1 /* Copyright (c) 2012-2017. 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. */
8 * 1. add the support of trace
9 * 2. use parallel tasks to simulate CPU overhead and remove the experimental code generating micro computation tasks
14 #include "simgrid/plugins/live_migration.h"
15 #include "src/instr/instr_private.hpp"
16 #include "src/plugins/vm/VirtualMachineImpl.hpp"
17 #include "src/plugins/vm/VmHostExt.hpp"
19 #include "simgrid/host.h"
20 #include "simgrid/simix.hpp"
21 #include "xbt/string.hpp"
25 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_vm, msg, "Cloud-oriented parts of the MSG API");
27 const char* MSG_vm_get_name(msg_vm_t vm)
29 return vm->getCname();
32 /** \ingroup m_vm_management
33 * \brief Set the parameters of a given host
36 * \param params a parameter object
38 void MSG_vm_set_params(msg_vm_t vm, vm_params_t params)
40 vm->setParameters(params);
43 /** \ingroup m_vm_management
44 * \brief Get the parameters of a given host
46 * \param vm the vm you are interested into
47 * \param params a prameter object
49 void MSG_vm_get_params(msg_vm_t vm, vm_params_t params)
51 vm->getParameters(params);
54 void MSG_vm_set_ramsize(msg_vm_t vm, size_t size)
58 size_t MSG_vm_get_ramsize(msg_vm_t vm)
60 return vm->getRamsize();
63 /* **** Check state of a VM **** */
64 static inline int __MSG_vm_is_state(msg_vm_t vm, e_surf_vm_state_t state)
66 return vm->pimpl_vm_ != nullptr && vm->getState() == state;
69 /** @brief Returns whether the given VM has just created, not running.
72 int MSG_vm_is_created(msg_vm_t vm)
74 return __MSG_vm_is_state(vm, SURF_VM_STATE_CREATED);
77 /** @brief Returns whether the given VM is currently running
80 int MSG_vm_is_running(msg_vm_t vm)
82 return __MSG_vm_is_state(vm, SURF_VM_STATE_RUNNING);
85 /** @brief Returns whether the given VM is currently migrating
88 int MSG_vm_is_migrating(msg_vm_t vm)
90 return vm->isMigrating();
93 /** @brief Returns whether the given VM is currently suspended, not running.
96 int MSG_vm_is_suspended(msg_vm_t vm)
98 return __MSG_vm_is_state(vm, SURF_VM_STATE_SUSPENDED);
101 /* **** ******** MSG vm actions ********* **** */
102 /** @brief Create a new VM with specified parameters.
104 * @param pm Physical machine that will host the VM
105 * @param name Must be unique
106 * @param coreAmount Must be >= 1
107 * @param ramsize [TODO]
108 * @param mig_netspeed Amount of Mbyte/s allocated to the migration (cannot be larger than net_cap). Use 0 if unsure.
109 * @param dp_intensity Dirty page percentage according to migNetSpeed, [0-100]. Use 0 if unsure.
111 msg_vm_t MSG_vm_create(msg_host_t pm, const char* name, int coreAmount, int ramsize, int mig_netspeed, int dp_intensity)
113 simgrid::vm::VmHostExt::ensureVmExtInstalled();
115 /* For the moment, intensity_rate is the percentage against the migration bandwidth */
117 msg_vm_t vm = new simgrid::s4u::VirtualMachine(name, pm, coreAmount, static_cast<sg_size_t>(ramsize) * 1024 * 1024);
118 s_vm_params_t params;
119 params.max_downtime = 0.03;
120 params.mig_speed = static_cast<double>(mig_netspeed) * 1024 * 1024; // mig_speed
121 params.dp_intensity = static_cast<double>(dp_intensity) / 100;
122 params.dp_cap = vm->getRamsize() * 0.9; // assume working set memory is 90% of ramsize
124 XBT_DEBUG("migspeed : %f intensity mem : %d", params.mig_speed, dp_intensity);
125 vm->setParameters(¶ms);
130 /** @brief Create a new VM object with the default parameters
133 * A VM is treated as a host. The name of the VM must be unique among all hosts.
