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);
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::kernel::lmm::bottleneck_solve(lmm::System* sys)
22 if (not sys->modified)
25 XBT_DEBUG("Variable set : %zu", sys->variable_set.size());
26 for (Variable& var : sys->variable_set) {
28 XBT_DEBUG("Handling variable %p", &var);
29 if (var.sharing_weight > 0.0 && std::find_if(begin(var.cnsts), end(var.cnsts), [](Element const& x) {
30 return x.consumption_weight != 0.0;
31 }) != end(var.cnsts)) {
32 sys->saturated_variable_set.push_back(var);
34 XBT_DEBUG("Err, finally, there is no need to take care of variable %p", &var);
35 if (var.sharing_weight > 0.0)
40 XBT_DEBUG("Active constraints : %zu", sys->active_constraint_set.size());
41 for (Constraint& cnst : sys->active_constraint_set) {
42 sys->saturated_constraint_set.push_back(cnst);
44 for (Constraint& cnst : sys->saturated_constraint_set) {
45 cnst.remaining = cnst.bound;
49 XBT_DEBUG("Fair bottleneck Initialized");
52 * Compute Usage and store the variables that reach the maximum.
54 auto& var_list = sys->saturated_variable_set;
55 auto& cnst_list = sys->saturated_constraint_set;
57 if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
58 XBT_DEBUG("Fair bottleneck done");
61 XBT_DEBUG("******* Constraints to process: %zu *******", cnst_list.size());
62 for (auto iter = std::begin(cnst_list); iter != std::end(cnst_list);) {
63 Constraint& cnst = *iter;
65 XBT_DEBUG("Processing cnst %p ", &cnst);
67 for (Element& elem : cnst.enabled_element_set) {
68 xbt_assert(elem.variable->sharing_weight > 0);
69 if (elem.consumption_weight > 0 && elem.variable->saturated_variable_set_hook.is_linked())
72 XBT_DEBUG("\tThere are %d variables", nb);
73 if (nb > 0 && not cnst.sharing_policy)
78 iter = cnst_list.erase(iter);
80 cnst.usage = cnst.remaining / nb;
81 XBT_DEBUG("\tConstraint Usage %p : %f with %d variables", &cnst, cnst.usage, nb);
86 for (auto iter = std::begin(var_list); iter != std::end(var_list);) {
87 Variable& var = *iter;
88 double min_inc = DBL_MAX;
89 for (Element const& elm : var.cnsts) {
90 if (elm.consumption_weight > 0)
91 min_inc = std::min(min_inc, elm.constraint->usage / elm.consumption_weight);
94 min_inc = std::min(min_inc, var.bound - var.value);
96 XBT_DEBUG("Updating variable %p maximum increment: %g", &var, var.mu);
98 if (var.value == var.bound)
99 iter = var_list.erase(iter);
104 for (auto iter = std::begin(cnst_list); iter != std::end(cnst_list);) {
105 Constraint& cnst = *iter;
106 XBT_DEBUG("Updating cnst %p ", &cnst);
107 if (cnst.sharing_policy) {
108 for (Element& elem : cnst.enabled_element_set) {
109 xbt_assert(elem.variable->sharing_weight > 0);
110 XBT_DEBUG("\tUpdate constraint %p (%g) with variable %p by %g", &cnst, cnst.remaining, elem.variable,
112 double_update(&cnst.remaining, elem.consumption_weight * elem.variable->mu, sg_maxmin_precision);
115 for (Element& elem : cnst.enabled_element_set) {
116 xbt_assert(elem.variable->sharing_weight > 0);
117 XBT_DEBUG("\tNon-Shared variable. Update constraint usage of %p (%g) with variable %p by %g", &cnst,
118 cnst.usage, elem.variable, elem.variable->mu);
119 cnst.usage = std::min(cnst.usage, elem.consumption_weight * elem.variable->mu);
121 XBT_DEBUG("\tUpdate constraint %p (%g) by %g", &cnst, cnst.remaining, cnst.usage);
122 double_update(&cnst.remaining, cnst.usage, sg_maxmin_precision);
125 XBT_DEBUG("\tRemaining for %p : %g", &cnst, cnst.remaining);
126 if (cnst.remaining <= 0.0) {
127 XBT_DEBUG("\tGet rid of constraint %p", &cnst);
129 iter = cnst_list.erase(iter);
130 for (Element& elem : cnst.enabled_element_set) {
131 if (elem.variable->sharing_weight <= 0)
133 if (elem.consumption_weight > 0 && elem.variable->saturated_variable_set_hook.is_linked()) {
134 XBT_DEBUG("\t\tGet rid of variable %p", elem.variable);
135 simgrid::xbt::intrusive_erase(var_list, *elem.variable);
142 } while (not var_list.empty());
145 sys->modified = true;
146 if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
147 XBT_DEBUG("Fair bottleneck done");