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"
18 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_maxmin, surf, "Logging specific to SURF (maxmin)");
20 typedef std::vector<int> dyn_light_t;
22 double sg_maxmin_precision = 0.00001; /* Change this with --cfg=maxmin/precision:VALUE */
23 double sg_surf_precision = 0.00001; /* Change this with --cfg=surf/precision:VALUE */
24 int sg_concurrency_limit = -1; /* Change this with --cfg=maxmin/concurrency-limit:VALUE */
26 static void *lmm_variable_mallocator_new_f();
27 static void lmm_variable_mallocator_free_f(void *var);
28 #define lmm_variable_mallocator_reset_f ((void_f_pvoid_t)nullptr)
29 static void lmm_update_modified_set(lmm_system_t sys, 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 inline void lmm_cnst_free(lmm_system_t sys, lmm_constraint_t cnst);
36 static void lmm_on_disabled_var(lmm_system_t sys, lmm_constraint_t cnstr);
37 static void lmm_enable_var(lmm_system_t sys, lmm_variable_t var);
38 static int lmm_can_enable_var(lmm_variable_t var);
39 static void lmm_disable_var(lmm_system_t sys, lmm_variable_t var);
40 static int lmm_concurrency_slack(lmm_constraint_t cnstr);
41 static int lmm_cnstrs_min_concurrency_slack(lmm_variable_t var);
43 inline int lmm_element_concurrency(lmm_element_t elem) {
44 //Ignore element with weight less than one (e.g. cross-traffic)
45 return (elem->consumption_weight >= 1) ? 1 : 0;
46 //There are other alternatives, but they will change the behaviour of the model..
47 //So do not use it unless you want to make a new model.
48 //If you do, remember to change the variables concurrency share to reflect it.
49 //Potential examples are:
50 //return (elem->weight>0)?1:0;//Include element as soon as weight is non-zero
51 //return (int)ceil(elem->weight);//Include element as the rounded-up integer value of the element weight
54 inline void lmm_decrease_concurrency(lmm_element_t elem) {
55 xbt_assert(elem->constraint->concurrency_current>=lmm_element_concurrency(elem));
56 elem->constraint->concurrency_current-=lmm_element_concurrency(elem);
59 inline void lmm_increase_concurrency(lmm_element_t elem) {
60 elem->constraint->concurrency_current+= lmm_element_concurrency(elem);
62 lmm_constraint_t cnstr=elem->constraint;
64 if(cnstr->concurrency_current > cnstr->concurrency_maximum)
65 cnstr->concurrency_maximum= cnstr->concurrency_current;
67 xbt_assert(cnstr->concurrency_limit<0 || cnstr->concurrency_current<=cnstr->concurrency_limit,
68 "Concurrency limit overflow!");
71 static void lmm_check_concurrency(lmm_system_t sys)
73 // These checks are very expensive, so do them only if we want to debug SURF LMM
74 if (not XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug))
78 xbt_swag_foreach(cnstIt, &(sys->constraint_set))
80 lmm_constraint_t cnst = (lmm_constraint_t)cnstIt;
83 xbt_swag_foreach(elemIt, &(cnst->enabled_element_set))
85 lmm_element_t elem = (lmm_element_t)elemIt;
86 xbt_assert(elem->variable->sharing_weight > 0);
87 concurrency += lmm_element_concurrency(elem);
90 xbt_swag_foreach(elemIt, &(cnst->disabled_element_set))
92 lmm_element_t elem = (lmm_element_t)elemIt;
93 // We should have staged variables only if concurrency is reached in some constraint
94 xbt_assert(cnst->concurrency_limit < 0 || elem->variable->staged_weight == 0 ||
95 lmm_cnstrs_min_concurrency_slack(elem->variable) < elem->variable->concurrency_share,
96 "should not have staged variable!");
99 xbt_assert(cnst->concurrency_limit < 0 || cnst->concurrency_limit >= concurrency, "concurrency check failed!");
100 xbt_assert(cnst->concurrency_current == concurrency, "concurrency_current is out-of-date!");
103 // Check that for each variable, all corresponding elements are in the same state (i.e. same element sets)
105 xbt_swag_foreach(varIt, &(sys->variable_set))
107 lmm_variable_t var = (lmm_variable_t)varIt;
109 if (not var->cnsts_number)
112 lmm_element_t elem = &var->cnsts[0];
113 int belong_to_enabled = xbt_swag_belongs(elem, &(elem->constraint->enabled_element_set));
114 int belong_to_disabled = xbt_swag_belongs(elem, &(elem->constraint->disabled_element_set));
115 int belong_to_active = xbt_swag_belongs(elem, &(elem->constraint->active_element_set));
117 for (int i = 1; i < var->cnsts_number; i++) {
118 elem = &var->cnsts[i];
119 xbt_assert(belong_to_enabled == xbt_swag_belongs(elem, &(elem->constraint->enabled_element_set)),
120 "Variable inconsistency (1): enabled_element_set");
121 xbt_assert(belong_to_disabled == xbt_swag_belongs(elem, &(elem->constraint->disabled_element_set)),
122 "Variable inconsistency (2): disabled_element_set");
123 xbt_assert(belong_to_active == xbt_swag_belongs(elem, &(elem->constraint->active_element_set)),
124 "Variable inconsistency (3): active_element_set");
129 static inline void lmm_variable_remove(lmm_system_t sys, lmm_variable_t var)
131 XBT_IN("(sys=%p, var=%p)", sys, var);
134 // TODOLATER Can do better than that by leaving only the variable in only one enabled_element_set, call
135 // lmm_update_modified_set, and then remove it..
136 if (var->cnsts_number)
137 lmm_update_modified_set(sys, var->cnsts[0].constraint);
139 for (int i = 0; i < var->cnsts_number; i++) {
140 lmm_element_t elem = &var->cnsts[i];
141 if (var->sharing_weight > 0)
142 lmm_decrease_concurrency(elem);
143 xbt_swag_remove(elem, &(elem->constraint->enabled_element_set));
144 xbt_swag_remove(elem, &(elem->constraint->disabled_element_set));
145 xbt_swag_remove(elem, &(elem->constraint->active_element_set));
146 int nelements = xbt_swag_size(&(elem->constraint->enabled_element_set)) +
147 xbt_swag_size(&(elem->constraint->disabled_element_set));
149 make_constraint_inactive(sys, elem->constraint);
151 lmm_on_disabled_var(sys, elem->constraint);
154 // Check if we can enable new variables going through the constraints where var was.