135 msg_vm_t MSG_vm_create_core(msg_host_t pm, const char* name)
137 xbt_assert(sg_host_by_name(name) == nullptr,
138 "Cannot create a VM named %s: this name is already used by an host or a VM", name);
140 msg_vm_t vm = new simgrid::s4u::VirtualMachine(name, pm, 1);
141 s_vm_params_t params;
142 memset(¶ms, 0, sizeof(params));
143 vm->setParameters(¶ms);
146 /** @brief Create a new VM object with the default parameters, but with a specified amount of cores
149 * A VM is treated as a host. The name of the VM must be unique among all hosts.
151 msg_vm_t MSG_vm_create_multicore(msg_host_t pm, const char* name, int coreAmount)
153 xbt_assert(sg_host_by_name(name) == nullptr,
154 "Cannot create a VM named %s: this name is already used by an host or a VM", name);
156 msg_vm_t vm = new simgrid::s4u::VirtualMachine(name, pm, coreAmount);
157 s_vm_params_t params;
158 memset(¶ms, 0, sizeof(params));
159 vm->setParameters(¶ms);
163 /** @brief Destroy a VM. Destroy the VM object from the simulation.
166 void MSG_vm_destroy(msg_vm_t vm)
168 if (vm->isMigrating())
169 THROWF(vm_error, 0, "Cannot destroy VM '%s', which is migrating.", vm->getCname());
171 /* First, terminate all processes on the VM if necessary */
174 /* Then, destroy the VM object */
177 if (TRACE_msg_vm_is_enabled()) {
178 container_t container = simgrid::instr::Container::byName(vm->getName());
179 container->removeFromParent();
184 /** @brief Start a vm (i.e., boot the guest operating system)
187 * If the VM cannot be started (because of memory over-provisioning), an exception is generated.
189 void MSG_vm_start(msg_vm_t vm)
192 if (TRACE_msg_vm_is_enabled()) {
193 simgrid::instr::StateType* state = simgrid::instr::Container::byName(vm->getName())->getState("MSG_VM_STATE");
194 state->addEntityValue("start", "0 0 1"); // start is blue
195 state->pushEvent("start");
199 /** @brief Immediately kills all processes within the given VM.
202 * Any memory that they allocated will be leaked, unless you used #MSG_process_on_exit().
204 * No extra delay occurs. If you want to simulate this too, you want to use a #MSG_process_sleep().
206 void MSG_vm_shutdown(msg_vm_t vm)
211 static std::string get_mig_process_tx_name(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm)
213 return std::string("__pr_mig_tx:") + vm->getCname() + "(" + src_pm->getCname() + "-" + dst_pm->getCname() + ")";
216 static std::string get_mig_process_rx_name(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm)
218 return std::string("__pr_mig_rx:") + vm->getCname() + "(" + src_pm->getCname() + "-" + dst_pm->getCname() + ")";
221 static std::string get_mig_task_name(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm, int stage)
223 return std::string("__task_mig_stage") + std::to_string(stage) + ":" + vm->getCname() + "(" + src_pm->getCname() +
224 "-" + dst_pm->getCname() + ")";
227 struct migration_session {
232 /* The miration_rx process uses mbox_ctl to let the caller of do_migration()
233 * know the completion of the migration. */
234 std::string mbox_ctl;
235 /* The migration_rx and migration_tx processes use mbox to transfer migration data. */
239 static int migration_rx_fun(int argc, char *argv[])
241 XBT_DEBUG("mig: rx_start");
243 // The structure has been created in the do_migration function and should only be freed in the same place ;)
244 migration_session* ms = static_cast<migration_session*>(MSG_process_get_data(MSG_process_self()));
246 bool received_finalize = false;
248 std::string finalize_task_name = get_mig_task_name(ms->vm, ms->src_pm, ms->dst_pm, 3);
249 while (not received_finalize) {
250 msg_task_t task = nullptr;
251 int ret = MSG_task_recv(&task, ms->mbox.c_str());
254 // An error occurred, clean the code and return
255 // The owner did not change, hence the task should be only destroyed on the other side
259 if (finalize_task_name == task->name)
260 received_finalize = 1;
262 MSG_task_destroy(task);
265 // Here Stage 1, 2 and 3 have been performed.
