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);
89 memset(var->cnsts,0,var->cnsts_size*sizeof(s_lmm_element_t));
91 xbt_mallocator_release(sys->variable_mallocator, var);
94 static void lmm_cnst_free(lmm_system_t sys, lmm_constraint_t cnst)
96 /* xbt_assert0(xbt_swag_size(&(cnst->element_set)), */
97 /* "This list should be empty!"); */
98 remove_active_constraint(sys, cnst);
102 lmm_constraint_t lmm_constraint_new(lmm_system_t sys, void *id,
105 lmm_constraint_t cnst = NULL;
106 s_lmm_element_t elem;
108 cnst = xbt_new0(s_lmm_constraint_t, 1);
110 xbt_swag_init(&(cnst->element_set),
111 xbt_swag_offset(elem, element_set_hookup));
112 xbt_swag_init(&(cnst->active_element_set),
113 xbt_swag_offset(elem, active_element_set_hookup));
115 cnst->bound = bound_value;
118 insert_constraint(sys, cnst);
123 void lmm_constraint_shared(lmm_constraint_t cnst)
128 void lmm_constraint_free(lmm_system_t sys, lmm_constraint_t cnst)
130 remove_constraint(sys, cnst);
131 lmm_cnst_free(sys, cnst);
134 static void* lmm_variable_mallocator_new_f(void) {
135 return xbt_new0(s_lmm_variable_t, 1);
138 static void lmm_variable_mallocator_free_f(void *var) {
142 static void lmm_variable_mallocator_reset_f(void *var) {
143 /* memset to zero like calloc */
144 memset(var, 0, sizeof(s_lmm_variable_t));
147 lmm_variable_t lmm_variable_new(lmm_system_t sys, void *id,
149 double bound, int number_of_constraints)
151 lmm_variable_t var = NULL;
154 XBT_IN5("(sys=%p, id=%p, weight=%f, bound=%f, num_cons =%d)",
155 sys,id,weight,bound,number_of_constraints);
157 var = xbt_mallocator_get(sys->variable_mallocator);
159 var->cnsts = xbt_new0(s_lmm_element_t, number_of_constraints);
160 for(i=0; i<number_of_constraints; i++) {
161 /* Should be useless because of the
162 calloc but it seems to help valgrind... */
163 var->cnsts[i].element_set_hookup.next = NULL;
164 var->cnsts[i].element_set_hookup.prev = NULL;
165 var->cnsts[i].active_element_set_hookup.next = NULL;
166 var->cnsts[i].active_element_set_hookup.prev = NULL;
167 var->cnsts[i].constraint = NULL;
168 var->cnsts[i].variable = NULL;
169 var->cnsts[i].value = 0.0;
171 var->cnsts_size = number_of_constraints;
172 var->cnsts_number = 0; /* Should be useless because of the
173 calloc but it seems to help valgrind... */
174 var->weight = weight;
177 if(weight) xbt_swag_insert_at_head(var,&(sys->variable_set));
178 else xbt_swag_insert_at_tail(var,&(sys->variable_set));
183 void lmm_variable_free(lmm_system_t sys, lmm_variable_t var)
185 remove_variable(sys, var);
186 lmm_var_free(sys, var);
189 double lmm_variable_getvalue(lmm_variable_t var)
194 void lmm_expand(lmm_system_t sys, lmm_constraint_t cnst,
195 lmm_variable_t var, double value)
197 lmm_element_t elem = NULL;
201 xbt_assert0(var->cnsts_number < var->cnsts_size,
202 "Too much constraints");
204 elem = &(var->cnsts[var->cnsts_number++]);
207 elem->constraint = cnst;
208 elem->variable = var;
210 if(var->weight) xbt_swag_insert_at_head(elem,&(elem->constraint->element_set));
211 else xbt_swag_insert_at_tail(elem,&(elem->constraint->element_set));
213 make_constraint_active(sys, cnst);
216 void lmm_expand_add(lmm_system_t sys, lmm_constraint_t cnst,
217 lmm_variable_t var, double value)
222 for(i=0; i< var->cnsts_number ; i++)
223 if(var->cnsts[i].constraint == cnst) break;
225 if(i<var->cnsts_number) var->cnsts[i].value +=value;
226 else lmm_expand(sys,cnst,var,value);
229 void lmm_elem_set_value(lmm_system_t sys, lmm_constraint_t cnst,
230 lmm_variable_t var, double value)
234 for(i=0; i< var->cnsts_number ; i++)
235 if(var->cnsts[i].constraint == cnst) break;
237 if(i<var->cnsts_number) {
238 var->cnsts[i].value =value;
240 } else DIE_IMPOSSIBLE;
243 lmm_constraint_t lmm_get_cnst_from_var(lmm_system_t sys,
244 lmm_variable_t var, int num)
246 if (num < var->cnsts_number)
