3 /* Copyright (c) 2004 Arnaud Legrand. All rights reserved. */
5 /* This program is free software; you can redistribute it and/or modify it
6 * under the terms of the license (GNU LGPL) which comes with this package. */
9 #include "xbt/sysdep.h"
11 #include "xbt/mallocator.h"
12 #include "maxmin_private.h"
14 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_maxmin, surf,
15 "Logging specific to SURF (maxmin)");
17 static void* lmm_variable_mallocator_new_f(void);
18 static void lmm_variable_mallocator_free_f(void *var);
19 static void lmm_variable_mallocator_reset_f(void *var);
21 lmm_system_t lmm_system_new(void)
23 lmm_system_t l = NULL;
25 s_lmm_constraint_t cnst;
27 l = xbt_new0(s_lmm_system_t, 1);
30 xbt_swag_init(&(l->variable_set),
31 xbt_swag_offset(var, variable_set_hookup));
32 xbt_swag_init(&(l->constraint_set),
33 xbt_swag_offset(cnst, constraint_set_hookup));
35 xbt_swag_init(&(l->active_constraint_set),
36 xbt_swag_offset(cnst, active_constraint_set_hookup));
38 xbt_swag_init(&(l->saturated_variable_set),
39 xbt_swag_offset(var, saturated_variable_set_hookup));
40 xbt_swag_init(&(l->saturated_constraint_set),
41 xbt_swag_offset(cnst, saturated_constraint_set_hookup));
43 l->variable_mallocator = xbt_mallocator_new(64,
44 lmm_variable_mallocator_new_f,
45 lmm_variable_mallocator_free_f,
46 lmm_variable_mallocator_reset_f);
51 void lmm_system_free(lmm_system_t sys)
53 lmm_variable_t var = NULL;
54 lmm_constraint_t cnst = NULL;
56 while ((var = extract_variable(sys)))
57 lmm_var_free(sys, var);
59 while ((cnst = extract_constraint(sys)))
60 lmm_cnst_free(sys, cnst);
62 xbt_mallocator_free(sys->variable_mallocator);
66 void lmm_variable_disable(lmm_system_t sys, lmm_variable_t var)
69 lmm_element_t elem = NULL;
71 XBT_IN2("(sys=%p, var=%p)",sys,var);
74 for (i = 0; i < var->cnsts_number; i++) {
75 elem = &var->cnsts[i];
76 xbt_swag_remove(elem, &(elem->constraint->element_set));
77 xbt_swag_remove(elem, &(elem->constraint->active_element_set));
78 if (!xbt_swag_size(&(elem->constraint->element_set)))
79 make_constraint_inactive(sys, elem->constraint);
81 var->cnsts_number = 0;
85 static void lmm_var_free(lmm_system_t sys, lmm_variable_t var)
88 lmm_variable_disable(sys, var);
90 xbt_mallocator_release(sys->variable_mallocator, var);
93 static void lmm_cnst_free(lmm_system_t sys, lmm_constraint_t cnst)
95 /* xbt_assert0(xbt_swag_size(&(cnst->element_set)), */
96 /* "This list should be empty!"); */
97 remove_active_constraint(sys, cnst);
101 lmm_constraint_t lmm_constraint_new(lmm_system_t sys, void *id,
104 lmm_constraint_t cnst = NULL;
105 s_lmm_element_t elem;
107 cnst = xbt_new0(s_lmm_constraint_t, 1);
109 xbt_swag_init(&(cnst->element_set),
110 xbt_swag_offset(elem, element_set_hookup));
111 xbt_swag_init(&(cnst->active_element_set),
112 xbt_swag_offset(elem, active_element_set_hookup));
114 cnst->bound = bound_value;
117 insert_constraint(sys, cnst);
122 void lmm_constraint_shared(lmm_constraint_t cnst)
127 void lmm_constraint_free(lmm_system_t sys, lmm_constraint_t cnst)
129 remove_constraint(sys, cnst);
130 lmm_cnst_free(sys, cnst);
133 static void* lmm_variable_mallocator_new_f(void) {
134 return xbt_new(s_lmm_variable_t, 1);
137 static void lmm_variable_mallocator_free_f(void *var) {
141 static void lmm_variable_mallocator_reset_f(void *var) {
142 /* memset to zero like calloc */
143 memset(var, 0, sizeof(s_lmm_variable_t));
