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 "maxmin_private.h"
13 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(maxmin, surf,
14 "Logging specific to the SURF maxmin module");
16 lmm_system_t lmm_system_new(void)
18 lmm_system_t l = NULL;
20 s_lmm_constraint_t cnst;
22 l = xbt_new0(s_lmm_system_t, 1);
25 xbt_swag_init(&(l->variable_set),
26 xbt_swag_offset(var, variable_set_hookup));
27 xbt_swag_init(&(l->constraint_set),
28 xbt_swag_offset(cnst, constraint_set_hookup));
30 xbt_swag_init(&(l->active_constraint_set),
31 xbt_swag_offset(cnst, active_constraint_set_hookup));
33 xbt_swag_init(&(l->saturated_variable_set),
34 xbt_swag_offset(var, saturated_variable_set_hookup));
35 xbt_swag_init(&(l->saturated_constraint_set),
36 xbt_swag_offset(cnst, saturated_constraint_set_hookup));
41 void lmm_system_free(lmm_system_t sys)
43 lmm_variable_t var = NULL;
44 lmm_constraint_t cnst = NULL;
46 while ((var = extract_variable(sys)))
47 lmm_var_free(sys, var);
49 while ((cnst = extract_constraint(sys)))
50 lmm_cnst_free(sys, cnst);
55 void lmm_variable_disable(lmm_system_t sys, lmm_variable_t var)
58 lmm_element_t elem = NULL;
62 for (i = 0; i < var->cnsts_number; i++) {
63 elem = &var->cnsts[i];
64 xbt_swag_remove(elem, &(elem->constraint->element_set));
65 xbt_swag_remove(elem, &(elem->constraint->active_element_set));
66 if (!xbt_swag_size(&(elem->constraint->element_set)))
67 make_constraint_inactive(sys, elem->constraint);
69 var->cnsts_number = 0;
72 static void lmm_var_free(lmm_system_t sys, lmm_variable_t var)
75 lmm_variable_disable(sys, var);
76 memset(var->cnsts,0,var->cnsts_size*sizeof(s_lmm_element_t));
81 static void lmm_cnst_free(lmm_system_t sys, lmm_constraint_t cnst)
83 /* xbt_assert0(xbt_swag_size(&(cnst->element_set)), */
84 /* "This list should be empty!"); */
85 remove_active_constraint(sys, cnst);
89 lmm_constraint_t lmm_constraint_new(lmm_system_t sys, void *id,
92 lmm_constraint_t cnst = NULL;
95 cnst = xbt_new0(s_lmm_constraint_t, 1);
97 xbt_swag_init(&(cnst->element_set),
98 xbt_swag_offset(elem, element_set_hookup));
99 xbt_swag_init(&(cnst->active_element_set),
100 xbt_swag_offset(elem, active_element_set_hookup));
102 cnst->bound = bound_value;
105 insert_constraint(sys, cnst);
110 void lmm_constraint_shared(lmm_constraint_t cnst)
115 void lmm_constraint_free(lmm_system_t sys, lmm_constraint_t cnst)
117 remove_constraint(sys, cnst);
118 lmm_cnst_free(sys, cnst);
121 lmm_variable_t lmm_variable_new(lmm_system_t sys, void *id,
123 double bound, int number_of_constraints)
125 lmm_variable_t var = NULL;
127 var = xbt_new0(s_lmm_variable_t, 1);
129 var->cnsts = xbt_new0(s_lmm_element_t, number_of_constraints);
130 for(i=0; i<number_of_constraints; i++) {
131 /* Should be useless because of the
132 calloc but it seems to help valgrind... */
133 var->cnsts[i].element_set_hookup.next = NULL;
134 var->cnsts[i].element_set_hookup.prev = NULL;
135 var->cnsts[i].active_element_set_hookup.next = NULL;
136 var->cnsts[i].active_element_set_hookup.prev = NULL;
137 var->cnsts[i].constraint = NULL;
138 var->cnsts[i].variable = NULL;
139 var->cnsts[i].value = 0.0;
141 var->cnsts_size = number_of_constraints;
142 var->cnsts_number = 0; /* Should be useless because of the
143 calloc but it seems to help valgrind... */
144 var->weight = weight;
147 if(weight) xbt_swag_insert_at_head(var,&(sys->variable_set));
