int belong_to_enabled = xbt_swag_belongs(elem, &(elem->constraint->enabled_element_set));
118 int belong_to_disabled = xbt_swag_belongs(elem, &(elem->constraint->disabled_element_set));
119 int belong_to_active = xbt_swag_belongs(elem, &(elem->constraint->active_element_set));
121 for (int i = 1; i < var->cnsts_number; i++) {
122 elem = &var->cnsts[i];
123 xbt_assert(belong_to_enabled == xbt_swag_belongs(elem, &(elem->constraint->enabled_element_set)),
124 "Variable inconsistency (1): enabled_element_set");
125 xbt_assert(belong_to_disabled == xbt_swag_belongs(elem, &(elem->constraint->disabled_element_set)),
126 "Variable inconsistency (2): disabled_element_set");
127 xbt_assert(belong_to_active == xbt_swag_belongs(elem, &(elem->constraint->active_element_set)),
128 "Variable inconsistency (3): active_element_set");
133 static inline void lmm_variable_remove(lmm_system_t sys, lmm_variable_t var)
135 XBT_IN("(sys=%p, var=%p)", sys, var);
138 // TODOLATER Can do better than that by leaving only the variable in only one enabled_element_set, call
139 // lmm_update_modified_set, and then remove it..
140 if (var->cnsts_number)
141 lmm_update_modified_set(sys, var->cnsts[0].constraint);
143 for (int i = 0; i < var->cnsts_number; i++) {
144 lmm_element_t elem = &var->cnsts[i];
145 if (var->sharing_weight > 0)
146 lmm_decrease_concurrency(elem);
147 xbt_swag_remove(elem, &(elem->constraint->enabled_element_set));
148 xbt_swag_remove(elem, &(elem->constraint->disabled_element_set));
149 xbt_swag_remove(elem, &(elem->constraint->active_element_set));
150 int nelements = xbt_swag_size(&(elem->constraint->enabled_element_set)) +
151 xbt_swag_size(&(elem->constraint->disabled_element_set));
153 make_constraint_inactive(sys, elem->constraint);
155 lmm_on_disabled_var(sys, elem->constraint);
158 // Check if we can enable new variables going through the constraints where var was.
159 // Do it after removing all elements, so he first disabled variables get priority over those with smaller requirement
160 for (int i = 0; i < var->cnsts_number; i++) {
161 lmm_element_t elem = &var->cnsts[i];
162 if (xbt_swag_size(&(elem->constraint->disabled_element_set)))
163 lmm_on_disabled_var(sys, elem->constraint);
166 var->cnsts_number = 0;
168 lmm_check_concurrency(sys);
173 static void lmm_var_free(lmm_system_t sys, lmm_variable_t var)
175 lmm_variable_remove(sys, var);
176 xbt_mallocator_release(sys->variable_mallocator, var);
179 lmm_system_t lmm_system_new(bool selective_update)
181 s_lmm_variable_t var;
182 s_lmm_constraint_t cnst;
184 lmm_system_t l = xbt_new0(s_lmm_system_t, 1);
187 l->selective_update_active = selective_update;
188 l->visited_counter = 1;
190 XBT_DEBUG("Setting selective_update_active flag to %d", l->selective_update_active);
192 xbt_swag_init(&(l->variable_set), xbt_swag_offset(var, variable_set_hookup));
193 xbt_swag_init(&(l->constraint_set), xbt_swag_offset(cnst, constraint_set_hookup));
195 xbt_swag_init(&(l->active_constraint_set), xbt_swag_offset(cnst, active_constraint_set_hookup));
197 xbt_swag_init(&(l->modified_constraint_set), xbt_swag_offset(cnst, modified_constraint_set_hookup));
198 xbt_swag_init(&(l->saturated_variable_set), xbt_swag_offset(var, saturated_variable_set_hookup));
199 xbt_swag_init(&(l->saturated_constraint_set), xbt_swag_offset(cnst, saturated_constraint_set_hookup));
201 l->variable_mallocator = xbt_mallocator_new(65536,
202 lmm_variable_mallocator_new_f,
203 lmm_variable_mallocator_free_f,
204 lmm_variable_mallocator_reset_f);
206 l->solve_fun = &lmm_solve;
211 void lmm_system_free(lmm_system_t sys)
213 lmm_variable_t var = nullptr;
214 lmm_constraint_t cnst = nullptr;
219 while ((var = (lmm_variable_t) extract_variable(sys))) {
221 char* demangled = abi::__cxa_demangle(typeid(*var->id).name(), 0, 0, &status);
223 XBT_WARN("Probable bug: a %s variable (#%d) not removed before the LMM system destruction.", demangled,
226 lmm_var_free(sys, var);
228 while ((cnst = (lmm_constraint_t) extract_constraint(sys)))
229 lmm_cnst_free(sys, cnst);
231 xbt_mallocator_free(sys->variable_mallocator);
235 static inline void lmm_cnst_free(lmm_system_t sys, lmm_constraint_t cnst)
237 make_constraint_inactive(sys, cnst);
241 lmm_constraint_t lmm_constraint_new(lmm_system_t sys, void *id, double bound_value)
243 lmm_constraint_t cnst = nullptr;
244 s_lmm_element_t elem;
246 cnst = xbt_new0(s_lmm_constraint_t, 1);
248 cnst->id_int = Global_const_debug_id++;
249 xbt_swag_init(&(cnst->enabled_element_set), xbt_swag_offset(elem, enabled_element_set_hookup));
250 xbt_swag_init(&(cnst->disabled_element_set), xbt_swag_offset(elem, disabled_element_set_hookup));
251 xbt_swag_init(&(cnst->active_element_set), xbt_swag_offset(elem, active_element_set_hookup));
253 cnst->bound = bound_value;
254 cnst->concurrency_maximum=0;
255 cnst->concurrency_current=0;
256 cnst->concurrency_limit = sg_concurrency_limit;
258 cnst->sharing_policy = 1; /* FIXME: don't hardcode the value */
259 insert_constraint(sys, cnst);
264 int lmm_constraint_concurrency_limit_get(lmm_constraint_t cnst)
266 return cnst->concurrency_limit;
269 void lmm_constraint_concurrency_limit_set(lmm_constraint_t cnst, int concurrency_limit)
271 xbt_assert(concurrency_limit<0 || cnst->concurrency_maximum<=concurrency_limit,
272 "New concurrency limit should be larger than observed concurrency maximum. Maybe you want to call"
273 " lmm_constraint_concurrency_maximum_reset() to reset the maximum?");
274 cnst->concurrency_limit = concurrency_limit;
277 void lmm_constraint_concurrency_maximum_reset(lmm_constraint_t cnst)
279 cnst->concurrency_maximum = 0;
282 int lmm_constraint_concurrency_maximum_get(lmm_constraint_t cnst)
284 xbt_assert(cnst->concurrency_limit<0 || cnst->concurrency_maximum<=cnst->concurrency_limit,
285 "Very bad: maximum observed concurrency is higher than limit. This is a bug of SURF, please report it.");
286 return cnst->concurrency_maximum;
289 void lmm_constraint_shared(lmm_constraint_t cnst)
291 cnst->sharing_policy = 0;
294 /** Return true if the constraint is shared, and false if it's FATPIPE */
295 int lmm_constraint_sharing_policy(lmm_constraint_t cnst)
297 return (cnst->sharing_policy);
300 /* @brief Remove a constraint
301 * Currently this is dead code, but it is exposed in maxmin.h
302 * Apparently, this call was designed assuming that constraint would no more have elements in it.