155 // Do it after removing all elements, so he first disabled variables get priority over those with smaller requirement
156 for (int i = 0; i < var->cnsts_number; i++) {
157 lmm_element_t elem = &var->cnsts[i];
158 if (xbt_swag_size(&(elem->constraint->disabled_element_set)))
159 lmm_on_disabled_var(sys, elem->constraint);
162 var->cnsts_number = 0;
164 lmm_check_concurrency(sys);
169 static void lmm_var_free(lmm_system_t sys, lmm_variable_t var)
171 lmm_variable_remove(sys, var);
172 xbt_mallocator_release(sys->variable_mallocator, var);
175 lmm_system_t lmm_system_new(bool selective_update)
177 s_lmm_variable_t var;
178 s_lmm_constraint_t cnst;
180 lmm_system_t l = new s_lmm_system_t();
183 l->selective_update_active = selective_update;
184 l->visited_counter = 1;
186 XBT_DEBUG("Setting selective_update_active flag to %d", l->selective_update_active);
188 xbt_swag_init(&(l->variable_set), xbt_swag_offset(var, variable_set_hookup));
189 xbt_swag_init(&(l->constraint_set), xbt_swag_offset(cnst, constraint_set_hookup));
191 xbt_swag_init(&(l->active_constraint_set), xbt_swag_offset(cnst, active_constraint_set_hookup));
193 xbt_swag_init(&(l->modified_constraint_set), xbt_swag_offset(cnst, modified_constraint_set_hookup));
194 xbt_swag_init(&(l->saturated_variable_set), xbt_swag_offset(var, saturated_variable_set_hookup));
195 xbt_swag_init(&(l->saturated_constraint_set), xbt_swag_offset(cnst, saturated_constraint_set_hookup));
197 l->variable_mallocator = xbt_mallocator_new(65536,
198 lmm_variable_mallocator_new_f,
199 lmm_variable_mallocator_free_f,
200 lmm_variable_mallocator_reset_f);
202 l->solve_fun = &lmm_solve;
207 void lmm_system_free(lmm_system_t sys)
209 lmm_variable_t var = nullptr;
210 lmm_constraint_t cnst = nullptr;
215 while ((var = (lmm_variable_t) extract_variable(sys))) {
217 char* demangled = abi::__cxa_demangle(typeid(*var->id).name(), 0, 0, &status);
219 XBT_WARN("Probable bug: a %s variable (#%d) not removed before the LMM system destruction.", demangled,
222 lmm_var_free(sys, var);
224 while ((cnst = (lmm_constraint_t) extract_constraint(sys)))
225 lmm_cnst_free(sys, cnst);
227 xbt_mallocator_free(sys->variable_mallocator);
231 static inline void lmm_cnst_free(lmm_system_t sys, lmm_constraint_t cnst)
233 make_constraint_inactive(sys, cnst);
237 lmm_constraint_t lmm_constraint_new(lmm_system_t sys, void *id, double bound_value)
239 lmm_constraint_t cnst = nullptr;
240 s_lmm_element_t elem;
242 cnst = new s_lmm_constraint_t();
244 cnst->id_int = Global_const_debug_id++;
245 xbt_swag_init(&(cnst->enabled_element_set), xbt_swag_offset(elem, enabled_element_set_hookup));
246 xbt_swag_init(&(cnst->disabled_element_set), xbt_swag_offset(elem, disabled_element_set_hookup));
247 xbt_swag_init(&(cnst->active_element_set), xbt_swag_offset(elem, active_element_set_hookup));
249 cnst->bound = bound_value;
250 cnst->concurrency_maximum=0;
251 cnst->concurrency_current=0;
252 cnst->concurrency_limit = sg_concurrency_limit;
254 cnst->sharing_policy = 1; /* FIXME: don't hardcode the value */
255 insert_constraint(sys, cnst);
260 int lmm_constraint_concurrency_limit_get(lmm_constraint_t cnst)
262 return cnst->concurrency_limit;
265 void lmm_constraint_concurrency_limit_set(lmm_constraint_t cnst, int concurrency_limit)
267 xbt_assert(concurrency_limit<0 || cnst->concurrency_maximum<=concurrency_limit,
268 "New concurrency limit should be larger than observed concurrency maximum. Maybe you want to call"
269 " lmm_constraint_concurrency_maximum_reset() to reset the maximum?");
270 cnst->concurrency_limit = concurrency_limit;
273 void lmm_constraint_concurrency_maximum_reset(lmm_constraint_t cnst)
275 cnst->concurrency_maximum = 0;
278 int lmm_constraint_concurrency_maximum_get(lmm_constraint_t cnst)
280 xbt_assert(cnst->concurrency_limit<0 || cnst->concurrency_maximum<=cnst->concurrency_limit,
281 "Very bad: maximum observed concurrency is higher than limit. This is a bug of SURF, please report it.");
282 return cnst->concurrency_maximum;
285 void lmm_constraint_shared(lmm_constraint_t cnst)
287 cnst->sharing_policy = 0;
290 /** Return true if the constraint is shared, and false if it's FATPIPE */
291 int lmm_constraint_sharing_policy(lmm_constraint_t cnst)
293 return (cnst->sharing_policy);
296 /* @brief Remove a constraint
297 * Currently this is dead code, but it is exposed in maxmin.hpp
298 * Apparently, this call was designed assuming that constraint would no more have elements in it.
299 * If not the case, assertion will fail, and you need to add calls e.g. to lmm_shrink before effectively removing it.