146 lmm_variable_t lmm_variable_new(lmm_system_t sys, void *id,
148 double bound, int number_of_constraints)
150 lmm_variable_t var = NULL;
153 XBT_IN5("(sys=%p, id=%p, weight=%f, bound=%f, num_cons =%d)",
154 sys,id,weight,bound,number_of_constraints);
156 var = xbt_mallocator_get(sys->variable_mallocator);
158 var->cnsts = xbt_new0(s_lmm_element_t, number_of_constraints);
159 for(i=0; i<number_of_constraints; i++) {
160 /* Should be useless because of the
161 calloc but it seems to help valgrind... */
162 var->cnsts[i].element_set_hookup.next = NULL;
163 var->cnsts[i].element_set_hookup.prev = NULL;
164 var->cnsts[i].active_element_set_hookup.next = NULL;
165 var->cnsts[i].active_element_set_hookup.prev = NULL;
166 var->cnsts[i].constraint = NULL;
167 var->cnsts[i].variable = NULL;
168 var->cnsts[i].value = 0.0;
170 var->cnsts_size = number_of_constraints;
171 var->cnsts_number = 0; /* Should be useless because of the
172 calloc but it seems to help valgrind... */
173 var->weight = weight;
176 if(weight) xbt_swag_insert_at_head(var,&(sys->variable_set));
177 else xbt_swag_insert_at_tail(var,&(sys->variable_set));
182 void lmm_variable_free(lmm_system_t sys, lmm_variable_t var)
184 remove_variable(sys, var);
185 lmm_var_free(sys, var);
188 double lmm_variable_getvalue(lmm_variable_t var)
193 void lmm_expand(lmm_system_t sys, lmm_constraint_t cnst,
194 lmm_variable_t var, double value)
196 lmm_element_t elem = NULL;
200 xbt_assert0(var->cnsts_number < var->cnsts_size,
201 "Too much constraints");
203 elem = &(var->cnsts[var->cnsts_number++]);
206 elem->constraint = cnst;
207 elem->variable = var;
209 if(var->weight) xbt_swag_insert_at_head(elem,&(elem->constraint->element_set));
210 else xbt_swag_insert_at_tail(elem,&(elem->constraint->element_set));
212 make_constraint_active(sys, cnst);
215 void lmm_expand_add(lmm_system_t sys, lmm_constraint_t cnst,
216 lmm_variable_t var, double value)
221 for(i=0; i< var->cnsts_number ; i++)
222 if(var->cnsts[i].constraint == cnst) break;
224 if(i<var->cnsts_number) var->cnsts[i].value +=value;
225 else lmm_expand(sys,cnst,var,value);
228 void lmm_elem_set_value(lmm_system_t sys, lmm_constraint_t cnst,
229 lmm_variable_t var, double value)
233 for(i=0; i< var->cnsts_number ; i++)
234 if(var->cnsts[i].constraint == cnst) break;
236 if(i<var->cnsts_number) {
237 var->cnsts[i].value =value;
239 } else DIE_IMPOSSIBLE;
242 lmm_constraint_t lmm_get_cnst_from_var(lmm_system_t sys,
243 lmm_variable_t var, int num)
245 if (num < var->cnsts_number)
246 return (var->cnsts[num].constraint);
251 int lmm_get_number_of_cnst_from_var(lmm_system_t sys, lmm_variable_t var)
253 return (var->cnsts_number);
256 lmm_variable_t lmm_get_var_from_cnst(lmm_system_t sys,
257 lmm_constraint_t cnst,
258 lmm_variable_t * var)
261 xbt_swag_getFirst(&(cnst->element_set));
263 *var = xbt_swag_getNext(*var, cnst->element_set.offset);
267 void *lmm_constraint_id(lmm_constraint_t cnst)
272 void *lmm_variable_id(lmm_variable_t var)
277 static void saturated_constraint_set_update(lmm_system_t sys,
278 lmm_constraint_t cnst,
281 lmm_constraint_t useless_cnst = NULL;
283 XBT_IN3("sys=%p, cnst=%p, min_usage=%f",sys,cnst,*min_usage);
284 if (cnst->usage <= 0) {
288 if (cnst->remaining <= 0) {
292 if ((*min_usage < 0) || (*min_usage > cnst->remaining / cnst->usage)) {
293 *min_usage = cnst->remaining / cnst->usage;
294 LOG3(xbt_log_priority_trace,
295 "min_usage=%f (cnst->remaining=%f, cnst->usage=%f)",*min_usage,