266 // Hence complete the migration
268 // Copy the reference to the vm (if SRC crashes now, do_migration will free ms)
269 // This is clearly ugly but I (Adrien) need more time to do something cleaner (actually we should copy the whole ms
270 // structure at the beginning and free it at the end of each function)
271 simgrid::s4u::VirtualMachine* vm = ms->vm;
272 msg_host_t dst_pm = ms->dst_pm;
274 // Make sure that we cannot get interrupted between the migrate and the resume to not end in an inconsistent state
275 simgrid::simix::kernelImmediate([vm, dst_pm]() {
276 /* Update the vm location */
277 /* precopy migration makes the VM temporally paused */
278 xbt_assert(vm->getState() == SURF_VM_STATE_SUSPENDED);
280 /* Update the vm location and resume it */
281 vm->pimpl_vm_->setPm(dst_pm);
286 // Now the VM is running on the new host (the migration is completed) (even if the SRC crash)
287 vm->pimpl_vm_->isMigrating = false;
288 XBT_DEBUG("VM(%s) moved from PM(%s) to PM(%s)", ms->vm->getCname(), ms->src_pm->getCname(), ms->dst_pm->getCname());
290 if (TRACE_msg_vm_is_enabled()) {
291 static long long int counter = 0;
292 std::string key = std::to_string(counter);
296 container_t msg = simgrid::instr::Container::byName(vm->getName());
297 simgrid::instr::Container::getRoot()->getLink("MSG_VM_LINK")->startEvent(msg, "M", key);
299 // destroy existing container of this vm
300 container_t existing_container = simgrid::instr::Container::byName(vm->getName());
301 existing_container->removeFromParent();
302 delete existing_container;
304 // create new container on the new_host location
305 new simgrid::instr::Container(vm->getCname(), "MSG_VM", simgrid::instr::Container::byName(ms->dst_pm->getName()));
308 msg = simgrid::instr::Container::byName(vm->getName());
309 simgrid::instr::Container::getRoot()->getLink("MSG_VM_LINK")->endEvent(msg, "M", key);
312 // Inform the SRC that the migration has been correctly performed
313 std::string task_name = get_mig_task_name(ms->vm, ms->src_pm, ms->dst_pm, 4);
314 msg_task_t task = MSG_task_create(task_name.c_str(), 0, 0, nullptr);
315 msg_error_t ret = MSG_task_send(task, ms->mbox_ctl.c_str());
316 if(ret == MSG_HOST_FAILURE){
317 // The DST has crashed, this is a problem has the VM since we are not sure whether SRC is considering that the VM
318 // has been correctly migrated on the DST node
319 // TODO What does it mean ? What should we do ?
320 MSG_task_destroy(task);
321 } else if(ret == MSG_TRANSFER_FAILURE){
322 // The SRC has crashed, this is not a problem has the VM has been correctly migrated on the DST node
323 MSG_task_destroy(task);
326 XBT_DEBUG("mig: rx_done");
330 static sg_size_t send_migration_data(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm, sg_size_t size,
331 const std::string& mbox, int stage, int stage2_round, double mig_speed,
335 std::string task_name = get_mig_task_name(vm, src_pm, dst_pm, stage);
336 msg_task_t task = MSG_task_create(task_name.c_str(), 0, static_cast<double>(size), nullptr);
338 double clock_sta = MSG_get_clock();
342 ret = MSG_task_send_with_timeout_bounded(task, mbox.c_str(), timeout, mig_speed);
344 ret = MSG_task_send(task, mbox.c_str());
348 } else if (ret == MSG_TIMEOUT) {
349 sg_size_t remaining = static_cast<sg_size_t>(MSG_task_get_remaining_communication(task));
350 sent = size - remaining;
351 XBT_VERB("timeout (%lf s) in sending_migration_data, remaining %llu bytes of %llu", timeout, remaining, size);
354 /* FIXME: why try-and-catch is used here? */
355 if(ret == MSG_HOST_FAILURE){
356 XBT_DEBUG("SRC host failed during migration of %s (stage %d)", vm->getCname(), stage);
357 MSG_task_destroy(task);
358 THROWF(host_error, 0, "SRC host failed during migration of %s (stage %d)", vm->getCname(), stage);
359 }else if(ret == MSG_TRANSFER_FAILURE){
360 XBT_DEBUG("DST host failed during migration of %s (stage %d)", vm->getCname(), stage);