301 inline void lmm_constraint_free(lmm_system_t sys,lmm_constraint_t cnst)
303 xbt_assert(not xbt_swag_size(&(cnst->active_element_set)), "Removing constraint but it still has active elements");
304 xbt_assert(not xbt_swag_size(&(cnst->enabled_element_set)), "Removing constraint but it still has enabled elements");
305 xbt_assert(not xbt_swag_size(&(cnst->disabled_element_set)),
306 "Removing constraint but it still has disabled elements");
307 remove_constraint(sys, cnst);
308 lmm_cnst_free(sys, cnst);
311 static void *lmm_variable_mallocator_new_f()
313 lmm_variable_t var = new s_lmm_variable_t;
314 var->cnsts = nullptr; /* will be created by realloc */
318 static void lmm_variable_mallocator_free_f(void *var)
320 xbt_free(((lmm_variable_t) var)->cnsts);
321 delete static_cast<lmm_variable_t>(var);
324 lmm_variable_t lmm_variable_new(lmm_system_t sys, simgrid::surf::Action* id, double sharing_weight, double bound,
325 int number_of_constraints)
327 XBT_IN("(sys=%p, id=%p, weight=%f, bound=%f, num_cons =%d)", sys, id, sharing_weight, bound, number_of_constraints);
329 lmm_variable_t var = (lmm_variable_t)xbt_mallocator_get(sys->variable_mallocator);
331 var->id_int = Global_debug_id++;
332 var->cnsts = static_cast<s_lmm_element_t*>(xbt_realloc(var->cnsts, number_of_constraints * sizeof(s_lmm_element_t)));
333 for (int i = 0; i < number_of_constraints; i++) {
334 var->cnsts[i].enabled_element_set_hookup.next = nullptr;
335 var->cnsts[i].enabled_element_set_hookup.prev = nullptr;
336 var->cnsts[i].disabled_element_set_hookup.next = nullptr;
337 var->cnsts[i].disabled_element_set_hookup.prev = nullptr;
338 var->cnsts[i].active_element_set_hookup.next = nullptr;
339 var->cnsts[i].active_element_set_hookup.prev = nullptr;
340 var->cnsts[i].constraint = nullptr;
341 var->cnsts[i].variable = nullptr;
342 var->cnsts[i].consumption_weight = 0.0;
344 var->cnsts_size = number_of_constraints;
345 var->cnsts_number = 0;
346 var->sharing_weight = sharing_weight;
347 var->staged_weight = 0.0;
349 var->concurrency_share = 1;
351 var->visited = sys->visited_counter - 1;
354 var->func_f = func_f_def;
355 var->func_fp = func_fp_def;
356 var->func_fpi = func_fpi_def;
358 var->variable_set_hookup.next = nullptr;
359 var->variable_set_hookup.prev = nullptr;
360 var->saturated_variable_set_hookup.next = nullptr;
361 var->saturated_variable_set_hookup.prev = nullptr;
364 xbt_swag_insert_at_head(var, &(sys->variable_set));
366 xbt_swag_insert_at_tail(var, &(sys->variable_set));
368 XBT_OUT(" returns %p", var);
372 void lmm_variable_free(lmm_system_t sys, lmm_variable_t var)
374 remove_variable(sys, var);
375 lmm_var_free(sys, var);
378 double lmm_variable_getvalue(lmm_variable_t var)
383 void lmm_variable_concurrency_share_set(lmm_variable_t var, short int concurrency_share)
385 var->concurrency_share=concurrency_share;
388 double lmm_variable_getbound(lmm_variable_t var)
393 void lmm_shrink(lmm_system_t sys, lmm_constraint_t cnst, lmm_variable_t var)
395 lmm_element_t elem = nullptr;
398 for (int i = 0; i < var->cnsts_number; i++) {
399 elem = &(var->cnsts[i]);
400 if (elem->constraint == cnst) {
407 XBT_DEBUG("cnst %p is not found in var %p", cnst, var);
413 XBT_DEBUG("remove elem(value %f, cnst %p, var %p) in var %p", elem->consumption_weight, elem->constraint,
414 elem->variable, var);
416 /* We are going to change the constraint object and the variable object.
417 * Propagate this change to other objects. Calling here before removing variable from not active elements
418 * (inactive elements are not visited)
420 lmm_update_modified_set(sys, cnst);
421 //Useful in case var was already removed from the constraint
422 lmm_update_modified_set(sys, var->cnsts[0].constraint); // will look up enabled_element_set of this constraint, and
423 //then each var in the enabled_element_set, and each var->cnsts[i].
425 if(xbt_swag_remove(elem, &(elem->constraint->enabled_element_set)))
426 lmm_decrease_concurrency(elem);
428 xbt_swag_remove(elem, &(elem->constraint->active_element_set));
429 elem->constraint = nullptr;
430 elem->variable = nullptr;
431 elem->consumption_weight = 0;
433 var->cnsts_number -= 1;
435 //No variable in this constraint -> make it inactive
436 if (xbt_swag_size(&(cnst->enabled_element_set))+xbt_swag_size(&(cnst->disabled_element_set)) == 0)
437 make_constraint_inactive(sys, cnst);
439 //Check maxconcurrency to see if we can enable new variables
440 lmm_on_disabled_var(sys,elem->constraint);
443 lmm_check_concurrency(sys);
446 void lmm_expand(lmm_system_t sys, lmm_constraint_t cnst, lmm_variable_t var, double consumption_weight)
450 //Check if this variable already has an active element in this constraint
451 //If it does, substract it from the required slack
452 int current_share = 0;
453 if(var->concurrency_share>1){
454 for (int i = 0; i < var->cnsts_number; i++) {
455 if(var->cnsts[i].constraint==cnst &&
456 xbt_swag_belongs(&var->cnsts[i],&(var->cnsts[i].constraint->enabled_element_set)))
457 current_share+=lmm_element_concurrency(&(var->cnsts[i]));
461 //Check if we need to disable the variable
462 if (var->sharing_weight > 0 && var->concurrency_share - current_share > lmm_concurrency_slack(cnst)) {
463 double weight = var->sharing_weight;
464 lmm_disable_var(sys,var);
465 for (int i = 0; i < var->cnsts_number; i++)
466 lmm_on_disabled_var(sys,var->cnsts[i].constraint);
467 consumption_weight = 0;
468 var->staged_weight=weight;
469 xbt_assert(not var->sharing_weight);
472 xbt_assert(var->cnsts_number < var->cnsts_size, "Too much constraints");
474 lmm_element_t elem = &(var->cnsts[var->cnsts_number++]);
476 elem->consumption_weight = consumption_weight;
477 elem->constraint = cnst;
478 elem->variable = var;
480 if (var->sharing_weight) {
481 xbt_swag_insert_at_head(elem, &(elem->constraint->enabled_element_set));
482 lmm_increase_concurrency(elem);
484 xbt_swag_insert_at_tail(elem, &(elem->constraint->disabled_element_set));
486 if (not sys->selective_update_active) {
487 make_constraint_active(sys, cnst);
488 } else if (elem->consumption_weight > 0 || var->sharing_weight > 0) {
489 make_constraint_active(sys, cnst);
490 lmm_update_modified_set(sys, cnst);
491 //TODOLATER: Why do we need this second call?
