1 /* Copyright (c) 2013-2015. The SimGrid Team.
2 * All rights reserved. */
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. */
9 #include "network_cm02.hpp"
10 #include "maxmin_private.hpp"
11 #include "simgrid/sg_config.h"
13 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(surf_network);
15 double sg_sender_gap = 0.0;
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 */
20 double sg_tcp_gamma = 0.0;
21 int sg_network_crosstraffic = 0;
27 void net_define_callbacks(void)
29 /* Figuring out the network links */
30 sg_platf_link_add_cb(netlink_parse_init);
31 sg_platf_postparse_add_cb(net_add_traces);
38 /************************************************************************/
39 /* New model based on optimizations discussed during Pedro Velho's thesis*/
40 /************************************************************************/
41 /* @techreport{VELHO:2011:HAL-00646896:1, */
42 /* url = {http://hal.inria.fr/hal-00646896/en/}, */
43 /* title = {{Flow-level network models: have we reached the limits?}}, */
44 /* author = {Velho, Pedro and Schnorr, Lucas and Casanova, Henri and Legrand, Arnaud}, */
45 /* type = {Rapport de recherche}, */
46 /* institution = {INRIA}, */
47 /* number = {RR-7821}, */
50 /* pdf = {http://hal.inria.fr/hal-00646896/PDF/rr-validity.pdf}, */
52 void surf_network_model_init_LegrandVelho(void)
54 if (surf_network_model)
57 surf_network_model = new simgrid::surf::NetworkCm02Model();
58 net_define_callbacks();
59 simgrid::surf::Model *model = surf_network_model;
60 xbt_dynar_push(all_existing_models, &model);
62 xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor",
64 xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",
66 xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 20537);
69 /***************************************************************************/
70 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
71 /***************************************************************************/
72 /* @TechReport{ rr-lip2002-40, */
73 /* author = {Henri Casanova and Loris Marchal}, */
74 /* institution = {LIP}, */
75 /* title = {A Network Model for Simulation of Grid Application}, */
76 /* number = {2002-40}, */
80 void surf_network_model_init_CM02(void)
83 if (surf_network_model)
86 surf_network_model = new simgrid::surf::NetworkCm02Model();
87 xbt_dynar_push(all_existing_models, &surf_network_model);
88 net_define_callbacks();
90 xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 1.0);
91 xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor", 1.0);
92 xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 0.0);
95 /***************************************************************************/
96 /* The models from Steven H. Low */
97 /***************************************************************************/
99 /* author={Steven H. Low}, */
100 /* title={A Duality Model of {TCP} and Queue Management Algorithms}, */
102 /* journal={{IEEE/ACM} Transactions on Networking}, */
103 /* volume={11}, number={4}, */
105 void surf_network_model_init_Reno(void)
107 if (surf_network_model)
110 surf_network_model = new simgrid::surf::NetworkCm02Model();
111 xbt_dynar_push(all_existing_models, &surf_network_model);
112 net_define_callbacks();
113 lmm_set_default_protocol_function(func_reno_f, func_reno_fp, func_reno_fpi);
114 surf_network_model->f_networkSolve = lagrange_solve;
116 xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 10.4);
