1 /* Copyright (c) 2012-2015. 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. */
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 "src/instr/instr_private.h"
15 #include "src/msg/msg_private.h"
16 #include "src/plugins/vm/VirtualMachineImpl.hpp"
17 #include "src/plugins/vm/VmHostExt.hpp"
19 #include "simgrid/host.h"
20 #include "simgrid/simix.hpp"
24 double prev_remaining;
27 typedef struct dirty_page s_dirty_page;
28 typedef struct dirty_page* dirty_page_t;
30 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_vm, msg, "Cloud-oriented parts of the MSG API");
32 /* **** ******** GENERAL ********* **** */
34 /** \ingroup m_vm_management
35 * \brief Set the parameters of a given host
38 * \param params a parameter object
40 void MSG_vm_set_params(msg_vm_t vm, vm_params_t params)
42 static_cast<simgrid::s4u::VirtualMachine*>(vm)->setParameters(params);
45 /** \ingroup m_vm_management
46 * \brief Get the parameters of a given host
48 * \param vm the vm you are interested into
49 * \param params a prameter object
51 void MSG_vm_get_params(msg_vm_t vm, vm_params_t params)
53 static_cast<simgrid::s4u::VirtualMachine*>(vm)->parameters(params);
56 /* **** Check state of a VM **** */
57 static inline int __MSG_vm_is_state(msg_vm_t vm, e_surf_vm_state_t state)
59 return static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->getState() == state;
62 /** @brief Returns whether the given VM has just created, not running.
65 int MSG_vm_is_created(msg_vm_t vm)
67 return __MSG_vm_is_state(vm, SURF_VM_STATE_CREATED);
70 /** @brief Returns whether the given VM is currently running
73 int MSG_vm_is_running(msg_vm_t vm)
75 return __MSG_vm_is_state(vm, SURF_VM_STATE_RUNNING);
78 /** @brief Returns whether the given VM is currently migrating
81 int MSG_vm_is_migrating(msg_vm_t vm)
83 return static_cast<simgrid::s4u::VirtualMachine*>(vm)->isMigrating();
86 /** @brief Returns whether the given VM is currently suspended, not running.
89 int MSG_vm_is_suspended(msg_vm_t vm)
91 return __MSG_vm_is_state(vm, SURF_VM_STATE_SUSPENDED);
94 /* **** ******** MSG vm actions ********* **** */
95 /** @brief Create a new VM with specified parameters.
97 * @param pm Physical machine that will host the VM
98 * @param name Must be unique
99 * @param ramsize [TODO]
100 * @param mig_netspeed Amount of Mbyte/s allocated to the migration (cannot be larger than net_cap). Use 0 if unsure.
101 * @param dp_intensity Dirty page percentage according to migNetSpeed, [0-100]. Use 0 if unsure.
103 msg_vm_t MSG_vm_create(msg_host_t pm, const char* name, int ramsize, int mig_netspeed, int dp_intensity)
105 simgrid::vm::VmHostExt::ensureVmExtInstalled();
107 /* For the moment, intensity_rate is the percentage against the migration bandwidth */
108 double host_speed = MSG_host_get_speed(pm);
109 double update_speed = ((double)dp_intensity/100) * mig_netspeed;
111 msg_vm_t vm = MSG_vm_create_core(pm, name);
112 s_vm_params_t params;
113 memset(¶ms, 0, sizeof(params));
114 params.ramsize = (sg_size_t)ramsize * 1024 * 1024;
116 params.skip_stage2 = 0;
117 params.max_downtime = 0.03;
118 params.dp_rate = (update_speed * 1024 * 1024) / host_speed;
119 params.dp_cap = params.ramsize * 0.9; // assume working set memory is 90% of ramsize
120 params.mig_speed = (double)mig_netspeed * 1024 * 1024; // mig_speed
122 XBT_DEBUG("dp rate %f migspeed : %f intensity mem : %d, updatespeed %f, hostspeed %f", params.dp_rate,
123 params.mig_speed, dp_intensity, update_speed, host_speed);
124 static_cast<simgrid::s4u::VirtualMachine*>(vm)->setParameters(¶ms);
129 /** @brief Create a new VM object. The VM is not yet started. The resource of the VM is allocated upon MSG_vm_start().
132 * A VM is treated as a host. The name of the VM must be unique among all hosts.
