src/surf/network_ib.cpp

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