X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/0a765af45e3af8e4aeb5ac528b9f4e7ac6ce777f..c3d32ba7bd6d22b8c5dbf4cd48e21233f97ce05e:/src/surf/maxmin.c

diff --git a/src/surf/maxmin.c b/src/surf/maxmin.c
index 0d0ddbac4f..a0315867b3 100644
--- a/src/surf/maxmin.c
+++ b/src/surf/maxmin.c
@@ -1,12 +1,17 @@
-/* Authors: Arnaud Legrand                                                  */
+/* 	$Id$	 */
+
+/* Copyright (c) 2004 Arnaud Legrand. All rights reserved.                  */
 
 /* This program is free software; you can redistribute it and/or modify it
-   under the terms of the license (GNU LGPL) which comes with this package. */
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
 
 #include "xbt/sysdep.h"
 #include "xbt/error.h"
 #include "maxmin_private.h"
 #include <stdlib.h>
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(maxmin, surf,
+				"Logging specific to the SURF maxmin module");
 
 lmm_system_t lmm_system_new(void)
 {
@@ -16,11 +21,20 @@ lmm_system_t lmm_system_new(void)
 
   l = xbt_new0(s_lmm_system_t, 1);
 
+  l->modified = 0;
   xbt_swag_init(&(l->variable_set),
 		xbt_swag_offset(var, variable_set_hookup));
   xbt_swag_init(&(l->constraint_set),
 		xbt_swag_offset(cnst, constraint_set_hookup));
 
+  xbt_swag_init(&(l->active_constraint_set),
+		xbt_swag_offset(cnst, active_constraint_set_hookup));
+
+  xbt_swag_init(&(l->saturated_variable_set),
+		xbt_swag_offset(var, saturated_variable_set_hookup));
+  xbt_swag_init(&(l->saturated_constraint_set),
+		xbt_swag_offset(cnst, saturated_constraint_set_hookup));
+
   return l;
 }
 
@@ -30,47 +44,62 @@ void lmm_system_free(lmm_system_t sys)
   lmm_constraint_t cnst = NULL;
 
   while ((var = extract_variable(sys)))
-    lmm_var_free(var);
+    lmm_var_free(sys, var);
 
   while ((cnst = extract_constraint(sys)))
-    lmm_cnst_free(cnst);
+    lmm_cnst_free(sys, cnst);
 
   xbt_free(sys);
 }
 
-static void lmm_var_free(lmm_variable_t var)
+void lmm_variable_disable(lmm_system_t sys, lmm_variable_t var)
 {
   int i;
   lmm_element_t elem = NULL;
 
+  sys->modified = 1;
+
   for (i = 0; i < var->cnsts_number; i++) {
     elem = &var->cnsts[i];
-    xbt_swag_extract(elem, &(elem->constraint->element_set));
+    xbt_swag_remove(elem, &(elem->constraint->element_set));
+    if (!xbt_swag_size(&(elem->constraint->element_set)))
+      make_constraint_inactive(sys, elem->constraint);
   }
+  var->cnsts_number = 0;
+}
+
+static void lmm_var_free(lmm_system_t sys, lmm_variable_t var)
+{
+
+  lmm_variable_disable(sys, var);
+
   xbt_free(var->cnsts);
   xbt_free(var);
 }
 
-static void lmm_cnst_free(lmm_constraint_t cnst)
+static void lmm_cnst_free(lmm_system_t sys, lmm_constraint_t cnst)
 {
-/*   xbt_assert0(xbt_fifo_size(&(cnst->row)), */
-/* 		 "This list should be empty!"); */
+/*   xbt_assert0(xbt_swag_size(&(cnst->element_set)), */
+/* 	      "This list should be empty!"); */
+  remove_active_constraint(sys, cnst);
   xbt_free(cnst);
 }
 
