src/surf/network_ib.cpp

   1 /* Copyright (c) 2014-2015. 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 #include "network_ib.hpp"
   8 #include "simgrid/sg_config.h"
   9 #include "maxmin_private.hpp"
  10 #include "src/surf/host_interface.hpp"
  11
  12 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(surf_network);
  13
  14 static void IB_create_host_callback(Host* host){
  15
  16   static int id=0;
  17 // pour t->id -> rajouter une nouvelle struct dans le dict, pour stocker les comms actives
  18   if(((NetworkIBModel*)surf_network_model)->active_nodes==NULL)
  19     ((NetworkIBModel*)surf_network_model)->active_nodes=xbt_dict_new();
  20
  21   IBNode* act = new IBNode(id);
  22
  23   id++;
  24   xbt_dict_set(((NetworkIBModel*)surf_network_model)->active_nodes,
  25     host->getName(), act, NULL);
  26
  27 }
  28
  29 static void IB_action_state_changed_callback(NetworkAction *action, e_surf_action_state_t statein, e_surf_action_state_t stateout){
  30  if(statein!=SURF_ACTION_RUNNING|| stateout!=SURF_ACTION_DONE)
  31     return;
  32   std::pair<IBNode*,IBNode*> pair = ((NetworkIBModel*)surf_network_model)->active_comms[action];
  33   XBT_DEBUG("IB callback - action %p finished", action);
  34
  35  ((NetworkIBModel*)surf_network_model)->updateIBfactors(action, pair.first, pair.second, 1);
  36
  37   ((NetworkIBModel*)surf_network_model)->active_comms.erase(action);
  38
  39 }
  40
  41
  42 static void IB_action_init_callback(NetworkAction *action,RoutingEdge *src, RoutingEdge *dst, double size, double rate){
  43   if(((NetworkIBModel*)surf_network_model)->active_nodes==NULL)
  44     xbt_die("IB comm added, without any node connected !");
  45
  46   IBNode* act_src= (IBNode*) xbt_dict_get_or_null(((NetworkIBModel*)surf_network_model)->active_nodes, src->getName());
  47   if(act_src==NULL)
  48     xbt_die("could not find src node active comms !");
  49   //act_src->rate=rate;
  50
  51   IBNode* act_dst= (IBNode*) xbt_dict_get_or_null(((NetworkIBModel*)surf_network_model)->active_nodes, dst->getName());
  52   if(act_dst==NULL)
  53     xbt_die("could not find dst node active comms !");
  54  // act_dst->rate=rate;
  55
  56   ((NetworkIBModel*)surf_network_model)->active_comms[action]=make_pair(act_src, act_dst);
  57   //post the action in the second dist, to retrieve in the other callback
  58   XBT_DEBUG("IB callback - action %p init", action);
  59
  60   ((NetworkIBModel*)surf_network_model)->updateIBfactors(action, act_src, act_dst, 0);
  61
  62 }
  63
  64
  65
  66 /*********
  67  * Model *
  68  *********/
  69
  70 /************************************************************************/
  71 /* New model based on MPI contention model for Infiniband platforms */
  72 /************************************************************************/
  73 /* @Inproceedings{mescal_vienne_phd, */
  74 /*  author={Jérôme Vienne}, */
  75 /*  title={prédiction de performances d’applications de calcul haute performance sur réseau Infiniband}, */
  76 /*  address={Grenoble FRANCE}, */
  77 /*  month=june, */
  78 /*  year={2010} */
  79 /*  } */
  80 void surf_network_model_init_IB(void)
  81 {
  82
  83   if (surf_network_model)
  84     return;
  85   surf_network_model = new NetworkIBModel();
  86   net_define_callbacks();
  87   xbt_dynar_push(all_existing_models, &surf_network_model);
  88   surf_callback_connect(networkActionStateChangedCallbacks, IB_action_state_changed_callback);
  89   surf_callback_connect(networkCommunicateCallbacks, IB_action_init_callback);
  90
  91   hostCreatedCallbacks.connect(IB_create_host_callback);
  92   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 8775);
  93
  94 }
  95
  96 NetworkIBModel::NetworkIBModel()
  97  : NetworkSmpiModel() {
  98   m_haveGap=false;
  99   active_nodes=NULL;
 100
 101   const char* IB_factors_string=sg_cfg_get_string("smpi/IB_penalty_factors");
 102   xbt_dynar_t radical_elements = xbt_str_split(IB_factors_string, ";");
 103
 104   if(xbt_dynar_length(radical_elements)!=3)
 105     surf_parse_error("smpi/IB_penalty_factors should be provided and contain 3 elements, semi-colon separated : for example 0.965;0.925;1.35");
 106
 107   Be = atof(xbt_dynar_get_as(radical_elements, 0, char *));
 108   Bs = atof(xbt_dynar_get_as(radical_elements, 1, char *));
 109   ys = atof(xbt_dynar_get_as(radical_elements, 2, char *));
 110
 111   xbt_dynar_free(&radical_elements);
 112 }
 113
 114 NetworkIBModel::~NetworkIBModel()
 115 {
 116   xbt_dict_cursor_t cursor = NULL;
 117   IBNode* instance = NULL;
 118   char *name = NULL;
