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 var->cnsts_size = number_of_constraints;
125 /* var->cnsts_number = 0; *//* Useless because of the calloc */
126 var->weight = weight;
129 if(weight) xbt_swag_insert_at_head(var,&(sys->variable_set));
130 else xbt_swag_insert_at_tail(var,&(sys->variable_set));
135 void lmm_variable_free(lmm_system_t sys, lmm_variable_t var)
137 remove_variable(sys, var);
138 lmm_var_free(sys, var);
141 double lmm_variable_getvalue(lmm_variable_t var)
146 void lmm_expand(lmm_system_t sys, lmm_constraint_t cnst,
147 lmm_variable_t var, double value)
149 lmm_element_t elem = NULL;
153 xbt_assert0(var->cnsts_number < var->cnsts_size,
154 "Too much constraints");
156 elem = &(var->cnsts[var->cnsts_number++]);
159 elem->constraint = cnst;
160 elem->variable = var;
162 if(var->weight) xbt_swag_insert_at_head(elem,&(elem->constraint->element_set));
163 else xbt_swag_insert_at_tail(elem,&(elem->constraint->element_set));
165 make_constraint_active(sys, cnst);
168 lmm_constraint_t lmm_get_cnst_from_var(lmm_system_t sys,
169 lmm_variable_t var, int num)
171 if (num < var->cnsts_number)
172 return (var->cnsts[num].constraint);
177 int lmm_get_number_of_cnst_from_var(lmm_system_t sys, lmm_variable_t var)
179 return (var->cnsts_number);
182 lmm_variable_t lmm_get_var_from_cnst(lmm_system_t sys,
183 lmm_constraint_t cnst,
184 lmm_variable_t * var)
187 xbt_swag_getFirst(&(cnst->element_set));
189 *var = xbt_swag_getNext(*var, cnst->element_set.offset);
193 void *lmm_constraint_id(lmm_constraint_t cnst)
198 void *lmm_variable_id(lmm_variable_t var)
203 static void saturated_constraint_set_update(lmm_system_t sys,
204 lmm_constraint_t cnst,
207 lmm_constraint_t useless_cnst = NULL;
209 if (cnst->usage <= 0)
211 if (cnst->remaining <= 0)
213 if ((*min_usage < 0) || (*min_usage > cnst->remaining / cnst->usage)) {
214 *min_usage = cnst->remaining / cnst->usage;
216 while ((useless_cnst =
217 xbt_swag_getFirst(&(sys->saturated_constraint_set))))
218 xbt_swag_remove(useless_cnst, &(sys->saturated_constraint_set));
220 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
221 } else if (*min_usage == cnst->remaining / cnst->usage) {
222 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
226 static void saturated_variable_set_update(lmm_system_t sys)
228 lmm_constraint_t cnst = NULL;
229 xbt_swag_t cnst_list = NULL;
230 lmm_element_t elem = NULL;
231 xbt_swag_t elem_list = NULL;
233 cnst_list = &(sys->saturated_constraint_set);
234 while ((cnst = xbt_swag_getFirst(cnst_list))) {
235 elem_list = &(cnst->active_element_set);
236 xbt_swag_foreach(elem, elem_list) {
237 if(elem->variable->weight<=0) break;
238 if ((elem->value > 0))
239 xbt_swag_insert(elem->variable, &(sys->saturated_variable_set));
241 xbt_swag_remove(cnst, cnst_list);
246 void lmm_solve(lmm_system_t sys)
248 lmm_variable_t var = NULL;
249 lmm_constraint_t cnst = NULL;
250 lmm_element_t elem = NULL;
251 xbt_swag_t cnst_list = NULL;
252 xbt_swag_t var_list = NULL;
253 xbt_swag_t elem_list = NULL;
254 double min_usage = -1;
256 if (!(sys->modified))
260 var_list = &(sys->variable_set);
261 xbt_swag_foreach(var, var_list) {
266 /* Compute Usage and store the variables that reach the maximum */
268 cnst_list = &(sys->active_constraint_set);
269 xbt_swag_foreach(cnst, cnst_list) {
