src/surf/cpu.c

   1 /* Authors: Arnaud Legrand                                                  */
   2
   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. */
   5
   6 #include "cpu_private.h"
   7 #include "xbt/dict.h"
   8
   9 surf_cpu_resource_t surf_cpu_resource = NULL;
  10 static xbt_dict_t cpu_set = NULL;
  11 static lmm_system_t sys = NULL;
  12
  13 /* power_scale is the basic power of the cpu when the cpu is
  14    completely available. initial_power is therefore expected to be
  15    comprised between 0.0 and 1.0, just as the values of power_trace.
  16    state_trace values mean SURF_CPU_ON if >0 and SURF_CPU_OFF
  17    otherwise.
  18 */
  19
  20 static void *new_cpu(const char *name, xbt_maxmin_float_t power_scale,
  21                       xbt_maxmin_float_t initial_power, tmgr_trace_t power_trace,
  22                       e_surf_cpu_state_t initial_state, tmgr_trace_t state_trace)
  23 {
  24   cpu_t cpu = xbt_new0(s_cpu_t,1);
  25
  26   cpu->name = name;
  27   cpu->power_scale = power_scale;
  28   cpu->current_power = initial_power;
  29   cpu->power_trace = power_trace;
  30   cpu->current_state = initial_state;
  31   cpu->state_trace = state_trace;
  32   cpu->constraint = lmm_constraint_new(sys, cpu, cpu->current_power * cpu->power_scale);
  33
  34   xbt_dict_set(cpu_set, name, cpu, NULL);
  35
  36   return cpu;
  37 }
  38
  39 static void parse_file(const char *file)
  40 {
  41   new_cpu("Cpu A", 20.0, 1.0, NULL, SURF_CPU_ON, NULL);
  42   new_cpu("Cpu B", 120.0, 1.0, NULL, SURF_CPU_ON, NULL);
  43 }
  44
  45 static void *name_service(const char *name)
  46 {
  47   void *cpu=NULL;
  48
  49   xbt_dict_get(cpu_set, name, &cpu);
  50
  51   return cpu;
  52 }
  53
  54 static const char *get_resource_name(void *resource_id)
  55 {
  56   return ((cpu_t) resource_id)->name;
  57 }
  58
  59 static int resource_used(void *resource_id)
  60 {
  61   return lmm_constraint_used(sys, ((cpu_t)resource_id)->constraint);
  62 }
  63
  64 static surf_action_t action_new(void *callback)
  65 {
  66   return NULL;
  67 }
  68
  69 static e_surf_action_state_t action_get_state(surf_action_t action)
  70 {
  71   return SURF_ACTION_NOT_IN_THE_SYSTEM;
  72 }
  73
  74 static void action_free(surf_action_t * action)
  75 {
  76   return;
  77 }
  78
  79 static void action_cancel(surf_action_t action)
  80 {
  81   return;
  82 }
  83
  84 static void action_recycle(surf_action_t action)
  85 {
  86   return;
  87 }
  88
  89 static void action_change_state(surf_action_t action, e_surf_action_state_t state)
  90 {
  91   surf_action_change_state(action, state);
  92   return;
  93 }
  94
  95 static xbt_heap_float_t share_resources()
  96 {
  97   surf_action_cpu_t action = NULL;
  98   xbt_swag_t running_actions= surf_cpu_resource->resource.states.running_action_set;
  99   xbt_maxmin_float_t min = -1;
 100   xbt_maxmin_float_t value = -1;
 101   lmm_solve(sys);
 102
 103   action = xbt_swag_getFirst(running_actions);
 104   if(!action) return 0.0;
 105   value = lmm_variable_getvalue(action->variable);
 106   min = action->generic_action.remains / value ;
 107
 108   xbt_swag_foreach(action,running_actions) {
 109     /* If everything is stable... */
 110     value = action->generic_action.remains /
 111       lmm_variable_getvalue(action->variable);
 112     if(value<min) min=value;
 113   }
 114
 115   return min;
 116 }
 117
 118 static void update_state(xbt_heap_float_t now,
 119                          xbt_heap_float_t delta)