303 * If not the case, assertion will fail, and you need to add calls e.g. to lmm_shrink before effectively removing it.
305 inline void lmm_constraint_free(lmm_system_t sys,lmm_constraint_t cnst)
307 xbt_assert(not xbt_swag_size(&(cnst->active_element_set)), "Removing constraint but it still has active elements");
308 xbt_assert(not xbt_swag_size(&(cnst->enabled_element_set)), "Removing constraint but it still has enabled elements");
309 xbt_assert(not xbt_swag_size(&(cnst->disabled_element_set)),
310 "Removing constraint but it still has disabled elements");
311 remove_constraint(sys, cnst);
312 lmm_cnst_free(sys, cnst);
315 static void *lmm_variable_mallocator_new_f()
317 lmm_variable_t var = xbt_new(s_lmm_variable_t, 1);
318 var->cnsts = nullptr; /* will be created by realloc */
322 static void lmm_variable_mallocator_free_f(void *var)
324 xbt_free(((lmm_variable_t) var)->cnsts);
328 lmm_variable_t lmm_variable_new(lmm_system_t sys, simgrid::surf::Action* id, double sharing_weight, double bound,
329 int number_of_constraints)
331 XBT_IN("(sys=%p, id=%p, weight=%f, bound=%f, num_cons =%d)", sys, id, sharing_weight, bound, number_of_constraints);
333 lmm_variable_t var = (lmm_variable_t)xbt_mallocator_get(sys->variable_mallocator);
335 var->id_int = Global_debug_id++;
336 var->cnsts = (s_lmm_element_t *) xbt_realloc(var->cnsts, number_of_constraints * sizeof(s_lmm_element_t));
337 for (int i = 0; i < number_of_constraints; i++) {
338 var->cnsts[i].enabled_element_set_hookup.next = nullptr;
339 var->cnsts[i].enabled_element_set_hookup.prev = nullptr;
340 var->cnsts[i].disabled_element_set_hookup.next = nullptr;
341 var->cnsts[i].disabled_element_set_hookup.prev = nullptr;
342 var->cnsts[i].active_element_set_hookup.next = nullptr;
343 var->cnsts[i].active_element_set_hookup.prev = nullptr;
344 var->cnsts[i].constraint = nullptr;
345 var->cnsts[i].variable = nullptr;
346 var->cnsts[i].consumption_weight = 0.0;
348 var->cnsts_size = number_of_constraints;
349 var->cnsts_number = 0;
350 var->sharing_weight = sharing_weight;
351 var->staged_weight = 0.0;
353 var->concurrency_share = 1;
355 var->visited = sys->visited_counter - 1;
358 var->func_f = func_f_def;
359 var->func_fp = func_fp_def;
360 var->func_fpi = func_fpi_def;
362 var->variable_set_hookup.next = nullptr;
363 var->variable_set_hookup.prev = nullptr;
364 var->saturated_variable_set_hookup.next = nullptr;
365 var->saturated_variable_set_hookup.prev = nullptr;
368 xbt_swag_insert_at_head(var, &(sys->variable_set));
370 xbt_swag_insert_at_tail(var, &(sys->variable_set));
372 XBT_OUT(" returns %p", var);
376 void lmm_variable_free(lmm_system_t sys, lmm_variable_t var)
378 remove_variable(sys, var);
379 lmm_var_free(sys, var);
382 double lmm_variable_getvalue(lmm_variable_t var)
387 void lmm_variable_concurrency_share_set(lmm_variable_t var, short int concurrency_share)
389 var->concurrency_share=concurrency_share;
392 double lmm_variable_getbound(lmm_variable_t var)
397 void lmm_shrink(lmm_system_t sys, lmm_constraint_t cnst, lmm_variable_t var)
399 lmm_element_t elem = nullptr;
402 for (int i = 0; i < var->cnsts_number; i++) {
403 elem = &(var->cnsts[i]);
404 if (elem->constraint == cnst) {
411 XBT_DEBUG("cnst %p is not found in var %p", cnst, var);
417 XBT_DEBUG("remove elem(value %f, cnst %p, var %p) in var %p", elem->consumption_weight, elem->constraint,
418 elem->variable, var);
420 /* We are going to change the constraint object and the variable object.
421 * Propagate this change to other objects. Calling here before removing variable from not active elements
422 * (inactive elements are not visited)
424 lmm_update_modified_set(sys, cnst);
425 //Useful in case var was already removed from the constraint
426 lmm_update_modified_set(sys, var->cnsts[0].constraint); // will look up enabled_element_set of this constraint, and
427 //then each var in the enabled_element_set, and each var->cnsts[i].
