#include <xbt/ex.hpp>
+#include "simgrid/plugins/live_migration.h"
#include "src/instr/instr_private.hpp"
-#include "src/msg/msg_private.hpp"
#include "src/plugins/vm/VirtualMachineImpl.hpp"
-#include "src/plugins/vm/VmHostExt.hpp"
#include "simgrid/host.h"
#include "simgrid/simix.hpp"
+#include "xbt/string.hpp"
extern "C" {
-struct s_dirty_page {
- double prev_clock;
- double prev_remaining;
- msg_task_t task;
-};
-typedef s_dirty_page* dirty_page_t;
-
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_vm, msg, "Cloud-oriented parts of the MSG API");
-/* **** ******** GENERAL ********* **** */
const char* MSG_vm_get_name(msg_vm_t vm)
{
return vm->getCname();
}
-/** \ingroup m_vm_management
- * \brief Set the parameters of a given host
- *
- * \param vm a vm
- * \param params a parameter object
+/** @brief Get the physical host of a given VM.
+ * @ingroup msg_VMs
*/
-void MSG_vm_set_params(msg_vm_t vm, vm_params_t params)
+msg_host_t MSG_vm_get_pm(msg_vm_t vm)
{
- vm->setParameters(params);
+ return vm->getPm();
}
-/** \ingroup m_vm_management
- * \brief Get the parameters of a given host
- *
- * \param vm the vm you are interested into
- * \param params a prameter object
- */
-void MSG_vm_get_params(msg_vm_t vm, vm_params_t params)
+void MSG_vm_set_ramsize(msg_vm_t vm, size_t size)
+{
+ vm->setRamsize(size);
+}
+
+size_t MSG_vm_get_ramsize(msg_vm_t vm)
{
- vm->getParameters(params);
+ return vm->getRamsize();
}
-/* **** Check state of a VM **** */
-static inline int __MSG_vm_is_state(msg_vm_t vm, e_surf_vm_state_t state)
+void MSG_vm_set_bound(msg_vm_t vm, double bound)
{
- return vm->pimpl_vm_ != nullptr && vm->pimpl_vm_->getState() == state;
+ vm->setBound(bound);
}
/** @brief Returns whether the given VM has just created, not running.
*/
int MSG_vm_is_created(msg_vm_t vm)
{
- return __MSG_vm_is_state(vm, SURF_VM_STATE_CREATED);
+ return vm->getState() == SURF_VM_STATE_CREATED;
}
/** @brief Returns whether the given VM is currently running
*/
int MSG_vm_is_running(msg_vm_t vm)
{
- return __MSG_vm_is_state(vm, SURF_VM_STATE_RUNNING);
-}
-
-/** @brief Returns whether the given VM is currently migrating
- * @ingroup msg_VMs
- */
-int MSG_vm_is_migrating(msg_vm_t vm)
-{
- return vm->isMigrating();
+ return vm->getState() == SURF_VM_STATE_RUNNING;
}
/** @brief Returns whether the given VM is currently suspended, not running.
*/
int MSG_vm_is_suspended(msg_vm_t vm)
{
- return __MSG_vm_is_state(vm, SURF_VM_STATE_SUSPENDED);
+ return vm->getState() == SURF_VM_STATE_SUSPENDED;
}
/* **** ******** MSG vm actions ********* **** */
-/** @brief Create a new VM with specified parameters.
- * @ingroup msg_VMs*
- * @param pm Physical machine that will host the VM
- * @param name Must be unique
- * @param coreAmount Must be >= 1
- * @param ramsize [TODO]
- * @param mig_netspeed Amount of Mbyte/s allocated to the migration (cannot be larger than net_cap). Use 0 if unsure.
- * @param dp_intensity Dirty page percentage according to migNetSpeed, [0-100]. Use 0 if unsure.
