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 "xbt/mallocator.h"
12 #include "maxmin_private.h"
15 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_maxmin, surf,
16 "Logging specific to SURF (maxmin)");
18 static void* lmm_variable_mallocator_new_f(void);
19 static void lmm_variable_mallocator_free_f(void *var);
20 static void lmm_variable_mallocator_reset_f(void *var);
22 lmm_system_t lmm_system_new(void)
24 lmm_system_t l = NULL;
26 s_lmm_constraint_t cnst;
28 l = xbt_new0(s_lmm_system_t, 1);
31 xbt_swag_init(&(l->variable_set),
32 xbt_swag_offset(var, variable_set_hookup));
33 xbt_swag_init(&(l->constraint_set),
34 xbt_swag_offset(cnst, constraint_set_hookup));
36 xbt_swag_init(&(l->active_constraint_set),
37 xbt_swag_offset(cnst, active_constraint_set_hookup));
39 xbt_swag_init(&(l->saturated_variable_set),
40 xbt_swag_offset(var, saturated_variable_set_hookup));
41 xbt_swag_init(&(l->saturated_constraint_set),
42 xbt_swag_offset(cnst, saturated_constraint_set_hookup));
44 l->variable_mallocator = xbt_mallocator_new(64,
45 lmm_variable_mallocator_new_f,
46 lmm_variable_mallocator_free_f,
47 lmm_variable_mallocator_reset_f);
52 void lmm_system_free(lmm_system_t sys)
54 lmm_variable_t var = NULL;
55 lmm_constraint_t cnst = NULL;
57 while ((var = extract_variable(sys)))
58 lmm_var_free(sys, var);
60 while ((cnst = extract_constraint(sys)))
61 lmm_cnst_free(sys, cnst);
63 xbt_mallocator_free(sys->variable_mallocator);
67 void lmm_variable_disable(lmm_system_t sys, lmm_variable_t var)
70 lmm_element_t elem = NULL;
72 XBT_IN2("(sys=%p, var=%p)",sys,var);
75 for (i = 0; i < var->cnsts_number; i++) {
76 elem = &var->cnsts[i];
77 xbt_swag_remove(elem, &(elem->constraint->element_set));
78 xbt_swag_remove(elem, &(elem->constraint->active_element_set));
79 if (!xbt_swag_size(&(elem->constraint->element_set)))
80 make_constraint_inactive(sys, elem->constraint);
82 var->cnsts_number = 0;
86 static void lmm_var_free(lmm_system_t sys, lmm_variable_t var)
89 lmm_variable_disable(sys, var);
91 xbt_mallocator_release(sys->variable_mallocator, var);
94 static void lmm_cnst_free(lmm_system_t sys, lmm_constraint_t cnst)
96 /* xbt_assert0(xbt_swag_size(&(cnst->element_set)), */
97 /* "This list should be empty!"); */
98 remove_active_constraint(sys, cnst);
102 lmm_constraint_t lmm_constraint_new(lmm_system_t sys, void *id,
105 lmm_constraint_t cnst = NULL;
106 s_lmm_element_t elem;
108 cnst = xbt_new0(s_lmm_constraint_t, 1);
110 xbt_swag_init(&(cnst->element_set),
111 xbt_swag_offset(elem, element_set_hookup));
112 xbt_swag_init(&(cnst->active_element_set),
113 xbt_swag_offset(elem, active_element_set_hookup));
115 cnst->bound = bound_value;
118 insert_constraint(sys, cnst);
123 void lmm_constraint_shared(lmm_constraint_t cnst)
128 void lmm_constraint_free(lmm_system_t sys, lmm_constraint_t cnst)
130 remove_constraint(sys, cnst);
131 lmm_cnst_free(sys, cnst);
134 static void* lmm_variable_mallocator_new_f(void) {
135 return xbt_new(s_lmm_variable_t, 1);
138 static void lmm_variable_mallocator_free_f(void *var) {
142 static void lmm_variable_mallocator_reset_f(void *var) {
143 /* memset to zero like calloc */
144 memset(var, 0, sizeof(s_lmm_variable_t));
147 lmm_variable_t lmm_variable_new(lmm_system_t sys, void *id,
149 double bound, int number_of_constraints)
151 lmm_variable_t var = NULL;
154 XBT_IN5("(sys=%p, id=%p, weight=%f, bound=%f, num_cons =%d)",
155 sys,id,weight,bound,number_of_constraints);