134 msg_vm_t MSG_vm_create_core(msg_host_t pm, const char* name)
136 xbt_assert(sg_host_by_name(name) == nullptr,
137 "Cannot create a VM named %s: this name is already used by an host or a VM", name);
139 return new simgrid::s4u::VirtualMachine(name, pm);
142 /** @brief Destroy a VM. Destroy the VM object from the simulation.
145 void MSG_vm_destroy(msg_vm_t vm)
147 if (MSG_vm_is_migrating(vm))
148 THROWF(vm_error, 0, "Cannot destroy VM '%s', which is migrating.", vm->cname());
150 /* First, terminate all processes on the VM if necessary */
151 if (MSG_vm_is_running(vm))
154 xbt_assert(MSG_vm_is_created(vm), "shutdown the given VM before destroying it");
156 /* Then, destroy the VM object */
157 simgrid::simix::kernelImmediate([vm]() {
161 if (TRACE_msg_vm_is_enabled()) {
162 container_t container = PJ_container_get(vm->cname());
163 PJ_container_remove_from_parent(container);
164 PJ_container_free(container);
168 /** @brief Start a vm (i.e., boot the guest operating system)
171 * If the VM cannot be started (because of memory overprovisionning), an exception is generated.
173 void MSG_vm_start(msg_vm_t vm)
175 simgrid::simix::kernelImmediate([vm]() {
176 simgrid::vm::VmHostExt::ensureVmExtInstalled();
178 simgrid::s4u::VirtualMachine* typedVM = static_cast<simgrid::s4u::VirtualMachine*>(vm);
179 simgrid::s4u::Host* pm = typedVM->pimpl_vm_->getPm();
180 if (pm->extension<simgrid::vm::VmHostExt>() == nullptr)
181 pm->extension_set(new simgrid::vm::VmHostExt());
183 long pm_ramsize = pm->extension<simgrid::vm::VmHostExt>()->ramsize;
184 int pm_overcommit = pm->extension<simgrid::vm::VmHostExt>()->overcommit;
185 long vm_ramsize = typedVM->getRamsize();
187 if (pm_ramsize && !pm_overcommit) { /* Only verify that we don't overcommit on need */
188 /* Retrieve the memory occupied by the VMs on that host. Yep, we have to traverse all VMs of all hosts for that */
189 long total_ramsize_of_vms = 0;
190 for (simgrid::s4u::VirtualMachine* ws_vm : simgrid::vm::VirtualMachineImpl::allVms_)
191 if (pm == ws_vm->pimpl_vm_->getPm())
192 total_ramsize_of_vms += ws_vm->pimpl_vm_->getRamsize();
194 if (vm_ramsize > pm_ramsize - total_ramsize_of_vms) {
195 XBT_WARN("cannnot start %s@%s due to memory shortage: vm_ramsize %ld, free %ld, pm_ramsize %ld (bytes).",
196 vm->cname(), pm->cname(), vm_ramsize, pm_ramsize - total_ramsize_of_vms, pm_ramsize);
197 THROWF(vm_error, 0, "Memory shortage on host '%s', VM '%s' cannot be started", pm->cname(), vm->cname());
201 typedVM->pimpl_vm_->setState(SURF_VM_STATE_RUNNING);
204 if (TRACE_msg_vm_is_enabled()) {
205 container_t vm_container = PJ_container_get(vm->cname());
206 type_t type = PJ_type_get("MSG_VM_STATE", vm_container->type);
207 val_t value = PJ_value_get_or_new("start", "0 0 1", type); // start is blue
208 new_pajePushState(MSG_get_clock(), vm_container, type, value);
212 /** @brief Immediately kills all processes within the given VM.
215 * Any memory that they allocated will be leaked, unless you used #MSG_process_on_exit().
217 * No extra delay occurs. If you want to simulate this too, you want to use a #MSG_process_sleep().