- */
-msg_vm_t MSG_vm_create(msg_host_t pm, const char* name, int coreAmount, int ramsize, int mig_netspeed, int dp_intensity)
-{
- simgrid::vm::VmHostExt::ensureVmExtInstalled();
-
- /* For the moment, intensity_rate is the percentage against the migration bandwidth */
-
- msg_vm_t vm = new simgrid::s4u::VirtualMachine(name, pm, coreAmount);
- s_vm_params_t params{};
- params.ramsize = static_cast<sg_size_t>(ramsize) * 1024 * 1024;
- params.devsize = 0;
- params.skip_stage2 = 0;
- params.max_downtime = 0.03;
- params.mig_speed = static_cast<double>(mig_netspeed) * 1024 * 1024; // mig_speed
- params.dp_intensity = static_cast<double>(dp_intensity) / 100;
- params.dp_cap = params.ramsize * 0.9; // assume working set memory is 90% of ramsize
-
- XBT_DEBUG("migspeed : %f intensity mem : %d", params.mig_speed, dp_intensity);
- vm->setParameters(¶ms);
-
- return vm;
-}
-
/** @brief Create a new VM object with the default parameters
* @ingroup msg_VMs*
*
*/
msg_vm_t MSG_vm_create_core(msg_host_t pm, const char* name)
{
- xbt_assert(sg_host_by_name(name) == nullptr,
- "Cannot create a VM named %s: this name is already used by an host or a VM", name);
-
- return new simgrid::s4u::VirtualMachine(name, pm, 1);
+ return MSG_vm_create_multicore(pm, name, 1);
}
/** @brief Create a new VM object with the default parameters, but with a specified amount of cores
* @ingroup msg_VMs*
return new simgrid::s4u::VirtualMachine(name, pm, coreAmount);
}
-/** @brief Destroy a VM. Destroy the VM object from the simulation.
- * @ingroup msg_VMs
- */
-void MSG_vm_destroy(msg_vm_t vm)
-{
- if (vm->isMigrating())
- THROWF(vm_error, 0, "Cannot destroy VM '%s', which is migrating.", vm->getCname());
-
- /* First, terminate all processes on the VM if necessary */
- if (MSG_vm_is_running(vm))
- MSG_vm_shutdown(vm);
-
- /* Then, destroy the VM object */
- simgrid::simix::kernelImmediate([vm]() { vm->destroy(); });
-
- if (TRACE_msg_vm_is_enabled()) {
- container_t container = simgrid::instr::Container::byName(vm->getName());
- container->removeFromParent();
- delete container;
- }
-}
-
/** @brief Start a vm (i.e., boot the guest operating system)
* @ingroup msg_VMs
*
void MSG_vm_start(msg_vm_t vm)
{
vm->start();
- if (TRACE_msg_vm_is_enabled()) {
- simgrid::instr::StateType* state = simgrid::instr::Container::byName(vm->getName())->getState("MSG_VM_STATE");
- state->addEntityValue("start", "0 0 1"); // start is blue
- state->pushEvent("start");
- }
-}
-
-/** @brief Immediately kills all processes within the given VM.
- * @ingroup msg_VMs
- *
- * Any memory that they allocated will be leaked, unless you used #MSG_process_on_exit().
- *
- * No extra delay occurs. If you want to simulate this too, you want to use a #MSG_process_sleep().
