Logo AND Algorithmique Numérique Distribuée

Public GIT Repository
943acb8f9e28c9b3cddb2c9c6ccf30e50a9023b3
[simgrid.git] / src / surf / network_cm02.cpp
1 /* Copyright (c) 2013-2017. The SimGrid Team. All rights reserved.          */
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 <algorithm>
7
8 #include "maxmin_private.hpp"
9 #include "network_cm02.hpp"
10 #include "simgrid/s4u/Host.hpp"
11 #include "simgrid/sg_config.h"
12 #include "src/instr/instr_private.hpp" // TRACE_is_enabled(). FIXME: remove by subscribing tracing to the surf signals
13
14 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(surf_network);
15
16 double sg_latency_factor = 1.0; /* default value; can be set by model or from command line */
17 double sg_bandwidth_factor = 1.0;       /* default value; can be set by model or from command line */
18 double sg_weight_S_parameter = 0.0;     /* default value; can be set by model or from command line */
19
20 double sg_tcp_gamma = 0.0;
21 int sg_network_crosstraffic = 0;
22
23 /************************************************************************/
24 /* New model based on optimizations discussed during Pedro Velho's thesis*/
25 /************************************************************************/
26 /* @techreport{VELHO:2011:HAL-00646896:1, */
27 /*      url = {http://hal.inria.fr/hal-00646896/en/}, */
28 /*      title = {{Flow-level network models: have we reached the limits?}}, */
29 /*      author = {Velho, Pedro and Schnorr, Lucas and Casanova, Henri and Legrand, Arnaud}, */
30 /*      type = {Rapport de recherche}, */
31 /*      institution = {INRIA}, */
32 /*      number = {RR-7821}, */
33 /*      year = {2011}, */
34 /*      month = Nov, */
35 /*      pdf = {http://hal.inria.fr/hal-00646896/PDF/rr-validity.pdf}, */
36 /*  } */
37 void surf_network_model_init_LegrandVelho()
38 {
39   if (surf_network_model)
40     return;
41
42   surf_network_model = new simgrid::surf::NetworkCm02Model();
43   all_existing_models->push_back(surf_network_model);
44
45   xbt_cfg_setdefault_double("network/latency-factor",      13.01);
46   xbt_cfg_setdefault_double("network/bandwidth-factor",     0.97);
47   xbt_cfg_setdefault_double("network/weight-S",         20537);
48 }
49
50 /***************************************************************************/
51 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
52 /***************************************************************************/
53 /* @TechReport{      rr-lip2002-40, */
54 /*   author        = {Henri Casanova and Loris Marchal}, */
55 /*   institution   = {LIP}, */
56 /*   title         = {A Network Model for Simulation of Grid Application}, */
57 /*   number        = {2002-40}, */
58 /*   month         = {oct}, */
59 /*   year          = {2002} */
60 /* } */
61 void surf_network_model_init_CM02()
62 {
63
64   if (surf_network_model)
65     return;
66
67   xbt_cfg_setdefault_double("network/latency-factor",   1.0);
68   xbt_cfg_setdefault_double("network/bandwidth-factor", 1.0);
69   xbt_cfg_setdefault_double("network/weight-S",         0.0);
70
71   surf_network_model = new simgrid::surf::NetworkCm02Model();
72   all_existing_models->push_back(surf_network_model);
73 }
74
75 /***************************************************************************/
76 /* The models from Steven H. Low                                           */
77 /***************************************************************************/
78 /* @article{Low03,                                                         */
79 /*   author={Steven H. Low},                                               */
80 /*   title={A Duality Model of {TCP} and Queue Management Algorithms},     */
81 /*   year={2003},                                                          */
82 /*   journal={{IEEE/ACM} Transactions on Networking},                      */
83 /*    volume={11}, number={4},                                             */
84 /*  }                                                                      */
85 void surf_network_model_init_Reno()
86 {
87   if (surf_network_model)
88     return;
89
90   lmm_set_default_protocol_function(func_reno_f, func_reno_fp, func_reno_fpi);
