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further rework the config handling. Still much to do
[simgrid.git] / 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 <algorithm>
8 #include <utility>
9
10 #include "network_ib.hpp"
11
12 #include "src/surf/HostImpl.hpp"
13 #include "simgrid/sg_config.h"
14 #include "maxmin_private.hpp"
15
16 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(surf_network);
17
18 static void IB_create_host_callback(simgrid::s4u::Host& host){
19   using namespace simgrid::surf;
20
21   static int id=0;
22   // pour t->id -> rajouter une nouvelle struct dans le dict, pour stocker les comms actives
23   if(((NetworkIBModel*)surf_network_model)->active_nodes==NULL)
24     ((NetworkIBModel*)surf_network_model)->active_nodes=xbt_dict_new();
25
26   IBNode* act = new IBNode(id);
27
28   id++;
29   xbt_dict_set(((NetworkIBModel*)surf_network_model)->active_nodes,
30       host.name().c_str(), act, NULL);
31
32 }
33
34 static void IB_action_state_changed_callback(
35     simgrid::surf::NetworkAction *action,
36     simgrid::surf::Action::State statein, simgrid::surf::Action::State stateout)
37 {
38   using namespace simgrid::surf;
39   if(statein!=simgrid::surf::Action::State::running || stateout!=simgrid::surf::Action::State::done)
40     return;
41   std::pair<IBNode*,IBNode*> pair = ((NetworkIBModel*)surf_network_model)->active_comms[action];
42   XBT_DEBUG("IB callback - action %p finished", action);
43
44   ((NetworkIBModel*)surf_network_model)->updateIBfactors(action, pair.first, pair.second, 1);
45
46   ((NetworkIBModel*)surf_network_model)->active_comms.erase(action);
47
48 }
49
50
51 static void IB_action_init_callback(
52     simgrid::surf::NetworkAction *action, simgrid::surf::NetCard *src, simgrid::surf::NetCard *dst)
53 {
54   simgrid::surf::NetworkIBModel* ibModel = (simgrid::surf::NetworkIBModel*)surf_network_model;
55
56   simgrid::surf::IBNode* act_src= (simgrid::surf::IBNode*) xbt_dict_get_or_null(ibModel->active_nodes, src->name());
57   xbt_assert(act_src, "could not find src node active comms !");
58
59   simgrid::surf::IBNode* act_dst= (simgrid::surf::IBNode*) xbt_dict_get_or_null(ibModel->active_nodes, dst->name());
60   xbt_assert(act_dst, "could not find dst node active comms !");
61
62   ibModel->active_comms[action]=std::make_pair(act_src, act_dst);
63
64   ibModel->updateIBfactors(action, act_src, act_dst, 0);
65 }
66
67 /*********
68  * Model *
69  *********/
70
71 /************************************************************************/
72 /* New model based on MPI contention model for Infiniband platforms */
73 /************************************************************************/
74 /* @Inproceedings{mescal_vienne_phd, */
75 /*  author={Jérôme Vienne}, */
76 /*  title={prédiction de performances d’applications de calcul haute performance sur réseau Infiniband}, */
77 /*  address={Grenoble FRANCE}, */
78 /*  month=june, */
79 /*  year={2010} */
80 /*  } */
81 void surf_network_model_init_IB(void)
82 {
83   using simgrid::surf::networkActionStateChangedCallbacks;
84
85   if (surf_network_model)
86     return;
87
88   surf_network_model = new simgrid::surf::NetworkIBModel();
89   xbt_dynar_push(all_existing_models, &surf_network_model);
90   networkActionStateChangedCallbacks.connect(IB_action_state_changed_callback);
91   Link::onCommunicate.connect(IB_action_init_callback);
92   simgrid::s4u::Host::onCreation.connect(IB_create_host_callback);
93   xbt_cfg_setdefault_double("network/weight_S", 8775);
94
95 }
96
97 #include "src/surf/xml/platf.hpp" // FIXME: move that back to the parsing area
98
99 namespace simgrid {
100   namespace surf {
101
102     NetworkIBModel::NetworkIBModel()
103     : NetworkSmpiModel() {
104       haveGap_=false;
105       active_nodes=NULL;
106
107       const char* IB_factors_string=sg_cfg_get_string("smpi/IB_penalty_factors");
108       xbt_dynar_t radical_elements = xbt_str_split(IB_factors_string, ";");
109
110       surf_parse_assert(xbt_dynar_length(radical_elements)==3,
111           "smpi/IB_penalty_factors should be provided and contain 3 elements, semi-colon separated : for example 0.965;0.925;1.35");
112
113       Be = xbt_str_parse_double(xbt_dynar_get_as(radical_elements, 0, char *), "First part of smpi/IB_penalty_factors is not numerical: %s");
114       Bs = xbt_str_parse_double(xbt_dynar_get_as(radical_elements, 1, char *), "Second part of smpi/IB_penalty_factors is not numerical: %s");
115       ys = xbt_str_parse_double(xbt_dynar_get_as(radical_elements, 2, char *), "Third part of smpi/IB_penalty_factors is not numerical: %s");
116
117       xbt_dynar_free(&radical_elements);
118     }
119
120     NetworkIBModel::~NetworkIBModel()
121     {
122       xbt_dict_cursor_t cursor = NULL;
