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(surf_maxmin, surf,
14 "Logging specific to SURF (maxmin)");
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;
60 XBT_IN2("(sys=%p, var=%p)",sys,var);
63 for (i = 0; i < var->cnsts_number; i++) {
64 elem = &var->cnsts[i];
65 xbt_swag_remove(elem, &(elem->constraint->element_set));
66 xbt_swag_remove(elem, &(elem->constraint->active_element_set));
67 if (!xbt_swag_size(&(elem->constraint->element_set)))
68 make_constraint_inactive(sys, elem->constraint);
70 var->cnsts_number = 0;
74 static void lmm_var_free(lmm_system_t sys, lmm_variable_t var)
77 lmm_variable_disable(sys, var);
78 memset(var->cnsts,0,var->cnsts_size*sizeof(s_lmm_element_t));
83 static void lmm_cnst_free(lmm_system_t sys, lmm_constraint_t cnst)
85 /* xbt_assert0(xbt_swag_size(&(cnst->element_set)), */
86 /* "This list should be empty!"); */
87 remove_active_constraint(sys, cnst);
91 lmm_constraint_t lmm_constraint_new(lmm_system_t sys, void *id,
94 lmm_constraint_t cnst = NULL;
97 cnst = xbt_new0(s_lmm_constraint_t, 1);
99 xbt_swag_init(&(cnst->element_set),
100 xbt_swag_offset(elem, element_set_hookup));
101 xbt_swag_init(&(cnst->active_element_set),
102 xbt_swag_offset(elem, active_element_set_hookup));
104 cnst->bound = bound_value;
107 insert_constraint(sys, cnst);
112 void lmm_constraint_shared(lmm_constraint_t cnst)
117 void lmm_constraint_free(lmm_system_t sys, lmm_constraint_t cnst)
119 remove_constraint(sys, cnst);
120 lmm_cnst_free(sys, cnst);
123 lmm_variable_t lmm_variable_new(lmm_system_t sys, void *id,
125 double bound, int number_of_constraints)
127 lmm_variable_t var = NULL;
130 XBT_IN5("(sys=%p, id=%p, weight=%f, bound=%f, num_cons =%d)",
131 sys,id,weight,bound,number_of_constraints);
133 var = xbt_new0(s_lmm_variable_t, 1);
135 var->cnsts = xbt_new0(s_lmm_element_t, number_of_constraints);
136 for(i=0; i<number_of_constraints; i++) {
137 /* Should be useless because of the
138 calloc but it seems to help valgrind... */
139 var->cnsts[i].element_set_hookup.next = NULL;
140 var->cnsts[i].element_set_hookup.prev = NULL;
141 var->cnsts[i].active_element_set_hookup.next = NULL;
142 var->cnsts[i].active_element_set_hookup.prev = NULL;
143 var->cnsts[i].constraint = NULL;
144 var->cnsts[i].variable = NULL;
145 var->cnsts[i].value = 0.0;
147 var->cnsts_size = number_of_constraints;
148 var->cnsts_number = 0; /* Should be useless because of the
149 calloc but it seems to help valgrind... */
150 var->weight = weight;
153 if(weight) xbt_swag_insert_at_head(var,&(sys->variable_set));
154 else xbt_swag_insert_at_tail(var,&(sys->variable_set));
159 void lmm_variable_free(lmm_system_t sys, lmm_variable_t var)
161 remove_variable(sys, var);
162 lmm_var_free(sys, var);
165 double lmm_variable_getvalue(lmm_variable_t var)
170 void lmm_expand(lmm_system_t sys, lmm_constraint_t cnst,
171 lmm_variable_t var, double value)
173 lmm_element_t elem = NULL;
177 xbt_assert0(var->cnsts_number < var->cnsts_size,
178 "Too much constraints");
180 elem = &(var->cnsts[var->cnsts_number++]);
183 elem->constraint = cnst;
184 elem->variable = var;
186 if(var->weight) xbt_swag_insert_at_head(elem,&(elem->constraint->element_set));
187 else xbt_swag_insert_at_tail(elem,&(elem->constraint->element_set));
189 make_constraint_active(sys, cnst);
192 void lmm_expand_add(lmm_system_t sys, lmm_constraint_t cnst,
193 lmm_variable_t var, double value)
198 for(i=0; i< var->cnsts_number ; i++)
199 if(var->cnsts[i].constraint == cnst) break;
201 if(i<var->cnsts_number) var->cnsts[i].value +=value;
202 else lmm_expand(sys,cnst,var,value);
205 void lmm_elem_set_value(lmm_system_t sys, lmm_constraint_t cnst,
206 lmm_variable_t var, double value)
210 for(i=0; i< var->cnsts_number ; i++)
211 if(var->cnsts[i].constraint == cnst) break;
213 if(i<var->cnsts_number) {
214 var->cnsts[i].value =value;
216 } else DIE_IMPOSSIBLE;