117 xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor", 0.92);
118 xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 8775);
122 void surf_network_model_init_Reno2(void)
124 if (surf_network_model)
127 surf_network_model = new simgrid::surf::NetworkCm02Model();
128 xbt_dynar_push(all_existing_models, &surf_network_model);
129 net_define_callbacks();
130 lmm_set_default_protocol_function(func_reno2_f, func_reno2_fp, func_reno2_fpi);
131 surf_network_model->f_networkSolve = lagrange_solve;
133 xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 10.4);
134 xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor", 0.92);
135 xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 8775);
138 void surf_network_model_init_Vegas(void)
140 if (surf_network_model)
143 surf_network_model = new simgrid::surf::NetworkCm02Model();
144 xbt_dynar_push(all_existing_models, &surf_network_model);
145 net_define_callbacks();
146 lmm_set_default_protocol_function(func_vegas_f, func_vegas_fp, func_vegas_fpi);
147 surf_network_model->f_networkSolve = lagrange_solve;
149 xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 10.4);
150 xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor", 0.92);
151 xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 8775);
157 NetworkCm02Model::NetworkCm02Model()
160 char *optim = xbt_cfg_get_string(_sg_cfg_set, "network/optim");
162 xbt_cfg_get_boolean(_sg_cfg_set, "network/maxmin_selective_update");
164 if (!strcmp(optim, "Full")) {
165 p_updateMechanism = UM_FULL;
166 m_selectiveUpdate = select;
167 } else if (!strcmp(optim, "Lazy")) {
168 p_updateMechanism = UM_LAZY;
169 m_selectiveUpdate = 1;
170 xbt_assert((select == 1)
172 (xbt_cfg_is_default_value
173 (_sg_cfg_set, "network/maxmin_selective_update")),
174 "Disabling selective update while using the lazy update mechanism is dumb!");
176 xbt_die("Unsupported optimization (%s) for this model", optim);
180 p_maxminSystem = lmm_system_new(m_selectiveUpdate);
182 routing_model_create(createLink("__loopback__",
183 498000000, NULL, 0.000015, NULL,
184 SURF_RESOURCE_ON, NULL,
185 SURF_LINK_FATPIPE, NULL));
187 if (p_updateMechanism == UM_LAZY) {
188 p_actionHeap = xbt_heap_new(8, NULL);
189 xbt_heap_set_update_callback(p_actionHeap, surf_action_lmm_update_index_heap);
190 p_modifiedSet = new ActionLmmList();
191 p_maxminSystem->keep_track = p_modifiedSet;
195 Link* NetworkCm02Model::createLink(const char *name,
197 tmgr_trace_t bw_trace,
199 tmgr_trace_t lat_trace,
200 e_surf_resource_state_t state_initial,
201 tmgr_trace_t state_trace,
202 e_surf_link_sharing_policy_t policy,
203 xbt_dict_t properties)
205 xbt_assert(NULL == Link::byName(name),
206 "Link '%s' declared several times in the platform",
209 Link* link = new NetworkCm02Link(this, name, properties, p_maxminSystem, sg_bandwidth_factor * bw_initial, history,
210 state_initial, state_trace, bw_initial, bw_trace, lat_initial, lat_trace, policy);
211 Link::onCreation(link);
215 void NetworkCm02Model::updateActionsStateLazy(double now, double /*delta*/)
217 NetworkCm02Action *action;
218 while ((xbt_heap_size(p_actionHeap) > 0)
219 && (double_equals(xbt_heap_maxkey(p_actionHeap), now, sg_surf_precision))) {
220 action = static_cast<NetworkCm02Action*> (xbt_heap_pop(p_actionHeap));
221 XBT_DEBUG("Something happened to action %p", action);
222 if (TRACE_is_enabled()) {
223 int n = lmm_get_number_of_cnst_from_var(p_maxminSystem, action->getVariable());
225 for (i = 0; i < n; i++){