429 if(xbt_swag_remove(elem, &(elem->constraint->enabled_element_set)))
430 lmm_decrease_concurrency(elem);
432 xbt_swag_remove(elem, &(elem->constraint->active_element_set));
433 elem->constraint = nullptr;
434 elem->variable = nullptr;
435 elem->consumption_weight = 0;
437 var->cnsts_number -= 1;
439 //No variable in this constraint -> make it inactive
440 if (xbt_swag_size(&(cnst->enabled_element_set))+xbt_swag_size(&(cnst->disabled_element_set)) == 0)
441 make_constraint_inactive(sys, cnst);
443 //Check maxconcurrency to see if we can enable new variables
444 lmm_on_disabled_var(sys,elem->constraint);
447 lmm_check_concurrency(sys);
450 void lmm_expand(lmm_system_t sys, lmm_constraint_t cnst, lmm_variable_t var, double consumption_weight)
454 //Check if this variable already has an active element in this constraint
455 //If it does, substract it from the required slack
456 int current_share = 0;
457 if(var->concurrency_share>1){
458 for (int i = 0; i < var->cnsts_number; i++) {
459 if(var->cnsts[i].constraint==cnst &&
460 xbt_swag_belongs(&var->cnsts[i],&(var->cnsts[i].constraint->enabled_element_set)))
461 current_share+=lmm_element_concurrency(&(var->cnsts[i]));
465 //Check if we need to disable the variable
466 if (var->sharing_weight > 0 && var->concurrency_share - current_share > lmm_concurrency_slack(cnst)) {
467 double weight = var->sharing_weight;
468 lmm_disable_var(sys,var);
469 for (int i = 0; i < var->cnsts_number; i++)
470 lmm_on_disabled_var(sys,var->cnsts[i].constraint);
471 consumption_weight = 0;
472 var->staged_weight=weight;
473 xbt_assert(not var->sharing_weight);
476 xbt_assert(var->cnsts_number < var->cnsts_size, "Too much constraints");
478 lmm_element_t elem = &(var->cnsts[var->cnsts_number++]);
480 elem->consumption_weight = consumption_weight;
481 elem->constraint = cnst;
482 elem->variable = var;
484 if (var->sharing_weight) {
485 xbt_swag_insert_at_head(elem, &(elem->constraint->enabled_element_set));
486 lmm_increase_concurrency(elem);
488 xbt_swag_insert_at_tail(elem, &(elem->constraint->disabled_element_set));
490 if (not sys->selective_update_active) {
491 make_constraint_active(sys, cnst);
492 } else if (elem->consumption_weight > 0 || var->sharing_weight > 0) {
493 make_constraint_active(sys, cnst);
494 lmm_update_modified_set(sys, cnst);
495 //TODOLATER: Why do we need this second call?
496 if (var->cnsts_number > 1)
497 lmm_update_modified_set(sys, var->cnsts[0].constraint);
500 lmm_check_concurrency(sys);
503 void lmm_expand_add(lmm_system_t sys, lmm_constraint_t cnst, lmm_variable_t var, double value)
508 lmm_check_concurrency(sys);
510 //BEWARE: In case you have multiple elements in one constraint, this will always add value to the first element.
511 for (i = 0; i < var->cnsts_number; i++)
512 if (var->cnsts[i].constraint == cnst)
515 if (i < var->cnsts_number) {
516 if (var->sharing_weight)
517 lmm_decrease_concurrency(&var->cnsts[i]);
519 if (cnst->sharing_policy)
520 var->cnsts[i].consumption_weight += value;
522 var->cnsts[i].consumption_weight = MAX(var->cnsts[i].consumption_weight, value);
524 //We need to check that increasing value of the element does not cross the concurrency limit
525 if (var->sharing_weight) {
526 if(lmm_concurrency_slack(cnst)<lmm_element_concurrency(&var->cnsts[i])){
527 double weight = var->sharing_weight;
528 lmm_disable_var(sys,var);
529 for (int j = 0; j < var->cnsts_number; j++)
530 lmm_on_disabled_var(sys,var->cnsts[j].constraint);
531 var->staged_weight=weight;
532 xbt_assert(not var->sharing_weight);
534 lmm_increase_concurrency(&var->cnsts[i]);
536 lmm_update_modified_set(sys, cnst);
538 lmm_expand(sys, cnst, var, value);
540 lmm_check_concurrency(sys);
543 lmm_constraint_t lmm_get_cnst_from_var(lmm_system_t /*sys*/, lmm_variable_t var, int num)
545 if (num < var->cnsts_number)
546 return (var->cnsts[num].constraint);
551 double lmm_get_cnst_weight_from_var(lmm_system_t /*sys*/, lmm_variable_t var, int num)
553 if (num < var->cnsts_number)
554 return (var->cnsts[num].consumption_weight);
559 int lmm_get_number_of_cnst_from_var(lmm_system_t /*sys*/, lmm_variable_t var)
561 return (var->cnsts_number);
564 lmm_variable_t lmm_get_var_from_cnst(lmm_system_t /*sys*/, lmm_constraint_t cnst, lmm_element_t * elem)
566 if (*elem == nullptr) {
567 // That is the first call, pick the first element among enabled_element_set (or disabled_element_set if
568 // enabled_element_set is empty)
569 *elem = (lmm_element_t) xbt_swag_getFirst(&(cnst->enabled_element_set));
570 if (*elem == nullptr)
571 *elem = (lmm_element_t) xbt_swag_getFirst(&(cnst->disabled_element_set));
573 //elem is not null, so we carry on
574 if(xbt_swag_belongs(*elem,&(cnst->enabled_element_set))){