492 if (var->cnsts_number > 1)
493 lmm_update_modified_set(sys, var->cnsts[0].constraint);
496 lmm_check_concurrency(sys);
499 void lmm_expand_add(lmm_system_t sys, lmm_constraint_t cnst, lmm_variable_t var, double value)
504 lmm_check_concurrency(sys);
506 //BEWARE: In case you have multiple elements in one constraint, this will always add value to the first element.
507 for (i = 0; i < var->cnsts_number; i++)
508 if (var->cnsts[i].constraint == cnst)
511 if (i < var->cnsts_number) {
512 if (var->sharing_weight)
513 lmm_decrease_concurrency(&var->cnsts[i]);
515 if (cnst->sharing_policy)
516 var->cnsts[i].consumption_weight += value;
518 var->cnsts[i].consumption_weight = MAX(var->cnsts[i].consumption_weight, value);
520 //We need to check that increasing value of the element does not cross the concurrency limit
521 if (var->sharing_weight) {
522 if(lmm_concurrency_slack(cnst)<lmm_element_concurrency(&var->cnsts[i])){
523 double weight = var->sharing_weight;
524 lmm_disable_var(sys,var);
525 for (int j = 0; j < var->cnsts_number; j++)
526 lmm_on_disabled_var(sys,var->cnsts[j].constraint);
527 var->staged_weight=weight;
528 xbt_assert(not var->sharing_weight);
530 lmm_increase_concurrency(&var->cnsts[i]);
532 lmm_update_modified_set(sys, cnst);
534 lmm_expand(sys, cnst, var, value);
536 lmm_check_concurrency(sys);
539 lmm_constraint_t lmm_get_cnst_from_var(lmm_system_t /*sys*/, lmm_variable_t var, int num)
541 if (num < var->cnsts_number)
542 return (var->cnsts[num].constraint);
547 double lmm_get_cnst_weight_from_var(lmm_system_t /*sys*/, lmm_variable_t var, int num)
549 if (num < var->cnsts_number)
550 return (var->cnsts[num].consumption_weight);
555 int lmm_get_number_of_cnst_from_var(lmm_system_t /*sys*/, lmm_variable_t var)
557 return (var->cnsts_number);
560 lmm_variable_t lmm_get_var_from_cnst(lmm_system_t /*sys*/, lmm_constraint_t cnst, lmm_element_t * elem)
562 if (*elem == nullptr) {
563 // That is the first call, pick the first element among enabled_element_set (or disabled_element_set if
564 // enabled_element_set is empty)
565 *elem = (lmm_element_t) xbt_swag_getFirst(&(cnst->enabled_element_set));
566 if (*elem == nullptr)
567 *elem = (lmm_element_t) xbt_swag_getFirst(&(cnst->disabled_element_set));
569 //elem is not null, so we carry on
570 if(xbt_swag_belongs(*elem,&(cnst->enabled_element_set))){
571 //Look at enabled_element_set, and jump to disabled_element_set when finished
572 *elem = (lmm_element_t) xbt_swag_getNext(*elem, cnst->enabled_element_set.offset);
573 if (*elem == nullptr)
574 *elem = (lmm_element_t) xbt_swag_getFirst(&(cnst->disabled_element_set));
576 *elem = (lmm_element_t) xbt_swag_getNext(*elem, cnst->disabled_element_set.offset);
580 return (*elem)->variable;
585 //if we modify the swag between calls, normal version may loop forever
586 //this safe version ensures that we browse the swag elements only once
587 lmm_variable_t lmm_get_var_from_cnst_safe(lmm_system_t /*sys*/, lmm_constraint_t cnst, lmm_element_t * elem,
588 lmm_element_t * nextelem, int * numelem)
590 if (*elem == nullptr) {
591 *elem = (lmm_element_t) xbt_swag_getFirst(&(cnst->enabled_element_set));
592 *numelem = xbt_swag_size(&(cnst->enabled_element_set))+xbt_swag_size(&(cnst->disabled_element_set))-1;
593 if (*elem == nullptr)
594 *elem = (lmm_element_t) xbt_swag_getFirst(&(cnst->disabled_element_set));
603 //elem is not null, so we carry on
604 if(xbt_swag_belongs(*elem,&(cnst->enabled_element_set))){
605 //Look at enabled_element_set, and jump to disabled_element_set when finished
606 *nextelem = (lmm_element_t) xbt_swag_getNext(*elem, cnst->enabled_element_set.offset);
607 if (*nextelem == nullptr)
608 *nextelem = (lmm_element_t) xbt_swag_getFirst(&(cnst->disabled_element_set));
610 *nextelem = (lmm_element_t) xbt_swag_getNext(*elem, cnst->disabled_element_set.offset);
612 return (*elem)->variable;
617 void *lmm_constraint_id(lmm_constraint_t cnst)
622 void *lmm_variable_id(lmm_variable_t var)
627 static inline void saturated_constraint_set_update(double usage, int cnst_light_num,
628 dyn_light_t& saturated_constraint_set, double* min_usage)
630 xbt_assert(usage > 0,"Impossible");
632 if (*min_usage < 0 || *min_usage > usage) {
634 XBT_HERE(" min_usage=%f (cnst->remaining / cnst->usage =%f)", *min_usage, usage);
635 saturated_constraint_set.assign(1, cnst_light_num);
636 } else if (*min_usage == usage) {
637 saturated_constraint_set.emplace_back(cnst_light_num);
641 static inline void saturated_variable_set_update(s_lmm_constraint_light_t* cnst_light_tab,
642 const dyn_light_t& saturated_constraint_set, lmm_system_t sys)
644 /* Add active variables (i.e. variables that need to be set) from the set of constraints to saturate (cnst_light_tab)*/
645 for (int const& saturated_cnst : saturated_constraint_set) {
646 lmm_constraint_light_t cnst = &cnst_light_tab[saturated_cnst];
648 xbt_swag_t elem_list = &(cnst->cnst->active_element_set);
649 xbt_swag_foreach(_elem, elem_list) {
650 lmm_element_t elem = (lmm_element_t)_elem;
651 //Visiting active_element_set, so, by construction, should never get a zero weight, correct?