- */
-void MSG_vm_shutdown(msg_vm_t vm)
-{
- smx_actor_t issuer = SIMIX_process_self();
- simgrid::simix::kernelImmediate([vm, issuer]() { vm->pimpl_vm_->shutdown(issuer); });
-
- // Make sure that processes in the VM are killed in this scheduling round before processing (eg with the VM destroy)
- MSG_process_sleep(0.);
-}
-
-static std::string get_mig_process_tx_name(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm)
-{
- return std::string("__pr_mig_tx:") + vm->getCname() + "(" + src_pm->getCname() + "-" + dst_pm->getCname() + ")";
-}
-
-static std::string get_mig_process_rx_name(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm)
-{
- return std::string("__pr_mig_rx:") + vm->getCname() + "(" + src_pm->getCname() + "-" + dst_pm->getCname() + ")";
-}
-
-static std::string get_mig_task_name(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm, int stage)
-{
- return std::string("__task_mig_stage") + std::to_string(stage) + ":" + vm->getCname() + "(" + src_pm->getCname() +
- "-" + dst_pm->getCname() + ")";
-}
-
-struct migration_session {
- msg_vm_t vm;
- msg_host_t src_pm;
- msg_host_t dst_pm;
-
- /* The miration_rx process uses mbox_ctl to let the caller of do_migration()
- * know the completion of the migration. */
- char *mbox_ctl;
- /* The migration_rx and migration_tx processes use mbox to transfer migration data. */
- char *mbox;
-};
-
-static int migration_rx_fun(int argc, char *argv[])
-{
- XBT_DEBUG("mig: rx_start");
-
- // The structure has been created in the do_migration function and should only be freed in the same place ;)
- migration_session* ms = static_cast<migration_session*>(MSG_process_get_data(MSG_process_self()));
-
- bool received_finalize = false;
-
- std::string finalize_task_name = get_mig_task_name(ms->vm, ms->src_pm, ms->dst_pm, 3);
- while (not received_finalize) {
- msg_task_t task = nullptr;
- int ret = MSG_task_recv(&task, ms->mbox);
-
- if (ret != MSG_OK) {
- // An error occurred, clean the code and return
- // The owner did not change, hence the task should be only destroyed on the other side
- return 0;
- }
-
- if (finalize_task_name == task->name)
- received_finalize = 1;
-
- MSG_task_destroy(task);
- }
-
- // Here Stage 1, 2 and 3 have been performed.
- // Hence complete the migration
-
- // Copy the reference to the vm (if SRC crashes now, do_migration will free ms)
- // This is clearly ugly but I (Adrien) need more time to do something cleaner (actually we should copy the whole ms
- // structure at the beginning and free it at the end of each function)
- simgrid::s4u::VirtualMachine* vm = ms->vm;
- msg_host_t dst_pm = ms->dst_pm;
-
- // Make sure that we cannot get interrupted between the migrate and the resume to not end in an inconsistent state
- simgrid::simix::kernelImmediate([vm, dst_pm]() {
- /* Update the vm location */
- /* precopy migration makes the VM temporally paused */
- xbt_assert(vm->pimpl_vm_->getState() == SURF_VM_STATE_SUSPENDED);
-
- /* Update the vm location and resume it */
- vm->pimpl_vm_->setPm(dst_pm);
- vm->pimpl_vm_->resume();
- });
-
-
- // Now the VM is running on the new host (the migration is completed) (even if the SRC crash)
- vm->pimpl_vm_->isMigrating = false;
- XBT_DEBUG("VM(%s) moved from PM(%s) to PM(%s)", ms->vm->getCname(), ms->src_pm->getCname(), ms->dst_pm->getCname());
-
- if (TRACE_msg_vm_is_enabled()) {
- static long long int counter = 0;
- std::string key = std::to_string(counter);
- counter++;
-
- // start link
- container_t msg = simgrid::instr::Container::byName(vm->getName());
- simgrid::instr::Container::getRoot()->getLink("MSG_VM_LINK")->startEvent(msg, "M", key);
-
- // destroy existing container of this vm
- container_t existing_container = simgrid::instr::Container::byName(vm->getName());
- existing_container->removeFromParent();
- delete existing_container;
-
- // create new container on the new_host location
- new simgrid::instr::Container(vm->getCname(), "MSG_VM", simgrid::instr::Container::byName(ms->dst_pm->getName()));
-
- // end link
- msg = simgrid::instr::Container::byName(vm->getName());
- simgrid::instr::Container::getRoot()->getLink("MSG_VM_LINK")->endEvent(msg, "M", key);
- }
-
- // Inform the SRC that the migration has been correctly performed
- std::string task_name = get_mig_task_name(ms->vm, ms->src_pm, ms->dst_pm, 4);
- msg_task_t task = MSG_task_create(task_name.c_str(), 0, 0, nullptr);
- msg_error_t ret = MSG_task_send(task, ms->mbox_ctl);
- if(ret == MSG_HOST_FAILURE){
- // The DST has crashed, this is a problem has the VM since we are not sure whether SRC is considering that the VM
- // has been correctly migrated on the DST node
- // TODO What does it mean ? What should we do ?