575 //Look at enabled_element_set, and jump to disabled_element_set when finished
576 *elem = (lmm_element_t) xbt_swag_getNext(*elem, cnst->enabled_element_set.offset);
577 if (*elem == nullptr)
578 *elem = (lmm_element_t) xbt_swag_getFirst(&(cnst->disabled_element_set));
580 *elem = (lmm_element_t) xbt_swag_getNext(*elem, cnst->disabled_element_set.offset);
584 return (*elem)->variable;
589 //if we modify the swag between calls, normal version may loop forever
590 //this safe version ensures that we browse the swag elements only once
591 lmm_variable_t lmm_get_var_from_cnst_safe(lmm_system_t /*sys*/, lmm_constraint_t cnst, lmm_element_t * elem,
592 lmm_element_t * nextelem, int * numelem)
594 if (*elem == nullptr) {
595 *elem = (lmm_element_t) xbt_swag_getFirst(&(cnst->enabled_element_set));
596 *numelem = xbt_swag_size(&(cnst->enabled_element_set))+xbt_swag_size(&(cnst->disabled_element_set))-1;
597 if (*elem == nullptr)
598 *elem = (lmm_element_t) xbt_swag_getFirst(&(cnst->disabled_element_set));
607 //elem is not null, so we carry on
608 if(xbt_swag_belongs(*elem,&(cnst->enabled_element_set))){
609 //Look at enabled_element_set, and jump to disabled_element_set when finished
610 *nextelem = (lmm_element_t) xbt_swag_getNext(*elem, cnst->enabled_element_set.offset);
611 if (*nextelem == nullptr)
612 *nextelem = (lmm_element_t) xbt_swag_getFirst(&(cnst->disabled_element_set));
614 *nextelem = (lmm_element_t) xbt_swag_getNext(*elem, cnst->disabled_element_set.offset);
616 return (*elem)->variable;
621 void *lmm_constraint_id(lmm_constraint_t cnst)
626 void *lmm_variable_id(lmm_variable_t var)
631 static inline void saturated_constraint_set_update(double usage, int cnst_light_num,
632 dyn_light_t saturated_constraint_set, double *min_usage)
634 xbt_assert(usage > 0,"Impossible");
636 if (*min_usage < 0 || *min_usage > usage) {
638 XBT_HERE(" min_usage=%f (cnst->remaining / cnst->usage =%f)", *min_usage, usage);
639 saturated_constraint_set->data[0] = cnst_light_num;
640 saturated_constraint_set->pos = 1;
641 } else if (*min_usage == usage) {
642 if(saturated_constraint_set->pos == saturated_constraint_set->size) { // realloc the size
643 saturated_constraint_set->size *= 2;
644 saturated_constraint_set->data =
645 (int*) xbt_realloc(saturated_constraint_set->data, (saturated_constraint_set->size) * sizeof(int));
647 saturated_constraint_set->data[saturated_constraint_set->pos] = cnst_light_num;
648 saturated_constraint_set->pos++;
652 static inline void saturated_variable_set_update(s_lmm_constraint_light_t *cnst_light_tab,
653 dyn_light_t saturated_constraint_set, lmm_system_t sys)
655 /* Add active variables (i.e. variables that need to be set) from the set of constraints to saturate (cnst_light_tab)*/
656 lmm_constraint_light_t cnst = nullptr;
658 lmm_element_t elem = nullptr;
659 xbt_swag_t elem_list = nullptr;
661 for(i = 0; i< saturated_constraint_set->pos; i++){
662 cnst = &cnst_light_tab[saturated_constraint_set->data[i]];
663 elem_list = &(cnst->cnst->active_element_set);
664 xbt_swag_foreach(_elem, elem_list) {
665 elem = (lmm_element_t)_elem;
666 //Visiting active_element_set, so, by construction, should never get a zero weight, correct?
667 xbt_assert(elem->variable->sharing_weight > 0);
668 if (elem->consumption_weight > 0)
669 xbt_swag_insert(elem->variable, &(sys->saturated_variable_set));
674 void lmm_print(lmm_system_t sys)
676 std::string buf = std::string("MAX-MIN ( ");
679 /* Printing Objective */
680 xbt_swag_t var_list = &(sys->variable_set);
681 xbt_swag_foreach(_var, var_list) {
682 lmm_variable_t var = (lmm_variable_t)_var;
683 buf = buf + "'" + std::to_string(var->id_int) + "'(" + std::to_string(var->sharing_weight) + ") ";
686 XBT_DEBUG("%20s", buf.c_str());
689 XBT_DEBUG("Constraints");
690 /* Printing Constraints */
692 xbt_swag_t cnst_list = &(sys->active_constraint_set);
693 xbt_swag_foreach(_cnst, cnst_list) {
694 lmm_constraint_t cnst = (lmm_constraint_t)_cnst;
696 //Show the enabled variables
698 xbt_swag_t elem_list = &(cnst->enabled_element_set);
700 buf += ((cnst->sharing_policy) ? "(" : "max(");
701 xbt_swag_foreach(_elem, elem_list) {
702 lmm_element_t elem = (lmm_element_t)_elem;
703 buf = buf + std::to_string(elem->consumption_weight) + ".'" + std::to_string(elem->variable->id_int) + "'(" +
704 std::to_string(elem->variable->value) + ")" + ((cnst->sharing_policy) ? " + " : " , ");
705 if(cnst->sharing_policy)
706 sum += elem->consumption_weight * elem->variable->value;
708 sum = MAX(sum, elem->consumption_weight * elem->variable->value);
710 //TODO: Adding disabled elements only for test compatibility, but do we really want them to be printed?