652 xbt_assert(elem->variable->sharing_weight > 0);
653 if (elem->consumption_weight > 0)
654 xbt_swag_insert(elem->variable, &(sys->saturated_variable_set));
659 void lmm_print(lmm_system_t sys)
661 std::string buf = std::string("MAX-MIN ( ");
664 /* Printing Objective */
665 xbt_swag_t var_list = &(sys->variable_set);
666 xbt_swag_foreach(_var, var_list) {
667 lmm_variable_t var = (lmm_variable_t)_var;
668 buf = buf + "'" + std::to_string(var->id_int) + "'(" + std::to_string(var->sharing_weight) + ") ";
671 XBT_DEBUG("%20s", buf.c_str());
674 XBT_DEBUG("Constraints");
675 /* Printing Constraints */
677 xbt_swag_t cnst_list = &(sys->active_constraint_set);
678 xbt_swag_foreach(_cnst, cnst_list) {
679 lmm_constraint_t cnst = (lmm_constraint_t)_cnst;
681 //Show the enabled variables
683 xbt_swag_t elem_list = &(cnst->enabled_element_set);
685 buf += ((cnst->sharing_policy) ? "(" : "max(");
686 xbt_swag_foreach(_elem, elem_list) {
687 lmm_element_t elem = (lmm_element_t)_elem;
688 buf = buf + std::to_string(elem->consumption_weight) + ".'" + std::to_string(elem->variable->id_int) + "'(" +
689 std::to_string(elem->variable->value) + ")" + ((cnst->sharing_policy) ? " + " : " , ");
690 if(cnst->sharing_policy)
691 sum += elem->consumption_weight * elem->variable->value;
693 sum = MAX(sum, elem->consumption_weight * elem->variable->value);
695 //TODO: Adding disabled elements only for test compatibility, but do we really want them to be printed?
696 elem_list = &(cnst->disabled_element_set);
697 xbt_swag_foreach(_elem, elem_list) {
698 lmm_element_t elem = (lmm_element_t)_elem;
699 buf = buf + std::to_string(elem->consumption_weight) + ".'" + std::to_string(elem->variable->id_int) + "'(" +
700 std::to_string(elem->variable->value) + ")" + ((cnst->sharing_policy) ? " + " : " , ");
701 if(cnst->sharing_policy)
702 sum += elem->consumption_weight * elem->variable->value;
704 sum = MAX(sum, elem->consumption_weight * elem->variable->value);
707 buf = buf + "0) <= " + std::to_string(cnst->bound) + " ('" + std::to_string(cnst->id_int) + "')";
709 if (not cnst->sharing_policy) {
710 buf += " [MAX-Constraint]";
712 XBT_DEBUG("%s", buf.c_str());
714 xbt_assert(not double_positive(sum - cnst->bound, cnst->bound * sg_maxmin_precision),
715 "Incorrect value (%f is not smaller than %f): %g", sum, cnst->bound, sum - cnst->bound);
718 XBT_DEBUG("Variables");
719 /* Printing Result */
720 xbt_swag_foreach(_var, var_list) {
721 lmm_variable_t var = (lmm_variable_t)_var;
722 if (var->bound > 0) {
723 XBT_DEBUG("'%d'(%f) : %f (<=%f)", var->id_int, var->sharing_weight, var->value, var->bound);
724 xbt_assert(not double_positive(var->value - var->bound, var->bound * sg_maxmin_precision),
725 "Incorrect value (%f is not smaller than %f", var->value, var->bound);
727 XBT_DEBUG("'%d'(%f) : %f", var->id_int, var->sharing_weight, var->value);
732 void lmm_solve(lmm_system_t sys)
737 double min_usage = -1;
738 double min_bound = -1;
740 if (not sys->modified)
743 XBT_IN("(sys=%p)", sys);
745 /* Compute Usage and store the variables that reach the maximum. If selective_update_active is true, only constraints
746 * that changed are considered. Otherwise all constraints with active actions are considered.
748 xbt_swag_t cnst_list = sys->selective_update_active ? &(sys->modified_constraint_set) : &(sys->active_constraint_set);
750 XBT_DEBUG("Active constraints : %d", xbt_swag_size(cnst_list));
751 /* Init: Only modified code portions: reset the value of active variables */
752 xbt_swag_foreach(_cnst, cnst_list) {
753 lmm_constraint_t cnst = (lmm_constraint_t)_cnst;
754 xbt_swag_t elem_list = &(cnst->enabled_element_set);
755 xbt_swag_foreach(_elem, elem_list) {
756 lmm_variable_t var = ((lmm_element_t)_elem)->variable;
757 xbt_assert(var->sharing_weight > 0.0);
762 s_lmm_constraint_light_t* cnst_light_tab = new s_lmm_constraint_light_t[xbt_swag_size(cnst_list)]();
763 int cnst_light_num = 0;
764 dyn_light_t saturated_constraint_set;
766 xbt_swag_foreach_safe(_cnst, _cnst_next, cnst_list) {
767 lmm_constraint_t cnst = (lmm_constraint_t)_cnst;
768 /* INIT: Collect constraints that actually need to be saturated (i.e remaining and usage are strictly positive)
769 * into cnst_light_tab. */
770 cnst->remaining = cnst->bound;
771 if (not double_positive(cnst->remaining, cnst->bound * sg_maxmin_precision))
774 xbt_swag_t elem_list = &(cnst->enabled_element_set);
775 xbt_swag_foreach(_elem, elem_list) {
776 lmm_element_t elem = (lmm_element_t)_elem;
777 xbt_assert(elem->variable->sharing_weight > 0);
778 if (elem->consumption_weight > 0) {
779 if (cnst->sharing_policy)
780 cnst->usage += elem->consumption_weight / elem->variable->sharing_weight;
781 else if (cnst->usage < elem->consumption_weight / elem->variable->sharing_weight)
782 cnst->usage = elem->consumption_weight / elem->variable->sharing_weight;
784 make_elem_active(elem);
785 simgrid::surf::Action *action = static_cast<simgrid::surf::Action*>(elem->variable->id);
786 if (sys->keep_track && not action->is_linked())
787 sys->keep_track->push_back(*action);
790 XBT_DEBUG("Constraint '%d' usage: %f remaining: %f concurrency: %i<=%i<=%i", cnst->id_int, cnst->usage,
791 cnst->remaining,cnst->concurrency_current,cnst->concurrency_maximum,cnst->concurrency_limit);
792 /* Saturated constraints update */
794 if(cnst->usage > 0) {
795 cnst_light_tab[cnst_light_num].cnst = cnst;
796 cnst->cnst_light = &(cnst_light_tab[cnst_light_num]);
797 cnst_light_tab[cnst_light_num].remaining_over_usage = cnst->remaining / cnst->usage;
798 saturated_constraint_set_update(cnst_light_tab[cnst_light_num].remaining_over_usage,
799 cnst_light_num, saturated_constraint_set, &min_usage);
800 xbt_assert(cnst->active_element_set.count>0, "There is no sense adding a constraint that has no active element!");
805 saturated_variable_set_update( cnst_light_tab, saturated_constraint_set, sys);
807 /* Saturated variables update */
809 /* Fix the variables that have to be */
810 xbt_swag_t var_list = &(sys->saturated_variable_set);
812 lmm_variable_t var = nullptr;
813 xbt_swag_foreach(_var, var_list) {
814 var = (lmm_variable_t)_var;
815 if (var->sharing_weight <= 0.0)
817 /* First check if some of these variables could reach their upper bound and update min_bound accordingly. */
818 XBT_DEBUG("var=%d, var->bound=%f, var->weight=%f, min_usage=%f, var->bound*var->weight=%f", var->id_int,
819 var->bound, var->sharing_weight, min_usage, var->bound * var->sharing_weight);
820 if ((var->bound > 0) && (var->bound * var->sharing_weight < min_usage)) {
822 min_bound = var->bound * var->sharing_weight;
824 min_bound = MIN(min_bound, (var->bound * var->sharing_weight));
825 XBT_DEBUG("Updated min_bound=%f", min_bound);
829 while ((var = (lmm_variable_t)xbt_swag_getFirst(var_list))) {
833 //If no variable could reach its bound, deal iteratively the constraints usage ( at worst one constraint is
834 // saturated at each cycle)
835 var->value = min_usage / var->sharing_weight;
836 XBT_DEBUG("Setting var (%d) value to %f\n", var->id_int, var->value);
838 //If there exist a variable that can reach its bound, only update it (and other with the same bound) for now.