219 lmm_constraint_t lmm_get_cnst_from_var(lmm_system_t sys,
220 lmm_variable_t var, int num)
222 if (num < var->cnsts_number)
223 return (var->cnsts[num].constraint);
228 int lmm_get_number_of_cnst_from_var(lmm_system_t sys, lmm_variable_t var)
230 return (var->cnsts_number);
233 lmm_variable_t lmm_get_var_from_cnst(lmm_system_t sys,
234 lmm_constraint_t cnst,
235 lmm_variable_t * var)
238 xbt_swag_getFirst(&(cnst->element_set));
240 *var = xbt_swag_getNext(*var, cnst->element_set.offset);
244 void *lmm_constraint_id(lmm_constraint_t cnst)
249 void *lmm_variable_id(lmm_variable_t var)
254 static void saturated_constraint_set_update(lmm_system_t sys,
255 lmm_constraint_t cnst,
258 lmm_constraint_t useless_cnst = NULL;
260 XBT_IN3("sys=%p, cnst=%p, min_usage=%f",sys,cnst,*min_usage);
261 if (cnst->usage <= 0) {
265 if (cnst->remaining <= 0) {
269 if ((*min_usage < 0) || (*min_usage > cnst->remaining / cnst->usage)) {
270 *min_usage = cnst->remaining / cnst->usage;
271 LOG3(xbt_log_priority_trace,
272 "min_usage=%f (cnst->remaining=%f, cnst->usage=%f)",*min_usage,
273 cnst->remaining, cnst->usage);
274 while ((useless_cnst =
275 xbt_swag_getFirst(&(sys->saturated_constraint_set))))
276 xbt_swag_remove(useless_cnst, &(sys->saturated_constraint_set));
278 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
279 } else if (*min_usage == cnst->remaining / cnst->usage) {
280 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
285 static void saturated_variable_set_update(lmm_system_t sys)
287 lmm_constraint_t cnst = NULL;
288 xbt_swag_t cnst_list = NULL;
289 lmm_element_t elem = NULL;
290 xbt_swag_t elem_list = NULL;
292 cnst_list = &(sys->saturated_constraint_set);
293 while ((cnst = xbt_swag_getFirst(cnst_list))) {
294 elem_list = &(cnst->active_element_set);
295 xbt_swag_foreach(elem, elem_list) {
296 if(elem->variable->weight<=0) break;
297 if ((elem->value > 0))
298 xbt_swag_insert(elem->variable, &(sys->saturated_variable_set));
300 xbt_swag_remove(cnst, cnst_list);
304 static void lmm_print(lmm_system_t sys)
306 lmm_constraint_t cnst = NULL;
307 lmm_element_t elem = NULL;
308 lmm_variable_t var = NULL;
309 xbt_swag_t cnst_list = NULL;
310 xbt_swag_t var_list = NULL;
311 xbt_swag_t elem_list = NULL;
312 char print_buf[1024];
313 char *trace_buf=xbt_malloc0(sizeof(char));
316 /* Printing Objective */
317 var_list = &(sys->variable_set);
318 sprintf(print_buf,"MAX-MIN ( ");
319 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
320 strcat(trace_buf, print_buf);
321 xbt_swag_foreach(var, var_list) {
322 sprintf(print_buf,"'%p'(%f) ",var,var->weight);
323 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
324 strcat(trace_buf, print_buf);
326 sprintf(print_buf,")");
327 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
328 strcat(trace_buf, print_buf);
329 DEBUG1("%s",trace_buf);
332 /* Printing Constraints */
333 cnst_list = &(sys->active_constraint_set);
334 xbt_swag_foreach(cnst, cnst_list) {
336 elem_list = &(cnst->element_set);
337 sprintf(print_buf,"\t");
338 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
339 strcat(trace_buf, print_buf);
340 xbt_swag_foreach(elem, elem_list) {
341 sprintf(print_buf,"%f.'%p'(%f) + ",elem->value,
342 elem->variable,elem->variable->weight);
343 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
344 strcat(trace_buf, print_buf);
345 sum += elem->value * elem->variable->value;
347 sprintf(print_buf,"0 <= %f ('%p')",cnst->bound,cnst);
348 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
349 strcat(trace_buf, print_buf);
350 DEBUG1("%s",trace_buf);
352 xbt_assert0((sum<=cnst->bound), "Incorrect value");
355 /* Printing Result */
356 xbt_swag_foreach(var, var_list) {
358 DEBUG4("'%p'(%f) : %f (<=%f)",var,var->weight,var->value, var->bound);
359 xbt_assert0((var->value<=var->bound), "Incorrect value");
362 DEBUG3("'%p'(%f) : %f",var,var->weight,var->value);