219 void MSG_vm_shutdown(msg_vm_t vm)
221 smx_actor_t issuer=SIMIX_process_self();
222 simgrid::simix::kernelImmediate([vm,issuer]() {
223 static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->shutdown(issuer);
226 // Make sure that the processes in the VM are killed in this scheduling round before processing
227 // (eg with the VM destroy)
228 MSG_process_sleep(0.);
231 static inline char *get_mig_process_tx_name(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm)
233 return bprintf("__pr_mig_tx:%s(%s-%s)", vm->cname(), src_pm->cname(), dst_pm->cname());
236 static inline char *get_mig_process_rx_name(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm)
238 return bprintf("__pr_mig_rx:%s(%s-%s)", vm->cname(), src_pm->cname(), dst_pm->cname());
241 static inline char *get_mig_task_name(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm, int stage)
243 return bprintf("__task_mig_stage%d:%s(%s-%s)", stage, vm->cname(), src_pm->cname(), dst_pm->cname());
246 struct migration_session {
251 /* The miration_rx process uses mbox_ctl to let the caller of do_migration()
252 * know the completion of the migration. */
254 /* The migration_rx and migration_tx processes use mbox to transfer migration data. */
258 static int migration_rx_fun(int argc, char *argv[])
260 XBT_DEBUG("mig: rx_start");
262 // The structure has been created in the do_migration function and should only be freed in the same place ;)
263 struct migration_session *ms = (migration_session *) MSG_process_get_data(MSG_process_self());
265 bool received_finalize = false;
267 char *finalize_task_name = get_mig_task_name(ms->vm, ms->src_pm, ms->dst_pm, 3);
268 while (!received_finalize) {
269 msg_task_t task = nullptr;
270 int ret = MSG_task_recv(&task, ms->mbox);
273 // An error occurred, clean the code and return
274 // The owner did not change, hence the task should be only destroyed on the other side
275 xbt_free(finalize_task_name);
279 if (strcmp(task->name, finalize_task_name) == 0)
280 received_finalize = 1;
282 MSG_task_destroy(task);
284 xbt_free(finalize_task_name);
286 // Here Stage 1, 2 and 3 have been performed.
287 // Hence complete the migration
289 // Copy the reference to the vm (if SRC crashes now, do_migration will free ms)
290 // This is clearly ugly but I (Adrien) need more time to do something cleaner (actually we should copy the whole ms
291 // structure at the beginning and free it at the end of each function)
292 simgrid::s4u::VirtualMachine* vm = static_cast<simgrid::s4u::VirtualMachine*>(ms->vm);
293 msg_host_t dst_pm = ms->dst_pm;
295 // Make sure that we cannot get interrupted between the migrate and the resume to not end in an inconsistent state
296 simgrid::simix::kernelImmediate([vm, dst_pm]() {
297 /* Update the vm location */
298 /* precopy migration makes the VM temporally paused */
299 xbt_assert(vm->pimpl_vm_->getState() == SURF_VM_STATE_SUSPENDED);
301 /* Update the vm location and resume it */
302 vm->pimpl_vm_->setPm(dst_pm);
303 vm->pimpl_vm_->resume();
307 // Now the VM is running on the new host (the migration is completed) (even if the SRC crash)
308 vm->pimpl_vm_->isMigrating = false;
309 XBT_DEBUG("VM(%s) moved from PM(%s) to PM(%s)", ms->vm->cname(), ms->src_pm->cname(), ms->dst_pm->cname());
311 if (TRACE_msg_vm_is_enabled()) {
312 static long long int counter = 0;
313 char key[INSTR_DEFAULT_STR_SIZE];
314 snprintf(key, INSTR_DEFAULT_STR_SIZE, "%lld", counter++);
317 container_t msg = PJ_container_get(vm->cname());
318 type_t type = PJ_type_get("MSG_VM_LINK", PJ_type_get_root());
319 new_pajeStartLink(MSG_get_clock(), PJ_container_get_root(), type, msg, "M", key);
321 // destroy existing container of this vm
322 container_t existing_container = PJ_container_get(vm->cname());
323 PJ_container_remove_from_parent(existing_container);
324 PJ_container_free(existing_container);
326 // create new container on the new_host location
327 PJ_container_new(vm->cname(), INSTR_MSG_VM, PJ_container_get(ms->dst_pm->cname()));
330 msg = PJ_container_get(vm->cname());
331 type = PJ_type_get("MSG_VM_LINK", PJ_type_get_root());
332 new_pajeEndLink(MSG_get_clock(), PJ_container_get_root(), type, msg, "M", key);
335 // Inform the SRC that the migration has been correctly performed
337 char *task_name = get_mig_task_name(ms->vm, ms->src_pm, ms->dst_pm, 4);
338 msg_task_t task = MSG_task_create(task_name, 0, 0, nullptr);
339 msg_error_t ret = MSG_task_send(task, ms->mbox_ctl);
340 // xbt_assert(ret == MSG_OK);
341 if(ret == MSG_HOST_FAILURE){
342 // The DST has crashed, this is a problem has the VM since we are not sure whether SRC is considering that the VM
343 // has been correctly migrated on the DST node
344 // TODO What does it mean ? What should we do ?
