3 /* Copyright (c) 2007 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"
15 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(surf_maxmin);
16 #define SHOW_EXPR_G(expr) DEBUG1(#expr " = %g",expr);
17 #define SHOW_EXPR_D(expr) DEBUG1(#expr " = %d",expr);
18 #define SHOW_EXPR_P(expr) DEBUG1(#expr " = %p",expr);
20 void bottleneck_solve(lmm_system_t sys)
22 lmm_variable_t var = NULL;
23 lmm_variable_t var_next = NULL;
24 lmm_constraint_t cnst = NULL;
25 s_lmm_constraint_t s_cnst;
26 lmm_constraint_t cnst_next = NULL;
27 lmm_element_t elem = NULL;
28 xbt_swag_t cnst_list = NULL;
29 xbt_swag_t var_list = NULL;
30 xbt_swag_t elem_list = NULL;
31 double min_usage = -1;
34 static s_xbt_swag_t cnst_to_update;
40 xbt_swag_init(&(cnst_to_update),
41 xbt_swag_offset(s_cnst, saturated_constraint_set_hookup));
43 var_list = &(sys->variable_set);
44 DEBUG1("Variable set : %d", xbt_swag_size(var_list));
45 xbt_swag_foreach(var, var_list) {
48 DEBUG1("Handling variable %p",var);
49 xbt_swag_insert(var, &(sys->saturated_variable_set));
50 for (i = 0; i < var->cnsts_number; i++) {
51 if (var->cnsts[i].value == 0.0)
54 if ((nb == var->cnsts_number) && (var->weight > 0.0)) {
55 DEBUG1("Err, finally, there is no need to take care of variable %p",var);
56 xbt_swag_remove(var, &(sys->saturated_variable_set));
59 if (var->weight <= 0.0) {
60 DEBUG1("Err, finally, there is no need to take care of variable %p",var);
61 xbt_swag_remove(var, &(sys->saturated_variable_set));
64 var_list = &(sys->saturated_variable_set);
66 cnst_list = &(sys->active_constraint_set);
67 DEBUG1("Active constraints : %d", xbt_swag_size(cnst_list));
68 xbt_swag_foreach(cnst, cnst_list) {
69 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
71 cnst_list = &(sys->saturated_constraint_set);
72 xbt_swag_foreach(cnst, cnst_list) {
73 cnst->remaining = cnst->bound;
77 DEBUG0("Fair bottleneck Initialized");
80 * Compute Usage and store the variables that reach the maximum.
83 if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
84 DEBUG0("Fair bottleneck done");
87 DEBUG1("******* Constraints to process: %d *******",
88 xbt_swag_size(cnst_list));
90 xbt_swag_foreach_safe(cnst, cnst_next, cnst_list) {
92 DEBUG1("Processing cnst %p ", cnst);
93 elem_list = &(cnst->element_set);
95 xbt_swag_foreach(elem, elem_list) {
96 if (elem->variable->weight <= 0)
98 if ((elem->value > 0) &&
99 xbt_swag_belongs(elem->variable, var_list))
102 DEBUG1("\tThere are %d variables", nb);
103 if (nb > 0 && !cnst->shared)
106 cnst->remaining = 0.0;
107 cnst->usage = cnst->remaining;
108 xbt_swag_remove(cnst, cnst_list);
111 cnst->usage = cnst->remaining / nb;
112 DEBUG3("\tConstraint Usage %p : %f with %d variables", cnst,
116 xbt_swag_foreach_safe(var, var_next, var_list) {
117 double min_inc = var->cnsts[0].constraint->usage /
119 for (i = 1; i < var->cnsts_number; i++) {
120 lmm_element_t elm = &var->cnsts[i];
121 min_inc = MIN(min_inc, elm->constraint->usage / elm->value);
124 min_inc = MIN(min_inc, var->bound - var->value);
126 DEBUG2("Updating variable %p maximum increment: %g", var, var->mu);
127 var->value += var->mu;
128 if (var->value == var->bound) {
129 xbt_swag_remove(var, var_list);
133 xbt_swag_foreach_safe(cnst, cnst_next, cnst_list) {
134 DEBUG1("Updating cnst %p ", cnst);
135 elem_list = &(cnst->element_set);
136 xbt_swag_foreach(elem, elem_list) {
137 if (elem->variable->weight <= 0)
140 DEBUG4("\tUpdate constraint %p (%g) with variable %p by %g",
141 cnst, cnst->remaining, elem->variable,
143 double_update(&(cnst->remaining),
144 elem->value * elem->variable->mu);
147 ("\tNon-Shared variable. Update constraint usage of %p (%g) with variable %p by %g",
148 cnst, cnst->usage, elem->variable, elem->variable->mu);
149 cnst->usage = MIN(cnst->usage, elem->value * elem->variable->mu);
153 DEBUG3("\tUpdate constraint %p (%g) by %g",
154 cnst, cnst->remaining, cnst->usage);
156 double_update(&(cnst->remaining), cnst->usage);
159 DEBUG2("\tRemaining for %p : %g", cnst, cnst->remaining);
160 if (cnst->remaining == 0.0) {
161 DEBUG1("\tGet rid of constraint %p", cnst);
163 xbt_swag_remove(cnst, cnst_list);
164 xbt_swag_foreach(elem, elem_list) {
165 if (elem->variable->weight <= 0)
167 if (elem->value > 0) {
168 DEBUG1("\t\tGet rid of variable %p", elem->variable);
169 xbt_swag_remove(elem->variable, var_list);
174 } while (xbt_swag_size(var_list));
176 xbt_swag_foreach_safe(cnst, cnst_next, cnst_list) {
177 xbt_swag_remove(cnst, cnst_list);
180 if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
181 DEBUG0("Fair bottleneck done");