- MSG_task_destroy(task);
- } else if(ret == MSG_TRANSFER_FAILURE){
- // The SRC has crashed, this is not a problem has the VM has been correctly migrated on the DST node
- MSG_task_destroy(task);
- }
-
- XBT_DEBUG("mig: rx_done");
- return 0;
-}
-
-static void start_dirty_page_tracking(msg_vm_t vm)
-{
- vm->pimpl_vm_->dp_enabled = 1;
- if (vm->pimpl_vm_->dp_objs.empty())
- return;
-
- for (auto const& elm : vm->pimpl_vm_->dp_objs) {
- dirty_page_t dp = elm.second;
- double remaining = MSG_task_get_flops_amount(dp->task);
- dp->prev_clock = MSG_get_clock();
- dp->prev_remaining = remaining;
- XBT_DEBUG("%s@%s remaining %f", elm.first.c_str(), vm->getCname(), remaining);
- }
-}
-
-static void stop_dirty_page_tracking(msg_vm_t vm)
-{
- vm->pimpl_vm_->dp_enabled = 0;
-}
-
-static double get_computed(const char* key, msg_vm_t vm, dirty_page_t dp, double remaining, double clock)
-{
- double computed = dp->prev_remaining - remaining;
- double duration = clock - dp->prev_clock;
-
- XBT_DEBUG("%s@%s: computed %f ops (remaining %f -> %f) in %f secs (%f -> %f)", key, vm->getCname(), computed,
- dp->prev_remaining, remaining, duration, dp->prev_clock, clock);
-
- return computed;
-}
-
-static double lookup_computed_flop_counts(msg_vm_t vm, int stage_for_fancy_debug, int stage2_round_for_fancy_debug)
-{
- double total = 0;
-
- for (auto const& elm : vm->pimpl_vm_->dp_objs) {
- const char* key = elm.first.c_str();
- dirty_page_t dp = elm.second;
- double remaining = MSG_task_get_flops_amount(dp->task);
-
- double clock = MSG_get_clock();
-
- total += get_computed(key, vm, dp, remaining, clock);
-
- dp->prev_remaining = remaining;
- dp->prev_clock = clock;
- }
-
- total += vm->pimpl_vm_->dp_updated_by_deleted_tasks;
-
- XBT_DEBUG("mig-stage%d.%d: computed %f flop_counts (including %f by deleted tasks)", stage_for_fancy_debug,
- stage2_round_for_fancy_debug, total, vm->pimpl_vm_->dp_updated_by_deleted_tasks);
-
- vm->pimpl_vm_->dp_updated_by_deleted_tasks = 0;
-
- return total;
-}
-
-// TODO Is this code redundant with the information provided by
-// msg_process_t MSG_process_create(const char *name, xbt_main_func_t code, void *data, msg_host_t host)
-/** @brief take care of the dirty page tracking, in case we're adding a task to a migrating VM */
-void MSG_host_add_task(msg_host_t host, msg_task_t task)
-{
- simgrid::s4u::VirtualMachine* vm = dynamic_cast<simgrid::s4u::VirtualMachine*>(host);
- if (vm == nullptr)
- return;
-
- double remaining = MSG_task_get_flops_amount(task);
- char *key = bprintf("%s-%p", task->name, task);
-
- dirty_page_t dp = xbt_new0(s_dirty_page, 1);
- dp->task = task;
- if (vm->pimpl_vm_->dp_enabled) {
- dp->prev_clock = MSG_get_clock();
- dp->prev_remaining = remaining;
- }
- vm->pimpl_vm_->dp_objs.insert({key, dp});
- XBT_DEBUG("add %s on %s (remaining %f, dp_enabled %d)", key, host->getCname(), remaining, vm->pimpl_vm_->dp_enabled);
-
- xbt_free(key);
-}
-
-void MSG_host_del_task(msg_host_t host, msg_task_t task)
-{
- simgrid::s4u::VirtualMachine* vm = dynamic_cast<simgrid::s4u::VirtualMachine*>(host);
- if (vm == nullptr)
- return;
-
- char *key = bprintf("%s-%p", task->name, task);
- dirty_page_t dp = nullptr;
- if (vm->pimpl_vm_->dp_objs.find(key) != vm->pimpl_vm_->dp_objs.end())
- dp = vm->pimpl_vm_->dp_objs.at(key);
- xbt_assert(dp && dp->task == task);
-
- /* If we are in the middle of dirty page tracking, we record how much computation has been done until now, and keep
