1 /* Copyright (c) 2007, 2008, 2009, 2010. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
8 #include "xbt/sysdep.h"
10 #include "maxmin_private.h"
14 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(surf_maxmin);
15 #define SHOW_EXPR_G(expr) XBT_DEBUG(#expr " = %g",expr);
16 #define SHOW_EXPR_D(expr) XBT_DEBUG(#expr " = %d",expr);
17 #define SHOW_EXPR_P(expr) XBT_DEBUG(#expr " = %p",expr);
19 void bottleneck_solve(lmm_system_t sys)
21 lmm_variable_t var = NULL;
22 lmm_variable_t var_next = NULL;
23 lmm_constraint_t cnst = NULL;
24 s_lmm_constraint_t s_cnst;
25 lmm_constraint_t cnst_next = NULL;
26 lmm_element_t elem = NULL;
27 xbt_swag_t cnst_list = NULL;
28 xbt_swag_t var_list = NULL;
29 xbt_swag_t elem_list = NULL;
32 static s_xbt_swag_t cnst_to_update;
38 xbt_swag_init(&(cnst_to_update),
39 xbt_swag_offset(s_cnst, saturated_constraint_set_hookup));
41 var_list = &(sys->variable_set);
42 XBT_DEBUG("Variable set : %d", xbt_swag_size(var_list));
43 xbt_swag_foreach(var, var_list) {
46 XBT_DEBUG("Handling variable %p", var);
47 xbt_swag_insert(var, &(sys->saturated_variable_set));
48 for (i = 0; i < var->cnsts_number; i++) {
49 if (var->cnsts[i].value == 0.0)
52 if ((nb == var->cnsts_number) && (var->weight > 0.0)) {
53 XBT_DEBUG("Err, finally, there is no need to take care of variable %p",
55 xbt_swag_remove(var, &(sys->saturated_variable_set));
58 if (var->weight <= 0.0) {
59 XBT_DEBUG("Err, finally, there is no need to take care of variable %p",
61 xbt_swag_remove(var, &(sys->saturated_variable_set));
64 var_list = &(sys->saturated_variable_set);
66 cnst_list = &(sys->active_constraint_set);
67 XBT_DEBUG("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 XBT_DEBUG("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 XBT_DEBUG("Fair bottleneck done");
87 XBT_DEBUG("******* Constraints to process: %d *******",
88 xbt_swag_size(cnst_list));
89 xbt_swag_foreach_safe(cnst, cnst_next, cnst_list) {
91 XBT_DEBUG("Processing cnst %p ", cnst);
92 elem_list = &(cnst->element_set);
94 xbt_swag_foreach(elem, elem_list) {
95 if (elem->variable->weight <= 0)
98 && xbt_swag_belongs(elem->variable, var_list))
101 XBT_DEBUG("\tThere are %d variables", nb);
102 if (nb > 0 && !cnst->shared)
105 cnst->remaining = 0.0;
106 cnst->usage = cnst->remaining;
107 xbt_swag_remove(cnst, cnst_list);
110 cnst->usage = cnst->remaining / nb;
111 XBT_DEBUG("\tConstraint Usage %p : %f with %d variables", cnst,
115 xbt_swag_foreach_safe(var, var_next, var_list) {
117 var->cnsts[0].constraint->usage / var->cnsts[0].value;
118 for (i = 1; i < var->cnsts_number; i++) {
119 lmm_element_t elm = &var->cnsts[i];
120 min_inc = MIN(min_inc, elm->constraint->usage / elm->value);
123 min_inc = MIN(min_inc, var->bound - var->value);
125 XBT_DEBUG("Updating variable %p maximum increment: %g", var, var->mu);
126 var->value += var->mu;
127 if (var->value == var->bound) {
128 xbt_swag_remove(var, var_list);
132 xbt_swag_foreach_safe(cnst, cnst_next, cnst_list) {
133 XBT_DEBUG("Updating cnst %p ", cnst);
134 elem_list = &(cnst->element_set);
135 xbt_swag_foreach(elem, elem_list) {
136 if (elem->variable->weight <= 0)
139 XBT_DEBUG("\tUpdate constraint %p (%g) with variable %p by %g",
140 cnst, cnst->remaining, elem->variable,
142 double_update(&(cnst->remaining),
143 elem->value * elem->variable->mu);
146 ("\tNon-Shared variable. Update constraint usage of %p (%g) with variable %p by %g",
147 cnst, cnst->usage, elem->variable, elem->variable->mu);
148 cnst->usage = MIN(cnst->usage, elem->value * elem->variable->mu);
152 XBT_DEBUG("\tUpdate constraint %p (%g) by %g",
153 cnst, cnst->remaining, cnst->usage);
155 double_update(&(cnst->remaining), cnst->usage);
158 XBT_DEBUG("\tRemaining for %p : %g", cnst, cnst->remaining);
159 if (cnst->remaining == 0.0) {
160 XBT_DEBUG("\tGet rid of constraint %p", cnst);
162 xbt_swag_remove(cnst, cnst_list);
163 xbt_swag_foreach(elem, elem_list) {
164 if (elem->variable->weight <= 0)
166 if (elem->value > 0) {
167 XBT_DEBUG("\t\tGet rid of variable %p", elem->variable);
168 xbt_swag_remove(elem->variable, var_list);
173 } while (xbt_swag_size(var_list));
175 xbt_swag_reset(cnst_list);
177 if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
178 XBT_DEBUG("Fair bottleneck done");