839 if (double_equals(min_bound, var->bound * var->sharing_weight, sg_maxmin_precision)) {
840 var->value = var->bound;
841 XBT_DEBUG("Setting %p (%d) value to %f\n", var, var->id_int, var->value);
843 // Variables which bound is different are not considered for this cycle, but they will be afterwards.
844 XBT_DEBUG("Do not consider %p (%d) \n", var, var->id_int);
845 xbt_swag_remove(var, var_list);
849 XBT_DEBUG("Min usage: %f, Var(%d)->weight: %f, Var(%d)->value: %f ", min_usage, var->id_int, var->sharing_weight,
850 var->id_int, var->value);
852 /* Update the usage of contraints where this variable is involved */
853 for (i = 0; i < var->cnsts_number; i++) {
854 lmm_element_t elem = &var->cnsts[i];
855 lmm_constraint_t cnst = elem->constraint;
856 if (cnst->sharing_policy) {
857 //Remember: shared constraints require that sum(elem->value * var->value) < cnst->bound
858 double_update(&(cnst->remaining), elem->consumption_weight * var->value, cnst->bound * sg_maxmin_precision);
859 double_update(&(cnst->usage), elem->consumption_weight / var->sharing_weight, sg_maxmin_precision);
860 //If the constraint is saturated, remove it from the set of active constraints (light_tab)
861 if (not double_positive(cnst->usage, sg_maxmin_precision) ||
862 not double_positive(cnst->remaining, cnst->bound * sg_maxmin_precision)) {
863 if (cnst->cnst_light) {
864 int index = (cnst->cnst_light-cnst_light_tab);
865 XBT_DEBUG("index: %d \t cnst_light_num: %d \t || usage: %f remaining: %f bound: %f ",
866 index,cnst_light_num, cnst->usage, cnst->remaining, cnst->bound);
867 cnst_light_tab[index]=cnst_light_tab[cnst_light_num-1];
868 cnst_light_tab[index].cnst->cnst_light = &cnst_light_tab[index];
870 cnst->cnst_light = nullptr;
873 cnst->cnst_light->remaining_over_usage = cnst->remaining / cnst->usage;
875 make_elem_inactive(elem);
877 //Remember: non-shared constraints only require that max(elem->value * var->value) < cnst->bound
879 make_elem_inactive(elem);
880 xbt_swag_t elem_list = &(cnst->enabled_element_set);
881 xbt_swag_foreach(_elem, elem_list) {
882 elem = (lmm_element_t)_elem;
883 xbt_assert(elem->variable->sharing_weight > 0);
884 if (elem->variable->value > 0) continue;
885 if (elem->consumption_weight > 0)
886 cnst->usage = MAX(cnst->usage, elem->consumption_weight / elem->variable->sharing_weight);
888 //If the constraint is saturated, remove it from the set of active constraints (light_tab)
889 if (not double_positive(cnst->usage, sg_maxmin_precision) ||
890 not double_positive(cnst->remaining, cnst->bound * sg_maxmin_precision)) {
891 if(cnst->cnst_light) {
892 int index = (cnst->cnst_light-cnst_light_tab);
893 XBT_DEBUG("index: %d \t cnst_light_num: %d \t || \t cnst: %p \t cnst->cnst_light: %p "
894 "\t cnst_light_tab: %p usage: %f remaining: %f bound: %f ", index,cnst_light_num, cnst,
895 cnst->cnst_light, cnst_light_tab, cnst->usage, cnst->remaining, cnst->bound);
896 cnst_light_tab[index]=cnst_light_tab[cnst_light_num-1];
897 cnst_light_tab[index].cnst->cnst_light = &cnst_light_tab[index];
899 cnst->cnst_light = nullptr;
902 cnst->cnst_light->remaining_over_usage = cnst->remaining / cnst->usage;
903 xbt_assert(cnst->active_element_set.count>0, "Should not keep a maximum constraint that has no active"
904 " element! You want to check the maxmin precision and possible rounding effects." );
908 xbt_swag_remove(var, var_list);
911 /* Find out which variables reach the maximum */
914 saturated_constraint_set.clear();
916 for(pos=0; pos<cnst_light_num; pos++){
917 xbt_assert(cnst_light_tab[pos].cnst->active_element_set.count>0, "Cannot saturate more a constraint that has"
918 " no active element! You may want to change the maxmin precision (--cfg=maxmin/precision:<new_value>)"
919 " because of possible rounding effects.\n\tFor the record, the usage of this constraint is %g while "
920 "the maxmin precision to which it is compared is %g.\n\tThe usage of the previous constraint is %g.",
921 cnst_light_tab[pos].cnst->usage, sg_maxmin_precision, cnst_light_tab[pos-1].cnst->usage);
922 saturated_constraint_set_update(cnst_light_tab[pos].remaining_over_usage, pos, saturated_constraint_set,
926 saturated_variable_set_update(cnst_light_tab, saturated_constraint_set, sys);
928 } while (cnst_light_num > 0);
931 if (sys->selective_update_active)
932 lmm_remove_all_modified_set(sys);
934 if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
938 lmm_check_concurrency(sys);
940 delete[] cnst_light_tab;
944 /** \brief Attribute the value bound to var->bound.