123       IBNode* instance = NULL;
124       char *name = NULL;
125       xbt_dict_foreach(active_nodes, cursor, name, instance)
126       delete instance;
127       xbt_dict_free(&active_nodes);
128     }
129
130     void NetworkIBModel::computeIBfactors(IBNode *root) {
131       double penalized_bw=0.0;
132       double num_comm_out = (double) root->ActiveCommsUp.size();
133       double max_penalty_out=0.0;
134       //first, compute all outbound penalties to get their max
135       for (std::vector<ActiveComm*>::iterator it= root->ActiveCommsUp.begin(); it != root->ActiveCommsUp.end(); ++it) {
136         double my_penalty_out = 1.0;
137
138         if(num_comm_out!=1){
139           if((*it)->destination->nbActiveCommsDown > 2)//number of comms sent to the receiving node
140             my_penalty_out = num_comm_out * Bs * ys;
141           else
142             my_penalty_out = num_comm_out * Bs;
143         }
144
145         max_penalty_out = std::max(max_penalty_out,my_penalty_out);
146       }
147
148       for (std::vector<ActiveComm*>::iterator it= root->ActiveCommsUp.begin(); it != root->ActiveCommsUp.end(); ++it) {
149
150         //compute inbound penalty
151         double my_penalty_in = 1.0;
152         int nb_comms = (*it)->destination->nbActiveCommsDown;//total number of incoming comms
153         if(nb_comms!=1)
154           my_penalty_in = ((*it)->destination->ActiveCommsDown)[root] //number of comm sent to dest by root node
155                                                                 * Be
156                                                                 * (*it)->destination->ActiveCommsDown.size();//number of different nodes sending to dest
157
158         double penalty = std::max(my_penalty_in,max_penalty_out);
159
160         double rate_before_update = (*it)->action->getBound();
161         //save initial rate of the action
162         if((*it)->init_rate==-1)
163           (*it)->init_rate= rate_before_update;
164
165         penalized_bw= ! num_comm_out ? (*it)->init_rate : (*it)->init_rate /penalty;
166
167         if (!double_equals(penalized_bw, rate_before_update, sg_surf_precision)){
168           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 );
169           lmm_update_variable_bound(maxminSystem_, (*it)->action->getVariable(), penalized_bw);
170         }else{
171           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 );
172         }
173
174       }
175       XBT_DEBUG("Finished computing IB penalties");
176     }
177
178     void NetworkIBModel::updateIBfactors_rec(IBNode *root, bool* updatedlist) {
179       if(updatedlist[root->id]==0){
180         XBT_DEBUG("IB - Updating rec %d", root->id);
181         computeIBfactors(root);
182         updatedlist[root->id]=1;
183         for (std::vector<ActiveComm*>::iterator it= root->ActiveCommsUp.begin(); it != root->ActiveCommsUp.end(); ++it) {
184           if(updatedlist[(*it)->destination->id]!=1)
185             updateIBfactors_rec((*it)->destination, updatedlist);
186         }
187         for (std::map<IBNode*, int>::iterator it= root->ActiveCommsDown.begin(); it != root->ActiveCommsDown.end(); ++it) {
188           if(updatedlist[it->first->id]!=1)
189             updateIBfactors_rec(it->first, updatedlist);
190         }
191       }
192     }
193
194
195     void NetworkIBModel::updateIBfactors(NetworkAction *action, IBNode *from, IBNode * to, int remove) {
196       if (from == to)//disregard local comms (should use loopback)
197         return;
198
199       bool* updated=(bool*)xbt_malloc0(xbt_dict_size(active_nodes)*sizeof(bool));
200       ActiveComm* comm=NULL;
201       if(remove){
202         if(to->ActiveCommsDown[from]==1)
203           to->ActiveCommsDown.erase(from);
204         else
205           to->ActiveCommsDown[from]-=1;
206
207         to->nbActiveCommsDown--;
208         for (std::vector<ActiveComm*>::iterator it= from->ActiveCommsUp.begin();
209             it != from->ActiveCommsUp.end(); ++it) {
210           if((*it)->action==action){
211             comm=(*it);
212             from->ActiveCommsUp.erase(it);
213             break;
214           }
215         }
216         action->unref();
217
218       }else{
219         action->ref();
220         ActiveComm* comm=new ActiveComm();
221         comm->action=action;
222         comm->destination=to;
223         from->ActiveCommsUp.push_back(comm);
224
225         to->ActiveCommsDown[from]+=1;
226         to->nbActiveCommsDown++;
227       }
228       XBT_DEBUG("IB - Updating %d", from->id);
229       updateIBfactors_rec(from, updated);
230       XBT_DEBUG("IB - Finished updating %d", from->id);
231       if(comm)
232         delete comm;
233       xbt_free(updated);
234     }
235
236   }
237 }