345 MSG_task_destroy(task);
346 } else if(ret == MSG_TRANSFER_FAILURE){
347 // The SRC has crashed, this is not a problem has the VM has been correctly migrated on the DST node
348 MSG_task_destroy(task);
353 XBT_DEBUG("mig: rx_done");
357 static void start_dirty_page_tracking(msg_vm_t vm)
359 simgrid::vm::VirtualMachineImpl* pimpl = static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_;
361 pimpl->dp_enabled = 1;
366 xbt_dict_cursor_t cursor = nullptr;
367 dirty_page_t dp = nullptr;
368 xbt_dict_foreach (pimpl->dp_objs, cursor, key, dp) {
369 double remaining = MSG_task_get_flops_amount(dp->task);
370 dp->prev_clock = MSG_get_clock();
371 dp->prev_remaining = remaining;
373 // XBT_INFO("%s@%s remaining %f", key, sg_host_name(vm), remaining);
377 static void stop_dirty_page_tracking(msg_vm_t vm)
379 static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->dp_enabled = 0;
382 static double get_computed(char *key, msg_vm_t vm, dirty_page_t dp, double remaining, double clock)
384 double computed = dp->prev_remaining - remaining;
385 double duration = clock - dp->prev_clock;
387 XBT_DEBUG("%s@%s: computed %f ops (remaining %f -> %f) in %f secs (%f -> %f)", key, vm->cname(), computed,
388 dp->prev_remaining, remaining, duration, dp->prev_clock, clock);
393 static double lookup_computed_flop_counts(msg_vm_t vm, int stage_for_fancy_debug, int stage2_round_for_fancy_debug)
395 simgrid::vm::VirtualMachineImpl* pimpl = static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_;
399 xbt_dict_cursor_t cursor = nullptr;
400 dirty_page_t dp = nullptr;
401 xbt_dict_foreach (pimpl->dp_objs, cursor, key, dp) {
402 double remaining = MSG_task_get_flops_amount(dp->task);
404 double clock = MSG_get_clock();
406 // total += calc_updated_pages(key, vm, dp, remaining, clock);
407 total += get_computed(key, vm, dp, remaining, clock);
409 dp->prev_remaining = remaining;
410 dp->prev_clock = clock;
413 total += pimpl->dp_updated_by_deleted_tasks;
415 XBT_DEBUG("mig-stage%d.%d: computed %f flop_counts (including %f by deleted tasks)", stage_for_fancy_debug,
416 stage2_round_for_fancy_debug, total, pimpl->dp_updated_by_deleted_tasks);
418 pimpl->dp_updated_by_deleted_tasks = 0;
423 // TODO Is this code redundant with the information provided by
424 // msg_process_t MSG_process_create(const char *name, xbt_main_func_t code, void *data, msg_host_t host)
425 /** @brief take care of the dirty page tracking, in case we're adding a task to a migrating VM */
426 void MSG_host_add_task(msg_host_t host, msg_task_t task)
428 simgrid::s4u::VirtualMachine* vm = dynamic_cast<simgrid::s4u::VirtualMachine*>(host);
431 simgrid::vm::VirtualMachineImpl* pimpl = static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_;
433 double remaining = MSG_task_get_flops_amount(task);
434 char *key = bprintf("%s-%p", task->name, task);
436 dirty_page_t dp = xbt_new0(s_dirty_page, 1);
438 if (pimpl->dp_enabled) {
439 dp->prev_clock = MSG_get_clock();
440 dp->prev_remaining = remaining;
443 pimpl->dp_objs = xbt_dict_new_homogeneous(nullptr);
444 xbt_assert(xbt_dict_get_or_null(pimpl->dp_objs, key) == nullptr);
445 xbt_dict_set(pimpl->dp_objs, key, dp, nullptr);
446 XBT_DEBUG("add %s on %s (remaining %f, dp_enabled %d)", key, host->cname(), remaining, pimpl->dp_enabled);
451 void MSG_host_del_task(msg_host_t host, msg_task_t task)
453 simgrid::s4u::VirtualMachine* vm = dynamic_cast<simgrid::s4u::VirtualMachine*>(host);
456 simgrid::vm::VirtualMachineImpl* pimpl = static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_;
458 char *key = bprintf("%s-%p", task->name, task);
459 dirty_page_t dp = (dirty_page_t)(pimpl->dp_objs ? xbt_dict_get_or_null(pimpl->dp_objs, key) : NULL);
460 xbt_assert(dp->task == task);
462 /* If we are in the middle of dirty page tracking, we record how much computation has been done until now, and keep
463 * the information for the lookup_() function that will called soon. */
464 if (pimpl->dp_enabled) {
465 double remaining = MSG_task_get_flops_amount(task);
466 double clock = MSG_get_clock();
467 // double updated = calc_updated_pages(key, host, dp, remaining, clock);
468 double updated = get_computed(key, host, dp, remaining, clock);
