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"
10 #include "xbt/error.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;
104 insert_constraint(sys, cnst);
109 void lmm_constraint_free(lmm_system_t sys, lmm_constraint_t cnst)
111 remove_constraint(sys, cnst);
112 lmm_cnst_free(sys, cnst);
115 lmm_variable_t lmm_variable_new(lmm_system_t sys, void *id,
117 double bound, int number_of_constraints)
119 lmm_variable_t var = NULL;
121 var = xbt_new0(s_lmm_variable_t, 1);
123 var->cnsts = xbt_new0(s_lmm_element_t, number_of_constraints);
124 for(i=0; i<number_of_constraints; i++) {
125 /* Should be useless because of the
126 calloc but it seems to help valgrind... */
127 var->cnsts[i].element_set_hookup.next = NULL;
128 var->cnsts[i].element_set_hookup.prev = NULL;
129 var->cnsts[i].active_element_set_hookup.next = NULL;
130 var->cnsts[i].active_element_set_hookup.prev = NULL;
131 var->cnsts[i].constraint = NULL;
132 var->cnsts[i].variable = NULL;
133 var->cnsts[i].value = 0.0;
135 var->cnsts_size = number_of_constraints;
136 var->cnsts_number = 0; /* Should be useless because of the
137 calloc but it seems to help valgrind... */
138 var->weight = weight;
141 if(weight) xbt_swag_insert_at_head(var,&(sys->variable_set));
142 else xbt_swag_insert_at_tail(var,&(sys->variable_set));
147 void lmm_variable_free(lmm_system_t sys, lmm_variable_t var)
149 remove_variable(sys, var);
150 lmm_var_free(sys, var);
153 double lmm_variable_getvalue(lmm_variable_t var)
158 void lmm_expand(lmm_system_t sys, lmm_constraint_t cnst,
159 lmm_variable_t var, double value)
161 lmm_element_t elem = NULL;
165 xbt_assert0(var->cnsts_number < var->cnsts_size,
166 "Too much constraints");
168 elem = &(var->cnsts[var->cnsts_number++]);
171 elem->constraint = cnst;
172 elem->variable = var;
174 if(var->weight) xbt_swag_insert_at_head(elem,&(elem->constraint->element_set));
175 else xbt_swag_insert_at_tail(elem,&(elem->constraint->element_set));
177 make_constraint_active(sys, cnst);
180 void lmm_expand_add(lmm_system_t sys, lmm_constraint_t cnst,
181 lmm_variable_t var, double value)
186 for(i=0; i< var->cnsts_number ; i++)
187 if(var->cnsts[i].constraint == cnst) break;
189 if(i<var->cnsts_number) var->cnsts[i].value +=value;
190 else lmm_expand(sys,cnst,var,value);
193 lmm_constraint_t lmm_get_cnst_from_var(lmm_system_t sys,
194 lmm_variable_t var, int num)
196 if (num < var->cnsts_number)
197 return (var->cnsts[num].constraint);
202 int lmm_get_number_of_cnst_from_var(lmm_system_t sys, lmm_variable_t var)
204 return (var->cnsts_number);
207 lmm_variable_t lmm_get_var_from_cnst(lmm_system_t sys,
208 lmm_constraint_t cnst,
209 lmm_variable_t * var)
212 xbt_swag_getFirst(&(cnst->element_set));
214 *var = xbt_swag_getNext(*var, cnst->element_set.offset);
218 void *lmm_constraint_id(lmm_constraint_t cnst)
223 void *lmm_variable_id(lmm_variable_t var)
228 static void saturated_constraint_set_update(lmm_system_t sys,
229 lmm_constraint_t cnst,
232 lmm_constraint_t useless_cnst = NULL;
234 if (cnst->usage <= 0)
236 if (cnst->remaining <= 0)
238 if ((*min_usage < 0) || (*min_usage > cnst->remaining / cnst->usage)) {
239 *min_usage = cnst->remaining / cnst->usage;
241 while ((useless_cnst =
242 xbt_swag_getFirst(&(sys->saturated_constraint_set))))
243 xbt_swag_remove(useless_cnst, &(sys->saturated_constraint_set));
245 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
246 } else if (*min_usage == cnst->remaining / cnst->usage) {
247 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
251 static void saturated_variable_set_update(lmm_system_t sys)
253 lmm_constraint_t cnst = NULL;
254 xbt_swag_t cnst_list = NULL;
255 lmm_element_t elem = NULL;
256 xbt_swag_t elem_list = NULL;
258 cnst_list = &(sys->saturated_constraint_set);
259 while ((cnst = xbt_swag_getFirst(cnst_list))) {
260 elem_list = &(cnst->active_element_set);
261 xbt_swag_foreach(elem, elem_list) {
262 if(elem->variable->weight<=0) break;
263 if ((elem->value > 0))
264 xbt_swag_insert(elem->variable, &(sys->saturated_variable_set));