 119   xbt_dict_foreach(active_nodes, cursor, name, instance)
 120     delete instance;
 121   xbt_dict_free(&active_nodes);
 122 }
 123
 124 void NetworkIBModel::computeIBfactors(IBNode *root) {
 125   double penalized_bw=0.0;
 126   double num_comm_out = (double) root->ActiveCommsUp.size();
 127   double max_penalty_out=0.0;
 128   //first, compute all outbound penalties to get their max
 129   for (std::vector<ActiveComm*>::iterator it= root->ActiveCommsUp.begin(); it != root->ActiveCommsUp.end(); ++it) {
 130     double my_penalty_out = 1.0;
 131
 132     if(num_comm_out!=1){
 133       if((*it)->destination->nbActiveCommsDown > 2)//number of comms sent to the receiving node
 134         my_penalty_out = num_comm_out * Bs * ys;
 135       else
 136         my_penalty_out = num_comm_out * Bs;
 137     }
 138
 139     max_penalty_out = max(max_penalty_out,my_penalty_out);
 140   }
 141
 142   for (std::vector<ActiveComm*>::iterator it= root->ActiveCommsUp.begin(); it != root->ActiveCommsUp.end(); ++it) {
 143
 144     //compute inbound penalty
 145     double my_penalty_in = 1.0;
 146     int nb_comms = (*it)->destination->nbActiveCommsDown;//total number of incoming comms
 147     if(nb_comms!=1)
 148       my_penalty_in = ((*it)->destination->ActiveCommsDown)[root] //number of comm sent to dest by root node
 149                       * Be
 150                       * (*it)->destination->ActiveCommsDown.size();//number of different nodes sending to dest
 151
 152     double penalty=max(my_penalty_in,max_penalty_out);
 153
 154     double rate_before_update = (*it)->action->getBound();
 155     //save initial rate of the action
 156     if((*it)->init_rate==-1)
 157       (*it)->init_rate= rate_before_update;
 158
 159     penalized_bw= ! num_comm_out ? (*it)->init_rate : (*it)->init_rate /penalty;
 160
 161     if (!double_equals(penalized_bw, rate_before_update, sg_surf_precision)){
 162       XBT_DEBUG("%d->%d action %p penalty updated : bw now %f, before %f , initial rate %f", root->id,(*it)->destination->id,(*it)->action,penalized_bw, (*it)->action->getBound(), (*it)->init_rate );
 163       lmm_update_variable_bound(p_maxminSystem, (*it)->action->getVariable(), penalized_bw);
 164     }else{
 165       XBT_DEBUG("%d->%d action %p penalty not updated : bw %f, initial rate %f", root->id,(*it)->destination->id,(*it)->action,penalized_bw, (*it)->init_rate );
 166     }
 167
 168   }
 169   XBT_DEBUG("Finished computing IB penalties");
 170 }
 171
 172 void NetworkIBModel::updateIBfactors_rec(IBNode *root, bool* updatedlist) {
 173   if(updatedlist[root->id]==0){
 174     XBT_DEBUG("IB - Updating rec %d", root->id);
 175     computeIBfactors(root);
 176     updatedlist[root->id]=1;
 177     for (std::vector<ActiveComm*>::iterator it= root->ActiveCommsUp.begin(); it != root->ActiveCommsUp.end(); ++it) {
 178         if(updatedlist[(*it)->destination->id]!=1)
 179           updateIBfactors_rec((*it)->destination, updatedlist);
 180     }
 181     for (std::map<IBNode*, int>::iterator it= root->ActiveCommsDown.begin(); it != root->ActiveCommsDown.end(); ++it) {
 182         if(updatedlist[it->first->id]!=1)
 183           updateIBfactors_rec(it->first, updatedlist);
 184     }
 185   }
 186 }
 187
 188
 189 void NetworkIBModel::updateIBfactors(NetworkAction *action, IBNode *from, IBNode * to, int remove) {
 190   if (from == to)//disregard local comms (should use loopback)
 191     return;
 192
 193   bool* updated=(bool*)xbt_malloc0(xbt_dict_size(active_nodes)*sizeof(bool));
 194   ActiveComm* comm=NULL;
 195   if(remove){
 196     if(to->ActiveCommsDown[from]==1)
 197       to->ActiveCommsDown.erase(from);
 198     else
 199       to->ActiveCommsDown[from]-=1;
 200
 201     to->nbActiveCommsDown--;
 202     for (std::vector<ActiveComm*>::iterator it= from->ActiveCommsUp.begin();
 203          it != from->ActiveCommsUp.end(); ++it) {
 204       if((*it)->action==action){
 205         comm=(*it);
 206         from->ActiveCommsUp.erase(it);
 207         break;
 208       }
 209     }
 210     action->unref();
 211
 212   }else{
 213     action->ref();
 214     ActiveComm* comm=new ActiveComm();
 215     comm->action=action;
 216     comm->destination=to;
 217     from->ActiveCommsUp.push_back(comm);
 218
 219     to->ActiveCommsDown[from]+=1;
 220     to->nbActiveCommsDown++;
 221   }
 222   XBT_DEBUG("IB - Updating %d", from->id);
 223   updateIBfactors_rec(from, updated);
 224   XBT_DEBUG("IB - Finished updating %d", from->id);
 225   if(comm)
 226     delete comm;
 227   xbt_free(updated);
 228 }