91
92   xbt_cfg_setdefault_double("network/latency-factor", 13.01);
93   xbt_cfg_setdefault_double("network/bandwidth-factor", 0.97);
94   xbt_cfg_setdefault_double("network/weight-S", 20537);
95
96   surf_network_model = new simgrid::surf::NetworkCm02Model(&lagrange_solve);
97   all_existing_models->push_back(surf_network_model);
98 }
99
100
101 void surf_network_model_init_Reno2()
102 {
103   if (surf_network_model)
104     return;
105
106   lmm_set_default_protocol_function(func_reno2_f, func_reno2_fp, func_reno2_fpi);
107
108   xbt_cfg_setdefault_double("network/latency-factor", 13.01);
109   xbt_cfg_setdefault_double("network/bandwidth-factor", 0.97);
110   xbt_cfg_setdefault_double("network/weight-S", 20537);
111
112   surf_network_model = new simgrid::surf::NetworkCm02Model(&lagrange_solve);
113   all_existing_models->push_back(surf_network_model);
114 }
115
116 void surf_network_model_init_Vegas()
117 {
118   if (surf_network_model)
119     return;
120
121   lmm_set_default_protocol_function(func_vegas_f, func_vegas_fp, func_vegas_fpi);
122
123   xbt_cfg_setdefault_double("network/latency-factor", 13.01);
124   xbt_cfg_setdefault_double("network/bandwidth-factor", 0.97);
125   xbt_cfg_setdefault_double("network/weight-S", 20537);
126
127   surf_network_model = new simgrid::surf::NetworkCm02Model(&lagrange_solve);
128   all_existing_models->push_back(surf_network_model);
129 }
130
131 namespace simgrid {
132 namespace surf {
133
134 NetworkCm02Model::NetworkCm02Model()
135   :NetworkModel()
136 {
137   std::string optim = xbt_cfg_get_string("network/optim");
138   bool select = xbt_cfg_get_boolean("network/maxmin-selective-update");
139
140   if (optim == "Full") {
141     setUpdateMechanism(UM_FULL);
142     selectiveUpdate_ = select;
143   } else if (optim == "Lazy") {
144     setUpdateMechanism(UM_LAZY);
145     selectiveUpdate_ = true;
146     xbt_assert(select || (xbt_cfg_is_default_value("network/maxmin-selective-update")),
147                "You cannot disable selective update when using the lazy update mechanism");
148   } else {
149     xbt_die("Unsupported optimization (%s) for this model. Accepted: Full, Lazy.", optim.c_str());
150   }
151
152   maxminSystem_ = lmm_system_new(selectiveUpdate_);
153   loopback_     = NetworkCm02Model::createLink("__loopback__", 498000000, 0.000015, SURF_LINK_FATPIPE);
154
155   if (getUpdateMechanism() == UM_LAZY) {
156     modifiedSet_ = new ActionLmmList();
157     maxminSystem_->keep_track = modifiedSet_;
158   }
159 }
160 NetworkCm02Model::NetworkCm02Model(void (*specificSolveFun)(lmm_system_t self))
161   : NetworkCm02Model()
162 {
163   maxminSystem_->solve_fun = specificSolveFun;
164 }
165
166 LinkImpl* NetworkCm02Model::createLink(const std::string& name, double bandwidth, double latency,
167                                        e_surf_link_sharing_policy_t policy)
168 {
169   return new NetworkCm02Link(this, name, bandwidth, latency, policy, maxminSystem_);
170 }
171
172 void NetworkCm02Model::updateActionsStateLazy(double now, double /*delta*/)
173 {
174   while (not actionHeapIsEmpty() && double_equals(actionHeapTopDate(), now, sg_surf_precision)) {
175
176     NetworkCm02Action* action = static_cast<NetworkCm02Action*>(actionHeapPop());
177     XBT_DEBUG("Something happened to action %p", action);
178     if (TRACE_is_enabled()) {
179       int n = lmm_get_number_of_cnst_from_var(maxminSystem_, action->getVariable());
180
181       for (int i = 0; i < n; i++){
182         lmm_constraint_t constraint = lmm_get_cnst_from_var(maxminSystem_, action->getVariable(), i);
183         NetworkCm02Link *link = static_cast<NetworkCm02Link*>(lmm_constraint_id(constraint));
184         double value = lmm_variable_getvalue(action->getVariable())*
185             lmm_get_cnst_weight_from_var(maxminSystem_, action->getVariable(), i);
186         TRACE_surf_link_set_utilization(link->getCname(), action->getCategory(), value, action->getLastUpdate(),
187                                         now - action->getLastUpdate());
188       }
189     }
190
191     // if I am wearing a latency hat
192     if (action->getHat() == LATENCY) {