226 lmm_constraint_t constraint = lmm_get_cnst_from_var(p_maxminSystem,
227 action->getVariable(),
229 NetworkCm02Link *link = static_cast<NetworkCm02Link*>(lmm_constraint_id(constraint));
230 TRACE_surf_link_set_utilization(link->getName(),
231 action->getCategory(),
232 (lmm_variable_getvalue(action->getVariable())*
233 lmm_get_cnst_weight_from_var(p_maxminSystem,
234 action->getVariable(),
236 action->getLastUpdate(),
237 now - action->getLastUpdate());
241 // if I am wearing a latency hat
242 if (action->getHat() == LATENCY) {
243 XBT_DEBUG("Latency paid for action %p. Activating", action);
244 lmm_update_variable_weight(p_maxminSystem, action->getVariable(), action->m_weight);
245 action->heapRemove(p_actionHeap);
246 action->refreshLastUpdate();
248 // if I am wearing a max_duration or normal hat
249 } else if (action->getHat() == MAX_DURATION ||
250 action->getHat() == NORMAL) {
251 // no need to communicate anymore
252 // assume that flows that reached max_duration have remaining of 0
253 XBT_DEBUG("Action %p finished", action);
254 action->setRemains(0);
256 action->setState(SURF_ACTION_DONE);
257 action->heapRemove(p_actionHeap);
266 void NetworkCm02Model::updateActionsStateFull(double now, double delta)
268 NetworkCm02Action *action;
269 ActionList *running_actions = getRunningActionSet();
271 for(ActionList::iterator it(running_actions->begin()), itNext=it, itend(running_actions->end())
272 ; it != itend ; it=itNext) {
275 action = static_cast<NetworkCm02Action*> (&*it);
276 XBT_DEBUG("Something happened to action %p", action);
277 double deltap = delta;
278 if (action->m_latency > 0) {
279 if (action->m_latency > deltap) {
280 double_update(&(action->m_latency), deltap, sg_surf_precision);
283 double_update(&(deltap), action->m_latency, sg_surf_precision);
284 action->m_latency = 0.0;
286 if (action->m_latency == 0.0 && !(action->isSuspended()))
287 lmm_update_variable_weight(p_maxminSystem, action->getVariable(),
290 if (TRACE_is_enabled()) {
291 int n = lmm_get_number_of_cnst_from_var(p_maxminSystem, action->getVariable());
293 for (i = 0; i < n; i++){
294 lmm_constraint_t constraint = lmm_get_cnst_from_var(p_maxminSystem,
295 action->getVariable(),
297 NetworkCm02Link* link = static_cast<NetworkCm02Link*>(lmm_constraint_id(constraint));
298 TRACE_surf_link_set_utilization(link->getName(),
299 action->getCategory(),
300 (lmm_variable_getvalue(action->getVariable())*
301 lmm_get_cnst_weight_from_var(p_maxminSystem,
302 action->getVariable(),
304 action->getLastUpdate(),
305 now - action->getLastUpdate());
308 if (!lmm_get_number_of_cnst_from_var
309 (p_maxminSystem, action->getVariable())) {
310 /* There is actually no link used, hence an infinite bandwidth.
311 * This happens often when using models like vivaldi.
312 * In such case, just make sure that the action completes immediately.
314 action->updateRemains(action->getRemains());
316 action->updateRemains(lmm_variable_getvalue(action->getVariable()) * delta);
318 if (action->getMaxDuration() != NO_MAX_DURATION)
319 action->updateMaxDuration(delta);
321 if ((action->getRemains() <= 0) &&
322 (lmm_get_variable_weight(action->getVariable()) > 0)) {
324 action->setState(SURF_ACTION_DONE);
326 } else if (((action->getMaxDuration() != NO_MAX_DURATION)
327 && (action->getMaxDuration() <= 0))) {
329 action->setState(SURF_ACTION_DONE);
336 Action *NetworkCm02Model::communicate(NetCard *src, NetCard *dst,
337 double size, double rate)
341 NetworkCm02Link *link;
343 NetworkCm02Action *action = NULL;