711 elem_list = &(cnst->disabled_element_set);
712 xbt_swag_foreach(_elem, elem_list) {
713 lmm_element_t elem = (lmm_element_t)_elem;
714 buf = buf + std::to_string(elem->consumption_weight) + ".'" + std::to_string(elem->variable->id_int) + "'(" +
715 std::to_string(elem->variable->value) + ")" + ((cnst->sharing_policy) ? " + " : " , ");
716 if(cnst->sharing_policy)
717 sum += elem->consumption_weight * elem->variable->value;
719 sum = MAX(sum, elem->consumption_weight * elem->variable->value);
722 buf = buf + "0) <= " + std::to_string(cnst->bound) + " ('" + std::to_string(cnst->id_int) + "')";
724 if (not cnst->sharing_policy) {
725 buf += " [MAX-Constraint]";
727 XBT_DEBUG("%s", buf.c_str());
729 xbt_assert(not double_positive(sum - cnst->bound, cnst->bound * sg_maxmin_precision),
730 "Incorrect value (%f is not smaller than %f): %g", sum, cnst->bound, sum - cnst->bound);
733 XBT_DEBUG("Variables");
734 /* Printing Result */
735 xbt_swag_foreach(_var, var_list) {
736 lmm_variable_t var = (lmm_variable_t)_var;
737 if (var->bound > 0) {
738 XBT_DEBUG("'%d'(%f) : %f (<=%f)", var->id_int, var->sharing_weight, var->value, var->bound);
739 xbt_assert(not double_positive(var->value - var->bound, var->bound * sg_maxmin_precision),
740 "Incorrect value (%f is not smaller than %f", var->value, var->bound);
742 XBT_DEBUG("'%d'(%f) : %f", var->id_int, var->sharing_weight, var->value);
747 void lmm_solve(lmm_system_t sys)
752 double min_usage = -1;
753 double min_bound = -1;
755 if (not sys->modified)
758 XBT_IN("(sys=%p)", sys);
760 /* Compute Usage and store the variables that reach the maximum. If selective_update_active is true, only constraints
761 * that changed are considered. Otherwise all constraints with active actions are considered.
763 xbt_swag_t cnst_list = sys->selective_update_active ? &(sys->modified_constraint_set) : &(sys->active_constraint_set);
765 XBT_DEBUG("Active constraints : %d", xbt_swag_size(cnst_list));
766 /* Init: Only modified code portions: reset the value of active variables */
767 xbt_swag_foreach(_cnst, cnst_list) {
768 lmm_constraint_t cnst = (lmm_constraint_t)_cnst;
769 xbt_swag_t elem_list = &(cnst->enabled_element_set);
770 //XBT_DEBUG("Variable set : %d", xbt_swag_size(elem_list));
771 xbt_swag_foreach(_elem, elem_list) {
772 lmm_variable_t var = ((lmm_element_t)_elem)->variable;
773 xbt_assert(var->sharing_weight > 0.0);
778 s_lmm_constraint_light_t *cnst_light_tab =
779 (s_lmm_constraint_light_t *)xbt_malloc0(xbt_swag_size(cnst_list)*sizeof(s_lmm_constraint_light_t));
780 int cnst_light_num = 0;
781 dyn_light_t saturated_constraint_set = xbt_new0(s_dyn_light_t,1);
782 saturated_constraint_set->size = 5;
783 saturated_constraint_set->data = xbt_new0(int, saturated_constraint_set->size);
785 xbt_swag_foreach_safe(_cnst, _cnst_next, cnst_list) {
786 lmm_constraint_t cnst = (lmm_constraint_t)_cnst;
787 /* INIT: Collect constraints that actually need to be saturated (i.e remaining and usage are strictly positive)
788 * into cnst_light_tab. */
789 cnst->remaining = cnst->bound;
790 if (not double_positive(cnst->remaining, cnst->bound * sg_maxmin_precision))
793 xbt_swag_t elem_list = &(cnst->enabled_element_set);
794 xbt_swag_foreach(_elem, elem_list) {
795 lmm_element_t elem = (lmm_element_t)_elem;
796 xbt_assert(elem->variable->sharing_weight > 0);
797 if (elem->consumption_weight > 0) {
798 if (cnst->sharing_policy)
799 cnst->usage += elem->consumption_weight / elem->variable->sharing_weight;
800 else if (cnst->usage < elem->consumption_weight / elem->variable->sharing_weight)
801 cnst->usage = elem->consumption_weight / elem->variable->sharing_weight;
803 make_elem_active(elem);
804 simgrid::surf::Action *action = static_cast<simgrid::surf::Action*>(elem->variable->id);
805 if (sys->keep_track && not action->is_linked())
806 sys->keep_track->push_back(*action);
809 XBT_DEBUG("Constraint '%d' usage: %f remaining: %f concurrency: %i<=%i<=%i", cnst->id_int, cnst->usage,
810 cnst->remaining,cnst->concurrency_current,cnst->concurrency_maximum,cnst->concurrency_limit);
811 /* Saturated constraints update */
813 if(cnst->usage > 0) {
814 cnst_light_tab[cnst_light_num].cnst = cnst;
815 cnst->cnst_light = &(cnst_light_tab[cnst_light_num]);
816 cnst_light_tab[cnst_light_num].remaining_over_usage = cnst->remaining / cnst->usage;
817 saturated_constraint_set_update(cnst_light_tab[cnst_light_num].remaining_over_usage,
818 cnst_light_num, saturated_constraint_set, &min_usage);
819 xbt_assert(cnst->active_element_set.count>0, "There is no sense adding a constraint that has no active element!");
824 saturated_variable_set_update( cnst_light_tab, saturated_constraint_set, sys);
826 /* Saturated variables update */
828 /* Fix the variables that have to be */
829 xbt_swag_t var_list = &(sys->saturated_variable_set);
831 lmm_variable_t var = nullptr;
832 xbt_swag_foreach(_var, var_list) {
833 var = (lmm_variable_t)_var;
834 if (var->sharing_weight <= 0.0)
836 /* First check if some of these variables could reach their upper bound and update min_bound accordingly. */
837 XBT_DEBUG("var=%d, var->bound=%f, var->weight=%f, min_usage=%f, var->bound*var->weight=%f", var->id_int,
838 var->bound, var->sharing_weight, min_usage, var->bound * var->sharing_weight);
839 if ((var->bound > 0) && (var->bound * var->sharing_weight < min_usage)) {
841 min_bound = var->bound * var->sharing_weight;
843 min_bound = MIN(min_bound, (var->bound * var->sharing_weight));
844 XBT_DEBUG("Updated min_bound=%f", min_bound);
848 while ((var = (lmm_variable_t)xbt_swag_getFirst(var_list))) {
852 //If no variable could reach its bound, deal iteratively the constraints usage ( at worst one constraint is
853 // saturated at each cycle)
854 var->value = min_usage / var->sharing_weight;
855 // XBT_DEBUG("Setting %p (%d) value to %f\n", var, var->id_int, var->value);
856 XBT_DEBUG("Setting var (%d) value to %f\n", var->id_int, var->value);
858 //If there exist a variable that can reach its bound, only update it (and other with the same bound) for now.
