1 /* Copyright (c) 2007-2011, 2013-2017. 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. */
7 #include "surf/maxmin.hpp"
9 #include "xbt/sysdep.h"
15 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(surf_maxmin);
16 #define SHOW_EXPR_G(expr) XBT_DEBUG(#expr " = %g",expr);
17 #define SHOW_EXPR_D(expr) XBT_DEBUG(#expr " = %d",expr);
18 #define SHOW_EXPR_P(expr) XBT_DEBUG(#expr " = %p",expr);
20 void simgrid::surf::bottleneck_solve(lmm_system_t sys)
27 lmm_variable_t var = nullptr;
28 lmm_constraint_t cnst = nullptr;
29 s_lmm_constraint_t s_cnst;
30 lmm_element_t elem = nullptr;
31 xbt_swag_t cnst_list = nullptr;
32 xbt_swag_t var_list = nullptr;
33 xbt_swag_t elem_list = nullptr;
35 static s_xbt_swag_t cnst_to_update;
37 if (not sys->modified)
41 xbt_swag_init(&(cnst_to_update), xbt_swag_offset(s_cnst, saturated_constraint_set_hookup));
43 var_list = &(sys->variable_set);
44 XBT_DEBUG("Variable set : %d", xbt_swag_size(var_list));
45 xbt_swag_foreach(_var, var_list) {
46 var = static_cast<lmm_variable_t>(_var);
48 XBT_DEBUG("Handling variable %p", var);
49 xbt_swag_insert(var, &(sys->saturated_variable_set));
50 auto weighted = std::find_if(begin(var->cnsts), end(var->cnsts),
51 [](s_lmm_element_t const& x) { return x.consumption_weight != 0.0; });
52 if (weighted == end(var->cnsts) && var->sharing_weight > 0.0) {
53 XBT_DEBUG("Err, finally, there is no need to take care of variable %p", var);
54 xbt_swag_remove(var, &(sys->saturated_variable_set));
57 if (var->sharing_weight <= 0.0) {
58 XBT_DEBUG("Err, finally, there is no need to take care of variable %p", var);
59 xbt_swag_remove(var, &(sys->saturated_variable_set));
62 var_list = &(sys->saturated_variable_set);
64 cnst_list = &(sys->active_constraint_set);
65 XBT_DEBUG("Active constraints : %d", xbt_swag_size(cnst_list));
66 xbt_swag_foreach(_cnst, cnst_list) {
67 cnst = static_cast<lmm_constraint_t>(_cnst);
68 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
70 cnst_list = &(sys->saturated_constraint_set);
71 xbt_swag_foreach(_cnst, cnst_list) {
72 cnst = static_cast<lmm_constraint_t>(_cnst);
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 *******", xbt_swag_size(cnst_list));
88 xbt_swag_foreach_safe(_cnst, _cnst_next, cnst_list) {
89 cnst = static_cast<lmm_constraint_t>(_cnst);
91 XBT_DEBUG("Processing cnst %p ", cnst);
92 elem_list = &(cnst->enabled_element_set);
94 xbt_swag_foreach(_elem, elem_list) {
95 elem = static_cast<lmm_element_t>(_elem);
96 xbt_assert(elem->variable->sharing_weight > 0);
97 if ((elem->consumption_weight > 0) && xbt_swag_belongs(elem->variable, var_list))
100 XBT_DEBUG("\tThere are %d variables", nb);
101 if (nb > 0 && not cnst->sharing_policy)
104 cnst->remaining = 0.0;
105 cnst->usage = cnst->remaining;
106 xbt_swag_remove(cnst, cnst_list);
109 cnst->usage = cnst->remaining / nb;
110 XBT_DEBUG("\tConstraint Usage %p : %f with %d variables", cnst, cnst->usage, nb);
113 xbt_swag_foreach_safe(_var, _var_next, var_list) {
114 var = static_cast<lmm_variable_t>(_var);
115 double min_inc = DBL_MAX;
116 for (s_lmm_element_t const& elm : var->cnsts) {
117 if (elm.consumption_weight > 0)
118 min_inc = std::min(min_inc, elm.constraint->usage / elm.consumption_weight);
121 min_inc = std::min(min_inc, var->bound - var->value);
123 XBT_DEBUG("Updating variable %p maximum increment: %g", var, var->mu);
124 var->value += var->mu;
125 if (var->value == var->bound) {
126 xbt_swag_remove(var, var_list);
130 xbt_swag_foreach_safe(_cnst, _cnst_next, cnst_list) {
131 cnst = static_cast<lmm_constraint_t>(_cnst);
132 XBT_DEBUG("Updating cnst %p ", cnst);
133 elem_list = &(cnst->enabled_element_set);
134 xbt_swag_foreach(_elem, elem_list) {
135 elem = static_cast<lmm_element_t>(_elem);
136 xbt_assert(elem->variable->sharing_weight > 0);
137 if (cnst->sharing_policy) {
138 XBT_DEBUG("\tUpdate constraint %p (%g) with variable %p by %g", cnst, cnst->remaining, elem->variable,
140 double_update(&(cnst->remaining), elem->consumption_weight * elem->variable->mu, sg_maxmin_precision);
142 XBT_DEBUG("\tNon-Shared variable. Update constraint usage of %p (%g) with variable %p by %g",
143 cnst, cnst->usage, elem->variable, elem->variable->mu);
144 cnst->usage = std::min(cnst->usage, elem->consumption_weight * elem->variable->mu);
147 if (not cnst->sharing_policy) {
148 XBT_DEBUG("\tUpdate constraint %p (%g) by %g", cnst, cnst->remaining, cnst->usage);
150 double_update(&(cnst->remaining), cnst->usage, sg_maxmin_precision);
153 XBT_DEBUG("\tRemaining for %p : %g", cnst, cnst->remaining);
154 if (cnst->remaining <= 0.0) {
155 XBT_DEBUG("\tGet rid of constraint %p", cnst);
157 xbt_swag_remove(cnst, cnst_list);
158 xbt_swag_foreach(_elem, elem_list) {
159 elem = static_cast<lmm_element_t>(_elem);
160 if (elem->variable->sharing_weight <= 0)
162 if (elem->consumption_weight > 0) {
163 XBT_DEBUG("\t\tGet rid of variable %p", elem->variable);
164 xbt_swag_remove(elem->variable, var_list);
169 } while (xbt_swag_size(var_list));
171 xbt_swag_reset(cnst_list);
172 sys->modified = true;
173 if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
174 XBT_DEBUG("Fair bottleneck done");