247 return (var->cnsts[num].constraint);
252 int lmm_get_number_of_cnst_from_var(lmm_system_t sys, lmm_variable_t var)
254 return (var->cnsts_number);
257 lmm_variable_t lmm_get_var_from_cnst(lmm_system_t sys,
258 lmm_constraint_t cnst,
259 lmm_variable_t * var)
262 xbt_swag_getFirst(&(cnst->element_set));
264 *var = xbt_swag_getNext(*var, cnst->element_set.offset);
268 void *lmm_constraint_id(lmm_constraint_t cnst)
273 void *lmm_variable_id(lmm_variable_t var)
278 static void saturated_constraint_set_update(lmm_system_t sys,
279 lmm_constraint_t cnst,
282 lmm_constraint_t useless_cnst = NULL;
284 XBT_IN3("sys=%p, cnst=%p, min_usage=%f",sys,cnst,*min_usage);
285 if (cnst->usage <= 0) {
289 if (cnst->remaining <= 0) {
293 if ((*min_usage < 0) || (*min_usage > cnst->remaining / cnst->usage)) {
294 *min_usage = cnst->remaining / cnst->usage;
295 LOG3(xbt_log_priority_trace,
296 "min_usage=%f (cnst->remaining=%f, cnst->usage=%f)",*min_usage,
297 cnst->remaining, cnst->usage);
298 while ((useless_cnst =
299 xbt_swag_getFirst(&(sys->saturated_constraint_set))))
300 xbt_swag_remove(useless_cnst, &(sys->saturated_constraint_set));
302 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
303 } else if (*min_usage == cnst->remaining / cnst->usage) {
304 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
309 static void saturated_variable_set_update(lmm_system_t sys)
311 lmm_constraint_t cnst = NULL;
312 xbt_swag_t cnst_list = NULL;
313 lmm_element_t elem = NULL;
314 xbt_swag_t elem_list = NULL;
316 cnst_list = &(sys->saturated_constraint_set);
317 while ((cnst = xbt_swag_getFirst(cnst_list))) {
318 elem_list = &(cnst->active_element_set);
319 xbt_swag_foreach(elem, elem_list) {
320 if(elem->variable->weight<=0) break;
321 if ((elem->value > 0))
322 xbt_swag_insert(elem->variable, &(sys->saturated_variable_set));
324 xbt_swag_remove(cnst, cnst_list);
328 static void lmm_print(lmm_system_t sys)
330 lmm_constraint_t cnst = NULL;
331 lmm_element_t elem = NULL;
332 lmm_variable_t var = NULL;
333 xbt_swag_t cnst_list = NULL;
334 xbt_swag_t var_list = NULL;
335 xbt_swag_t elem_list = NULL;
336 char print_buf[1024];
337 char *trace_buf=xbt_malloc0(sizeof(char));
340 /* Printing Objective */
341 var_list = &(sys->variable_set);
342 sprintf(print_buf,"MAX-MIN ( ");
343 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
344 strcat(trace_buf, print_buf);
345 xbt_swag_foreach(var, var_list) {
346 sprintf(print_buf,"'%p'(%f) ",var,var->weight);
347 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
348 strcat(trace_buf, print_buf);
350 sprintf(print_buf,")");
351 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
352 strcat(trace_buf, print_buf);
353 DEBUG1("%s",trace_buf);
356 /* Printing Constraints */
357 cnst_list = &(sys->active_constraint_set);
358 xbt_swag_foreach(cnst, cnst_list) {
360 elem_list = &(cnst->element_set);
361 sprintf(print_buf,"\t");
362 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
363 strcat(trace_buf, print_buf);
364 xbt_swag_foreach(elem, elem_list) {
365 sprintf(print_buf,"%f.'%p'(%f) + ",elem->value,
366 elem->variable,elem->variable->weight);
367 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
368 strcat(trace_buf, print_buf);
369 sum += elem->value * elem->variable->value;
371 sprintf(print_buf,"0 <= %f ('%p')",cnst->bound,cnst);
372 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
373 strcat(trace_buf, print_buf);
374 DEBUG1("%s",trace_buf);
376 xbt_assert2((sum<=cnst->bound), "Incorrect value (%f is not smaller than %f)",
380 /* Printing Result */
381 xbt_swag_foreach(var, var_list) {
383 DEBUG4("'%p'(%f) : %f (<=%f)",var,var->weight,var->value, var->bound);
384 xbt_assert0((var->value<=var->bound), "Incorrect value");
387 DEBUG3("'%p'(%f) : %f",var,var->weight,var->value);
393 void lmm_solve(lmm_system_t sys)
