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)
47 var = static_cast<lmm_variable_t>(_var);
49 XBT_DEBUG("Handling variable %p", var);
50 xbt_swag_insert(var, &(sys->saturated_variable_set));
51 auto weighted = std::find_if(begin(var->cnsts), end(var->cnsts),
52 [](s_lmm_element_t const& x) { return x.consumption_weight != 0.0; });
53 if (weighted == end(var->cnsts) && var->sharing_weight > 0.0) {
54 XBT_DEBUG("Err, finally, there is no need to take care of variable %p", var);
55 xbt_swag_remove(var, &(sys->saturated_variable_set));
58 if (var->sharing_weight <= 0.0) {
59 XBT_DEBUG("Err, finally, there is no need to take care of variable %p", var);
60 xbt_swag_remove(var, &(sys->saturated_variable_set));
63 var_list = &(sys->saturated_variable_set);
65 cnst_list = &(sys->active_constraint_set);
66 XBT_DEBUG("Active constraints : %d", xbt_swag_size(cnst_list));
67 xbt_swag_foreach(_cnst, cnst_list)
69 cnst = static_cast<lmm_constraint_t>(_cnst);
70 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
72 cnst_list = &(sys->saturated_constraint_set);
73 xbt_swag_foreach(_cnst, cnst_list)
75 cnst = static_cast<lmm_constraint_t>(_cnst);
76 cnst->remaining = cnst->bound;
80 XBT_DEBUG("Fair bottleneck Initialized");
83 * Compute Usage and store the variables that reach the maximum.
86 if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
87 XBT_DEBUG("Fair bottleneck done");
90 XBT_DEBUG("******* Constraints to process: %d *******", xbt_swag_size(cnst_list));
91 xbt_swag_foreach_safe(_cnst, _cnst_next, cnst_list)
93 cnst = static_cast<lmm_constraint_t>(_cnst);
95 XBT_DEBUG("Processing cnst %p ", cnst);
96 elem_list = &(cnst->enabled_element_set);
98 xbt_swag_foreach(_elem, elem_list)
100 elem = static_cast<lmm_element_t>(_elem);
101 xbt_assert(elem->variable->sharing_weight > 0);
102 if ((elem->consumption_weight > 0) && xbt_swag_belongs(elem->variable, var_list))
105 XBT_DEBUG("\tThere are %d variables", nb);
106 if (nb > 0 && not cnst->sharing_policy)
109 cnst->remaining = 0.0;
110 cnst->usage = cnst->remaining;
111 xbt_swag_remove(cnst, cnst_list);
114 cnst->usage = cnst->remaining / nb;
115 XBT_DEBUG("\tConstraint Usage %p : %f with %d variables", cnst, cnst->usage, nb);
118 xbt_swag_foreach_safe(_var, _var_next, var_list)
120 var = static_cast<lmm_variable_t>(_var);
121 double min_inc = DBL_MAX;
122 for (s_lmm_element_t const& elm : var->cnsts) {
123 if (elm.consumption_weight > 0)
124 min_inc = std::min(min_inc, elm.constraint->usage / elm.consumption_weight);
127 min_inc = std::min(min_inc, var->bound - var->value);
129 XBT_DEBUG("Updating variable %p maximum increment: %g", var, var->mu);
130 var->value += var->mu;
131 if (var->value == var->bound) {
132 xbt_swag_remove(var, var_list);
136 xbt_swag_foreach_safe(_cnst, _cnst_next, cnst_list)
138 cnst = static_cast<lmm_constraint_t>(_cnst);
139 XBT_DEBUG("Updating cnst %p ", cnst);
140 elem_list = &(cnst->enabled_element_set);
141 xbt_swag_foreach(_elem, elem_list)
143 elem = static_cast<lmm_element_t>(_elem);
144 xbt_assert(elem->variable->sharing_weight > 0);
145 if (cnst->sharing_policy) {
146 XBT_DEBUG("\tUpdate constraint %p (%g) with variable %p by %g", cnst, cnst->remaining, elem->variable,
148 double_update(&(cnst->remaining), elem->consumption_weight * elem->variable->mu, sg_maxmin_precision);
150 XBT_DEBUG("\tNon-Shared variable. Update constraint usage of %p (%g) with variable %p by %g", cnst,
151 cnst->usage, elem->variable, elem->variable->mu);
152 cnst->usage = std::min(cnst->usage, elem->consumption_weight * elem->variable->mu);
155 if (not cnst->sharing_policy) {
156 XBT_DEBUG("\tUpdate constraint %p (%g) by %g", cnst, cnst->remaining, cnst->usage);
158 double_update(&(cnst->remaining), cnst->usage, sg_maxmin_precision);
161 XBT_DEBUG("\tRemaining for %p : %g", cnst, cnst->remaining);
162 if (cnst->remaining <= 0.0) {
163 XBT_DEBUG("\tGet rid of constraint %p", cnst);
165 xbt_swag_remove(cnst, cnst_list);
166 xbt_swag_foreach(_elem, elem_list)
168 elem = static_cast<lmm_element_t>(_elem);
169 if (elem->variable->sharing_weight <= 0)
171 if (elem->consumption_weight > 0) {
172 XBT_DEBUG("\t\tGet rid of variable %p", elem->variable);
173 xbt_swag_remove(elem->variable, var_list);
178 } while (xbt_swag_size(var_list));
180 xbt_swag_reset(cnst_list);
181 sys->modified = true;
182 if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
183 XBT_DEBUG("Fair bottleneck done");