157 var = xbt_mallocator_get(sys->variable_mallocator);
159 var->cnsts = xbt_new0(s_lmm_element_t, number_of_constraints);
160 for(i=0; i<number_of_constraints; i++) {
161 /* Should be useless because of the
162 calloc but it seems to help valgrind... */
163 var->cnsts[i].element_set_hookup.next = NULL;
164 var->cnsts[i].element_set_hookup.prev = NULL;
165 var->cnsts[i].active_element_set_hookup.next = NULL;
166 var->cnsts[i].active_element_set_hookup.prev = NULL;
167 var->cnsts[i].constraint = NULL;
168 var->cnsts[i].variable = NULL;
169 var->cnsts[i].value = 0.0;
171 var->cnsts_size = number_of_constraints;
172 var->cnsts_number = 0; /* Should be useless because of the
173 calloc but it seems to help valgrind... */
174 var->weight = weight;
179 var->func_f = func_f_def;
180 var->func_fp = func_fp_def;
181 var->func_fpi = func_fpi_def;
182 var->func_fpip = func_fpip_def;
184 if(weight) xbt_swag_insert_at_head(var,&(sys->variable_set));
185 else xbt_swag_insert_at_tail(var,&(sys->variable_set));
190 void lmm_variable_free(lmm_system_t sys, lmm_variable_t var)
192 remove_variable(sys, var);
193 lmm_var_free(sys, var);
196 double lmm_variable_getvalue(lmm_variable_t var)
201 void lmm_expand(lmm_system_t sys, lmm_constraint_t cnst,
202 lmm_variable_t var, double value)
204 lmm_element_t elem = NULL;
208 xbt_assert0(var->cnsts_number < var->cnsts_size,
209 "Too much constraints");
211 elem = &(var->cnsts[var->cnsts_number++]);
214 elem->constraint = cnst;
215 elem->variable = var;
217 if(var->weight) xbt_swag_insert_at_head(elem,&(elem->constraint->element_set));
218 else xbt_swag_insert_at_tail(elem,&(elem->constraint->element_set));
220 make_constraint_active(sys, cnst);
223 void lmm_expand_add(lmm_system_t sys, lmm_constraint_t cnst,
224 lmm_variable_t var, double value)
229 for(i=0; i< var->cnsts_number ; i++)
230 if(var->cnsts[i].constraint == cnst) break;
232 if(i<var->cnsts_number) var->cnsts[i].value +=value;
233 else lmm_expand(sys,cnst,var,value);
236 void lmm_elem_set_value(lmm_system_t sys, lmm_constraint_t cnst,
237 lmm_variable_t var, double value)
241 for(i=0; i< var->cnsts_number ; i++)
242 if(var->cnsts[i].constraint == cnst) break;
244 if(i<var->cnsts_number) {
245 var->cnsts[i].value =value;
247 } else DIE_IMPOSSIBLE;
250 lmm_constraint_t lmm_get_cnst_from_var(lmm_system_t sys,
251 lmm_variable_t var, int num)
253 if (num < var->cnsts_number)
254 return (var->cnsts[num].constraint);
259 int lmm_get_number_of_cnst_from_var(lmm_system_t sys, lmm_variable_t var)
261 return (var->cnsts_number);
264 lmm_variable_t lmm_get_var_from_cnst(lmm_system_t sys,
265 lmm_constraint_t cnst,
266 lmm_variable_t * var)
269 xbt_swag_getFirst(&(cnst->element_set));
271 *var = xbt_swag_getNext(*var, cnst->element_set.offset);
275 void *lmm_constraint_id(lmm_constraint_t cnst)
280 void *lmm_variable_id(lmm_variable_t var)
285 static void saturated_constraint_set_update(lmm_system_t sys,
286 lmm_constraint_t cnst,
289 lmm_constraint_t useless_cnst = NULL;
291 XBT_IN3("sys=%p, cnst=%p, min_usage=%f",sys,cnst,*min_usage);
292 if (cnst->usage <= 0) {
296 if (cnst->remaining <= 0) {
300 if ((*min_usage < 0) || (*min_usage > cnst->remaining / cnst->usage)) {
301 *min_usage = cnst->remaining / cnst->usage;
302 LOG3(xbt_log_priority_trace,
303 "min_usage=%f (cnst->remaining=%f, cnst->usage=%f)",*min_usage,
304 cnst->remaining, cnst->usage);
305 while ((useless_cnst =