859 if (double_equals(min_bound, var->bound * var->sharing_weight, sg_maxmin_precision)) {
860 var->value = var->bound;
861 XBT_DEBUG("Setting %p (%d) value to %f\n", var, var->id_int, var->value);
863 // Variables which bound is different are not considered for this cycle, but they will be afterwards.
864 XBT_DEBUG("Do not consider %p (%d) \n", var, var->id_int);
865 xbt_swag_remove(var, var_list);
869 XBT_DEBUG("Min usage: %f, Var(%d)->weight: %f, Var(%d)->value: %f ", min_usage, var->id_int, var->sharing_weight,
870 var->id_int, var->value);
872 /* Update the usage of contraints where this variable is involved */
873 for (i = 0; i < var->cnsts_number; i++) {
874 lmm_element_t elem = &var->cnsts[i];
875 lmm_constraint_t cnst = elem->constraint;
876 if (cnst->sharing_policy) {
877 //Remember: shared constraints require that sum(elem->value * var->value) < cnst->bound
878 double_update(&(cnst->remaining), elem->consumption_weight * var->value, cnst->bound * sg_maxmin_precision);
879 double_update(&(cnst->usage), elem->consumption_weight / var->sharing_weight, sg_maxmin_precision);
880 //If the constraint is saturated, remove it from the set of active constraints (light_tab)
881 if (not double_positive(cnst->usage, sg_maxmin_precision) ||
882 not double_positive(cnst->remaining, cnst->bound * sg_maxmin_precision)) {
883 if (cnst->cnst_light) {
884 int index = (cnst->cnst_light-cnst_light_tab);
885 XBT_DEBUG("index: %d \t cnst_light_num: %d \t || usage: %f remaining: %f bound: %f ",
886 index,cnst_light_num, cnst->usage, cnst->remaining, cnst->bound);
887 //XBT_DEBUG("index: %d \t cnst_light_num: %d \t || \t cnst: %p \t cnst->cnst_light: %p "
888 // "\t cnst_light_tab: %p usage: %f remaining: %f bound: %f ", index,cnst_light_num,
889 // cnst, cnst->cnst_light, cnst_light_tab, cnst->usage, cnst->remaining, cnst->bound);
890 cnst_light_tab[index]=cnst_light_tab[cnst_light_num-1];
891 cnst_light_tab[index].cnst->cnst_light = &cnst_light_tab[index];
893 cnst->cnst_light = nullptr;
896 cnst->cnst_light->remaining_over_usage = cnst->remaining / cnst->usage;
898 make_elem_inactive(elem);
900 //Remember: non-shared constraints only require that max(elem->value * var->value) < cnst->bound
902 make_elem_inactive(elem);
903 xbt_swag_t elem_list = &(cnst->enabled_element_set);
904 xbt_swag_foreach(_elem, elem_list) {
905 elem = (lmm_element_t)_elem;
906 xbt_assert(elem->variable->sharing_weight > 0);
907 if (elem->variable->value > 0) continue;
908 if (elem->consumption_weight > 0)
909 cnst->usage = MAX(cnst->usage, elem->consumption_weight / elem->variable->sharing_weight);
911 //If the constraint is saturated, remove it from the set of active constraints (light_tab)
912 if (not double_positive(cnst->usage, sg_maxmin_precision) ||
913 not double_positive(cnst->remaining, cnst->bound * sg_maxmin_precision)) {
914 if(cnst->cnst_light) {
915 int index = (cnst->cnst_light-cnst_light_tab);
916 XBT_DEBUG("index: %d \t cnst_light_num: %d \t || \t cnst: %p \t cnst->cnst_light: %p "
917 "\t cnst_light_tab: %p usage: %f remaining: %f bound: %f ", index,cnst_light_num, cnst,
918 cnst->cnst_light, cnst_light_tab, cnst->usage, cnst->remaining, cnst->bound);
919 cnst_light_tab[index]=cnst_light_tab[cnst_light_num-1];
920 cnst_light_tab[index].cnst->cnst_light = &cnst_light_tab[index];
922 cnst->cnst_light = nullptr;
925 cnst->cnst_light->remaining_over_usage = cnst->remaining / cnst->usage;
926 xbt_assert(cnst->active_element_set.count>0, "Should not keep a maximum constraint that has no active"
927 " element! You want to check the maxmin precision and possible rounding effects." );
931 xbt_swag_remove(var, var_list);
934 /* Find out which variables reach the maximum */
937 saturated_constraint_set->pos = 0;
939 for(pos=0; pos<cnst_light_num; pos++){
940 xbt_assert(cnst_light_tab[pos].cnst->active_element_set.count>0, "Cannot saturate more a constraint that has"
941 " no active element! You may want to change the maxmin precision (--cfg=maxmin/precision:<new_value>)"
942 " because of possible rounding effects.\n\tFor the record, the usage of this constraint is %g while "
943 "the maxmin precision to which it is compared is %g.\n\tThe usage of the previous constraint is %g.",
944 cnst_light_tab[pos].cnst->usage, sg_maxmin_precision, cnst_light_tab[pos-1].cnst->usage);
945 saturated_constraint_set_update(cnst_light_tab[pos].remaining_over_usage, pos, saturated_constraint_set,
949 saturated_variable_set_update(cnst_light_tab, saturated_constraint_set, sys);
951 } while (cnst_light_num > 0);
954 if (sys->selective_update_active)
955 lmm_remove_all_modified_set(sys);
957 if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
961 lmm_check_concurrency(sys);
963 xbt_free(saturated_constraint_set->data);
964 xbt_free(saturated_constraint_set);
965 xbt_free(cnst_light_tab);
969 /** \brief Attribute the value bound to var->bound.
971 * \param sys the lmm_system_t
972 * \param var the lmm_variable_t
973 * \param bound the new bound to associate with var
975 * Makes var->bound equal to bound. Whenever this function is called a change is signed in the system. To
976 * avoid false system changing detection it is a good idea to test (bound != 0) before calling it.