470 pimpl->dp_updated_by_deleted_tasks += updated;
473 xbt_dict_remove(pimpl->dp_objs, key);
476 XBT_DEBUG("del %s on %s", key, host->cname());
480 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, char* mbox,
481 int stage, int stage2_round, double mig_speed, double timeout)
484 char *task_name = get_mig_task_name(vm, src_pm, dst_pm, stage);
485 msg_task_t task = MSG_task_create(task_name, 0, (double)size, nullptr);
489 double clock_sta = MSG_get_clock();
493 ret = MSG_task_send_with_timeout_bounded(task, mbox, timeout, mig_speed);
495 ret = MSG_task_send(task, mbox);
501 } else if (ret == MSG_TIMEOUT) {
502 sg_size_t remaining = (sg_size_t)MSG_task_get_remaining_communication(task);
503 sent = size - remaining;
504 XBT_VERB("timeout (%lf s) in sending_migration_data, remaining %llu bytes of %llu", timeout, remaining, size);
507 /* FIXME: why try-and-catch is used here? */
508 if(ret == MSG_HOST_FAILURE){
509 //XBT_DEBUG("SRC host failed during migration of %s (stage %d)", sg_host_name(vm), stage);
510 MSG_task_destroy(task);
511 THROWF(host_error, 0, "SRC host failed during migration of %s (stage %d)", vm->cname(), stage);
512 }else if(ret == MSG_TRANSFER_FAILURE){
513 //XBT_DEBUG("DST host failed during migration of %s (stage %d)", sg_host_name(vm), stage);
514 MSG_task_destroy(task);
515 THROWF(host_error, 0, "DST host failed during migration of %s (stage %d)", vm->cname(), stage);
518 double clock_end = MSG_get_clock();
519 double duration = clock_end - clock_sta;
520 double actual_speed = size / duration;
523 XBT_DEBUG("mig-stage%d.%d: sent %llu duration %f actual_speed %f (target %f)", stage, stage2_round, size, duration,
524 actual_speed, mig_speed);
526 XBT_DEBUG("mig-stage%d: sent %llu duration %f actual_speed %f (target %f)", stage, size, duration, actual_speed,
532 static sg_size_t get_updated_size(double computed, double dp_rate, double dp_cap)
534 double updated_size = computed * dp_rate;
535 XBT_DEBUG("updated_size %f dp_rate %f", updated_size, dp_rate);
536 if (updated_size > dp_cap) {
537 // XBT_INFO("mig-stage2.%d: %f bytes updated, but cap it with the working set size %f", stage2_round, updated_size,
539 updated_size = dp_cap;
542 return (sg_size_t) updated_size;
545 static int migration_tx_fun(int argc, char *argv[])
547 XBT_DEBUG("mig: tx_start");
549 // Note that the ms structure has been allocated in do_migration and hence should be freed in the same function ;)
550 migration_session *ms = (migration_session *) MSG_process_get_data(MSG_process_self());
552 s_vm_params_t params;
553 static_cast<simgrid::s4u::VirtualMachine*>(ms->vm)->parameters(¶ms);
554 const sg_size_t ramsize = params.ramsize;
555 const sg_size_t devsize = params.devsize;
556 const int skip_stage1 = params.skip_stage1;
557 int skip_stage2 = params.skip_stage2;
558 const double dp_rate = params.dp_rate;
559 const double dp_cap = params.dp_cap;
560 const double mig_speed = params.mig_speed;
561 double max_downtime = params.max_downtime;
563 double mig_timeout = 10000000.0;
565 double remaining_size = (double) (ramsize + devsize);
566 double threshold = 0.0;
568 /* check parameters */
570 XBT_WARN("migrate a VM, but ramsize is zero");
572 if (max_downtime <= 0) {
573 XBT_WARN("use the default max_downtime value 30ms");
577 /* Stage1: send all memory pages to the destination. */
578 XBT_DEBUG("mig-stage1: remaining_size %f", remaining_size);
579 start_dirty_page_tracking(ms->vm);
581 double computed_during_stage1 = 0;
583 double clock_prev_send = MSG_get_clock();
586 /* At stage 1, we do not need timeout. We have to send all the memory pages even though the duration of this
587 * transfer exceeds the timeout value. */
588 XBT_VERB("Stage 1: Gonna send %llu", ramsize);
589 sg_size_t sent = send_migration_data(ms->vm, ms->src_pm, ms->dst_pm, ramsize, ms->mbox, 1, 0, mig_speed, -1);
590 remaining_size -= sent;
591 computed_during_stage1 = lookup_computed_flop_counts(ms->vm, 1, 0);
593 if (sent < ramsize) {
594 XBT_VERB("mig-stage1: timeout, force moving to stage 3");
596 } else if (sent > ramsize)
601 //hostfailure (if you want to know whether this is the SRC or the DST check directly in send_migration_data code)
