1 /* Copyright (c) 2007-2018. 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"
8 #include "xbt/sysdep.h"
13 #include <xbt/utility.hpp>
15 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(surf_maxmin);
17 simgrid::kernel::lmm::System* simgrid::kernel::lmm::make_new_fair_bottleneck_system(bool selective_update)
19 return new simgrid::kernel::lmm::FairBottleneck(selective_update);
22 void simgrid::kernel::lmm::FairBottleneck::bottleneck_solve()
27 XBT_DEBUG("Variable set : %zu", variable_set.size());
28 for (Variable& var : variable_set) {
30 XBT_DEBUG("Handling variable %p", &var);
31 if (var.sharing_weight > 0.0 && std::find_if(begin(var.cnsts), end(var.cnsts), [](Element const& x) {
32 return x.consumption_weight != 0.0;
33 }) != end(var.cnsts)) {
34 saturated_variable_set.push_back(var);
36 XBT_DEBUG("Err, finally, there is no need to take care of variable %p", &var);
37 if (var.sharing_weight > 0.0)
42 XBT_DEBUG("Active constraints : %zu", active_constraint_set.size());
43 for (Constraint& cnst : active_constraint_set) {
44 saturated_constraint_set.push_back(cnst);
46 for (Constraint& cnst : saturated_constraint_set) {
47 cnst.remaining = cnst.bound;
51 XBT_DEBUG("Fair bottleneck Initialized");
54 * Compute Usage and store the variables that reach the maximum.
56 auto& var_list = saturated_variable_set;
57 auto& cnst_list = saturated_constraint_set;
59 if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
60 XBT_DEBUG("Fair bottleneck done");
63 XBT_DEBUG("******* Constraints to process: %zu *******", cnst_list.size());
64 for (auto iter = std::begin(cnst_list); iter != std::end(cnst_list);) {
65 Constraint& cnst = *iter;
67 XBT_DEBUG("Processing cnst %p ", &cnst);
69 for (Element& elem : cnst.enabled_element_set) {
70 xbt_assert(elem.variable->sharing_weight > 0);
71 if (elem.consumption_weight > 0 && elem.variable->saturated_variable_set_hook.is_linked())
74 XBT_DEBUG("\tThere are %d variables", nb);
75 if (nb > 0 && not cnst.sharing_policy)
80 iter = cnst_list.erase(iter);
82 cnst.usage = cnst.remaining / nb;
83 XBT_DEBUG("\tConstraint Usage %p : %f with %d variables", &cnst, cnst.usage, nb);
88 for (auto iter = std::begin(var_list); iter != std::end(var_list);) {
89 Variable& var = *iter;
90 double min_inc = DBL_MAX;
91 for (Element const& elm : var.cnsts) {
92 if (elm.consumption_weight > 0)
93 min_inc = std::min(min_inc, elm.constraint->usage / elm.consumption_weight);
96 min_inc = std::min(min_inc, var.bound - var.value);
98 XBT_DEBUG("Updating variable %p maximum increment: %g", &var, var.mu);
100 if (var.value == var.bound)
101 iter = var_list.erase(iter);
106 for (auto iter = std::begin(cnst_list); iter != std::end(cnst_list);) {
107 Constraint& cnst = *iter;
108 XBT_DEBUG("Updating cnst %p ", &cnst);
109 if (cnst.sharing_policy) {
110 for (Element& elem : cnst.enabled_element_set) {
111 xbt_assert(elem.variable->sharing_weight > 0);
112 XBT_DEBUG("\tUpdate constraint %p (%g) with variable %p by %g", &cnst, cnst.remaining, elem.variable,
114 double_update(&cnst.remaining, elem.consumption_weight * elem.variable->mu, sg_maxmin_precision);
117 for (Element& elem : cnst.enabled_element_set) {
118 xbt_assert(elem.variable->sharing_weight > 0);
119 XBT_DEBUG("\tNon-Shared variable. Update constraint usage of %p (%g) with variable %p by %g", &cnst,
120 cnst.usage, elem.variable, elem.variable->mu);
121 cnst.usage = std::min(cnst.usage, elem.consumption_weight * elem.variable->mu);
123 XBT_DEBUG("\tUpdate constraint %p (%g) by %g", &cnst, cnst.remaining, cnst.usage);
124 double_update(&cnst.remaining, cnst.usage, sg_maxmin_precision);
127 XBT_DEBUG("\tRemaining for %p : %g", &cnst, cnst.remaining);
128 if (cnst.remaining <= 0.0) {
129 XBT_DEBUG("\tGet rid of constraint %p", &cnst);
131 iter = cnst_list.erase(iter);
132 for (Element& elem : cnst.enabled_element_set) {
133 if (elem.variable->sharing_weight <= 0)
135 if (elem.consumption_weight > 0 && elem.variable->saturated_variable_set_hook.is_linked()) {
136 XBT_DEBUG("\t\tGet rid of variable %p", elem.variable);
137 simgrid::xbt::intrusive_erase(var_list, *elem.variable);
144 } while (not var_list.empty());
148 if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
149 XBT_DEBUG("Fair bottleneck done");