193       XBT_DEBUG("Latency paid for action %p. Activating", action);
194       lmm_update_variable_weight(maxminSystem_, action->getVariable(), action->weight_);
195       action->heapRemove(getActionHeap());
196       action->refreshLastUpdate();
197
198         // if I am wearing a max_duration or normal hat
199     } else if (action->getHat() == MAX_DURATION || action->getHat() == NORMAL) {
200         // no need to communicate anymore
201         // assume that flows that reached max_duration have remaining of 0
202       XBT_DEBUG("Action %p finished", action);
203       action->setRemains(0);
204       action->finish(Action::State::done);
205       action->heapRemove(getActionHeap());
206     }
207   }
208 }
209
210
211 void NetworkCm02Model::updateActionsStateFull(double now, double delta)
212 {
213   for (auto it = std::begin(*getRunningActionSet()); it != std::end(*getRunningActionSet());) {
214     NetworkCm02Action& action = static_cast<NetworkCm02Action&>(*it);
215     ++it; // increment iterator here since the following calls to action.finish() may invalidate it
216     XBT_DEBUG("Something happened to action %p", &action);
217     double deltap = delta;
218     if (action.latency_ > 0) {
219       if (action.latency_ > deltap) {
220         double_update(&action.latency_, deltap, sg_surf_precision);
221         deltap = 0.0;
222       } else {
223         double_update(&deltap, action.latency_, sg_surf_precision);
224         action.latency_ = 0.0;
225       }
226       if (action.latency_ <= 0.0 && not action.isSuspended())
227         lmm_update_variable_weight(maxminSystem_, action.getVariable(), action.weight_);
228     }
229     if (TRACE_is_enabled()) {
230       int n = lmm_get_number_of_cnst_from_var(maxminSystem_, action.getVariable());
231       for (int i = 0; i < n; i++) {
232         lmm_constraint_t constraint = lmm_get_cnst_from_var(maxminSystem_, action.getVariable(), i);
233
234         NetworkCm02Link* link = static_cast<NetworkCm02Link*>(lmm_constraint_id(constraint));
235         TRACE_surf_link_set_utilization(link->getCname(), action.getCategory(),
236                                         (lmm_variable_getvalue(action.getVariable()) *
237                                          lmm_get_cnst_weight_from_var(maxminSystem_, action.getVariable(), i)),
238                                         action.getLastUpdate(), now - action.getLastUpdate());
239       }
240     }
241     if (not lmm_get_number_of_cnst_from_var(maxminSystem_, action.getVariable())) {
242       /* There is actually no link used, hence an infinite bandwidth. This happens often when using models like
243        * vivaldi. In such case, just make sure that the action completes immediately.
244        */
245       action.updateRemains(action.getRemains());
246     }
247     action.updateRemains(lmm_variable_getvalue(action.getVariable()) * delta);
248
249     if (action.getMaxDuration() > NO_MAX_DURATION)
250       action.updateMaxDuration(delta);
251
252     if (((action.getRemains() <= 0) && (lmm_get_variable_weight(action.getVariable()) > 0)) ||
253         ((action.getMaxDuration() > NO_MAX_DURATION) && (action.getMaxDuration() <= 0))) {
254       action.finish(Action::State::done);
255     }
256   }
257 }
258
259 Action* NetworkCm02Model::communicate(s4u::Host* src, s4u::Host* dst, double size, double rate)
260 {
261   int failed = 0;
262   double latency = 0.0;
263   std::vector<LinkImpl*> back_route;
264   std::vector<LinkImpl*> route;
265
266   XBT_IN("(%s,%s,%g,%g)", src->getCname(), dst->getCname(), size, rate);
267
268   src->routeTo(dst, route, &latency);
269   xbt_assert(not route.empty() || latency,
270              "You're trying to send data from %s to %s but there is no connecting path between these two hosts.",
271              src->getCname(), dst->getCname());
272
273   for (auto const& link : route)
274     if (link->isOff())
275       failed = 1;
276
277   if (sg_network_crosstraffic == 1) {
278     dst->routeTo(src, back_route, nullptr);
279     for (auto const& link : back_route)
280       if (link->isOff())
281         failed = 1;
282   }
283
