src/surf/surf_routing_vivaldi.c

   1 /* Copyright (c) 2009, 2010, 2011. 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 #include "surf_routing_private.h"
   7
   8 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_route_vivaldi, surf, "Routing part of surf");
   9
  10 /* Routing model structure */
  11
  12 typedef struct {
  13   s_routing_component_t generic_routing;
  14   xbt_dict_t dict_processing_units;
  15   xbt_dict_t dict_autonomous_systems;
  16 } s_routing_component_vivaldi_t, *routing_component_vivaldi_t;
  17
  18 /* Parse routing model functions */
  19
  20 static route_extended_t vivaldi_get_route(routing_component_t rc,
  21                                             const char *src,
  22                                             const char *dst);
  23
  24 /* Business methods */
  25 static route_extended_t vivaldi_get_route(routing_component_t rc,
  26                                             const char *src,
  27                                             const char *dst)
  28 {
  29           xbt_assert(rc && src
  30                       && dst,
  31                       "Invalid params for \"get_route\" function at AS \"%s\"",
  32                       rc->name);
  33
  34           route_extended_t new_e_route = xbt_new0(s_route_extended_t, 1);
  35           new_e_route->src_gateway = ROUTER_PEER(src);
  36           new_e_route->dst_gateway = ROUTER_PEER(dst);
  37           new_e_route->generic_route.link_list =  xbt_dynar_new(0, NULL);
  38           return new_e_route;
  39 }
  40
  41 static double euclidean_dist_comp(int index, xbt_dynar_t src, xbt_dynar_t dst)
  42 {
  43         double src_coord, dst_coord;
  44
  45         src_coord = atof(xbt_dynar_get_as(src, index, char *));
  46         dst_coord = atof(xbt_dynar_get_as(dst, index, char *));
  47
  48         return (src_coord-dst_coord)*(src_coord-dst_coord);
  49
  50 }
  51
  52 static double base_vivaldi_get_latency (const char *src, const char *dst)
  53 {
  54   double euclidean_dist;
  55   xbt_dynar_t src_ctn, dst_ctn;
  56   src_ctn = xbt_lib_get_or_null(host_lib, src, COORD_HOST_LEVEL);
  57   if(!src_ctn) src_ctn = xbt_lib_get_or_null(as_router_lib, src, COORD_ASR_LEVEL);
  58   dst_ctn = xbt_lib_get_or_null(host_lib, dst, COORD_HOST_LEVEL);
  59   if(!dst_ctn) dst_ctn = xbt_lib_get_or_null(as_router_lib, dst, COORD_ASR_LEVEL);
  60
  61   if(dst_ctn == NULL || src_ctn == NULL)
  62   xbt_die("Coord src '%s' :%p   dst '%s' :%p",src,src_ctn,dst,dst_ctn);
  63
  64   euclidean_dist = sqrt (euclidean_dist_comp(0,src_ctn,dst_ctn)+euclidean_dist_comp(1,src_ctn,dst_ctn))
  65                                  + fabs(atof(xbt_dynar_get_as(src_ctn, 2, char *)))+fabs(atof(xbt_dynar_get_as(dst_ctn, 2, char *)));
  66
  67   xbt_assert(euclidean_dist>=0, "Euclidean Dist is less than 0\"%s\" and \"%.2f\"", src, euclidean_dist);
  68
  69   //From .ms to .s
  70   return euclidean_dist / 1000;
  71 }
  72
  73 static double vivaldi_get_link_latency (routing_component_t rc,const char *src, const char *dst, route_extended_t e_route)
  74 {
  75   if(get_network_element_type(src) == SURF_NETWORK_ELEMENT_AS) {
  76           int need_to_clean = e_route?0:1;
  77           double latency;
  78           e_route = e_route?e_route:(*(rc->get_route)) (rc, src, dst);
  79           latency = base_vivaldi_get_latency(e_route->src_gateway,e_route->dst_gateway);
  80           if(need_to_clean) generic_free_extended_route(e_route);
  81           return latency;
  82   } else {
  83           return base_vivaldi_get_latency(src,dst);
  84   }
  85 }
  86
  87 /* Creation routing model functions */
  88 void *model_vivaldi_create(void)
  89 {
  90           routing_component_vivaldi_t new_component = model_none_create();
  91           new_component->generic_routing.get_route = vivaldi_get_route;
  92           new_component->generic_routing.get_latency = vivaldi_get_link_latency;
  93           return new_component;
  94 }