361 MSG_task_destroy(task);
362 THROWF(host_error, 0, "DST host failed during migration of %s (stage %d)", vm->getCname(), stage);
365 double clock_end = MSG_get_clock();
366 double duration = clock_end - clock_sta;
367 double actual_speed = size / duration;
370 XBT_DEBUG("mig-stage%d.%d: sent %llu duration %f actual_speed %f (target %f)", stage, stage2_round, size, duration,
371 actual_speed, mig_speed);
373 XBT_DEBUG("mig-stage%d: sent %llu duration %f actual_speed %f (target %f)", stage, size, duration, actual_speed,
379 static sg_size_t get_updated_size(double computed, double dp_rate, double dp_cap)
381 double updated_size = computed * dp_rate;
382 XBT_DEBUG("updated_size %f dp_rate %f", updated_size, dp_rate);
383 if (updated_size > dp_cap) {
384 updated_size = dp_cap;
387 return static_cast<sg_size_t>(updated_size);
390 static int migration_tx_fun(int argc, char *argv[])
392 XBT_DEBUG("mig: tx_start");
394 // Note that the ms structure has been allocated in do_migration and hence should be freed in the same function ;)
395 migration_session* ms = static_cast<migration_session*>(MSG_process_get_data(MSG_process_self()));
397 double host_speed = ms->vm->getPm()->getSpeed();
398 s_vm_params_t params;
399 ms->vm->getParameters(¶ms);
400 const sg_size_t ramsize = ms->vm->getRamsize();
401 const double dp_rate = host_speed ? (params.mig_speed * params.dp_intensity) / host_speed : 1;
402 const double dp_cap = params.dp_cap;
403 const double mig_speed = params.mig_speed;
404 double max_downtime = params.max_downtime;
406 double mig_timeout = 10000000.0;
407 bool skip_stage2 = false;
409 size_t remaining_size = ramsize;
410 size_t threshold = 0.0;
412 /* check parameters */
414 XBT_WARN("migrate a VM, but ramsize is zero");
416 if (max_downtime <= 0) {
417 XBT_WARN("use the default max_downtime value 30ms");
421 /* Stage1: send all memory pages to the destination. */
422 XBT_DEBUG("mig-stage1: remaining_size %zu", remaining_size);
423 sg_vm_start_dirty_page_tracking(ms->vm);
425 double computed_during_stage1 = 0;
426 double clock_prev_send = MSG_get_clock();
429 /* At stage 1, we do not need timeout. We have to send all the memory pages even though the duration of this
430 * transfer exceeds the timeout value. */
431 XBT_VERB("Stage 1: Gonna send %llu bytes", ramsize);
432 sg_size_t sent = send_migration_data(ms->vm, ms->src_pm, ms->dst_pm, ramsize, ms->mbox, 1, 0, mig_speed, -1);
433 remaining_size -= sent;
434 computed_during_stage1 = sg_vm_lookup_computed_flops(ms->vm);
436 if (sent < ramsize) {
437 XBT_VERB("mig-stage1: timeout, force moving to stage 3");
439 } else if (sent > ramsize)
442 } catch (xbt_ex& e) {
443 // hostfailure (if you want to know whether this is the SRC or the DST check directly in send_migration_data code)
444 // Stop the dirty page tracking an return (there is no memory space to release)
445 sg_vm_stop_dirty_page_tracking(ms->vm);
449 double clock_post_send = MSG_get_clock();
450 mig_timeout -= (clock_post_send - clock_prev_send);
451 if (mig_timeout < 0) {
452 XBT_VERB("The duration of stage 1 exceeds the timeout value, skip stage 2");
456 /* estimate bandwidth */
457 double bandwidth = ramsize / (clock_post_send - clock_prev_send);
458 threshold = bandwidth * max_downtime;
459 XBT_DEBUG("actual bandwidth %f (MB/s), threshold %zu", bandwidth / 1024 / 1024, threshold);
461 /* Stage2: send update pages iteratively until the size of remaining states becomes smaller than threshold value. */
462 if (not skip_stage2) {
464 int stage2_round = 0;
467 sg_size_t updated_size = 0;
468 if (stage2_round == 0) {
469 /* just after stage1, nothing has been updated. But, we have to send the data updated during stage1 */
470 updated_size = get_updated_size(computed_during_stage1, dp_rate, dp_cap);
472 double computed = sg_vm_lookup_computed_flops(ms->vm);