266 xbt_swag_remove(cnst, cnst_list);
271 void lmm_solve(lmm_system_t sys)
273 lmm_variable_t var = NULL;
274 lmm_constraint_t cnst = NULL;
275 lmm_element_t elem = NULL;
276 xbt_swag_t cnst_list = NULL;
277 xbt_swag_t var_list = NULL;
278 xbt_swag_t elem_list = NULL;
279 double min_usage = -1;
281 if (!(sys->modified))
285 var_list = &(sys->variable_set);
286 DEBUG1("Variable set : %d", xbt_swag_size(var_list));
287 xbt_swag_foreach(var, var_list) {
292 /* Compute Usage and store the variables that reach the maximum */
294 cnst_list = &(sys->active_constraint_set);
295 DEBUG1("cnst_list : %d", xbt_swag_size(cnst_list));
296 xbt_swag_foreach(cnst, cnst_list) {
298 cnst->remaining = cnst->bound;
300 elem_list = &(cnst->element_set);
301 xbt_swag_foreach(elem, elem_list) {
302 if(elem->variable->weight <=0) break;
303 if ((elem->value > 0)) {
304 cnst->usage += elem->value / elem->variable->weight;
305 make_elem_active(elem);
309 /* Saturated constraints update */
310 saturated_constraint_set_update(sys, cnst, &min_usage);
313 saturated_variable_set_update(sys);
315 /* Saturated variables update */
318 /* Fix the variables that have to be */
319 var_list = &(sys->saturated_variable_set);
321 xbt_swag_foreach(var, var_list) {
322 /* First check if some of these variables have reach their upper
323 bound and update min_usage accordingly. */
324 if ((var->bound > 0) && (var->bound / var->weight < min_usage)) {
325 min_usage = var->bound / var->weight;
330 while ((var = xbt_swag_getFirst(var_list))) {
333 var->value = min_usage / var->weight;
337 for (i = 0; i < var->cnsts_number; i++) {
338 elem = &var->cnsts[i];
339 cnst = elem->constraint;
340 cnst->remaining -= elem->value * var->value;
341 cnst->usage -= elem->value / var->weight;
342 make_elem_inactive(elem);
344 xbt_swag_remove(var, var_list);
347 /* Find out which variables reach the maximum */
348 cnst_list = &(sys->active_constraint_set);
350 xbt_swag_foreach(cnst, cnst_list) {
351 saturated_constraint_set_update(sys, cnst, &min_usage);
353 saturated_variable_set_update(sys);
355 } while (xbt_swag_size(&(sys->saturated_variable_set)));
360 /* Not a O(1) function */
362 void lmm_update(lmm_system_t sys, lmm_constraint_t cnst,
363 lmm_variable_t var, double value)
368 for (i = 0; i < var->cnsts_number; i++)
369 if (var->cnsts[i].constraint == cnst) {
370 var->cnsts[i].value = value;
375 void lmm_update_variable_bound(lmm_system_t sys, lmm_variable_t var,
382 void lmm_update_variable_weight(lmm_system_t sys, lmm_variable_t var,
389 var->weight = weight;
390 xbt_swag_remove(var,&(sys->variable_set));
391 if(weight) xbt_swag_insert_at_head(var,&(sys->variable_set));
392 else xbt_swag_insert_at_tail(var,&(sys->variable_set));
394 for (i = 0; i < var->cnsts_number; i++) {
395 elem = &var->cnsts[i];
396 xbt_swag_remove(elem, &(elem->constraint->element_set));
397 if(weight) xbt_swag_insert_at_head(elem, &(elem->constraint->element_set));
398 else xbt_swag_insert_at_tail(elem, &(elem->constraint->element_set));
402 double lmm_get_variable_weight(lmm_variable_t var)
408 void lmm_update_constraint_bound(lmm_system_t sys, lmm_constraint_t cnst,
415 int lmm_constraint_used(lmm_system_t sys, lmm_constraint_t cnst)
417 return xbt_swag_belongs(cnst, &(sys->active_constraint_set));
420 lmm_constraint_t lmm_get_first_active_constraint(lmm_system_t sys)
422 return xbt_swag_getFirst(&(sys->active_constraint_set));
425 lmm_constraint_t lmm_get_next_active_constraint(lmm_system_t sys, lmm_constraint_t cnst)
427 return xbt_swag_getNext(cnst,(sys->active_constraint_set).offset);
431 /* void lmm_print(lmm_system_t sys) */
433 /* lmm_variable_t var = NULL; */
434 /* lmm_constraint_t cnst = NULL; */
435 /* lmm_element_t elem = NULL; */
436 /* xbt_swag_t cnst_list = NULL; */
437 /* xbt_swag_t var_list = NULL; */
438 /* xbt_swag_t elem_list = NULL; */
440 /* var_list = &(sys->variable_set); */
441 /* xbt_swag_foreach(var, var_list) { */
442 /* printf("%s : {\n",var->id); */
443 /* printf("\t %s : {\n",var->id); */