271 elem_list = &(cnst->element_set);
272 cnst->remaining = cnst->bound;
274 xbt_swag_foreach(elem, elem_list) {
275 if(elem->variable->weight <=0) break;
276 if ((elem->value > 0)) {
277 cnst->usage += elem->value / elem->variable->weight;
278 make_elem_active(elem);
282 /* Saturated constraints update */
283 saturated_constraint_set_update(sys, cnst, &min_usage);
286 saturated_variable_set_update(sys);
288 /* Saturated variables update */
291 /* Fix the variables that have to be */
292 var_list = &(sys->saturated_variable_set);
295 xbt_swag_foreach(var, var_list) {
296 /* First check if some of these variables have reach their upper
297 bound and update min_usage accordingly. */
298 if ((var->bound > 0) && (var->bound / var->weight < min_usage)) {
299 min_usage = var->bound / var->weight;
304 while ((var = xbt_swag_getFirst(var_list))) {
307 var->value = min_usage / var->weight;
311 for (i = 0; i < var->cnsts_number; i++) {
312 elem = &var->cnsts[i];
313 cnst = elem->constraint;
314 cnst->remaining -= elem->value * var->value;
315 cnst->usage -= elem->value / var->weight;
316 make_elem_inactive(elem);
318 xbt_swag_remove(var, var_list);
321 /* Find out which variables reach the maximum */
322 cnst_list = &(sys->active_constraint_set);
324 xbt_swag_foreach(cnst, cnst_list) {
325 saturated_constraint_set_update(sys, cnst, &min_usage);
327 saturated_variable_set_update(sys);
329 } while (xbt_swag_size(&(sys->saturated_variable_set)));
334 /* Not a O(1) function */
336 void lmm_update(lmm_system_t sys, lmm_constraint_t cnst,
337 lmm_variable_t var, double value)
342 for (i = 0; i < var->cnsts_number; i++)
343 if (var->cnsts[i].constraint == cnst) {
344 var->cnsts[i].value = value;
349 void lmm_update_variable_bound(lmm_system_t sys, lmm_variable_t var,
356 void lmm_update_variable_weight(lmm_system_t sys, lmm_variable_t var,
363 var->weight = weight;
364 xbt_swag_remove(var,&(sys->variable_set));
365 if(weight) xbt_swag_insert_at_head(var,&(sys->variable_set));
366 else xbt_swag_insert_at_tail(var,&(sys->variable_set));
368 for (i = 0; i < var->cnsts_number; i++) {
369 elem = &var->cnsts[i];
370 xbt_swag_remove(elem, &(elem->constraint->element_set));
371 if(weight) xbt_swag_insert_at_head(elem, &(elem->constraint->element_set));
372 else xbt_swag_insert_at_tail(elem, &(elem->constraint->element_set));
376 double lmm_get_variable_weight(lmm_variable_t var)
382 void lmm_update_constraint_bound(lmm_system_t sys, lmm_constraint_t cnst,
389 int lmm_constraint_used(lmm_system_t sys, lmm_constraint_t cnst)
391 return xbt_swag_belongs(cnst, &(sys->active_constraint_set));
394 lmm_constraint_t lmm_get_first_active_constraint(lmm_system_t sys)
396 return xbt_swag_getFirst(&(sys->active_constraint_set));
399 lmm_constraint_t lmm_get_next_active_constraint(lmm_system_t sys, lmm_constraint_t cnst)
401 return xbt_swag_getNext(cnst,(sys->active_constraint_set).offset);
405 /* void lmm_print(lmm_system_t sys) */
407 /* lmm_variable_t var = NULL; */
408 /* lmm_constraint_t cnst = NULL; */
409 /* lmm_element_t elem = NULL; */
410 /* xbt_swag_t cnst_list = NULL; */
411 /* xbt_swag_t var_list = NULL; */
412 /* xbt_swag_t elem_list = NULL; */
414 /* var_list = &(sys->variable_set); */
415 /* xbt_swag_foreach(var, var_list) { */
416 /* printf("%s : {\n",var->id); */
417 /* printf("\t %s : {\n",var->id); */