473 updated_size = get_updated_size(computed, dp_rate, dp_cap);
476 XBT_DEBUG("mig-stage 2:%d updated_size %llu computed_during_stage1 %f dp_rate %f dp_cap %f", stage2_round,
477 updated_size, computed_during_stage1, dp_rate, dp_cap);
479 /* Check whether the remaining size is below the threshold value. If so, move to stage 3. */
480 remaining_size += updated_size;
481 XBT_DEBUG("mig-stage2.%d: remaining_size %zu (%s threshold %zu)", stage2_round, remaining_size,
482 (remaining_size < threshold) ? "<" : ">", threshold);
483 if (remaining_size < threshold)
487 double clock_prev_send = MSG_get_clock();
489 XBT_DEBUG("Stage 2, gonna send %llu", updated_size);
490 sent = send_migration_data(ms->vm, ms->src_pm, ms->dst_pm, updated_size, ms->mbox, 2, stage2_round, mig_speed,
492 } catch (xbt_ex& e) {
493 // hostfailure (if you want to know whether this is the SRC or the DST check directly in send_migration_data
495 // Stop the dirty page tracking an return (there is no memory space to release)
496 sg_vm_stop_dirty_page_tracking(ms->vm);
499 double clock_post_send = MSG_get_clock();
501 if (sent == updated_size) {
502 /* timeout did not happen */
503 double bandwidth = updated_size / (clock_post_send - clock_prev_send);
504 threshold = bandwidth * max_downtime;
505 XBT_DEBUG("actual bandwidth %f, threshold %zu", bandwidth / 1024 / 1024, threshold);
506 remaining_size -= sent;
508 mig_timeout -= (clock_post_send - clock_prev_send);
509 xbt_assert(mig_timeout > 0);
511 } else if (sent < updated_size) {
512 /* When timeout happens, we move to stage 3. The size of memory pages
513 * updated before timeout must be added to the remaining size. */
514 XBT_VERB("mig-stage2.%d: timeout, force moving to stage 3. sent %llu / %llu, eta %lf", stage2_round, sent,
515 updated_size, (clock_post_send - clock_prev_send));
516 remaining_size -= sent;
518 double computed = sg_vm_lookup_computed_flops(ms->vm);
519 updated_size = get_updated_size(computed, dp_rate, dp_cap);
520 remaining_size += updated_size;
527 /* Stage3: stop the VM and copy the rest of states. */
528 XBT_DEBUG("mig-stage3: remaining_size %zu", remaining_size);
529 simgrid::vm::VirtualMachineImpl* pimpl = ms->vm->pimpl_vm_;
530 pimpl->setState(SURF_VM_STATE_RUNNING); // FIXME: this bypass of the checks in suspend() is not nice
531 pimpl->isMigrating = false; // FIXME: this bypass of the checks in suspend() is not nice
532 pimpl->suspend(SIMIX_process_self());
533 sg_vm_stop_dirty_page_tracking(ms->vm);
536 XBT_DEBUG("Stage 3: Gonna send %zu bytes", remaining_size);
537 send_migration_data(ms->vm, ms->src_pm, ms->dst_pm, remaining_size, ms->mbox, 3, 0, mig_speed, -1);
540 //hostfailure (if you want to know whether this is the SRC or the DST check directly in send_migration_data code)
541 // Stop the dirty page tracking an return (there is no memory space to release)
546 // At that point the Migration is considered valid for the SRC node but remind that the DST side should relocate
547 // effectively the VM on the DST node.
548 XBT_DEBUG("mig: tx_done");
553 /** @brief Migrate the VM to the given host.
556 void MSG_vm_migrate(msg_vm_t vm, msg_host_t dst_pm)
559 * - One approach is ...
560 * We first create a new VM (i.e., destination VM) on the destination physical host. The destination VM will
561 * receive the state of the source
562 * VM over network. We will finally destroy the source VM.
563 * - This behavior is similar to the way of migration in the real world.
564 * Even before a migration is completed, we will see a destination VM, consuming resources.
565 * - We have to relocate all processes. The existing process migration code will work for this?
566 * - The name of the VM is a somewhat unique ID in the code. It is tricky for the destination VM?
568 * - Another one is ...
569 * We update the information of the given VM to place it to the destination physical host.