306 xbt_swag_getFirst(&(sys->saturated_constraint_set))))
307 xbt_swag_remove(useless_cnst, &(sys->saturated_constraint_set));
309 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
310 } else if (*min_usage == cnst->remaining / cnst->usage) {
311 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
316 static void saturated_variable_set_update(lmm_system_t sys)
318 lmm_constraint_t cnst = NULL;
319 xbt_swag_t cnst_list = NULL;
320 lmm_element_t elem = NULL;
321 xbt_swag_t elem_list = NULL;
323 cnst_list = &(sys->saturated_constraint_set);
324 while ((cnst = xbt_swag_getFirst(cnst_list))) {
325 elem_list = &(cnst->active_element_set);
326 xbt_swag_foreach(elem, elem_list) {
327 if(elem->variable->weight<=0) break;
328 if ((elem->value > 0))
329 xbt_swag_insert(elem->variable, &(sys->saturated_variable_set));
331 xbt_swag_remove(cnst, cnst_list);
335 void lmm_print(lmm_system_t sys)
338 lmm_constraint_t cnst = NULL;
339 lmm_element_t elem = NULL;
340 lmm_variable_t var = NULL;
341 xbt_swag_t cnst_list = NULL;
342 xbt_swag_t var_list = NULL;
343 xbt_swag_t elem_list = NULL;
344 char print_buf[1024];
345 char *trace_buf=xbt_malloc0(sizeof(char));
348 /* Printing Objective */
349 var_list = &(sys->variable_set);
350 sprintf(print_buf,"MAX-MIN ( ");
351 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
352 strcat(trace_buf, print_buf);
353 xbt_swag_foreach(var, var_list) {
354 sprintf(print_buf,"'%p'(%f) ",var,var->weight);
355 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
356 strcat(trace_buf, print_buf);
358 sprintf(print_buf,")");
359 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
360 strcat(trace_buf, print_buf);
361 DEBUG1("%s",trace_buf);
364 /* Printing Constraints */
365 cnst_list = &(sys->active_constraint_set);
366 xbt_swag_foreach(cnst, cnst_list) {
368 elem_list = &(cnst->element_set);
369 sprintf(print_buf,"\t");
370 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
371 strcat(trace_buf, print_buf);
372 xbt_swag_foreach(elem, elem_list) {
373 sprintf(print_buf,"%f.'%p'(%f) + ",elem->value,
374 elem->variable,elem->variable->value);
375 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
376 strcat(trace_buf, print_buf);
377 sum += elem->value * elem->variable->value;
379 sprintf(print_buf,"0 <= %f ('%p')",cnst->bound,cnst);
380 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
381 strcat(trace_buf, print_buf);
384 sprintf(print_buf," [MAX-Constraint]");
385 trace_buf = xbt_realloc(trace_buf,strlen(trace_buf)+strlen(print_buf)+1);
386 strcat(trace_buf, print_buf);
388 DEBUG1("%s",trace_buf);
390 xbt_assert3(!double_positive(sum-cnst->bound), "Incorrect value (%f is not smaller than %f): %g",
391 sum,cnst->bound,sum-cnst->bound);
394 /* Printing Result */
395 xbt_swag_foreach(var, var_list) {
397 DEBUG4("'%p'(%f) : %f (<=%f)",var,var->weight,var->value, var->bound);
398 xbt_assert0(!double_positive(var->value-var->bound), "Incorrect value");
401 DEBUG3("'%p'(%f) : %f",var,var->weight,var->value);
407 void lmm_solve(lmm_system_t sys)
409 lmm_variable_t var = NULL;
410 lmm_constraint_t cnst = NULL;
411 lmm_element_t elem = NULL;
412 xbt_swag_t cnst_list = NULL;
413 xbt_swag_t var_list = NULL;
414 xbt_swag_t elem_list = NULL;
415 double min_usage = -1;
417 if (!(sys->modified))
421 var_list = &(sys->variable_set);
422 DEBUG1("Variable set : %d", xbt_swag_size(var_list));
423 xbt_swag_foreach(var, var_list) {
428 * Compute Usage and store the variables that reach the maximum.