296 cnst->remaining, cnst->usage);
297 while ((useless_cnst =
298 xbt_swag_getFirst(&(sys->saturated_constraint_set))))
299 xbt_swag_remove(useless_cnst, &(sys->saturated_constraint_set));
301 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
302 } else if (*min_usage == cnst->remaining / cnst->usage) {
303 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
308 static void saturated_variable_set_update(lmm_system_t sys)
310 lmm_constraint_t cnst = NULL;
311 xbt_swag_t cnst_list = NULL;
312 lmm_element_t elem = NULL;
313 xbt_swag_t elem_list = NULL;
315 cnst_list = &(sys->saturated_constraint_set);
316 while ((cnst = xbt_swag_getFirst(cnst_list))) {
317 elem_list = &(cnst->active_element_set);
318 xbt_swag_foreach(elem, elem_list) {
319 if(elem->variable->weight<=0) break;
320 if ((elem->value > 0))
321 xbt_swag_insert(elem->variable, &(sys->saturated_variable_set));
323 xbt_swag_remove(cnst, cnst_list);
327 void lmm_print(lmm_system_t sys)
329 lmm_constraint_t cnst = NULL;
330 lmm_element_t elem = NULL;
331 lmm_variable_t var = NULL;
332 xbt_swag_t cnst_list = NULL;
333 xbt_swag_t var_list = NULL;
334 xbt_swag_t elem_list = NULL;
335 char print_buf[1024];
336 char *trace_buf=xbt_malloc0(sizeof(char));
339 /* Printing Objective */
340 var_list = &(sys->variable_set);
341 sprintf(print_buf,"MAX-MIN ( ");
342 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
343 strcat(trace_buf, print_buf);
344 xbt_swag_foreach(var, var_list) {
345 sprintf(print_buf,"'%p'(%f) ",var,var->weight);
346 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
347 strcat(trace_buf, print_buf);
349 sprintf(print_buf,")");
350 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
351 strcat(trace_buf, print_buf);
352 DEBUG1("%s",trace_buf);
355 /* Printing Constraints */
356 cnst_list = &(sys->active_constraint_set);
357 xbt_swag_foreach(cnst, cnst_list) {
359 elem_list = &(cnst->element_set);
360 sprintf(print_buf,"\t");
361 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
362 strcat(trace_buf, print_buf);
363 xbt_swag_foreach(elem, elem_list) {
364 sprintf(print_buf,"%f.'%p'(%f) + ",elem->value,
365 elem->variable,elem->variable->value);
366 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
367 strcat(trace_buf, print_buf);
368 sum += elem->value * elem->variable->value;
370 sprintf(print_buf,"0 <= %f ('%p')",cnst->bound,cnst);
371 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
372 strcat(trace_buf, print_buf);
375 sprintf(print_buf," [MAX-Constraint]");
376 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
377 strcat(trace_buf, print_buf);
379 DEBUG1("%s",trace_buf);
381 xbt_assert2((sum<=cnst->bound), "Incorrect value (%f is not smaller than %f)",
385 /* Printing Result */
386 xbt_swag_foreach(var, var_list) {
388 DEBUG4("'%p'(%f) : %f (<=%f)",var,var->weight,var->value, var->bound);
389 xbt_assert0((var->value<=var->bound), "Incorrect value");
392 DEBUG3("'%p'(%f) : %f",var,var->weight,var->value);
398 void lmm_solve(lmm_system_t sys)
400 lmm_variable_t var = NULL;
401 lmm_constraint_t cnst = NULL;
402 lmm_element_t elem = NULL;
403 xbt_swag_t cnst_list = NULL;
404 xbt_swag_t var_list = NULL;
405 xbt_swag_t elem_list = NULL;
406 double min_usage = -1;
408 if (!(sys->modified))
412 var_list = &(sys->variable_set);
413 DEBUG1("Variable set : %d", xbt_swag_size(var_list));
414 xbt_swag_foreach(var, var_list) {
419 * Compute Usage and store the variables that reach the maximum.