602 // Stop the dirty page tracking an return (there is no memory space to release)
603 stop_dirty_page_tracking(ms->vm);
607 double clock_post_send = MSG_get_clock();
608 mig_timeout -= (clock_post_send - clock_prev_send);
609 if (mig_timeout < 0) {
610 XBT_VERB("The duration of stage 1 exceeds the timeout value, skip stage 2");
614 /* estimate bandwidth */
615 double bandwidth = ramsize / (clock_post_send - clock_prev_send);
616 threshold = bandwidth * max_downtime;
617 XBT_DEBUG("actual bandwidth %f (MB/s), threshold %f", bandwidth / 1024 / 1024, threshold);
621 /* Stage2: send update pages iteratively until the size of remaining states becomes smaller than threshold value. */
624 int stage2_round = 0;
627 sg_size_t updated_size = 0;
628 if (stage2_round == 0) {
629 /* just after stage1, nothing has been updated. But, we have to send the data updated during stage1 */
630 updated_size = get_updated_size(computed_during_stage1, dp_rate, dp_cap);
632 double computed = lookup_computed_flop_counts(ms->vm, 2, stage2_round);
633 updated_size = get_updated_size(computed, dp_rate, dp_cap);
636 XBT_DEBUG("mig-stage 2:%d updated_size %llu computed_during_stage1 %f dp_rate %f dp_cap %f", stage2_round,
637 updated_size, computed_during_stage1, dp_rate, dp_cap);
639 /* Check whether the remaining size is below the threshold value. If so, move to stage 3. */
640 remaining_size += updated_size;
641 XBT_DEBUG("mig-stage2.%d: remaining_size %f (%s threshold %f)", stage2_round, remaining_size,
642 (remaining_size < threshold) ? "<" : ">", threshold);
643 if (remaining_size < threshold)
647 double clock_prev_send = MSG_get_clock();
649 XBT_DEBUG("Stage 2, gonna send %llu", updated_size);
650 sent = send_migration_data(ms->vm, ms->src_pm, ms->dst_pm, updated_size, ms->mbox, 2, stage2_round, mig_speed,
652 } catch (xbt_ex& e) {
653 // hostfailure (if you want to know whether this is the SRC or the DST check directly in send_migration_data
655 // Stop the dirty page tracking an return (there is no memory space to release)
656 stop_dirty_page_tracking(ms->vm);
659 double clock_post_send = MSG_get_clock();
661 if (sent == updated_size) {
662 /* timeout did not happen */
663 double bandwidth = updated_size / (clock_post_send - clock_prev_send);
664 threshold = bandwidth * max_downtime;
665 XBT_DEBUG("actual bandwidth %f, threshold %f", bandwidth / 1024 / 1024, threshold);
666 remaining_size -= sent;
668 mig_timeout -= (clock_post_send - clock_prev_send);
669 xbt_assert(mig_timeout > 0);
671 } else if (sent < updated_size) {
672 /* When timeout happens, we move to stage 3. The size of memory pages
673 * updated before timeout must be added to the remaining size. */
674 XBT_VERB("mig-stage2.%d: timeout, force moving to stage 3. sent %llu / %llu, eta %lf", stage2_round, sent,
675 updated_size, (clock_post_send - clock_prev_send));
676 remaining_size -= sent;
678 double computed = lookup_computed_flop_counts(ms->vm, 2, stage2_round);
679 updated_size = get_updated_size(computed, dp_rate, dp_cap);
680 remaining_size += updated_size;
687 /* Stage3: stop the VM and copy the rest of states. */
688 XBT_DEBUG("mig-stage3: remaining_size %f", remaining_size);
689 simgrid::vm::VirtualMachineImpl* pimpl = static_cast<simgrid::s4u::VirtualMachine*>(ms->vm)->pimpl_vm_;
690 pimpl->setState(SURF_VM_STATE_RUNNING); // FIXME: this bypass of the checks in suspend() is not nice
691 pimpl->isMigrating = false; // FIXME: this bypass of the checks in suspend() is not nice
692 pimpl->suspend(SIMIX_process_self());
693 stop_dirty_page_tracking(ms->vm);
696 XBT_DEBUG("Stage 3: Gonna send %f", remaining_size);
697 send_migration_data(ms->vm, ms->src_pm, ms->dst_pm, (sg_size_t)remaining_size, ms->mbox, 3, 0, mig_speed, -1);
700 //hostfailure (if you want to know whether this is the SRC or the DST check directly in send_migration_data code)
701 // Stop the dirty page tracking an return (there is no memory space to release)
702 static_cast<simgrid::s4u::VirtualMachine*>(ms->vm)->pimpl_vm_->resume();
706 // At that point the Migration is considered valid for the SRC node but remind that the DST side should relocate
707 // effectively the VM on the DST node.