344 double bandwidth_bound;
345 double latency = 0.0;
346 xbt_dynar_t back_route = NULL;
347 int constraints_per_variable = 0;
349 xbt_dynar_t route = xbt_dynar_new(sizeof(NetCard*), NULL);
351 XBT_IN("(%s,%s,%g,%g)", src->getName(), dst->getName(), size, rate);
353 routing_platf->getRouteAndLatency(src, dst, &route, &latency);
354 xbt_assert(!xbt_dynar_is_empty(route) || latency,
355 "You're trying to send data from %s to %s but there is no connection at all between these two hosts.",
356 src->getName(), dst->getName());
358 xbt_dynar_foreach(route, i, _link) {
359 link = static_cast<NetworkCm02Link*>(_link);
360 if (link->getState() == SURF_RESOURCE_OFF) {
365 if (sg_network_crosstraffic == 1) {
366 routing_platf->getRouteAndLatency(dst, src, &back_route, NULL);
367 xbt_dynar_foreach(back_route, i, _link) {
368 link = static_cast<NetworkCm02Link*>(_link);
369 if (link->getState() == SURF_RESOURCE_OFF) {
376 action = new NetworkCm02Action(this, size, failed);
378 #ifdef HAVE_LATENCY_BOUND_TRACKING
379 action->m_latencyLimited = 0;
381 action->m_weight = action->m_latency = latency;
383 action->m_rate = rate;
384 if (p_updateMechanism == UM_LAZY) {
385 action->m_indexHeap = -1;
386 action->m_lastUpdate = surf_get_clock();
389 bandwidth_bound = -1.0;
390 if (sg_weight_S_parameter > 0) {
391 xbt_dynar_foreach(route, i, _link) {
392 link = static_cast<NetworkCm02Link*>(_link);
393 action->m_weight += sg_weight_S_parameter / link->getBandwidth();
396 xbt_dynar_foreach(route, i, _link) {
397 link = static_cast<NetworkCm02Link*>(_link);
398 double bb = bandwidthFactor(size) * link->getBandwidth();
400 (bandwidth_bound < 0.0) ? bb : std::min(bandwidth_bound, bb);
403 action->m_latCurrent = action->m_latency;
404 action->m_latency *= latencyFactor(size);
405 action->m_rate = bandwidthConstraint(action->m_rate, bandwidth_bound, size);
407 xbt_assert(!xbt_dynar_is_empty(route),
408 "Using a model with a gap (e.g., SMPI) with a platform without links (e.g. vivaldi)!!!");
410 link = *static_cast<NetworkCm02Link **>(xbt_dynar_get_ptr(route, 0));
411 gapAppend(size, link, action);
412 XBT_DEBUG("Comm %p: %s -> %s gap=%f (lat=%f)",
413 action, src->getName(), dst->getName(), action->m_senderGap,
417 constraints_per_variable = xbt_dynar_length(route);
418 if (back_route != NULL)
419 constraints_per_variable += xbt_dynar_length(back_route);
421 if (action->m_latency > 0) {
422 action->p_variable = lmm_variable_new(p_maxminSystem, action, 0.0, -1.0,
423 constraints_per_variable);
424 if (p_updateMechanism == UM_LAZY) {
425 // add to the heap the event when the latency is payed
426 XBT_DEBUG("Added action (%p) one latency event at date %f", action,
427 action->m_latency + action->m_lastUpdate);
428 action->heapInsert(p_actionHeap, action->m_latency + action->m_lastUpdate, xbt_dynar_is_empty(route) ? NORMAL : LATENCY);
431 action->p_variable = lmm_variable_new(p_maxminSystem, action, 1.0, -1.0, constraints_per_variable);
433 if (action->m_rate < 0) {
434 lmm_update_variable_bound(p_maxminSystem, action->getVariable(), (action->m_latCurrent > 0) ? sg_tcp_gamma / (2.0 * action->m_latCurrent) : -1.0);
436 lmm_update_variable_bound(p_maxminSystem, action->getVariable(), (action->m_latCurrent > 0) ? std::min(action->m_rate, sg_tcp_gamma / (2.0 * action->m_latCurrent)) : action->m_rate);
439 xbt_dynar_foreach(route, i, _link) {
440 link = static_cast<NetworkCm02Link*>(_link);
441 lmm_expand(p_maxminSystem, link->getConstraint(), action->getVariable(), 1.0);
