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 if (!xbt_swag_size(&(elem->constraint->element_set)))
66 make_constraint_inactive(sys, elem->constraint);
68 var->cnsts_number = 0;
71 static void lmm_var_free(lmm_system_t sys, lmm_variable_t var)
74 lmm_variable_disable(sys, var);
80 static void lmm_cnst_free(lmm_system_t sys, lmm_constraint_t cnst)
82 /* xbt_assert0(xbt_swag_size(&(cnst->element_set)), */
83 /* "This list should be empty!"); */
84 remove_active_constraint(sys, cnst);
88 lmm_constraint_t lmm_constraint_new(lmm_system_t sys, void *id,
91 lmm_constraint_t cnst = NULL;
94 cnst = xbt_new0(s_lmm_constraint_t, 1);
96 xbt_swag_init(&(cnst->element_set),
97 xbt_swag_offset(elem, element_set_hookup));
98 xbt_swag_init(&(cnst->active_element_set),
99 xbt_swag_offset(elem, active_element_set_hookup));
101 cnst->bound = bound_value;
103 insert_constraint(sys, cnst);
108 void lmm_constraint_free(lmm_system_t sys, lmm_constraint_t cnst)
110 remove_constraint(sys, cnst);
111 lmm_cnst_free(sys, cnst);
114 lmm_variable_t lmm_variable_new(lmm_system_t sys, void *id,
116 double bound, int number_of_constraints)
118 lmm_variable_t var = NULL;
120 var = xbt_new0(s_lmm_variable_t, 1);
122 var->cnsts = xbt_new0(s_lmm_element_t, number_of_constraints);
123 var->cnsts_size = number_of_constraints;
124 /* var->cnsts_number = 0; *//* Useless because of the calloc */
125 var->weight = weight;
128 if(weight) xbt_swag_insert_at_head(var,&(sys->variable_set));
129 else xbt_swag_insert_at_tail(var,&(sys->variable_set));
134 void lmm_variable_free(lmm_system_t sys, lmm_variable_t var)
136 remove_variable(sys, var);
137 lmm_var_free(sys, var);
140 double lmm_variable_getvalue(lmm_variable_t var)
145 void lmm_expand(lmm_system_t sys, lmm_constraint_t cnst,
146 lmm_variable_t var, double value)
148 lmm_element_t elem = NULL;
152 xbt_assert0(var->cnsts_number < var->cnsts_size,
153 "Too much constraints");
155 elem = &(var->cnsts[var->cnsts_number++]);
158 elem->constraint = cnst;
159 elem->variable = var;
161 if(var->weight) xbt_swag_insert_at_head(elem,&(elem->constraint->element_set));
162 else xbt_swag_insert_at_tail(elem,&(elem->constraint->element_set));
164 make_constraint_active(sys, cnst);
167 lmm_constraint_t lmm_get_cnst_from_var(lmm_system_t sys,
168 lmm_variable_t var, int num)
170 if (num < var->cnsts_number)
171 return (var->cnsts[num].constraint);
176 int lmm_get_number_of_cnst_from_var(lmm_system_t sys, lmm_variable_t var)
178 return (var->cnsts_number);
181 lmm_variable_t lmm_get_var_from_cnst(lmm_system_t sys,
182 lmm_constraint_t cnst,
183 lmm_variable_t * var)
186 xbt_swag_getFirst(&(cnst->element_set));
188 *var = xbt_swag_getNext(*var, cnst->element_set.offset);
192 void *lmm_constraint_id(lmm_constraint_t cnst)
197 void *lmm_variable_id(lmm_variable_t var)
202 static void saturated_constraint_set_update(lmm_system_t sys,
203 lmm_constraint_t cnst,
206 lmm_constraint_t useless_cnst = NULL;
208 if (cnst->usage <= 0)
210 if (cnst->remaining <= 0)
212 if ((*min_usage < 0) || (*min_usage > cnst->remaining / cnst->usage)) {
213 *min_usage = cnst->remaining / cnst->usage;
215 while ((useless_cnst =
216 xbt_swag_getFirst(&(sys->saturated_constraint_set))))
217 xbt_swag_remove(useless_cnst, &(sys->saturated_constraint_set));
219 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
220 } else if (*min_usage == cnst->remaining / cnst->usage) {
221 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
225 static void saturated_variable_set_update(lmm_system_t sys)
227 lmm_constraint_t cnst = NULL;
228 xbt_swag_t cnst_list = NULL;
229 lmm_element_t elem = NULL;
230 xbt_swag_t elem_list = NULL;
232 cnst_list = &(sys->saturated_constraint_set);
233 while ((cnst = xbt_swag_getFirst(cnst_list))) {
234 elem_list = &(cnst->active_element_set);
235 xbt_swag_foreach(elem, elem_list) {
236 if(elem->variable->weight<=0) break;
237 if ((elem->value > 0))
238 xbt_swag_insert(elem->variable, &(sys->saturated_variable_set));