978 void lmm_update_variable_bound(lmm_system_t sys, lmm_variable_t var, double bound)
983 if (var->cnsts_number)
984 lmm_update_modified_set(sys, var->cnsts[0].constraint);
987 int lmm_concurrency_slack(lmm_constraint_t cnstr){
988 //FIXME MARTIN: Replace by infinite value std::numeric_limits<int>::(max)(), or something better within Simgrid?
989 if(cnstr->concurrency_limit<0)
992 return cnstr->concurrency_limit - cnstr->concurrency_current;
995 /** \brief Measure the minimum concurrency slack across all constraints where the given var is involved */
996 int lmm_cnstrs_min_concurrency_slack(lmm_variable_t var){
997 int minslack = std::numeric_limits<int>::max();
998 for (int i = 0; i < var->cnsts_number; i++) {
999 int slack = lmm_concurrency_slack(var->cnsts[i].constraint);
1001 //This is only an optimization, to avoid looking at more constraints when slack is already zero
1002 //Disable it when debugging to let lmm_concurrency_slack catch nasty things
1003 if (not slack && not XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug))
1013 /* /Check if a variable can be enabled
1015 * Make sure to set staged_weight before, if your intent is only to check concurrency
1017 int lmm_can_enable_var(lmm_variable_t var){
1018 return var->staged_weight>0 && lmm_cnstrs_min_concurrency_slack(var)>=var->concurrency_share;
1021 //Small remark: In this implementation of lmm_enable_var and lmm_disable_var, we will meet multiple times with var when
1022 // running lmm_update_modified_set.
1023 //A priori not a big performance issue, but we might do better by calling lmm_update_modified_set within the for loops
1024 // (after doing the first for enabling==1, and before doing the last for disabling==1)
1025 void lmm_enable_var(lmm_system_t sys, lmm_variable_t var){
1026 xbt_assert(lmm_can_enable_var(var));
1028 var->sharing_weight = var->staged_weight;
1029 var->staged_weight = 0;
1031 // Enabling the variable, move to var to list head. Subtlety is: here, we need to call lmm_update_modified_set AFTER
1032 // moving at least one element of var.
1034 xbt_swag_remove(var, &(sys->variable_set));
1035 xbt_swag_insert_at_head(var, &(sys->variable_set));
1036 for (int i = 0; i < var->cnsts_number; i++) {
1037 lmm_element_t elem = &var->cnsts[i];
1038 xbt_swag_remove(elem, &(elem->constraint->disabled_element_set));
1039 xbt_swag_insert_at_head(elem, &(elem->constraint->enabled_element_set));
1040 lmm_increase_concurrency(elem);
1042 if (var->cnsts_number)
1043 lmm_update_modified_set(sys, var->cnsts[0].constraint);
1045 //When used within lmm_on_disabled_var, we would get an assertion fail, because transiently there can be variables
1046 // that are staged and could be activated.
1047 //Anyway, caller functions all call lmm_check_concurrency() in the end.
1048 // lmm_check_concurrency(sys);
1051 void lmm_disable_var(lmm_system_t sys, lmm_variable_t var){
1052 xbt_assert(not var->staged_weight, "Staged weight should have been cleared");
1053 // Disabling the variable, move to var to list tail. Subtlety is: here, we need to call lmm_update_modified_set BEFORE
1054 // moving the last element of var.
1055 xbt_swag_remove(var, &(sys->variable_set));
1056 xbt_swag_insert_at_tail(var, &(sys->variable_set));
1057 if (var->cnsts_number)
1058 lmm_update_modified_set(sys, var->cnsts[0].constraint);
1059 for (int i = 0; i < var->cnsts_number; i++) {
1060 lmm_element_t elem = &var->cnsts[i];
1061 xbt_swag_remove(elem, &(elem->constraint->enabled_element_set));
1062 xbt_swag_insert_at_tail(elem, &(elem->constraint->disabled_element_set));
1064 xbt_swag_remove(elem, &(elem->constraint->active_element_set));
1066 lmm_decrease_concurrency(elem);
1069 var->sharing_weight = 0.0;
1070 var->staged_weight=0.0;
1072 lmm_check_concurrency(sys);
1075 /* /brief Find variables that can be enabled and enable them.
1077 * Assuming that the variable has already been removed from non-zero weights
1078 * Can we find a staged variable to add?
1079 * If yes, check that none of the constraints that this variable is involved in is at the limit of its concurrency
1080 * And then add it to enabled variables
1082 void lmm_on_disabled_var(lmm_system_t sys, lmm_constraint_t cnstr){
1084 if(cnstr->concurrency_limit<0)
1087 int numelem = xbt_swag_size(&(cnstr->disabled_element_set));
1091 lmm_element_t elem = (lmm_element_t)xbt_swag_getFirst(&(cnstr->disabled_element_set));
1093 //Cannot use xbt_swag_foreach, because lmm_enable_var will modify disabled_element_set.. within the loop
1094 while (numelem-- && elem) {
1096 lmm_element_t nextelem = (lmm_element_t)xbt_swag_getNext(elem, cnstr->disabled_element_set.offset);
1098 if (elem->variable->staged_weight>0 ){
1099 //Found a staged variable
1100 //TODOLATER: Add random timing function to model reservation protocol fuzziness? Then how to make sure that
1101 //staged variables will eventually be called?
1102 if(lmm_can_enable_var(elem->variable)){
1103 lmm_enable_var(sys,elem->variable);
1107 xbt_assert(cnstr->concurrency_current<=cnstr->concurrency_limit,"Concurrency overflow!");
1108 if(cnstr->concurrency_current==cnstr->concurrency_limit)
1114 //We could get an assertion fail, because transiently there can be variables that are staged and could be activated.
1115 //And we need to go through all constraints of the disabled var before getting back a coherent state.
1116 //Anyway, caller functions all call lmm_check_concurrency() in the end.
1117 // lmm_check_concurrency(sys);
1120 /* \brief update the weight of a variable, and enable/disable it.