444 if (sg_network_crosstraffic == 1) {
445 XBT_DEBUG("Fullduplex active adding backward flow using 5%%");
446 xbt_dynar_foreach(back_route, i, _link) {
447 link = static_cast<NetworkCm02Link*>(_link);
448 lmm_expand(p_maxminSystem, link->getConstraint(), action->getVariable(), .05);
452 xbt_dynar_free(&route);
455 networkCommunicateCallbacks(action, src, dst, size, rate);
459 void NetworkCm02Model::addTraces(){
460 xbt_dict_cursor_t cursor = NULL;
461 char *trace_name, *elm;
463 static int called = 0;
468 /* connect all traces relative to network */
469 xbt_dict_foreach(trace_connect_list_link_avail, cursor, trace_name, elm) {
470 tmgr_trace_t trace = (tmgr_trace_t) xbt_dict_get_or_null(traces_set_list, trace_name);
471 NetworkCm02Link *link = static_cast<NetworkCm02Link*>( Link::byName(elm) );
473 xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
476 "Cannot connect trace %s to link %s: trace undefined",
479 link->p_stateEvent = tmgr_history_add_trace(history, trace, 0.0, 0, link);
482 xbt_dict_foreach(trace_connect_list_bandwidth, cursor, trace_name, elm) {
483 tmgr_trace_t trace = (tmgr_trace_t) xbt_dict_get_or_null(traces_set_list, trace_name);
484 NetworkCm02Link *link = static_cast<NetworkCm02Link*>( Link::byName(elm) );
486 xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
489 "Cannot connect trace %s to link %s: trace undefined",
492 link->p_speed.event = tmgr_history_add_trace(history, trace, 0.0, 0, link);
495 xbt_dict_foreach(trace_connect_list_latency, cursor, trace_name, elm) {
496 tmgr_trace_t trace = (tmgr_trace_t) xbt_dict_get_or_null(traces_set_list, trace_name);
497 NetworkCm02Link *link = static_cast<NetworkCm02Link*>(Link::byName(elm));;
499 xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
502 "Cannot connect trace %s to link %s: trace undefined",
505 link->p_latEvent = tmgr_history_add_trace(history, trace, 0.0, 0, link);
512 NetworkCm02Link::NetworkCm02Link(NetworkCm02Model *model, const char *name, xbt_dict_t props,
514 double constraint_value,
515 tmgr_history_t history,
516 e_surf_resource_state_t state_init,
517 tmgr_trace_t state_trace,
519 tmgr_trace_t metric_trace,
521 tmgr_trace_t lat_trace,
522 e_surf_link_sharing_policy_t policy)
523 : Link(model, name, props, lmm_constraint_new(system, this, constraint_value), history, state_trace)
525 setState(state_init);
528 p_speed.peak = metric_peak;
530 p_speed.event = tmgr_history_add_trace(history, metric_trace, 0.0, 0, this);
532 p_speed.event = NULL;
534 m_latCurrent = lat_initial;
536 p_latEvent = tmgr_history_add_trace(history, lat_trace, 0.0, 0, this);
538 if (policy == SURF_LINK_FATPIPE)
539 lmm_constraint_shared(getConstraint());
544 void NetworkCm02Link::updateState(tmgr_trace_event_t event_type,
545 double value, double date)
547 /* printf("[" "%g" "] Asking to update network card \"%s\" with value " */
548 /* "%g" " for event %p\n", surf_get_clock(), nw_link->name, */
549 /* value, event_type); */
551 if (event_type == p_speed.event) {
552 updateBandwidth(value, date);
553 if (tmgr_trace_event_free(event_type))
554 p_speed.event = NULL;
555 } else if (event_type == p_latEvent) {
556 updateLatency(value, date);
557 if (tmgr_trace_event_free(event_type))
559 } else if (event_type == p_stateEvent) {
561 setState(SURF_RESOURCE_ON);
563 lmm_constraint_t cnst = getConstraint();
564 lmm_variable_t var = NULL;
565 lmm_element_t elem = NULL;
567 setState(SURF_RESOURCE_OFF);