 120 {
 121   surf_action_cpu_t action = NULL;
 122   surf_action_cpu_t next_action = NULL;
 123   xbt_swag_t running_actions= surf_cpu_resource->resource.states.running_action_set;
 124
 125   xbt_swag_foreach_safe(action, next_action, running_actions) {
 126     action->generic_action.remains -=
 127       lmm_variable_getvalue(action->variable)*delta;
 128 /*     if(action->generic_action.remains<.00001) action->generic_action.remains=0; */
 129     if(action->generic_action.remains<=0) {
 130       action_change_state((surf_action_t)action, SURF_ACTION_DONE);
 131     } /* else if(host_failed..) */
 132   }
 133
 134   return;
 135 }
 136
 137 static surf_action_t execute(void *cpu, xbt_maxmin_float_t size)
 138 {
 139   lmm_variable_t var;
 140   surf_action_cpu_t action = NULL;
 141
 142   action=xbt_new0(s_surf_action_cpu_t,1);
 143
 144   action->generic_action.cost=size;
 145   action->generic_action.remains=size;
 146   action->generic_action.start=-1.0;
 147   action->generic_action.finish=-1.0;
 148   action->generic_action.callback=cpu;
 149   action->generic_action.resource_type=(surf_resource_t)surf_cpu_resource;
 150
 151   action->generic_action.state_set=surf_cpu_resource->resource.states.running_action_set;
 152   xbt_swag_insert(action,action->generic_action.state_set);
 153
 154   action->variable = lmm_variable_new(sys, action, 1.0, -1.0, 1);
 155   lmm_expand(sys, ((cpu_t)cpu)->constraint, action->variable, 1.0);
 156
 157   return (surf_action_t) action;
 158 }
 159
 160 static e_surf_cpu_state_t get_state(void *cpu)
 161 {
 162   return SURF_CPU_OFF;
 163 }
 164
 165 static surf_cpu_resource_t surf_cpu_resource_init_internal(void)
 166 {
 167   s_surf_action_t action;
 168
 169   surf_cpu_resource = xbt_new0(s_surf_cpu_resource_t,1);
 170
 171   surf_cpu_resource->resource.states.ready_action_set=
 172     xbt_swag_new(xbt_swag_offset(action,state_hookup));
 173   surf_cpu_resource->resource.states.running_action_set=
 174     xbt_swag_new(xbt_swag_offset(action,state_hookup));
 175   surf_cpu_resource->resource.states.failed_action_set=
 176     xbt_swag_new(xbt_swag_offset(action,state_hookup));
 177   surf_cpu_resource->resource.states.done_action_set=
 178     xbt_swag_new(xbt_swag_offset(action,state_hookup));
 179
 180   surf_cpu_resource->resource.name_service = name_service;
 181   surf_cpu_resource->resource.get_resource_name = get_resource_name;
 182   surf_cpu_resource->resource.resource_used = resource_used;
 183   surf_cpu_resource->resource.action_get_state=surf_action_get_state;
 184   surf_cpu_resource->resource.action_free = action_free;
 185   surf_cpu_resource->resource.action_cancel = action_cancel;
 186   surf_cpu_resource->resource.action_recycle = action_recycle;
 187   surf_cpu_resource->resource.action_change_state = action_change_state;
 188   surf_cpu_resource->resource.share_resources = share_resources;
 189   surf_cpu_resource->resource.update_state = update_state;
 190
 191   surf_cpu_resource->execute = execute;
 192   surf_cpu_resource->get_state = get_state;
 193
 194   cpu_set = xbt_dict_new();
 195
 196   sys = lmm_system_new();
 197
 198   return surf_cpu_resource;
 199 }
 200
 201 void surf_cpu_resource_init(const char* filename)
 202 {
 203   surf_resource_t CPU = NULL;
 204
 205   surf_cpu_resource=surf_cpu_resource_init_internal();
 206   parse_file(filename);
 207   CPU = &(surf_cpu_resource->resource); /* to make short */
 208   xbt_dynar_push(resource_list, &CPU);
 209 }