571 * The second one would be easier.
574 msg_host_t src_pm = vm->getPm();
577 THROWF(vm_error, 0, "Cannot migrate VM '%s' from host '%s', which is offline.", vm->getCname(), src_pm->getCname());
579 THROWF(vm_error, 0, "Cannot migrate VM '%s' to host '%s', which is offline.", vm->getCname(), dst_pm->getCname());
580 if (not MSG_vm_is_running(vm))
581 THROWF(vm_error, 0, "Cannot migrate VM '%s' that is not running yet.", vm->getCname());
582 if (vm->isMigrating())
583 THROWF(vm_error, 0, "Cannot migrate VM '%s' that is already migrating.", vm->getCname());
585 vm->pimpl_vm_->isMigrating = true;
587 migration_session ms;
592 /* We have two mailboxes. mbox is used to transfer migration data between source and destination PMs. mbox_ctl is used
593 * to detect the completion of a migration. The names of these mailboxes must not conflict with others. */
595 simgrid::xbt::string_printf("__mbox_mig_ctl:%s(%s-%s)", vm->getCname(), src_pm->getCname(), dst_pm->getCname());
596 ms.mbox = simgrid::xbt::string_printf("__mbox_mig_src_dst:%s(%s-%s)", vm->getCname(), src_pm->getCname(),
599 std::string pr_rx_name = get_mig_process_rx_name(vm, src_pm, dst_pm);
600 std::string pr_tx_name = get_mig_process_tx_name(vm, src_pm, dst_pm);
602 MSG_process_create(pr_rx_name.c_str(), migration_rx_fun, &ms, dst_pm);
604 MSG_process_create(pr_tx_name.c_str(), migration_tx_fun, &ms, src_pm);
606 /* wait until the migration have finished or on error has occurred */
607 XBT_DEBUG("wait for reception of the final ACK (i.e. migration has been correctly performed");
608 msg_task_t task = nullptr;
609 msg_error_t ret = MSG_task_receive(&task, ms.mbox_ctl.c_str());
611 vm->pimpl_vm_->isMigrating = false;
613 if (ret == MSG_HOST_FAILURE) {
614 // Note that since the communication failed, the owner did not change and the task should be destroyed on the
615 // other side. Hence, just throw the execption
616 XBT_ERROR("SRC crashes, throw an exception (m-control)");
617 // MSG_process_kill(tx_process); // Adrien, I made a merge on Nov 28th 2014, I'm not sure whether this line is
619 THROWF(host_error, 0, "Source host '%s' failed during the migration of VM '%s'.", src_pm->getCname(),
621 } else if ((ret == MSG_TRANSFER_FAILURE) || (ret == MSG_TIMEOUT)) {
622 // MSG_TIMEOUT here means that MSG_host_is_avail() returned false.
623 XBT_ERROR("DST crashes, throw an exception (m-control)");
624 THROWF(host_error, 0, "Destination host '%s' failed during the migration of VM '%s'.", dst_pm->getCname(),
628 xbt_assert(get_mig_task_name(vm, src_pm, dst_pm, 4) == task->name);
629 MSG_task_destroy(task);
632 /** @brief Immediately suspend the execution of all processes within the given VM.
635 * This function stops the execution of the VM. All the processes on this VM
636 * will pause. The state of the VM is preserved. We can later resume it again.
638 * No suspension cost occurs.
640 void MSG_vm_suspend(msg_vm_t vm)
643 if (TRACE_msg_vm_is_enabled()) {
644 simgrid::instr::StateType* state = simgrid::instr::Container::byName(vm->getName())->getState("MSG_VM_STATE");
645 state->addEntityValue("suspend", "1 0 0"); // suspend is red
646 state->pushEvent("suspend");
650 /** @brief Resume the execution of the VM. All processes on the VM run again.
653 * No resume cost occurs.
655 void MSG_vm_resume(msg_vm_t vm)
658 if (TRACE_msg_vm_is_enabled())
659 simgrid::instr::Container::byName(vm->getName())->getState("MSG_VM_STATE")->popEvent();
662 /** @brief Get the physical host of a given VM.
665 msg_host_t MSG_vm_get_pm(msg_vm_t vm)
670 void MSG_vm_set_bound(msg_vm_t vm, double bound)