- * the information for the lookup_() function that will called soon. */
- if (vm->pimpl_vm_->dp_enabled) {
- double remaining = MSG_task_get_flops_amount(task);
- double clock = MSG_get_clock();
- double updated = get_computed(key, vm, dp, remaining, clock); // was host instead of vm
-
- vm->pimpl_vm_->dp_updated_by_deleted_tasks += updated;
- }
-
- vm->pimpl_vm_->dp_objs.erase(key);
- xbt_free(dp);
-
- XBT_DEBUG("del %s on %s", key, host->getCname());
- xbt_free(key);
-}
-
-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,
- int stage, int stage2_round, double mig_speed, double timeout)
-{
- sg_size_t sent = 0;
- std::string task_name = get_mig_task_name(vm, src_pm, dst_pm, stage);
- msg_task_t task = MSG_task_create(task_name.c_str(), 0, static_cast<double>(size), nullptr);
-
- double clock_sta = MSG_get_clock();
-
- msg_error_t ret;
- if (mig_speed > 0)
- ret = MSG_task_send_with_timeout_bounded(task, mbox, timeout, mig_speed);
- else
- ret = MSG_task_send(task, mbox);
-
- if (ret == MSG_OK) {
- sent = size;
- } else if (ret == MSG_TIMEOUT) {
- sg_size_t remaining = static_cast<sg_size_t>(MSG_task_get_remaining_communication(task));
- sent = size - remaining;
- XBT_VERB("timeout (%lf s) in sending_migration_data, remaining %llu bytes of %llu", timeout, remaining, size);
- }
-
- /* FIXME: why try-and-catch is used here? */
- if(ret == MSG_HOST_FAILURE){
- XBT_DEBUG("SRC host failed during migration of %s (stage %d)", vm->getCname(), stage);
- MSG_task_destroy(task);
- THROWF(host_error, 0, "SRC host failed during migration of %s (stage %d)", vm->getCname(), stage);
- }else if(ret == MSG_TRANSFER_FAILURE){
- XBT_DEBUG("DST host failed during migration of %s (stage %d)", vm->getCname(), stage);
- MSG_task_destroy(task);
- THROWF(host_error, 0, "DST host failed during migration of %s (stage %d)", vm->getCname(), stage);
- }
-
- double clock_end = MSG_get_clock();
- double duration = clock_end - clock_sta;
- double actual_speed = size / duration;
-
- if (stage == 2)
- XBT_DEBUG("mig-stage%d.%d: sent %llu duration %f actual_speed %f (target %f)", stage, stage2_round, size, duration,
- actual_speed, mig_speed);
- else
- XBT_DEBUG("mig-stage%d: sent %llu duration %f actual_speed %f (target %f)", stage, size, duration, actual_speed,
- mig_speed);
-
- return sent;
-}
-
-static sg_size_t get_updated_size(double computed, double dp_rate, double dp_cap)
-{
- double updated_size = computed * dp_rate;
- XBT_DEBUG("updated_size %f dp_rate %f", updated_size, dp_rate);
- if (updated_size > dp_cap) {
- updated_size = dp_cap;
- }
-
- return static_cast<sg_size_t>(updated_size);
-}
-
-static int migration_tx_fun(int argc, char *argv[])
-{
- XBT_DEBUG("mig: tx_start");
-
- // Note that the ms structure has been allocated in do_migration and hence should be freed in the same function ;)
- migration_session* ms = static_cast<migration_session*>(MSG_process_get_data(MSG_process_self()));
-
- double host_speed = ms->vm->pimpl_vm_->getPm()->getSpeed();
- s_vm_params_t params;
- ms->vm->getParameters(¶ms);
- const sg_size_t ramsize = params.ramsize;
- const sg_size_t devsize = params.devsize;
- const int skip_stage1 = params.skip_stage1;
- int skip_stage2 = params.skip_stage2;
- const double dp_rate = host_speed ? (params.mig_speed * params.dp_intensity) / host_speed : 1;
- const double dp_cap = params.dp_cap;