-lmm_constraint_t lmm_constraint_new(lmm_system_t sys,	/* void *id, */
-				    FLOAT bound_value)
+lmm_constraint_t lmm_constraint_new(lmm_system_t sys, void *id,
+				    double bound_value)
 {
   lmm_constraint_t cnst = NULL;
   s_lmm_element_t elem;
 
   cnst = xbt_new0(s_lmm_constraint_t, 1);
-/*   cnst->id = id; */
+  cnst->id = id;
   xbt_swag_init(&(cnst->element_set),
 		xbt_swag_offset(elem, element_set_hookup));
+  xbt_swag_init(&(cnst->active_element_set),
+		xbt_swag_offset(elem, active_element_set_hookup));
 
   cnst->bound = bound_value;
-  cnst->usage = UNUSED_CONSTRAINT;
+  cnst->usage = 0;
   insert_constraint(sys, cnst);
 
   return cnst;
@@ -79,24 +108,25 @@ lmm_constraint_t lmm_constraint_new(lmm_system_t sys,	/* void *id, */
 void lmm_constraint_free(lmm_system_t sys, lmm_constraint_t cnst)
 {
   remove_constraint(sys, cnst);
-  lmm_cnst_free(cnst);
+  lmm_cnst_free(sys, cnst);
 }
 
-lmm_variable_t lmm_variable_new(lmm_system_t sys,	/* void *id, */
-				FLOAT weight_value, FLOAT bound,
-				int number_of_constraints)
+lmm_variable_t lmm_variable_new(lmm_system_t sys, void *id,
+				double weight,
+				double bound, int number_of_constraints)
 {
   lmm_variable_t var = NULL;
 
   var = xbt_new0(s_lmm_variable_t, 1);
-/*   var->id = id; */
+  var->id = id;
   var->cnsts = xbt_new0(s_lmm_element_t, number_of_constraints);
   var->cnsts_size = number_of_constraints;
   /* var->cnsts_number = 0; *//* Useless because of the calloc  */
-  var->weight_value = weight_value;
+  var->weight = weight;
   var->bound = bound;
-  var->value = -1;
-  insert_variable(sys, var);
+  var->value = 0.0;
+  if(weight) xbt_swag_insert_at_head(var,&(sys->variable_set));
+  else xbt_swag_insert_at_tail(var,&(sys->variable_set));
 
   return var;
 }
@@ -104,36 +134,276 @@ lmm_variable_t lmm_variable_new(lmm_system_t sys,	/* void *id, */
 void lmm_variable_free(lmm_system_t sys, lmm_variable_t var)
 {
   remove_variable(sys, var);
-  lmm_var_free(var);
+  lmm_var_free(sys, var);
+}
+
+double lmm_variable_getvalue(lmm_variable_t var)
+{
+  return (var->value);
 }
 
-void lmm_add_constraint(lmm_system_t sys, lmm_constraint_t cnst,
-			lmm_variable_t var, FLOAT value)
+void lmm_expand(lmm_system_t sys, lmm_constraint_t cnst,
+		lmm_variable_t var, double value)
 {
   lmm_element_t elem = NULL;
 
-/*   xbt_assert0(var->cnsts_number<var->cnsts_size,"Too much constraint"); */
+  sys->modified = 1;
+
+  xbt_assert0(var->cnsts_number < var->cnsts_size,
+	      "Too much constraints");
 
   elem = &(var->cnsts[var->cnsts_number++]);
 