368 void lmm_solve(lmm_system_t sys)
370 lmm_variable_t var = NULL;
371 lmm_constraint_t cnst = NULL;
372 lmm_element_t elem = NULL;
373 xbt_swag_t cnst_list = NULL;
374 xbt_swag_t var_list = NULL;
375 xbt_swag_t elem_list = NULL;
376 double min_usage = -1;
378 if (!(sys->modified))
382 var_list = &(sys->variable_set);
383 DEBUG1("Variable set : %d", xbt_swag_size(var_list));
384 xbt_swag_foreach(var, var_list) {
389 /* Compute Usage and store the variables that reach the maximum */
391 cnst_list = &(sys->active_constraint_set);
392 DEBUG1("Active constraints : %d", xbt_swag_size(cnst_list));
393 xbt_swag_foreach(cnst, cnst_list) {
395 cnst->remaining = cnst->bound;
397 elem_list = &(cnst->element_set);
398 xbt_swag_foreach(elem, elem_list) {
399 if(elem->variable->weight <=0) break;
400 if ((elem->value > 0)) {
402 cnst->usage += elem->value / elem->variable->weight;
405 make_elem_active(elem);
409 /* Saturated constraints update */
410 saturated_constraint_set_update(sys, cnst, &min_usage);
413 saturated_variable_set_update(sys);
415 /* Saturated variables update */
418 /* Fix the variables that have to be */
419 var_list = &(sys->saturated_variable_set);
421 xbt_swag_foreach(var, var_list) {
422 /* First check if some of these variables have reach their upper
423 bound and update min_usage accordingly. */
424 DEBUG5("var=%p, var->bound=%f, var->weight=%f, min_usage=%f, var->bound*var->weight=%f",
425 var, var->bound, var->weight, min_usage,var->bound * var->weight);
426 if ((var->bound > 0) && (var->bound * var->weight < min_usage)) {
427 min_usage = var->bound * var->weight;
428 DEBUG1("Updated min_usage=%f",min_usage);
433 while ((var = xbt_swag_getFirst(var_list))) {
436 var->value = min_usage / var->weight;
440 for (i = 0; i < var->cnsts_number; i++) {
441 elem = &var->cnsts[i];
442 cnst = elem->constraint;
444 cnst->remaining -= elem->value * var->value;
445 cnst->usage -= elem->value / var->weight;
447 make_elem_inactive(elem);
449 xbt_swag_remove(var, var_list);
452 /* Find out which variables reach the maximum */
453 cnst_list = &(sys->active_constraint_set);
455 xbt_swag_foreach(cnst, cnst_list) {
456 saturated_constraint_set_update(sys, cnst, &min_usage);
458 saturated_variable_set_update(sys);
460 } while (xbt_swag_size(&(sys->saturated_variable_set)));
463 if(XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
468 /* Not a O(1) function */
470 void lmm_update(lmm_system_t sys, lmm_constraint_t cnst,
471 lmm_variable_t var, double value)
476 for (i = 0; i < var->cnsts_number; i++)
477 if (var->cnsts[i].constraint == cnst) {
478 var->cnsts[i].value = value;
483 void lmm_update_variable_bound(lmm_system_t sys, lmm_variable_t var,
490 void lmm_update_variable_weight(lmm_system_t sys, lmm_variable_t var,
496 XBT_IN3("(sys=%p, var=%p, weight=%f)",sys,var,weight);
498 var->weight = weight;
499 xbt_swag_remove(var,&(sys->variable_set));
500 if(weight) xbt_swag_insert_at_head(var,&(sys->variable_set));
501 else xbt_swag_insert_at_tail(var,&(sys->variable_set));
503 for (i = 0; i < var->cnsts_number; i++) {
504 elem = &var->cnsts[i];
505 xbt_swag_remove(elem, &(elem->constraint->element_set));
506 if(weight) xbt_swag_insert_at_head(elem, &(elem->constraint->element_set));
507 else xbt_swag_insert_at_tail(elem, &(elem->constraint->element_set));
512 double lmm_get_variable_weight(lmm_variable_t var)
518 void lmm_update_constraint_bound(lmm_system_t sys, lmm_constraint_t cnst,
525 int lmm_constraint_used(lmm_system_t sys, lmm_constraint_t cnst)
527 return xbt_swag_belongs(cnst, &(sys->active_constraint_set));
530 lmm_constraint_t lmm_get_first_active_constraint(lmm_system_t sys)
532 return xbt_swag_getFirst(&(sys->active_constraint_set));
535 lmm_constraint_t lmm_get_next_active_constraint(lmm_system_t sys, lmm_constraint_t cnst)
537 return xbt_swag_getNext(cnst,(sys->active_constraint_set).offset);