- const double mig_speed = params.mig_speed;
- double max_downtime = params.max_downtime;
-
- double mig_timeout = 10000000.0;
-
- double remaining_size = static_cast<double>(ramsize + devsize);
- double threshold = 0.0;
-
- /* check parameters */
- if (ramsize == 0)
- XBT_WARN("migrate a VM, but ramsize is zero");
-
- if (max_downtime <= 0) {
- XBT_WARN("use the default max_downtime value 30ms");
- max_downtime = 0.03;
- }
-
- /* Stage1: send all memory pages to the destination. */
- XBT_DEBUG("mig-stage1: remaining_size %f", remaining_size);
- start_dirty_page_tracking(ms->vm);
-
- double computed_during_stage1 = 0;
- if (not skip_stage1) {
- double clock_prev_send = MSG_get_clock();
-
- try {
- /* At stage 1, we do not need timeout. We have to send all the memory pages even though the duration of this
- * transfer exceeds the timeout value. */
- XBT_VERB("Stage 1: Gonna send %llu bytes", ramsize);
- sg_size_t sent = send_migration_data(ms->vm, ms->src_pm, ms->dst_pm, ramsize, ms->mbox, 1, 0, mig_speed, -1);
- remaining_size -= sent;
- computed_during_stage1 = lookup_computed_flop_counts(ms->vm, 1, 0);
-
- if (sent < ramsize) {
- XBT_VERB("mig-stage1: timeout, force moving to stage 3");
- skip_stage2 = 1;
- } else if (sent > ramsize)
- XBT_CRITICAL("bug");
-
- }
- catch (xbt_ex& e) {
- //hostfailure (if you want to know whether this is the SRC or the DST check directly in send_migration_data code)
- // Stop the dirty page tracking an return (there is no memory space to release)
- stop_dirty_page_tracking(ms->vm);
- return 0;
- }
-
- double clock_post_send = MSG_get_clock();
- mig_timeout -= (clock_post_send - clock_prev_send);
- if (mig_timeout < 0) {
- XBT_VERB("The duration of stage 1 exceeds the timeout value, skip stage 2");
- skip_stage2 = 1;
- }
-
- /* estimate bandwidth */
- double bandwidth = ramsize / (clock_post_send - clock_prev_send);
- threshold = bandwidth * max_downtime;
- XBT_DEBUG("actual bandwidth %f (MB/s), threshold %f", bandwidth / 1024 / 1024, threshold);
- }
-
-
- /* Stage2: send update pages iteratively until the size of remaining states becomes smaller than threshold value. */
- if (not skip_stage2) {
-
- int stage2_round = 0;
- for (;;) {
-
- sg_size_t updated_size = 0;
- if (stage2_round == 0) {
- /* just after stage1, nothing has been updated. But, we have to send the data updated during stage1 */
- updated_size = get_updated_size(computed_during_stage1, dp_rate, dp_cap);
- } else {
- double computed = lookup_computed_flop_counts(ms->vm, 2, stage2_round);
- updated_size = get_updated_size(computed, dp_rate, dp_cap);
- }
-
- XBT_DEBUG("mig-stage 2:%d updated_size %llu computed_during_stage1 %f dp_rate %f dp_cap %f", stage2_round,
- updated_size, computed_during_stage1, dp_rate, dp_cap);
-
- /* Check whether the remaining size is below the threshold value. If so, move to stage 3. */
- remaining_size += updated_size;
- XBT_DEBUG("mig-stage2.%d: remaining_size %f (%s threshold %f)", stage2_round, remaining_size,
- (remaining_size < threshold) ? "<" : ">", threshold);
- if (remaining_size < threshold)
- break;
-
- sg_size_t sent = 0;
- double clock_prev_send = MSG_get_clock();
- try {
- XBT_DEBUG("Stage 2, gonna send %llu", updated_size);
- sent = send_migration_data(ms->vm, ms->src_pm, ms->dst_pm, updated_size, ms->mbox, 2, stage2_round, mig_speed,
- mig_timeout);
- } catch (xbt_ex& e) {