946 * \param sys the lmm_system_t
947 * \param var the lmm_variable_t
948 * \param bound the new bound to associate with var
950 * Makes var->bound equal to bound. Whenever this function is called a change is signed in the system. To
951 * avoid false system changing detection it is a good idea to test (bound != 0) before calling it.
953 void lmm_update_variable_bound(lmm_system_t sys, lmm_variable_t var, double bound)
958 if (var->cnsts_number)
959 lmm_update_modified_set(sys, var->cnsts[0].constraint);
962 int lmm_concurrency_slack(lmm_constraint_t cnstr){
963 //FIXME MARTIN: Replace by infinite value std::numeric_limits<int>::(max)(), or something better within Simgrid?
964 if(cnstr->concurrency_limit<0)
967 return cnstr->concurrency_limit - cnstr->concurrency_current;
970 /** \brief Measure the minimum concurrency slack across all constraints where the given var is involved */
971 int lmm_cnstrs_min_concurrency_slack(lmm_variable_t var){
972 int minslack = std::numeric_limits<int>::max();
973 for (int i = 0; i < var->cnsts_number; i++) {
974 int slack = lmm_concurrency_slack(var->cnsts[i].constraint);
976 //This is only an optimization, to avoid looking at more constraints when slack is already zero
977 //Disable it when debugging to let lmm_concurrency_slack catch nasty things
978 if (not slack && not XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug))
988 /* /Check if a variable can be enabled
990 * Make sure to set staged_weight before, if your intent is only to check concurrency
992 int lmm_can_enable_var(lmm_variable_t var){
993 return var->staged_weight>0 && lmm_cnstrs_min_concurrency_slack(var)>=var->concurrency_share;
996 //Small remark: In this implementation of lmm_enable_var and lmm_disable_var, we will meet multiple times with var when
997 // running lmm_update_modified_set.
998 //A priori not a big performance issue, but we might do better by calling lmm_update_modified_set within the for loops
999 // (after doing the first for enabling==1, and before doing the last for disabling==1)
1000 void lmm_enable_var(lmm_system_t sys, lmm_variable_t var){
1001 xbt_assert(lmm_can_enable_var(var));
1003 var->sharing_weight = var->staged_weight;
1004 var->staged_weight = 0;
1006 // Enabling the variable, move to var to list head. Subtlety is: here, we need to call lmm_update_modified_set AFTER
1007 // moving at least one element of var.
1009 xbt_swag_remove(var, &(sys->variable_set));
1010 xbt_swag_insert_at_head(var, &(sys->variable_set));
1011 for (int i = 0; i < var->cnsts_number; i++) {
1012 lmm_element_t elem = &var->cnsts[i];
1013 xbt_swag_remove(elem, &(elem->constraint->disabled_element_set));
1014 xbt_swag_insert_at_head(elem, &(elem->constraint->enabled_element_set));
1015 lmm_increase_concurrency(elem);
1017 if (var->cnsts_number)
1018 lmm_update_modified_set(sys, var->cnsts[0].constraint);
1020 //When used within lmm_on_disabled_var, we would get an assertion fail, because transiently there can be variables
1021 // that are staged and could be activated.
1022 //Anyway, caller functions all call lmm_check_concurrency() in the end.
1025 void lmm_disable_var(lmm_system_t sys, lmm_variable_t var){
1026 xbt_assert(not var->staged_weight, "Staged weight should have been cleared");
1027 // Disabling the variable, move to var to list tail. Subtlety is: here, we need to call lmm_update_modified_set BEFORE
1028 // moving the last element of var.
1029 xbt_swag_remove(var, &(sys->variable_set));
1030 xbt_swag_insert_at_tail(var, &(sys->variable_set));
1031 if (var->cnsts_number)
1032 lmm_update_modified_set(sys, var->cnsts[0].constraint);
1033 for (int i = 0; i < var->cnsts_number; i++) {
1034 lmm_element_t elem = &var->cnsts[i];
1035 xbt_swag_remove(elem, &(elem->constraint->enabled_element_set));
1036 xbt_swag_insert_at_tail(elem, &(elem->constraint->disabled_element_set));
1038 xbt_swag_remove(elem, &(elem->constraint->active_element_set));
1040 lmm_decrease_concurrency(elem);
1043 var->sharing_weight = 0.0;
1044 var->staged_weight=0.0;
1046 lmm_check_concurrency(sys);
1049 /* /brief Find variables that can be enabled and enable them.
1051 * Assuming that the variable has already been removed from non-zero weights
1052 * Can we find a staged variable to add?
1053 * If yes, check that none of the constraints that this variable is involved in is at the limit of its concurrency
1054 * And then add it to enabled variables
1056 void lmm_on_disabled_var(lmm_system_t sys, lmm_constraint_t cnstr){
1058 if(cnstr->concurrency_limit<0)
1061 int numelem = xbt_swag_size(&(cnstr->disabled_element_set));
1065 lmm_element_t elem = (lmm_element_t)xbt_swag_getFirst(&(cnstr->disabled_element_set));
1067 //Cannot use xbt_swag_foreach, because lmm_enable_var will modify disabled_element_set.. within the loop
1068 while (numelem-- && elem) {
1070 lmm_element_t nextelem = (lmm_element_t)xbt_swag_getNext(elem, cnstr->disabled_element_set.offset);
1072 if (elem->variable->staged_weight>0 ){
1073 //Found a staged variable
1074 //TODOLATER: Add random timing function to model reservation protocol fuzziness? Then how to make sure that
1075 //staged variables will eventually be called?
1076 if(lmm_can_enable_var(elem->variable)){
1077 lmm_enable_var(sys,elem->variable);
1081 xbt_assert(cnstr->concurrency_current<=cnstr->concurrency_limit,"Concurrency overflow!");
1082 if(cnstr->concurrency_current==cnstr->concurrency_limit)
1088 //We could get an assertion fail, because transiently there can be variables that are staged and could be activated.