284   NetworkCm02Action *action = new NetworkCm02Action(this, size, failed);
285   action->weight_ = latency;
286   action->latency_ = latency;
287   action->rate_ = rate;
288   if (getUpdateMechanism() == UM_LAZY) {
289     action->refreshLastUpdate();
290   }
291
292   double bandwidth_bound = -1.0;
293   if (sg_weight_S_parameter > 0)
294     for (auto const& link : route)
295       action->weight_ += sg_weight_S_parameter / link->bandwidth();
296
297   for (auto const& link : route) {
298     double bb       = bandwidthFactor(size) * link->bandwidth();
299     bandwidth_bound = (bandwidth_bound < 0.0) ? bb : std::min(bandwidth_bound, bb);
300   }
301
302   action->latCurrent_ = action->latency_;
303   action->latency_ *= latencyFactor(size);
304   action->rate_ = bandwidthConstraint(action->rate_, bandwidth_bound, size);
305
306   int constraints_per_variable = route.size();
307   constraints_per_variable += back_route.size();
308
309   if (action->latency_ > 0) {
310     action->setVariable(lmm_variable_new(maxminSystem_, action, 0.0, -1.0, constraints_per_variable));
311     if (getUpdateMechanism() == UM_LAZY) {
312       // add to the heap the event when the latency is payed
313       XBT_DEBUG("Added action (%p) one latency event at date %f", action, action->latency_ + action->getLastUpdate());
314       action->heapInsert(getActionHeap(), action->latency_ + action->getLastUpdate(), route.empty() ? NORMAL : LATENCY);
315     }
316   } else
317     action->setVariable(lmm_variable_new(maxminSystem_, action, 1.0, -1.0, constraints_per_variable));
318
319   if (action->rate_ < 0) {
320     lmm_update_variable_bound(maxminSystem_, action->getVariable(), (action->latCurrent_ > 0) ? sg_tcp_gamma / (2.0 * action->latCurrent_) : -1.0);
321   } else {
322     lmm_update_variable_bound(maxminSystem_, action->getVariable(), (action->latCurrent_ > 0) ? std::min(action->rate_, sg_tcp_gamma / (2.0 * action->latCurrent_)) : action->rate_);
323   }
324
325   for (auto const& link : route)
326     lmm_expand(maxminSystem_, link->constraint(), action->getVariable(), 1.0);
327
328   if (not back_route.empty()) { //  sg_network_crosstraffic was activated
329     XBT_DEBUG("Fullduplex active adding backward flow using 5%%");
330     for (auto const& link : back_route)
331       lmm_expand(maxminSystem_, link->constraint(), action->getVariable(), .05);
332
333     //Change concurrency_share here, if you want that cross-traffic is included in the SURF concurrency
334     //(You would also have to change lmm_element_concurrency())
335     //lmm_variable_concurrency_share_set(action->getVariable(),2);
336   }
337   XBT_OUT();
338
339   simgrid::s4u::Link::onCommunicate(action, src, dst);
340   return action;
341 }
342
343 /************
344  * Resource *
345  ************/
346 NetworkCm02Link::NetworkCm02Link(NetworkCm02Model* model, const std::string& name, double bandwidth, double latency,
347                                  e_surf_link_sharing_policy_t policy, lmm_system_t system)
348     : LinkImpl(model, name, lmm_constraint_new(system, this, sg_bandwidth_factor * bandwidth))
349 {
350   bandwidth_.scale = 1.0;
351   bandwidth_.peak  = bandwidth;
352
353   latency_.scale = 1.0;
354   latency_.peak  = latency;
355
356   if (policy == SURF_LINK_FATPIPE)
357     lmm_constraint_shared(constraint());
358
359   simgrid::s4u::Link::onCreation(this->piface_);
360 }
361
362 void NetworkCm02Link::apply_event(tmgr_trace_event_t triggered, double value)
363 {
364   /* Find out which of my iterators was triggered, and react accordingly */
365   if (triggered == bandwidth_.event) {
366     setBandwidth(value);
367     tmgr_trace_event_unref(&bandwidth_.event);
368
369   } else if (triggered == latency_.event) {
370     setLatency(value);
371     tmgr_trace_event_unref(&latency_.event);
372
373   } else if (triggered == stateEvent_) {
374     if (value > 0)
375       turnOn();
376     else {
377       lmm_variable_t var = nullptr;
378       lmm_element_t elem = nullptr;
379       double now = surf_get_clock();
380
381       turnOff();
382       while ((var = lmm_get_var_from_cnst(model()->getMaxminSystem(), constraint(), &elem))) {