708 XBT_DEBUG("mig: tx_done");
713 /** @brief Migrate the VM to the given host.
716 void MSG_vm_migrate(msg_vm_t vm, msg_host_t dst_pm)
719 * - One approach is ...
720 * We first create a new VM (i.e., destination VM) on the destination physical host. The destination VM will
721 * receive the state of the source
722 * VM over network. We will finally destroy the source VM.
723 * - This behavior is similar to the way of migration in the real world.
724 * Even before a migration is completed, we will see a destination VM, consuming resources.
725 * - We have to relocate all processes. The existing process migration code will work for this?
726 * - The name of the VM is a somewhat unique ID in the code. It is tricky for the destination VM?
728 * - Another one is ...
729 * We update the information of the given VM to place it to the destination physical host.
731 * The second one would be easier.
734 simgrid::s4u::VirtualMachine* typedVm = static_cast<simgrid::s4u::VirtualMachine*>(vm);
735 simgrid::vm::VirtualMachineImpl* pimpl = typedVm->pimpl_vm_;
736 msg_host_t src_pm = pimpl->getPm();
739 THROWF(vm_error, 0, "Cannot migrate VM '%s' from host '%s', which is offline.", vm->cname(), src_pm->cname());
741 THROWF(vm_error, 0, "Cannot migrate VM '%s' to host '%s', which is offline.", vm->cname(), dst_pm->cname());
742 if (!MSG_vm_is_running(vm))
743 THROWF(vm_error, 0, "Cannot migrate VM '%s' that is not running yet.", vm->cname());
744 if (typedVm->isMigrating())
745 THROWF(vm_error, 0, "Cannot migrate VM '%s' that is already migrating.", vm->cname());
747 pimpl->isMigrating = true;
749 struct migration_session *ms = xbt_new(struct migration_session, 1);
754 /* We have two mailboxes. mbox is used to transfer migration data between source and destination PMs. mbox_ctl is used
755 * to detect the completion of a migration. The names of these mailboxes must not conflict with others. */
756 ms->mbox_ctl = bprintf("__mbox_mig_ctl:%s(%s-%s)", vm->cname(), src_pm->cname(), dst_pm->cname());
757 ms->mbox = bprintf("__mbox_mig_src_dst:%s(%s-%s)", vm->cname(), src_pm->cname(), dst_pm->cname());
759 char *pr_rx_name = get_mig_process_rx_name(vm, src_pm, dst_pm);
760 char *pr_tx_name = get_mig_process_tx_name(vm, src_pm, dst_pm);
762 char** argv = xbt_new(char*, 2);
763 argv[0] = pr_rx_name;
765 MSG_process_create_with_arguments(pr_rx_name, migration_rx_fun, ms, dst_pm, 1, argv);
767 argv = xbt_new(char*, 2);
768 argv[0] = pr_tx_name;
770 MSG_process_create_with_arguments(pr_tx_name, migration_tx_fun, ms, src_pm, 1, argv);
772 /* wait until the migration have finished or on error has occurred */
773 XBT_DEBUG("wait for reception of the final ACK (i.e. migration has been correctly performed");
774 msg_task_t task = nullptr;
775 msg_error_t ret = MSG_TIMEOUT;
776 while (ret == MSG_TIMEOUT && dst_pm->isOn()) // The rx will tell me when he gots the VM
777 ret = MSG_task_receive_with_timeout(&task, ms->mbox_ctl, 4);
779 pimpl->isMigrating = false;
781 xbt_free(ms->mbox_ctl);
785 if (ret == MSG_HOST_FAILURE) {
786 // Note that since the communication failed, the owner did not change and the task should be destroyed on the
787 // other side. Hence, just throw the execption
788 XBT_ERROR("SRC crashes, throw an exception (m-control)");
789 // MSG_process_kill(tx_process); // Adrien, I made a merge on Nov 28th 2014, I'm not sure whether this line is
791 THROWF(host_error, 0, "Source host '%s' failed during the migration of VM '%s'.", src_pm->cname(), vm->cname());
792 } else if ((ret == MSG_TRANSFER_FAILURE) || (ret == MSG_TIMEOUT)) {
793 // MSG_TIMEOUT here means that MSG_host_is_avail() returned false.