421 cnst_list = &(sys->active_constraint_set);
422 DEBUG1("Active constraints : %d", xbt_swag_size(cnst_list));
423 xbt_swag_foreach(cnst, cnst_list) {
425 cnst->remaining = cnst->bound;
427 elem_list = &(cnst->element_set);
429 xbt_swag_foreach(elem, elem_list) {
430 if(elem->variable->weight <=0) break;
431 if ((elem->value > 0)) {
433 cnst->usage += elem->value / elem->variable->weight;
435 if(cnst->usage<elem->value / elem->variable->weight)
436 cnst->usage = elem->value / elem->variable->weight;
437 DEBUG2("Constraint Usage %p : %f",cnst,cnst->usage);
438 make_elem_active(elem);
441 /* Saturated constraints update */
442 saturated_constraint_set_update(sys, cnst, &min_usage);
444 saturated_variable_set_update(sys);
446 /* Saturated variables update */
449 /* Fix the variables that have to be */
450 var_list = &(sys->saturated_variable_set);
452 xbt_swag_foreach(var, var_list) {
453 /* First check if some of these variables have reach their upper
454 bound and update min_usage accordingly. */
455 DEBUG5("var=%p, var->bound=%f, var->weight=%f, min_usage=%f, var->bound*var->weight=%f",
456 var, var->bound, var->weight, min_usage,var->bound * var->weight);
457 if ((var->bound > 0) && (var->bound * var->weight < min_usage)) {
458 min_usage = var->bound * var->weight;
459 DEBUG1("Updated min_usage=%f",min_usage);
464 while ((var = xbt_swag_getFirst(var_list))) {
467 var->value = min_usage / var->weight;
468 DEBUG5("Min usage: %f, Var(%p)->weight: %f, Var(%p)->value: %f ",min_usage,var,var->weight,var,var->value);
473 for (i = 0; i < var->cnsts_number; i++) {
474 elem = &var->cnsts[i];
475 cnst = elem->constraint;
477 double_update(&(cnst->remaining), elem->value * var->value);
478 double_update(&(cnst->usage), elem->value / var->weight);
479 make_elem_inactive(elem);
480 } else { /* FIXME one day: We recompute usage.... :( */
482 make_elem_inactive(elem);
483 xbt_swag_foreach(elem, elem_list) {
484 if(elem->variable->weight <=0) break;
485 if(elem->variable->value > 0) break;
486 if ((elem->value > 0)) {
487 if(cnst->usage<elem->value / elem->variable->weight)
488 cnst->usage = elem->value / elem->variable->weight;
489 DEBUG2("Constraint Usage %p : %f",cnst,cnst->usage);
490 make_elem_active(elem);
495 xbt_swag_remove(var, var_list);
498 /* Find out which variables reach the maximum */
499 cnst_list = &(sys->active_constraint_set);
501 xbt_swag_foreach(cnst, cnst_list) {
502 saturated_constraint_set_update(sys, cnst, &min_usage);
504 saturated_variable_set_update(sys);
506 } while (xbt_swag_size(&(sys->saturated_variable_set)));
509 if(XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
514 /* Not a O(1) function */
516 void lmm_update(lmm_system_t sys, lmm_constraint_t cnst,
517 lmm_variable_t var, double value)
522 for (i = 0; i < var->cnsts_number; i++)
523 if (var->cnsts[i].constraint == cnst) {
524 var->cnsts[i].value = value;
529 void lmm_update_variable_bound(lmm_system_t sys, lmm_variable_t var,
536 void lmm_update_variable_weight(lmm_system_t sys, lmm_variable_t var,
542 XBT_IN3("(sys=%p, var=%p, weight=%f)",sys,var,weight);
544 var->weight = weight;
545 xbt_swag_remove(var,&(sys->variable_set));
546 if(weight) xbt_swag_insert_at_head(var,&(sys->variable_set));
547 else xbt_swag_insert_at_tail(var,&(sys->variable_set));
549 for (i = 0; i < var->cnsts_number; i++) {
550 elem = &var->cnsts[i];
551 xbt_swag_remove(elem, &(elem->constraint->element_set));
552 if(weight) xbt_swag_insert_at_head(elem, &(elem->constraint->element_set));
553 else xbt_swag_insert_at_tail(elem, &(elem->constraint->element_set));
558 double lmm_get_variable_weight(lmm_variable_t var)
564 void lmm_update_constraint_bound(lmm_system_t sys, lmm_constraint_t cnst,
571 int lmm_constraint_used(lmm_system_t sys, lmm_constraint_t cnst)
573 return xbt_swag_belongs(cnst, &(sys->active_constraint_set));
576 lmm_constraint_t lmm_get_first_active_constraint(lmm_system_t sys)
578 return xbt_swag_getFirst(&(sys->active_constraint_set));
581 lmm_constraint_t lmm_get_next_active_constraint(lmm_system_t sys, lmm_constraint_t cnst)
583 return xbt_swag_getNext(cnst,(sys->active_constraint_set).offset);