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 "src/kernel/lmm/maxmin.hpp"
9 #include "xbt/sysdep.h"
14 #include <xbt/utility.hpp>
16 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(surf_maxmin);
17 #define SHOW_EXPR_G(expr) XBT_DEBUG(#expr " = %g", expr);
18 #define SHOW_EXPR_D(expr) XBT_DEBUG(#expr " = %d", expr);
19 #define SHOW_EXPR_P(expr) XBT_DEBUG(#expr " = %p", expr);
21 void simgrid::kernel::lmm::bottleneck_solve(lmm_system_t sys)
23 if (not sys->modified)
26 XBT_DEBUG("Variable set : %zu", sys->variable_set.size());
27 for (Variable& var : sys->variable_set) {
29 XBT_DEBUG("Handling variable %p", &var);
30 if (var.sharing_weight > 0.0 && std::find_if(begin(var.cnsts), end(var.cnsts), [](Element const& x) {
31 return x.consumption_weight != 0.0;
32 }) != end(var.cnsts)) {
33 sys->saturated_variable_set.push_back(var);
35 XBT_DEBUG("Err, finally, there is no need to take care of variable %p", &var);
36 if (var.sharing_weight > 0.0)
41 XBT_DEBUG("Active constraints : %zu", sys->active_constraint_set.size());
42 for (Constraint& cnst : sys->active_constraint_set) {
43 sys->saturated_constraint_set.push_back(cnst);
45 for (Constraint& cnst : sys->saturated_constraint_set) {
46 cnst.remaining = cnst.bound;
50 XBT_DEBUG("Fair bottleneck Initialized");
53 * Compute Usage and store the variables that reach the maximum.
55 auto& var_list = sys->saturated_variable_set;
56 auto& cnst_list = sys->saturated_constraint_set;
58 if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
59 XBT_DEBUG("Fair bottleneck done");
62 XBT_DEBUG("******* Constraints to process: %zu *******", cnst_list.size());
63 for (auto iter = std::begin(cnst_list); iter != std::end(cnst_list);) {
64 Constraint& cnst = *iter;
66 XBT_DEBUG("Processing cnst %p ", &cnst);
68 for (Element& elem : cnst.enabled_element_set) {
69 xbt_assert(elem.variable->sharing_weight > 0);
70 if (elem.consumption_weight > 0 && elem.variable->saturated_variable_set_hook.is_linked())
73 XBT_DEBUG("\tThere are %d variables", nb);
74 if (nb > 0 && not cnst.sharing_policy)
79 iter = cnst_list.erase(iter);
81 cnst.usage = cnst.remaining / nb;
82 XBT_DEBUG("\tConstraint Usage %p : %f with %d variables", &cnst, cnst.usage, nb);
87 for (auto iter = std::begin(var_list); iter != std::end(var_list);) {
88 Variable& var = *iter;
89 double min_inc = DBL_MAX;
90 for (Element const& elm : var.cnsts) {
91 if (elm.consumption_weight > 0)
92 min_inc = std::min(min_inc, elm.constraint->usage / elm.consumption_weight);
95 min_inc = std::min(min_inc, var.bound - var.value);
97 XBT_DEBUG("Updating variable %p maximum increment: %g", &var, var.mu);
99 if (var.value == var.bound)
100 iter = var_list.erase(iter);
105 for (auto iter = std::begin(cnst_list); iter != std::end(cnst_list);) {
106 Constraint& cnst = *iter;
107 XBT_DEBUG("Updating cnst %p ", &cnst);
108 if (cnst.sharing_policy) {
109 for (Element& elem : cnst.enabled_element_set) {
110 xbt_assert(elem.variable->sharing_weight > 0);
111 XBT_DEBUG("\tUpdate constraint %p (%g) with variable %p by %g", &cnst, cnst.remaining, elem.variable,
113 double_update(&cnst.remaining, elem.consumption_weight * elem.variable->mu, sg_maxmin_precision);
116 for (Element& elem : cnst.enabled_element_set) {
117 xbt_assert(elem.variable->sharing_weight > 0);
118 XBT_DEBUG("\tNon-Shared variable. Update constraint usage of %p (%g) with variable %p by %g", &cnst,
119 cnst.usage, elem.variable, elem.variable->mu);
120 cnst.usage = std::min(cnst.usage, elem.consumption_weight * elem.variable->mu);
122 XBT_DEBUG("\tUpdate constraint %p (%g) by %g", &cnst, cnst.remaining, cnst.usage);
123 double_update(&cnst.remaining, cnst.usage, sg_maxmin_precision);
126 XBT_DEBUG("\tRemaining for %p : %g", &cnst, cnst.remaining);
127 if (cnst.remaining <= 0.0) {
128 XBT_DEBUG("\tGet rid of constraint %p", &cnst);
130 iter = cnst_list.erase(iter);
131 for (Element& elem : cnst.enabled_element_set) {
132 if (elem.variable->sharing_weight <= 0)
134 if (elem.consumption_weight > 0 && elem.variable->saturated_variable_set_hook.is_linked()) {
135 XBT_DEBUG("\t\tGet rid of variable %p", elem.variable);
136 simgrid::xbt::intrusive_erase(var_list, *elem.variable);
143 } while (not var_list.empty());
146 sys->modified = true;
147 if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
148 XBT_DEBUG("Fair bottleneck done");