794 XBT_ERROR("DST crashes, throw an exception (m-control)");
795 THROWF(host_error, 0, "Destination host '%s' failed during the migration of VM '%s'.", dst_pm->cname(),
799 char* expected_task_name = get_mig_task_name(vm, src_pm, dst_pm, 4);
800 xbt_assert(strcmp(task->name, expected_task_name) == 0);
801 xbt_free(expected_task_name);
802 MSG_task_destroy(task);
805 /** @brief Immediately suspend the execution of all processes within the given VM.
808 * This function stops the execution of the VM. All the processes on this VM
809 * will pause. The state of the VM is preserved. We can later resume it again.
811 * No suspension cost occurs.
813 void MSG_vm_suspend(msg_vm_t vm)
815 smx_actor_t issuer = SIMIX_process_self();
816 simgrid::simix::kernelImmediate([vm,issuer]() {
817 static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->suspend(issuer);
820 XBT_DEBUG("vm_suspend done");
822 if (TRACE_msg_vm_is_enabled()) {
823 container_t vm_container = PJ_container_get(vm->cname());
824 type_t type = PJ_type_get("MSG_VM_STATE", vm_container->type);
825 val_t value = PJ_value_get_or_new("suspend", "1 0 0", type); // suspend is red
826 new_pajePushState(MSG_get_clock(), vm_container, type, value);
830 /** @brief Resume the execution of the VM. All processes on the VM run again.
833 * No resume cost occurs.
835 void MSG_vm_resume(msg_vm_t vm)
837 static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->resume();
839 if (TRACE_msg_vm_is_enabled()) {
840 container_t vm_container = PJ_container_get(vm->cname());
841 type_t type = PJ_type_get("MSG_VM_STATE", vm_container->type);
842 new_pajePopState(MSG_get_clock(), vm_container, type);
846 /** @brief Get the physical host of a given VM.
849 msg_host_t MSG_vm_get_pm(msg_vm_t vm)
851 return static_cast<simgrid::s4u::VirtualMachine*>(vm)->pm();
854 /** @brief Set a CPU bound for a given VM.
857 * 1. Note that in some cases MSG_task_set_bound() may not intuitively work for VMs.
860 * On PM0, there are Task1 and VM0.
861 * On VM0, there is Task2.
862 * Now we bound 75% to Task1\@PM0 and bound 25% to Task2\@VM0.
864 * Task1\@PM0 gets 50%.
865 * Task2\@VM0 gets 25%.
866 * This is NOT 75% for Task1\@PM0 and 25% for Task2\@VM0, respectively.
868 * This is because a VM has the dummy CPU action in the PM layer. Putting a task on the VM does not affect the bound of
869 * the dummy CPU action. The bound of the dummy CPU action is unlimited.
871 * There are some solutions for this problem. One option is to update the bound of the dummy CPU action automatically.
872 * It should be the sum of all tasks on the VM. But, this solution might be costly, because we have to scan all tasks
873 * on the VM in share_resource() or we have to trap both the start and end of task execution.
875 * The current solution is to use MSG_vm_set_bound(), which allows us to directly set the bound of the dummy CPU action.
877 * 2. Note that bound == 0 means no bound (i.e., unlimited). But, if a host has multiple CPU cores, the CPU share of a
878 * computation task (or a VM) never exceeds the capacity of a CPU core.
880 void MSG_vm_set_bound(msg_vm_t vm, double bound)
882 simgrid::simix::kernelImmediate(
883 [vm, bound]() { static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->setBound(bound); });