383         Action *action = static_cast<Action*>( lmm_variable_id(var) );
384
385         if (action->getState() == Action::State::running ||
386             action->getState() == Action::State::ready) {
387           action->setFinishTime(now);
388           action->setState(Action::State::failed);
389         }
390       }
391     }
392     tmgr_trace_event_unref(&stateEvent_);
393   } else {
394     xbt_die("Unknown event!\n");
395   }
396
397   XBT_DEBUG("There was a resource state event, need to update actions related to the constraint (%p)", constraint());
398 }
399
400 void NetworkCm02Link::setBandwidth(double value)
401 {
402
403   bandwidth_.peak = value;
404
405   lmm_update_constraint_bound(model()->getMaxminSystem(), constraint(),
406                               sg_bandwidth_factor * (bandwidth_.peak * bandwidth_.scale));
407   TRACE_surf_link_set_bandwidth(surf_get_clock(), getCname(), sg_bandwidth_factor * bandwidth_.peak * bandwidth_.scale);
408
409   if (sg_weight_S_parameter > 0) {
410     double delta = sg_weight_S_parameter / value - sg_weight_S_parameter / (bandwidth_.peak * bandwidth_.scale);
411
412     lmm_variable_t var;
413     lmm_element_t elem = nullptr;
414     lmm_element_t nextelem = nullptr;
415     int numelem = 0;
416     while ((var = lmm_get_var_from_cnst_safe(model()->getMaxminSystem(), constraint(), &elem, &nextelem, &numelem))) {
417       NetworkCm02Action *action = static_cast<NetworkCm02Action*>(lmm_variable_id(var));
418       action->weight_ += delta;
419       if (not action->isSuspended())
420         lmm_update_variable_weight(model()->getMaxminSystem(), action->getVariable(), action->weight_);
421     }
422   }
423 }
424
425 void NetworkCm02Link::setLatency(double value)
426 {
427   double delta           = value - latency_.peak;
428   lmm_variable_t var = nullptr;
429   lmm_element_t elem = nullptr;
430   lmm_element_t nextelem = nullptr;
431   int numelem = 0;
432
433   latency_.peak = value;
434
435   while ((var = lmm_get_var_from_cnst_safe(model()->getMaxminSystem(), constraint(), &elem, &nextelem, &numelem))) {
436     NetworkCm02Action *action = static_cast<NetworkCm02Action*>(lmm_variable_id(var));
437     action->latCurrent_ += delta;
438     action->weight_ += delta;
439     if (action->rate_ < 0)
440       lmm_update_variable_bound(model()->getMaxminSystem(), action->getVariable(),
441                                 sg_tcp_gamma / (2.0 * action->latCurrent_));
442     else {
443       lmm_update_variable_bound(model()->getMaxminSystem(), action->getVariable(),
444                                 std::min(action->rate_, sg_tcp_gamma / (2.0 * action->latCurrent_)));
445
446       if (action->rate_ < sg_tcp_gamma / (2.0 * action->latCurrent_)) {
447         XBT_INFO("Flow is limited BYBANDWIDTH");
448       } else {
449         XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f", action->latCurrent_);
450       }
451     }
452     if (not action->isSuspended())
453       lmm_update_variable_weight(model()->getMaxminSystem(), action->getVariable(), action->weight_);
454   }
455 }
456
457 /**********
458  * Action *
459  **********/
460
461 void NetworkCm02Action::updateRemainingLazy(double now)
462 {
463   if (suspended_ != 0)
464     return;
465
466   double delta        = now - getLastUpdate();
467   double max_duration = getMaxDuration();
468
469   if (getRemainsNoUpdate() > 0) {
470     XBT_DEBUG("Updating action(%p): remains was %f, last_update was: %f", this, getRemainsNoUpdate(), getLastUpdate());
471     updateRemains(getLastValue() * delta);
472
473     XBT_DEBUG("Updating action(%p): remains is now %f", this, getRemainsNoUpdate());
474   }
475
476   if (max_duration > NO_MAX_DURATION) {
477     double_update(&max_duration, delta, sg_surf_precision);
478     setMaxDuration(max_duration);
479   }
480
481   if ((getRemainsNoUpdate() <= 0 && (lmm_get_variable_weight(getVariable()) > 0)) ||
482       ((max_duration > NO_MAX_DURATION) && (max_duration <= 0))) {
483     finish(Action::State::done);
484     heapRemove(getModel()->getActionHeap());
485   }
486
487   refreshLastUpdate();
488   setLastValue(lmm_variable_getvalue(getVariable()));
489 }
490
491 }
492 }