1 /* Copyright (c) 2007-2021. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #include "src/kernel/lmm/maxmin.hpp"
7 #include "src/surf/surf_interface.hpp"
8 #include "xbt/sysdep.h"
14 #include <xbt/utility.hpp>
16 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(surf_maxmin);
18 void simgrid::kernel::lmm::FairBottleneck::bottleneck_solve()
23 XBT_DEBUG("Variable set : %zu", variable_set.size());
24 for (Variable& var : variable_set) {
26 XBT_DEBUG("Handling variable %p", &var);
27 if (var.sharing_penalty_ > 0.0 && std::find_if(begin(var.cnsts_), end(var.cnsts_), [](Element const& x) {
28 return x.consumption_weight != 0.0;
29 }) != end(var.cnsts_)) {
30 saturated_variable_set.push_back(var);
32 XBT_DEBUG("Err, finally, there is no need to take care of variable %p", &var);
33 if (var.sharing_penalty_ > 0.0)
38 XBT_DEBUG("Active constraints : %zu", active_constraint_set.size());
39 for (Constraint& cnst : active_constraint_set) {
40 saturated_constraint_set.push_back(cnst);
42 for (Constraint& cnst : saturated_constraint_set) {
43 cnst.remaining_ = cnst.bound_;
47 XBT_DEBUG("Fair bottleneck Initialized");
50 * Compute Usage and store the variables that reach the maximum.
52 auto& var_list = saturated_variable_set;
53 auto& cnst_list = saturated_constraint_set;
55 if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
56 XBT_DEBUG("Fair bottleneck done");
59 XBT_DEBUG("******* Constraints to process: %zu *******", cnst_list.size());
60 for (auto iter = std::begin(cnst_list); iter != std::end(cnst_list);) {
61 Constraint& cnst = *iter;
63 XBT_DEBUG("Processing cnst %p ", &cnst);
65 for (const Element& elem : cnst.enabled_element_set_) {
66 xbt_assert(elem.variable->sharing_penalty_ > 0);
67 if (elem.consumption_weight > 0 && elem.variable->saturated_variable_set_hook_.is_linked())
70 XBT_DEBUG("\tThere are %d variables", nb);
71 if (nb > 0 && cnst.sharing_policy_ == s4u::Link::SharingPolicy::FATPIPE)
74 cnst.remaining_ = 0.0;
76 iter = cnst_list.erase(iter);
78 cnst.usage_ = cnst.remaining_ / nb;
79 XBT_DEBUG("\tConstraint Usage %p : %f with %d variables", &cnst, cnst.usage_, nb);
84 for (auto iter = std::begin(var_list); iter != std::end(var_list);) {
85 Variable& var = *iter;
86 double min_inc = DBL_MAX;
87 for (Element const& elm : var.cnsts_) {
88 if (elm.consumption_weight > 0)
89 min_inc = std::min(min_inc, elm.constraint->usage_ / elm.consumption_weight);
92 min_inc = std::min(min_inc, var.bound_ - var.value_);
94 XBT_DEBUG("Updating variable %p maximum increment: %g", &var, var.mu_);
95 var.value_ += var.mu_;
96 if (var.value_ == var.bound_)
97 iter = var_list.erase(iter);
102 for (auto iter = std::begin(cnst_list); iter != std::end(cnst_list);) {
103 Constraint& cnst = *iter;
104 XBT_DEBUG("Updating cnst %p ", &cnst);
105 if (cnst.sharing_policy_ != s4u::Link::SharingPolicy::FATPIPE) {
106 for (const Element& elem : cnst.enabled_element_set_) {
107 xbt_assert(elem.variable->sharing_penalty_ > 0);
108 XBT_DEBUG("\tUpdate constraint %p (%g) with variable %p by %g", &cnst, cnst.remaining_, elem.variable,
110 double_update(&cnst.remaining_, elem.consumption_weight * elem.variable->mu_, sg_maxmin_precision);
113 for (const Element& elem : cnst.enabled_element_set_) {
114 xbt_assert(elem.variable->sharing_penalty_ > 0);
115 XBT_DEBUG("\tNon-Shared variable. Update constraint usage of %p (%g) with variable %p by %g", &cnst,
116 cnst.usage_, elem.variable, elem.variable->mu_);
117 cnst.usage_ = std::min(cnst.usage_, elem.consumption_weight * elem.variable->mu_);
119 XBT_DEBUG("\tUpdate constraint %p (%g) by %g", &cnst, cnst.remaining_, cnst.usage_);
120 double_update(&cnst.remaining_, cnst.usage_, sg_maxmin_precision);
123 XBT_DEBUG("\tRemaining for %p : %g", &cnst, cnst.remaining_);
124 if (cnst.remaining_ <= 0.0) {
125 XBT_DEBUG("\tGet rid of constraint %p", &cnst);
127 iter = cnst_list.erase(iter);
128 for (const Element& elem : cnst.enabled_element_set_) {
129 if (elem.variable->sharing_penalty_ <= 0)
131 if (elem.consumption_weight > 0 && elem.variable->saturated_variable_set_hook_.is_linked()) {
132 XBT_DEBUG("\t\tGet rid of variable %p", elem.variable);
133 simgrid::xbt::intrusive_erase(var_list, *elem.variable);
140 } while (not var_list.empty());
144 if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
145 XBT_DEBUG("Fair bottleneck done");