568 while ((var = lmm_get_var_from_cnst(getModel()->getMaxminSystem(), cnst, &elem))) {
569 Action *action = static_cast<Action*>( lmm_variable_id(var) );
571 if (action->getState() == SURF_ACTION_RUNNING ||
572 action->getState() == SURF_ACTION_READY) {
573 action->setFinishTime(date);
574 action->setState(SURF_ACTION_FAILED);
578 if (tmgr_trace_event_free(event_type))
581 XBT_CRITICAL("Unknown event ! \n");
586 ("There were a resource state event, need to update actions related to the constraint (%p)",
591 void NetworkCm02Link::updateBandwidth(double value, double date){
592 double delta = sg_weight_S_parameter / value - sg_weight_S_parameter /
593 (p_speed.peak * p_speed.scale);
594 lmm_variable_t var = NULL;
595 lmm_element_t elem = NULL;
596 lmm_element_t nextelem = NULL;
599 NetworkCm02Action *action = NULL;
601 p_speed.peak = value;
602 lmm_update_constraint_bound(getModel()->getMaxminSystem(),
604 sg_bandwidth_factor *
605 (p_speed.peak * p_speed.scale));
606 TRACE_surf_link_set_bandwidth(date, getName(), sg_bandwidth_factor * p_speed.peak * p_speed.scale);
607 if (sg_weight_S_parameter > 0) {
608 while ((var = lmm_get_var_from_cnst_safe(getModel()->getMaxminSystem(), getConstraint(), &elem, &nextelem, &numelem))) {
609 action = (NetworkCm02Action*) lmm_variable_id(var);
610 action->m_weight += delta;
611 if (!action->isSuspended())
612 lmm_update_variable_weight(getModel()->getMaxminSystem(), action->getVariable(), action->m_weight);
617 void NetworkCm02Link::updateLatency(double value, double date){
618 double delta = value - m_latCurrent;
619 lmm_variable_t var = NULL;
620 lmm_element_t elem = NULL;
621 lmm_element_t nextelem = NULL;
623 NetworkCm02Action *action = NULL;
625 m_latCurrent = value;
626 while ((var = lmm_get_var_from_cnst_safe(getModel()->getMaxminSystem(), getConstraint(), &elem, &nextelem, &numelem))) {
627 action = (NetworkCm02Action*) lmm_variable_id(var);
628 action->m_latCurrent += delta;
629 action->m_weight += delta;
630 if (action->m_rate < 0)
631 lmm_update_variable_bound(getModel()->getMaxminSystem(), action->getVariable(), sg_tcp_gamma / (2.0 * action->m_latCurrent));
633 lmm_update_variable_bound(getModel()->getMaxminSystem(), action->getVariable(),
634 std::min(action->m_rate, sg_tcp_gamma / (2.0 * action->m_latCurrent)));
636 if (action->m_rate < sg_tcp_gamma / (2.0 * action->m_latCurrent)) {
637 XBT_INFO("Flow is limited BYBANDWIDTH");
639 XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f",
640 action->m_latCurrent);
643 if (!action->isSuspended())
644 lmm_update_variable_weight(getModel()->getMaxminSystem(), action->getVariable(), action->m_weight);
651 void NetworkCm02Action::updateRemainingLazy(double now)
655 if (m_suspended != 0)
658 delta = now - m_lastUpdate;
661 XBT_DEBUG("Updating action(%p): remains was %f, last_update was: %f", this, m_remains, m_lastUpdate);
662 double_update(&(m_remains), m_lastValue * delta, sg_maxmin_precision*sg_surf_precision);
664 XBT_DEBUG("Updating action(%p): remains is now %f", this, m_remains);
667 if (m_maxDuration != NO_MAX_DURATION)
668 double_update(&m_maxDuration, delta, sg_surf_precision);
670 if (m_remains <= 0 &&
671 (lmm_get_variable_weight(getVariable()) > 0)) {
673 setState(SURF_ACTION_DONE);
675 heapRemove(getModel()->getActionHeap());
676 } else if (((m_maxDuration != NO_MAX_DURATION)
677 && (m_maxDuration <= 0))) {
679 setState(SURF_ACTION_DONE);
680 heapRemove(getModel()->getActionHeap());
684 m_lastValue = lmm_variable_getvalue(getVariable());