148 else xbt_swag_insert_at_tail(var,&(sys->variable_set));
153 void lmm_variable_free(lmm_system_t sys, lmm_variable_t var)
155 remove_variable(sys, var);
156 lmm_var_free(sys, var);
159 double lmm_variable_getvalue(lmm_variable_t var)
164 void lmm_expand(lmm_system_t sys, lmm_constraint_t cnst,
165 lmm_variable_t var, double value)
167 lmm_element_t elem = NULL;
171 xbt_assert0(var->cnsts_number < var->cnsts_size,
172 "Too much constraints");
174 elem = &(var->cnsts[var->cnsts_number++]);
177 elem->constraint = cnst;
178 elem->variable = var;
180 if(var->weight) xbt_swag_insert_at_head(elem,&(elem->constraint->element_set));
181 else xbt_swag_insert_at_tail(elem,&(elem->constraint->element_set));
183 make_constraint_active(sys, cnst);
186 void lmm_expand_add(lmm_system_t sys, lmm_constraint_t cnst,
187 lmm_variable_t var, double value)
192 for(i=0; i< var->cnsts_number ; i++)
193 if(var->cnsts[i].constraint == cnst) break;
195 if(i<var->cnsts_number) var->cnsts[i].value +=value;
196 else lmm_expand(sys,cnst,var,value);
199 lmm_constraint_t lmm_get_cnst_from_var(lmm_system_t sys,
200 lmm_variable_t var, int num)
202 if (num < var->cnsts_number)
203 return (var->cnsts[num].constraint);
208 int lmm_get_number_of_cnst_from_var(lmm_system_t sys, lmm_variable_t var)
210 return (var->cnsts_number);
213 lmm_variable_t lmm_get_var_from_cnst(lmm_system_t sys,
214 lmm_constraint_t cnst,
215 lmm_variable_t * var)
218 xbt_swag_getFirst(&(cnst->element_set));
220 *var = xbt_swag_getNext(*var, cnst->element_set.offset);
224 void *lmm_constraint_id(lmm_constraint_t cnst)
229 void *lmm_variable_id(lmm_variable_t var)
234 static void saturated_constraint_set_update(lmm_system_t sys,
235 lmm_constraint_t cnst,
238 lmm_constraint_t useless_cnst = NULL;
240 if (cnst->usage <= 0)
242 if (cnst->remaining <= 0)
244 if ((*min_usage < 0) || (*min_usage > cnst->remaining / cnst->usage)) {
245 *min_usage = cnst->remaining / cnst->usage;
247 while ((useless_cnst =
248 xbt_swag_getFirst(&(sys->saturated_constraint_set))))
249 xbt_swag_remove(useless_cnst, &(sys->saturated_constraint_set));
251 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
252 } else if (*min_usage == cnst->remaining / cnst->usage) {
253 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
257 static void saturated_variable_set_update(lmm_system_t sys)
259 lmm_constraint_t cnst = NULL;
260 xbt_swag_t cnst_list = NULL;
261 lmm_element_t elem = NULL;
262 xbt_swag_t elem_list = NULL;
264 cnst_list = &(sys->saturated_constraint_set);
265 while ((cnst = xbt_swag_getFirst(cnst_list))) {
266 elem_list = &(cnst->active_element_set);
267 xbt_swag_foreach(elem, elem_list) {
268 if(elem->variable->weight<=0) break;
269 if ((elem->value > 0))
270 xbt_swag_insert(elem->variable, &(sys->saturated_variable_set));
272 xbt_swag_remove(cnst, cnst_list);
277 void lmm_solve(lmm_system_t sys)
279 lmm_variable_t var = NULL;
280 lmm_constraint_t cnst = NULL;
281 lmm_element_t elem = NULL;
282 xbt_swag_t cnst_list = NULL;
283 xbt_swag_t var_list = NULL;
284 xbt_swag_t elem_list = NULL;
285 double min_usage = -1;
287 if (!(sys->modified))
291 var_list = &(sys->variable_set);
292 DEBUG1("Variable set : %d", xbt_swag_size(var_list));
293 xbt_swag_foreach(var, var_list) {
298 /* Compute Usage and store the variables that reach the maximum */
300 cnst_list = &(sys->active_constraint_set);
301 DEBUG1("cnst_list : %d", xbt_swag_size(cnst_list));