1121 * @return Returns whether a change was made
1123 void lmm_update_variable_weight(lmm_system_t sys, lmm_variable_t var, double weight)
1125 xbt_assert(weight>=0,"Variable weight should not be negative!");
1127 if (weight == var->sharing_weight)
1130 int enabling_var = (weight > 0 && var->sharing_weight <= 0);
1131 int disabling_var = (weight <= 0 && var->sharing_weight > 0);
1133 XBT_IN("(sys=%p, var=%p, weight=%f)", sys, var, weight);
1137 //Are we enabling this variable?
1139 var->staged_weight = weight;
1140 int minslack = lmm_cnstrs_min_concurrency_slack(var);
1141 if (minslack < var->concurrency_share) {
1142 XBT_DEBUG("Staging var (instead of enabling) because min concurrency slack %i, with weight %f and concurrency"
1143 " share %i", minslack, weight, var->concurrency_share);
1146 XBT_DEBUG("Enabling var with min concurrency slack %i", minslack);
1147 lmm_enable_var(sys,var);
1148 } else if (disabling_var){
1149 //Are we disabling this variable?
1150 lmm_disable_var(sys,var);
1152 var->sharing_weight = weight;
1155 lmm_check_concurrency(sys);
1160 double lmm_get_variable_weight(lmm_variable_t var)
1162 return var->sharing_weight;
1165 void lmm_update_constraint_bound(lmm_system_t sys, lmm_constraint_t cnst, double bound)
1168 lmm_update_modified_set(sys, cnst);
1169 cnst->bound = bound;
1172 int lmm_constraint_used(lmm_system_t sys, lmm_constraint_t cnst)
1174 return xbt_swag_belongs(cnst, &(sys->active_constraint_set));
1177 inline lmm_constraint_t lmm_get_first_active_constraint(lmm_system_t sys)
1179 return (lmm_constraint_t)xbt_swag_getFirst(&(sys->active_constraint_set));
1182 inline lmm_constraint_t lmm_get_next_active_constraint(lmm_system_t sys, lmm_constraint_t cnst)
1184 return (lmm_constraint_t)xbt_swag_getNext(cnst, (sys->active_constraint_set).offset);
1187 /** \brief Update the constraint set propagating recursively to other constraints so the system should not be entirely
1190 * \param sys the lmm_system_t
1191 * \param cnst the lmm_constraint_t affected by the change
1193 * A recursive algorithm to optimize the system recalculation selecting only constraints that have changed. Each
1194 * constraint change is propagated to the list of constraints for each variable.
1196 static void lmm_update_modified_set_rec(lmm_system_t sys, lmm_constraint_t cnst)
1200 //TODOLATER: Why lmm_modified_set has been changed in git version 2392B5157...? Looks equivalent logically and less obvious..
1201 xbt_swag_foreach(_elem, &cnst->enabled_element_set) {
1202 lmm_variable_t var = ((lmm_element_t)_elem)->variable;
1203 s_lmm_element_t *cnsts = var->cnsts;
1205 for (i = 0; var->visited != sys->visited_counter && i < var->cnsts_number ; i++) {
1206 if (cnsts[i].constraint != cnst && not xbt_swag_belongs(cnsts[i].constraint, &sys->modified_constraint_set)) {
1207 xbt_swag_insert(cnsts[i].constraint, &sys->modified_constraint_set);
1208 lmm_update_modified_set_rec(sys, cnsts[i].constraint);
1211 //var will be ignored in later visits as long as sys->visited_counter does not move
1212 var->visited = sys->visited_counter;
1216 static void lmm_update_modified_set(lmm_system_t sys, lmm_constraint_t cnst)
1218 /* nothing to do if selective update isn't active */
1219 if (sys->selective_update_active && not xbt_swag_belongs(cnst, &sys->modified_constraint_set)) {
1220 xbt_swag_insert(cnst, &sys->modified_constraint_set);
1221 lmm_update_modified_set_rec(sys, cnst);
1225 /** \brief Remove all constraints of the modified_constraint_set.
1227 * \param sys the lmm_system_t
1229 static void lmm_remove_all_modified_set(lmm_system_t sys)
1231 //We cleverly un-flag all variables just by incrementing sys->visited_counter
1232 //In effect, the var->visited value will no more be equal to sys->visited counter
1233 //To be clean, when visited counter has wrapped around, we force these var->visited values so that variables that
1234 //were in the modified a long (long long) time ago are not wrongly skipped here, which would lead to very nasty bugs
1235 //(i.e. not readibily reproducible, and requiring a lot of run time before happening).
1236 if (++sys->visited_counter == 1) {
1237 /* the counter wrapped around, reset each variable->visited */
1239 xbt_swag_foreach(_var, &sys->variable_set)
1240 ((lmm_variable_t)_var)->visited = 0;
1242 xbt_swag_reset(&sys->modified_constraint_set);
1246 * Returns resource load (in flop per second, or byte per second, or similar)
1248 * If the resource is shared (the default case), the load is sum of resource usage made by every variables located on
1251 * If the resource is not shared (ie in FATPIPE mode), then the load is the max (not the sum) of all resource usages
1252 * located on this resource.
1254 * \param cnst the lmm_constraint_t associated to the resource
1256 double lmm_constraint_get_usage(lmm_constraint_t cnst) {
1258 xbt_swag_t elem_list = &(cnst->enabled_element_set);
1261 xbt_swag_foreach(_elem, elem_list)
1263 lmm_element_t elem = (lmm_element_t)_elem;
1264 if (elem->consumption_weight > 0) {
1265 if (cnst->sharing_policy)
1266 usage += elem->consumption_weight * elem->variable->value;
1267 else if (usage < elem->consumption_weight * elem->variable->value)
1268 usage = std::max(usage, elem->consumption_weight * elem->variable->value);
1274 int lmm_constraint_get_variable_amount(lmm_constraint_t cnst) {
1276 xbt_swag_t elem_list = &(cnst->enabled_element_set);
1279 xbt_swag_foreach(_elem, elem_list) {
1280 lmm_element_t elem = (lmm_element_t)_elem;
1281 if (elem->consumption_weight > 0)