   elem->value = value;
   elem->constraint = cnst;
+  elem->variable = var;
+
+  if(var->weight) xbt_swag_insert_at_head(elem,&(elem->constraint->element_set));
+  else xbt_swag_insert_at_tail(elem,&(elem->constraint->element_set));
+
+  make_constraint_active(sys, cnst);
+}
+
+lmm_constraint_t lmm_get_cnst_from_var(lmm_system_t sys,
+				       lmm_variable_t var, int num)
+{
+  if (num < var->cnsts_number)
+    return (var->cnsts[num].constraint);
+  else
+    return NULL;
+}
+
+int lmm_get_number_of_cnst_from_var(lmm_system_t sys, lmm_variable_t var)
+{
+  return (var->cnsts_number);
+}
+
+lmm_variable_t lmm_get_var_from_cnst(lmm_system_t sys,
+				     lmm_constraint_t cnst,
+				     lmm_variable_t * var)
+{
+  if (!(*var))
+    xbt_swag_getFirst(&(cnst->element_set));
+  else
+    *var = xbt_swag_getNext(*var, cnst->element_set.offset);
+  return *var;
+}
+
+void *lmm_constraint_id(lmm_constraint_t cnst)
+{
+  return cnst->id;
+}
+
+void *lmm_variable_id(lmm_variable_t var)
+{
+  return var->id;
+}
+
+static void saturated_constraint_set_update(lmm_system_t sys,
+					    lmm_constraint_t cnst,
+					    double *min_usage)
+{
+  lmm_constraint_t useless_cnst = NULL;
+
+  if (cnst->usage <= 0)
+    return;
+  if (cnst->remaining <= 0)
+    return;
+  if ((*min_usage < 0) || (*min_usage > cnst->remaining / cnst->usage)) {
+    *min_usage = cnst->remaining / cnst->usage;
+
+    while ((useless_cnst =
+	    xbt_swag_getFirst(&(sys->saturated_constraint_set))))
+      xbt_swag_remove(useless_cnst, &(sys->saturated_constraint_set));
+
+    xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
+  } else if (*min_usage == cnst->remaining / cnst->usage) {
+    xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
+  }
+}
 
-  insert_elem_in_constraint(elem);
+static void saturated_variable_set_update(lmm_system_t sys)
+{
+  lmm_constraint_t cnst = NULL;
+  xbt_swag_t cnst_list = NULL;
+  lmm_element_t elem = NULL;
+  xbt_swag_t elem_list = NULL;
+
+  cnst_list = &(sys->saturated_constraint_set);
+  while ((cnst = xbt_swag_getFirst(cnst_list))) {
+    elem_list = &(cnst->active_element_set);
+    xbt_swag_foreach(elem, elem_list) {
+      if(elem->variable->weight<=0) break;
+      if ((elem->value > 0))
+	xbt_swag_insert(elem->variable, &(sys->saturated_variable_set));
+    }
+    xbt_swag_remove(cnst, cnst_list);
+  }
 
 }
 
 void lmm_solve(lmm_system_t sys)
 {
-  void **id_table = NULL;
+  lmm_variable_t var = NULL;
+  lmm_constraint_t cnst = NULL;
+  lmm_element_t elem = NULL;
+  xbt_swag_t cnst_list = NULL;
+  xbt_swag_t var_list = NULL;
+  xbt_swag_t elem_list = NULL;
+  double min_usage = -1;
+
+  if (!(sys->modified))
+    return;
+
+  /* Init */
+  var_list = &(sys->variable_set);
+  xbt_swag_foreach(var, var_list) {
+    var->value = 0.0;
+  }
+
 
   /* Compute Usage and store the variables that reach the maximum */
 
+  cnst_list = &(sys->active_constraint_set);
+  xbt_swag_foreach(cnst, cnst_list) {
+    /* INIT */
+    elem_list = &(cnst->element_set);
+    cnst->remaining = cnst->bound;
+    cnst->usage = 0;
+    xbt_swag_foreach(elem, elem_list) {
+      if(elem->variable->weight <=0) break;
+      if ((elem->value > 0)) {
+	cnst->usage += elem->value / elem->variable->weight;
+	insert_active_elem_in_constraint(elem);
+      }
+    }
+
+    /* Saturated constraints update */
+    saturated_constraint_set_update(sys, cnst, &min_usage);
+  }
+
+  saturated_variable_set_update(sys);
+
+  /* Saturated variables update */
+
   do {
     /* Fix the variables that have to be */
+    var_list = &(sys->saturated_variable_set);
+
+
+    xbt_swag_foreach(var, var_list) {
+      /* First check if some of these variables have reach their upper
+         bound and update min_usage accordingly. */
+      if ((var->bound > 0) && (var->bound / var->weight < min_usage)) {
+	min_usage = var->bound / var->weight;
+      }
+    }
+
+
+    while ((var = xbt_swag_getFirst(var_list))) {
+      int i;
+
+      var->value = min_usage / var->weight;
+
+      /* Update usage */
 