430 cnst_list = &(sys->active_constraint_set);
431 DEBUG1("Active constraints : %d", xbt_swag_size(cnst_list));
432 xbt_swag_foreach(cnst, cnst_list) {
434 cnst->remaining = cnst->bound;
436 elem_list = &(cnst->element_set);
438 xbt_swag_foreach(elem, elem_list) {
439 if(elem->variable->weight <=0) break;
440 if ((elem->value > 0)) {
442 cnst->usage += elem->value / elem->variable->weight;
444 if(cnst->usage<elem->value / elem->variable->weight)
445 cnst->usage = elem->value / elem->variable->weight;
446 DEBUG2("Constraint Usage %p : %f",cnst,cnst->usage);
447 make_elem_active(elem);
450 /* Saturated constraints update */
451 saturated_constraint_set_update(sys, cnst, &min_usage);
453 saturated_variable_set_update(sys);
455 /* Saturated variables update */
458 /* Fix the variables that have to be */
459 var_list = &(sys->saturated_variable_set);
461 xbt_swag_foreach(var, var_list) {
462 /* First check if some of these variables have reach their upper
463 bound and update min_usage accordingly. */
464 DEBUG5("var=%p, var->bound=%f, var->weight=%f, min_usage=%f, var->bound*var->weight=%f",
465 var, var->bound, var->weight, min_usage,var->bound * var->weight);
466 if ((var->bound > 0) && (var->bound * var->weight < min_usage)) {
467 min_usage = var->bound * var->weight;
468 DEBUG1("Updated min_usage=%f",min_usage);
473 while ((var = xbt_swag_getFirst(var_list))) {
476 var->value = min_usage / var->weight;
477 DEBUG5("Min usage: %f, Var(%p)->weight: %f, Var(%p)->value: %f ",min_usage,var,var->weight,var,var->value);
482 for (i = 0; i < var->cnsts_number; i++) {
483 elem = &var->cnsts[i];
484 cnst = elem->constraint;
486 double_update(&(cnst->remaining), elem->value * var->value);
487 double_update(&(cnst->usage), elem->value / var->weight);
488 make_elem_inactive(elem);
489 } else { /* FIXME one day: We recompute usage.... :( */
491 make_elem_inactive(elem);
492 xbt_swag_foreach(elem, elem_list) {
493 if(elem->variable->weight <=0) break;
494 if(elem->variable->value > 0) break;
495 if ((elem->value > 0)) {
496 if(cnst->usage<elem->value / elem->variable->weight)
497 cnst->usage = elem->value / elem->variable->weight;
498 DEBUG2("Constraint Usage %p : %f",cnst,cnst->usage);
499 make_elem_active(elem);
504 xbt_swag_remove(var, var_list);
507 /* Find out which variables reach the maximum */
508 cnst_list = &(sys->active_constraint_set);
510 xbt_swag_foreach(cnst, cnst_list) {
511 saturated_constraint_set_update(sys, cnst, &min_usage);
513 saturated_variable_set_update(sys);
515 } while (xbt_swag_size(&(sys->saturated_variable_set)));
518 if(XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
523 /* Not a O(1) function */
525 void lmm_update(lmm_system_t sys, lmm_constraint_t cnst,
526 lmm_variable_t var, double value)
531 for (i = 0; i < var->cnsts_number; i++)
532 if (var->cnsts[i].constraint == cnst) {
533 var->cnsts[i].value = value;
538 /** \brief Attribute the value bound to var->bound.
540 * \param sys the lmm_system_t
541 * \param var the lmm_variable_t
542 * \param bound the new bound to associate with var
544 * Makes var->bound equal to bound. Whenever this function is called
545 * a change is signed in the system. To
546 * avoid false system changing detection it is a good idea to test
547 * (bound != 0) before calling it.
550 void lmm_update_variable_bound(lmm_system_t sys, lmm_variable_t var,
557 /** \brief Add the value delta to var->df (the sum of latencies).
559 * \param sys the lmm_system_t associated
560 * \param var the lmm_variable_t which need to updated
561 * \param delta the variation of the latency
563 * Add the value delta to var->df (the sum of latencys associated to the
564 * flow). Whenever this function is called a change is signed in the system. To
565 * avoid false system changing detection it is a good idea to test
566 * (delta != 0) before calling it.
569 void lmm_update_variable_latency(lmm_system_t sys, lmm_variable_t var,
576 void lmm_update_variable_weight(lmm_system_t sys, lmm_variable_t var,
582 XBT_IN3("(sys=%p, var=%p, weight=%f)",sys,var,weight);
584 var->weight = weight;
585 xbt_swag_remove(var,&(sys->variable_set));
586 if(weight) xbt_swag_insert_at_head(var,&(sys->variable_set));
587 else xbt_swag_insert_at_tail(var,&(sys->variable_set));
589 for (i = 0; i < var->cnsts_number; i++) {
590 elem = &var->cnsts[i];
591 xbt_swag_remove(elem, &(elem->constraint->element_set));
592 if(weight) xbt_swag_insert_at_head(elem, &(elem->constraint->element_set));
593 else xbt_swag_insert_at_tail(elem, &(elem->constraint->element_set));
598 double lmm_get_variable_weight(lmm_variable_t var)
604 void lmm_update_constraint_bound(lmm_system_t sys, lmm_constraint_t cnst,
611 int lmm_constraint_used(lmm_system_t sys, lmm_constraint_t cnst)
613 return xbt_swag_belongs(cnst, &(sys->active_constraint_set));
616 lmm_constraint_t lmm_get_first_active_constraint(lmm_system_t sys)
618 return xbt_swag_getFirst(&(sys->active_constraint_set));
621 lmm_constraint_t lmm_get_next_active_constraint(lmm_system_t sys, lmm_constraint_t cnst)
623 return xbt_swag_getNext(cnst,(sys->active_constraint_set).offset);
628 /** \brief Attribute the value bound to var->bound.
