src/include/surf/maxmin.h

   1 /* Copyright (c) 2004-2013. The SimGrid Team.
   2  * All rights reserved.                                                     */
   3
   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. */
   6
   7 #ifndef _SURF_MAXMIN_H
   8 #define _SURF_MAXMIN_H
   9
  10 #include "portable.h"
  11 #include "xbt/misc.h"
  12 #include "surf/datatypes.h"
  13 #include <math.h>
  14
  15 extern double sg_maxmin_precision;
  16 #define MAXMIN_PRECISION sg_maxmin_precision
  17 static XBT_INLINE void double_update(double *variable, double value)
  18 {
  19   *variable -= value;
  20   if (*variable < MAXMIN_PRECISION)
  21     *variable = 0.0;
  22 }
  23
  24 static XBT_INLINE int double_positive(double value)
  25 {
  26   return (value > MAXMIN_PRECISION);
  27 }
  28
  29 static XBT_INLINE int double_equals(double value1, double value2)
  30 {
  31   return (fabs(value1 - value2) < MAXMIN_PRECISION);
  32 }
  33
  34 XBT_PUBLIC(lmm_system_t) lmm_system_new(int selective_update);
  35 XBT_PUBLIC(void) lmm_system_free(lmm_system_t sys);
  36
  37 XBT_PUBLIC(lmm_constraint_t) lmm_constraint_new(lmm_system_t sys, void *id,
  38                                                 double bound_value);
  39 void lmm_constraint_shared(lmm_constraint_t cnst);
  40 int lmm_constraint_is_shared(lmm_constraint_t cnst);
  41
  42 void lmm_constraint_free(lmm_system_t sys, lmm_constraint_t cnst);
  43
  44 double lmm_constraint_get_usage(lmm_constraint_t cnst);
  45
  46 XBT_PUBLIC(lmm_variable_t) lmm_variable_new(lmm_system_t sys, void *id,
  47                                             double weight_value,
  48                                             double bound,
  49                                             int number_of_constraints);
  50 XBT_PUBLIC(void) lmm_variable_free(lmm_system_t sys, lmm_variable_t var);
  51 XBT_PUBLIC(double) lmm_variable_getvalue(lmm_variable_t var);
  52 XBT_PUBLIC(double) lmm_variable_getbound(lmm_variable_t var);
  53
  54 XBT_PUBLIC(void) lmm_expand(lmm_system_t sys, lmm_constraint_t cnst,
  55                             lmm_variable_t var, double value);
  56 void lmm_expand_add(lmm_system_t sys, lmm_constraint_t cnst,
  57                     lmm_variable_t var, double value);
  58 void lmm_elem_set_value(lmm_system_t sys, lmm_constraint_t cnst,
  59                         lmm_variable_t var, double value);
  60
  61 lmm_constraint_t lmm_get_cnst_from_var(lmm_system_t sys,
  62                                        lmm_variable_t var, int num);
  63 double lmm_get_cnst_weight_from_var(lmm_system_t sys, lmm_variable_t var,
  64                                     int num);
  65 int lmm_get_number_of_cnst_from_var(lmm_system_t sys, lmm_variable_t var);
  66 lmm_variable_t lmm_get_var_from_cnst(lmm_system_t sys,
  67                                      lmm_constraint_t cnst,
  68                                      lmm_element_t * elem);
  69
  70 lmm_constraint_t lmm_get_first_active_constraint(lmm_system_t sys);
  71 lmm_constraint_t lmm_get_next_active_constraint(lmm_system_t sys,
  72                                                 lmm_constraint_t cnst);
  73 #ifdef HAVE_LATENCY_BOUND_TRACKING
  74 XBT_PUBLIC(int) lmm_is_variable_limited_by_latency(lmm_variable_t var);
  75 #endif
  76
  77 void *lmm_constraint_id(lmm_constraint_t cnst);
  78 void *lmm_variable_id(lmm_variable_t var);
  79
  80 void lmm_update(lmm_system_t sys, lmm_constraint_t cnst,
  81                 lmm_variable_t var, double value);
  82 void lmm_update_variable_bound(lmm_system_t sys, lmm_variable_t var,
  83                                double bound);
  84
  85
  86 XBT_PUBLIC(void) lmm_update_variable_weight(lmm_system_t sys,
  87                                             lmm_variable_t var,
  88                                             double weight);
  89 double lmm_get_variable_weight(lmm_variable_t var);
  90
  91 XBT_PUBLIC(void) lmm_update_constraint_bound(lmm_system_t sys,
  92                                              lmm_constraint_t cnst,
  93                                              double bound);
  94
  95 int lmm_constraint_used(lmm_system_t sys, lmm_constraint_t cnst);
  96
  97
  98 XBT_PUBLIC(void) lmm_solve(lmm_system_t sys);
  99
 100 XBT_PUBLIC(void) lagrange_solve(lmm_system_t sys);
 101 XBT_PUBLIC(void) bottleneck_solve(lmm_system_t sys);
 102
 103 /**
 104  * Default functions associated to the chosen protocol. When
 105  * using the lagrangian approach.
 106  */
 107
 108 XBT_PUBLIC(void) lmm_set_default_protocol_function(double (*func_f)
 109                                                     (lmm_variable_t var,
 110                                                      double x),
 111                                                    double (*func_fp)
 112                                                     (lmm_variable_t var,
 113                                                      double x),
 114                                                    double (*func_fpi)
 115                                                     (lmm_variable_t var,
 116                                                      double x));
 117
 118 XBT_PUBLIC(double func_reno_f) (lmm_variable_t var, double x);
 119 XBT_PUBLIC(double func_reno_fp) (lmm_variable_t var, double x);
 120 XBT_PUBLIC(double func_reno_fpi) (lmm_variable_t var, double x);
 121
 122 XBT_PUBLIC(double func_reno2_f) (lmm_variable_t var, double x);
 123 XBT_PUBLIC(double func_reno2_fp) (lmm_variable_t var, double x);
 124 XBT_PUBLIC(double func_reno2_fpi) (lmm_variable_t var, double x);
 125
 126 XBT_PUBLIC(double func_vegas_f) (lmm_variable_t var, double x);
 127 XBT_PUBLIC(double func_vegas_fp) (lmm_variable_t var, double x);
 128 XBT_PUBLIC(double func_vegas_fpi) (lmm_variable_t var, double x);
 129
 130
 131 #endif                          /* _SURF_MAXMIN_H */