302 xbt_swag_foreach(cnst, cnst_list) {
304 cnst->remaining = cnst->bound;
306 elem_list = &(cnst->element_set);
307 xbt_swag_foreach(elem, elem_list) {
308 if(elem->variable->weight <=0) break;
309 if ((elem->value > 0)) {
311 cnst->usage += elem->value / elem->variable->weight;
314 make_elem_active(elem);
318 /* Saturated constraints update */
319 saturated_constraint_set_update(sys, cnst, &min_usage);
322 saturated_variable_set_update(sys);
324 /* Saturated variables update */
327 /* Fix the variables that have to be */
328 var_list = &(sys->saturated_variable_set);
330 xbt_swag_foreach(var, var_list) {
331 /* First check if some of these variables have reach their upper
332 bound and update min_usage accordingly. */
333 if ((var->bound > 0) && (var->bound / var->weight < min_usage)) {
334 min_usage = var->bound / var->weight;
339 while ((var = xbt_swag_getFirst(var_list))) {
342 var->value = min_usage / var->weight;
346 for (i = 0; i < var->cnsts_number; i++) {
347 elem = &var->cnsts[i];
348 cnst = elem->constraint;
350 cnst->remaining -= elem->value * var->value;
351 cnst->usage -= elem->value / var->weight;
353 make_elem_inactive(elem);
355 xbt_swag_remove(var, var_list);
358 /* Find out which variables reach the maximum */
359 cnst_list = &(sys->active_constraint_set);
361 xbt_swag_foreach(cnst, cnst_list) {
362 saturated_constraint_set_update(sys, cnst, &min_usage);
364 saturated_variable_set_update(sys);
366 } while (xbt_swag_size(&(sys->saturated_variable_set)));
371 /* Not a O(1) function */
373 void lmm_update(lmm_system_t sys, lmm_constraint_t cnst,
374 lmm_variable_t var, double value)
379 for (i = 0; i < var->cnsts_number; i++)
380 if (var->cnsts[i].constraint == cnst) {
381 var->cnsts[i].value = value;
386 void lmm_update_variable_bound(lmm_system_t sys, lmm_variable_t var,
393 void lmm_update_variable_weight(lmm_system_t sys, lmm_variable_t var,
400 var->weight = weight;
401 xbt_swag_remove(var,&(sys->variable_set));
402 if(weight) xbt_swag_insert_at_head(var,&(sys->variable_set));
403 else xbt_swag_insert_at_tail(var,&(sys->variable_set));
405 for (i = 0; i < var->cnsts_number; i++) {
406 elem = &var->cnsts[i];
407 xbt_swag_remove(elem, &(elem->constraint->element_set));
408 if(weight) xbt_swag_insert_at_head(elem, &(elem->constraint->element_set));
409 else xbt_swag_insert_at_tail(elem, &(elem->constraint->element_set));
413 double lmm_get_variable_weight(lmm_variable_t var)
419 void lmm_update_constraint_bound(lmm_system_t sys, lmm_constraint_t cnst,
426 int lmm_constraint_used(lmm_system_t sys, lmm_constraint_t cnst)
428 return xbt_swag_belongs(cnst, &(sys->active_constraint_set));
431 lmm_constraint_t lmm_get_first_active_constraint(lmm_system_t sys)
433 return xbt_swag_getFirst(&(sys->active_constraint_set));
436 lmm_constraint_t lmm_get_next_active_constraint(lmm_system_t sys, lmm_constraint_t cnst)
438 return xbt_swag_getNext(cnst,(sys->active_constraint_set).offset);
442 /* void lmm_print(lmm_system_t sys) */
444 /* lmm_variable_t var = NULL; */
445 /* lmm_constraint_t cnst = NULL; */
446 /* lmm_element_t elem = NULL; */
447 /* xbt_swag_t cnst_list = NULL; */
448 /* xbt_swag_t var_list = NULL; */
449 /* xbt_swag_t elem_list = NULL; */
451 /* var_list = &(sys->variable_set); */
452 /* xbt_swag_foreach(var, var_list) { */
453 /* printf("%s : {\n",var->id); */
454 /* printf("\t %s : {\n",var->id); */