240 xbt_swag_remove(cnst, cnst_list);
245 void lmm_solve(lmm_system_t sys)
247 lmm_variable_t var = NULL;
248 lmm_constraint_t cnst = NULL;
249 lmm_element_t elem = NULL;
250 xbt_swag_t cnst_list = NULL;
251 xbt_swag_t var_list = NULL;
252 xbt_swag_t elem_list = NULL;
253 double min_usage = -1;
255 if (!(sys->modified))
259 var_list = &(sys->variable_set);
260 xbt_swag_foreach(var, var_list) {
265 /* Compute Usage and store the variables that reach the maximum */
267 cnst_list = &(sys->active_constraint_set);
268 xbt_swag_foreach(cnst, cnst_list) {
270 elem_list = &(cnst->element_set);
271 cnst->remaining = cnst->bound;
273 xbt_swag_foreach(elem, elem_list) {
274 if(elem->variable->weight <=0) break;
275 if ((elem->value > 0)) {
276 cnst->usage += elem->value / elem->variable->weight;
277 insert_active_elem_in_constraint(elem);
281 /* Saturated constraints update */
282 saturated_constraint_set_update(sys, cnst, &min_usage);
285 saturated_variable_set_update(sys);
287 /* Saturated variables update */
290 /* Fix the variables that have to be */
291 var_list = &(sys->saturated_variable_set);
294 xbt_swag_foreach(var, var_list) {
295 /* First check if some of these variables have reach their upper
296 bound and update min_usage accordingly. */
297 if ((var->bound > 0) && (var->bound / var->weight < min_usage)) {
298 min_usage = var->bound / var->weight;
303 while ((var = xbt_swag_getFirst(var_list))) {
306 var->value = min_usage / var->weight;
310 for (i = 0; i < var->cnsts_number; i++) {
311 elem = &var->cnsts[i];
312 cnst = elem->constraint;
313 cnst->remaining -= elem->value * var->value;
314 cnst->usage -= elem->value / var->weight;
315 remove_active_elem_in_constraint(elem);
317 xbt_swag_remove(var, var_list);
320 /* Find out which variables reach the maximum */
321 cnst_list = &(sys->active_constraint_set);
323 xbt_swag_foreach(cnst, cnst_list) {
324 saturated_constraint_set_update(sys, cnst, &min_usage);
326 saturated_variable_set_update(sys);
328 } while (xbt_swag_size(&(sys->saturated_variable_set)));
333 /* Not a O(1) function */
335 void lmm_update(lmm_system_t sys, lmm_constraint_t cnst,
336 lmm_variable_t var, double value)
341 for (i = 0; i < var->cnsts_number; i++)
342 if (var->cnsts[i].constraint == cnst) {
343 var->cnsts[i].value = value;
348 void lmm_update_variable_bound(lmm_system_t sys, lmm_variable_t var,
355 void lmm_update_variable_weight(lmm_system_t sys, lmm_variable_t var,
362 var->weight = weight;
363 xbt_swag_remove(var,&(sys->variable_set));
364 if(weight) xbt_swag_insert_at_head(var,&(sys->variable_set));
365 else xbt_swag_insert_at_tail(var,&(sys->variable_set));
367 for (i = 0; i < var->cnsts_number; i++) {
368 elem = &var->cnsts[i];
369 xbt_swag_remove(elem, &(elem->constraint->element_set));
370 if(weight) xbt_swag_insert_at_head(elem, &(elem->constraint->element_set));
371 else xbt_swag_insert_at_tail(elem, &(elem->constraint->element_set));
375 double lmm_get_variable_weight(lmm_variable_t var)
381 void lmm_update_constraint_bound(lmm_system_t sys, lmm_constraint_t cnst,
388 int lmm_constraint_used(lmm_system_t sys, lmm_constraint_t cnst)
390 return xbt_swag_belongs(cnst, &(sys->active_constraint_set));
393 lmm_constraint_t lmm_get_first_active_constraint(lmm_system_t sys)
395 return xbt_swag_getFirst(&(sys->active_constraint_set));
398 lmm_constraint_t lmm_get_next_active_constraint(lmm_system_t sys, lmm_constraint_t cnst)
400 return xbt_swag_getNext(cnst,(sys->active_constraint_set).offset);
404 /* void lmm_print(lmm_system_t sys) */
406 /* lmm_variable_t var = NULL; */
407 /* lmm_constraint_t cnst = NULL; */
408 /* lmm_element_t elem = NULL; */
409 /* xbt_swag_t cnst_list = NULL; */
410 /* xbt_swag_t var_list = NULL; */
411 /* xbt_swag_t elem_list = NULL; */
413 /* var_list = &(sys->variable_set); */
414 /* xbt_swag_foreach(var, var_list) { */
415 /* printf("%s : {\n",var->id); */
416 /* printf("\t %s : {\n",var->id); */