395 lmm_variable_t var = NULL;
396 lmm_constraint_t cnst = NULL;
397 lmm_element_t elem = NULL;
398 xbt_swag_t cnst_list = NULL;
399 xbt_swag_t var_list = NULL;
400 xbt_swag_t elem_list = NULL;
401 double min_usage = -1;
403 if (!(sys->modified))
407 var_list = &(sys->variable_set);
408 DEBUG1("Variable set : %d", xbt_swag_size(var_list));
409 xbt_swag_foreach(var, var_list) {
414 /* Compute Usage and store the variables that reach the maximum */
416 cnst_list = &(sys->active_constraint_set);
417 DEBUG1("Active constraints : %d", xbt_swag_size(cnst_list));
418 xbt_swag_foreach(cnst, cnst_list) {
420 cnst->remaining = cnst->bound;
422 elem_list = &(cnst->element_set);
423 xbt_swag_foreach(elem, elem_list) {
424 if(elem->variable->weight <=0) break;
425 if ((elem->value > 0)) {
427 cnst->usage += elem->value / elem->variable->weight;
430 make_elem_active(elem);
434 /* Saturated constraints update */
435 saturated_constraint_set_update(sys, cnst, &min_usage);
438 saturated_variable_set_update(sys);
440 /* Saturated variables update */
443 /* Fix the variables that have to be */
444 var_list = &(sys->saturated_variable_set);
446 xbt_swag_foreach(var, var_list) {
447 /* First check if some of these variables have reach their upper
448 bound and update min_usage accordingly. */
449 DEBUG5("var=%p, var->bound=%f, var->weight=%f, min_usage=%f, var->bound*var->weight=%f",
450 var, var->bound, var->weight, min_usage,var->bound * var->weight);
451 if ((var->bound > 0) && (var->bound * var->weight < min_usage)) {
452 min_usage = var->bound * var->weight;
453 DEBUG1("Updated min_usage=%f",min_usage);
458 while ((var = xbt_swag_getFirst(var_list))) {
461 var->value = min_usage / var->weight;
465 for (i = 0; i < var->cnsts_number; i++) {
466 elem = &var->cnsts[i];
467 cnst = elem->constraint;
469 cnst->remaining -= elem->value * var->value;
470 cnst->usage -= elem->value / var->weight;
472 make_elem_inactive(elem);
474 xbt_swag_remove(var, var_list);
477 /* Find out which variables reach the maximum */
478 cnst_list = &(sys->active_constraint_set);
480 xbt_swag_foreach(cnst, cnst_list) {
481 saturated_constraint_set_update(sys, cnst, &min_usage);
483 saturated_variable_set_update(sys);
485 } while (xbt_swag_size(&(sys->saturated_variable_set)));
488 if(XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
493 /* Not a O(1) function */
495 void lmm_update(lmm_system_t sys, lmm_constraint_t cnst,
496 lmm_variable_t var, double value)
501 for (i = 0; i < var->cnsts_number; i++)
502 if (var->cnsts[i].constraint == cnst) {
503 var->cnsts[i].value = value;
508 void lmm_update_variable_bound(lmm_system_t sys, lmm_variable_t var,
515 void lmm_update_variable_weight(lmm_system_t sys, lmm_variable_t var,
521 XBT_IN3("(sys=%p, var=%p, weight=%f)",sys,var,weight);
523 var->weight = weight;
524 xbt_swag_remove(var,&(sys->variable_set));
525 if(weight) xbt_swag_insert_at_head(var,&(sys->variable_set));
526 else xbt_swag_insert_at_tail(var,&(sys->variable_set));
528 for (i = 0; i < var->cnsts_number; i++) {
529 elem = &var->cnsts[i];
530 xbt_swag_remove(elem, &(elem->constraint->element_set));
531 if(weight) xbt_swag_insert_at_head(elem, &(elem->constraint->element_set));
532 else xbt_swag_insert_at_tail(elem, &(elem->constraint->element_set));
537 double lmm_get_variable_weight(lmm_variable_t var)
543 void lmm_update_constraint_bound(lmm_system_t sys, lmm_constraint_t cnst,
550 int lmm_constraint_used(lmm_system_t sys, lmm_constraint_t cnst)
552 return xbt_swag_belongs(cnst, &(sys->active_constraint_set));
555 lmm_constraint_t lmm_get_first_active_constraint(lmm_system_t sys)
557 return xbt_swag_getFirst(&(sys->active_constraint_set));
560 lmm_constraint_t lmm_get_next_active_constraint(lmm_system_t sys, lmm_constraint_t cnst)
562 return xbt_swag_getNext(cnst,(sys->active_constraint_set).offset);