1089 //And we need to go through all constraints of the disabled var before getting back a coherent state.
1090 //Anyway, caller functions all call lmm_check_concurrency() in the end.
1093 /* \brief update the weight of a variable, and enable/disable it.
1094 * @return Returns whether a change was made
1096 void lmm_update_variable_weight(lmm_system_t sys, lmm_variable_t var, double weight)
1098 xbt_assert(weight>=0,"Variable weight should not be negative!");
1100 if (weight == var->sharing_weight)
1103 int enabling_var = (weight > 0 && var->sharing_weight <= 0);
1104 int disabling_var = (weight <= 0 && var->sharing_weight > 0);
1106 XBT_IN("(sys=%p, var=%p, weight=%f)", sys, var, weight);
1110 //Are we enabling this variable?
1112 var->staged_weight = weight;
1113 int minslack = lmm_cnstrs_min_concurrency_slack(var);
1114 if (minslack < var->concurrency_share) {
1115 XBT_DEBUG("Staging var (instead of enabling) because min concurrency slack %i, with weight %f and concurrency"
1116 " share %i", minslack, weight, var->concurrency_share);
1119 XBT_DEBUG("Enabling var with min concurrency slack %i", minslack);
1120 lmm_enable_var(sys,var);
1121 } else if (disabling_var){
1122 //Are we disabling this variable?
1123 lmm_disable_var(sys,var);
1125 var->sharing_weight = weight;
1128 lmm_check_concurrency(sys);
1133 double lmm_get_variable_weight(lmm_variable_t var)
1135 return var->sharing_weight;
1138 void lmm_update_constraint_bound(lmm_system_t sys, lmm_constraint_t cnst, double bound)
1141 lmm_update_modified_set(sys, cnst);
1142 cnst->bound = bound;
1145 int lmm_constraint_used(lmm_system_t sys, lmm_constraint_t cnst)
1147 return xbt_swag_belongs(cnst, &(sys->active_constraint_set));
1150 inline lmm_constraint_t lmm_get_first_active_constraint(lmm_system_t sys)
1152 return (lmm_constraint_t)xbt_swag_getFirst(&(sys->active_constraint_set));
1155 inline lmm_constraint_t lmm_get_next_active_constraint(lmm_system_t sys, lmm_constraint_t cnst)
1157 return (lmm_constraint_t)xbt_swag_getNext(cnst, (sys->active_constraint_set).offset);
1160 /** \brief Update the constraint set propagating recursively to other constraints so the system should not be entirely
1163 * \param sys the lmm_system_t
1164 * \param cnst the lmm_constraint_t affected by the change
1166 * A recursive algorithm to optimize the system recalculation selecting only constraints that have changed. Each
1167 * constraint change is propagated to the list of constraints for each variable.
1169 static void lmm_update_modified_set_rec(lmm_system_t sys, lmm_constraint_t cnst)
1173 //TODOLATER: Why lmm_modified_set has been changed in git version 2392B5157...? Looks equivalent logically and less obvious..
1174 xbt_swag_foreach(_elem, &cnst->enabled_element_set) {
1175 lmm_variable_t var = ((lmm_element_t)_elem)->variable;
1176 s_lmm_element_t *cnsts = var->cnsts;
1178 for (i = 0; var->visited != sys->visited_counter && i < var->cnsts_number ; i++) {
1179 if (cnsts[i].constraint != cnst && not xbt_swag_belongs(cnsts[i].constraint, &sys->modified_constraint_set)) {
1180 xbt_swag_insert(cnsts[i].constraint, &sys->modified_constraint_set);
1181 lmm_update_modified_set_rec(sys, cnsts[i].constraint);
1184 //var will be ignored in later visits as long as sys->visited_counter does not move
1185 var->visited = sys->visited_counter;
1189 static void lmm_update_modified_set(lmm_system_t sys, lmm_constraint_t cnst)
1191 /* nothing to do if selective update isn't active */
1192 if (sys->selective_update_active && not xbt_swag_belongs(cnst, &sys->modified_constraint_set)) {
1193 xbt_swag_insert(cnst, &sys->modified_constraint_set);
1194 lmm_update_modified_set_rec(sys, cnst);
1198 /** \brief Remove all constraints of the modified_constraint_set.
1200 * \param sys the lmm_system_t
1202 static void lmm_remove_all_modified_set(lmm_system_t sys)
1204 // We cleverly un-flag all variables just by incrementing sys->visited_counter
1205 // In effect, the var->visited value will no more be equal to sys->visited counter
1206 // To be clean, when visited counter has wrapped around, we force these var->visited values so that variables that
1207 // were in the modified a long long time ago are not wrongly skipped here, which would lead to very nasty bugs
1208 // (i.e. not readibily reproducible, and requiring a lot of run time before happening).
1209 if (++sys->visited_counter == 1) {
1210 /* the counter wrapped around, reset each variable->visited */
1212 xbt_swag_foreach(_var, &sys->variable_set)
1213 ((lmm_variable_t)_var)->visited = 0;
1215 xbt_swag_reset(&sys->modified_constraint_set);
1219 * Returns resource load (in flop per second, or byte per second, or similar)
1221 * If the resource is shared (the default case), the load is sum of resource usage made by every variables located on
1224 * If the resource is not shared (ie in FATPIPE mode), then the load is the max (not the sum) of all resource usages
1225 * located on this resource.
1227 * \param cnst the lmm_constraint_t associated to the resource
1229 double lmm_constraint_get_usage(lmm_constraint_t cnst) {
1231 xbt_swag_t elem_list = &(cnst->enabled_element_set);
1234 xbt_swag_foreach(_elem, elem_list)
1236 lmm_element_t elem = (lmm_element_t)_elem;
1237 if (elem->consumption_weight > 0) {
1238 if (cnst->sharing_policy)
1239 usage += elem->consumption_weight * elem->variable->value;
1240 else if (usage < elem->consumption_weight * elem->variable->value)
1241 usage = std::max(usage, elem->consumption_weight * elem->variable->value);
1247 int lmm_constraint_get_variable_amount(lmm_constraint_t cnst) {
1249 xbt_swag_t elem_list = &(cnst->enabled_element_set);
1252 xbt_swag_foreach(_elem, elem_list) {
1253 lmm_element_t elem = (lmm_element_t)_elem;
1254 if (elem->consumption_weight > 0)