630 * \param func_f default function f associated with the chosen protocol flavor
631 * \param func_fp partial differential of f (f prime, f')
632 * \param func_fpi inverse of the partial differential of f (f prime inverse, (f')^{-1})
633 * \param func_fpip partial differential of the inverse of the partial differential of f (f prime inverse prime, ((f')^{-1})')
635 * Set default functions to the ones passed as parameters. This is a polimorfism in C pure, enjoy the roots of programming.
638 void lmm_set_default_protocol_functions(double (* func_f) (lmm_variable_t var, double x),
639 double (* func_fp) (lmm_variable_t var, double x),
640 double (* func_fpi) (lmm_variable_t var, double x),
641 double (* func_fpip) (lmm_variable_t var, double x))
645 func_fp_def = func_fp;
646 func_fpi_def = func_fpi;
647 func_fpip_def = func_fpip;
652 * NOTE for Reno: all functions consider the network
653 * coeficient (alpha) equal to 1.
657 * For Vegas f: $\alpha_f d_f \log\left(x_f\right)$
659 double func_vegas_f(lmm_variable_t var, double x){
660 return var->df * log(x);
664 * For Vegas fp: $\frac{\alpha D_f}{x}$
666 double func_vegas_fp(lmm_variable_t var, double x){
667 //avoid a disaster value - c'est du bricolage mais ca marche
668 /* if(x == 0) x = 10e-8; */
673 * For Vegas fpi: $\frac{\alpha D_f}{x}$
675 double func_vegas_fpi(lmm_variable_t var, double x){
676 //avoid a disaster value - c'est du bricolage mais ca marche
677 /* if(x == 0) x = 10e-8; */
682 * For Vegas fpip: $-\frac{\alpha D_f}{x^2}$
684 double func_vegas_fpip(lmm_variable_t var, double x){
685 //avoid a disaster value - c'est du bricolage mais ca marche
686 /* if(x == 0) x = 10e-8; */
687 return -( var->df/(x*x) ) ;
692 * For Reno f: $\frac{\sqrt{\frac{3}{2}}}{D_f} \arctan\left(\sqrt{\frac{3}{2}}x_f D_f\right)$
694 double func_reno_f(lmm_variable_t var, double x){
695 xbt_assert0(var->df>0.0,"Don't call me with stupid values!");
696 // \sqrt{3/2} = 0.8164965808
697 return (0.8164965808 / var->df) * atan( (0.8164965808 / var->df)*x );
701 * For Reno fp: $\frac{3}{3 {D_f}^2 x^2 + 2}$
703 double func_reno_fp(lmm_variable_t var, double x){
704 return 3 / (3*var->df*var->df*x*x + 2);
708 * For Reno fpi: $\sqrt{\frac{1}{{D_f}^2 x} - \frac{2}{3{D_f}^2}}$
710 double func_reno_fpi(lmm_variable_t var, double x){
713 xbt_assert0(var->df>0.0,"Don't call me with stupid values!");
714 xbt_assert0(x>0.0,"Don't call me with stupid values!");
716 res_fpi = 1/(var->df*var->df*x) - 2/(3*var->df*var->df);
717 if(res_fpi<=0.0) return 0.0;
718 xbt_assert0(res_fpi>0.0,"Don't call me with stupid values!");
719 return sqrt(res_fpi);
723 * For Reno fpip: $-\frac{1}{2 {D_f}^2 x^2\sqrt{\frac{1}{{D_f}^2 x} - \frac{2}{3{D_f}^2}}}$
725 double func_reno_fpip(lmm_variable_t var, double x){
727 double critical_test;
729 xbt_assert0(var->df>0.0,"Don't call me with stupid values!");
730 xbt_assert0(x>0.0,"Don't call me with stupid values!");
732 res_fpip = 1/(var->df*var->df*x) - 2/(3*var->df*var->df);
733 xbt_assert0(res_fpip>0.0,"Don't call me with stupid values!");
734 critical_test = (2*var->df*var->df*x*x*sqrt(res_fpip));
736 return -(1.0/critical_test);