-    /* Update Usage and store the variables that reach the maximum */
+      for (i = 0; i < var->cnsts_number; i++) {
+	elem = &var->cnsts[i];
+	cnst = elem->constraint;
+	cnst->remaining -= elem->value * var->value;
+	cnst->usage -= elem->value / var->weight;
+	remove_active_elem_in_constraint(elem);
+      }
+      xbt_swag_remove(var, var_list);
+    }
 
-  } while (1);
+    /* Find out which variables reach the maximum */
+    cnst_list = &(sys->active_constraint_set);
+    min_usage = -1;
+    xbt_swag_foreach(cnst, cnst_list) {
+      saturated_constraint_set_update(sys, cnst, &min_usage);
+    }
+    saturated_variable_set_update(sys);
 
+  } while (xbt_swag_size(&(sys->saturated_variable_set)));
+
+  sys->modified = 0;
+}
+
+/* Not a O(1) function */
+
+void lmm_update(lmm_system_t sys, lmm_constraint_t cnst,
+		lmm_variable_t var, double value)
+{
+  int i;
+
+  sys->modified = 1;
+  for (i = 0; i < var->cnsts_number; i++)
+    if (var->cnsts[i].constraint == cnst) {
+      var->cnsts[i].value = value;
+      return;
+    }
+}
+
+void lmm_update_variable_bound(lmm_system_t sys, lmm_variable_t var,
+			       double bound)
+{
+  sys->modified = 1;
+  var->bound = bound;
 }
+
+void lmm_update_variable_weight(lmm_system_t sys, lmm_variable_t var,
+				double weight)
+{
+  sys->modified = 1;
+  var->weight = weight;
+  xbt_swag_remove(var,&(sys->variable_set));
+  if(weight) xbt_swag_insert_at_head(var,&(sys->variable_set));
+  else xbt_swag_insert_at_tail(var,&(sys->variable_set));
+}
+
+
+double lmm_get_variable_weight(lmm_variable_t var)
+				  
+{
+  return var->weight;
+}
+
+void lmm_update_constraint_bound(lmm_system_t sys, lmm_constraint_t cnst,
+				 double bound)
+{
+  sys->modified = 1;
+  cnst->bound = bound;
+}
+
+int lmm_constraint_used(lmm_system_t sys, lmm_constraint_t cnst)
+{
+  return xbt_swag_belongs(cnst, &(sys->active_constraint_set));
+}
+
+lmm_constraint_t lmm_get_first_active_constraint(lmm_system_t sys)
+{
+  return xbt_swag_getFirst(&(sys->active_constraint_set));
+}
+
+lmm_constraint_t lmm_get_next_active_constraint(lmm_system_t sys, lmm_constraint_t cnst)
+{
+  return xbt_swag_getNext(cnst,(sys->active_constraint_set).offset);
+}
+
+
+/* void lmm_print(lmm_system_t sys) */
+/* { */
+/*   lmm_variable_t var = NULL; */
+/*   lmm_constraint_t cnst = NULL; */
+/*   lmm_element_t elem = NULL; */
+/*   xbt_swag_t cnst_list = NULL; */
+/*   xbt_swag_t var_list = NULL; */
+/*   xbt_swag_t elem_list = NULL; */
+
+/*   var_list = &(sys->variable_set); */
+/*   xbt_swag_foreach(var, var_list) { */
+/*     printf("%s : {\n",var->id); */
+/*     printf("\t %s : {\n",var->id); */
+/*   } */
+/* } */