- // hostfailure (if you want to know whether this is the SRC or the DST check directly in send_migration_data
- // code)
- // Stop the dirty page tracking an return (there is no memory space to release)
- stop_dirty_page_tracking(ms->vm);
- return 0;
- }
- double clock_post_send = MSG_get_clock();
-
- if (sent == updated_size) {
- /* timeout did not happen */
- double bandwidth = updated_size / (clock_post_send - clock_prev_send);
- threshold = bandwidth * max_downtime;
- XBT_DEBUG("actual bandwidth %f, threshold %f", bandwidth / 1024 / 1024, threshold);
- remaining_size -= sent;
- stage2_round += 1;
- mig_timeout -= (clock_post_send - clock_prev_send);
- xbt_assert(mig_timeout > 0);
-
- } else if (sent < updated_size) {
- /* When timeout happens, we move to stage 3. The size of memory pages
- * updated before timeout must be added to the remaining size. */
- XBT_VERB("mig-stage2.%d: timeout, force moving to stage 3. sent %llu / %llu, eta %lf", stage2_round, sent,
- updated_size, (clock_post_send - clock_prev_send));
- remaining_size -= sent;
-
- double computed = lookup_computed_flop_counts(ms->vm, 2, stage2_round);
- updated_size = get_updated_size(computed, dp_rate, dp_cap);
- remaining_size += updated_size;
- break;
- } else
- XBT_CRITICAL("bug");
- }
- }
-
- /* Stage3: stop the VM and copy the rest of states. */
- XBT_DEBUG("mig-stage3: remaining_size %f", remaining_size);
- simgrid::vm::VirtualMachineImpl* pimpl = ms->vm->pimpl_vm_;
- pimpl->setState(SURF_VM_STATE_RUNNING); // FIXME: this bypass of the checks in suspend() is not nice
- pimpl->isMigrating = false; // FIXME: this bypass of the checks in suspend() is not nice
- pimpl->suspend(SIMIX_process_self());
- stop_dirty_page_tracking(ms->vm);
-
- try {
- XBT_DEBUG("Stage 3: Gonna send %f bytes", remaining_size);
- send_migration_data(ms->vm, ms->src_pm, ms->dst_pm, static_cast<sg_size_t>(remaining_size), ms->mbox, 3, 0,
- mig_speed, -1);
- }
- catch(xbt_ex& e) {
- //hostfailure (if you want to know whether this is the SRC or the DST check directly in send_migration_data code)
- // Stop the dirty page tracking an return (there is no memory space to release)
- ms->vm->pimpl_vm_->resume();
- return 0;
- }
-
- // At that point the Migration is considered valid for the SRC node but remind that the DST side should relocate
- // effectively the VM on the DST node.
- XBT_DEBUG("mig: tx_done");
-
- return 0;
-}
-
-/** @brief Migrate the VM to the given host.
- * @ingroup msg_VMs
- */
-void MSG_vm_migrate(msg_vm_t vm, msg_host_t dst_pm)
-{
- /* some thoughts:
- * - One approach is ...
- * We first create a new VM (i.e., destination VM) on the destination physical host. The destination VM will
- * receive the state of the source
- * VM over network. We will finally destroy the source VM.
- * - This behavior is similar to the way of migration in the real world.
- * Even before a migration is completed, we will see a destination VM, consuming resources.
- * - We have to relocate all processes. The existing process migration code will work for this?
- * - The name of the VM is a somewhat unique ID in the code. It is tricky for the destination VM?
- *
- * - Another one is ...
- * We update the information of the given VM to place it to the destination physical host.
- *
- * The second one would be easier.
- */
-
- msg_host_t src_pm = vm->pimpl_vm_->getPm();
-
- if (src_pm->isOff())
- THROWF(vm_error, 0, "Cannot migrate VM '%s' from host '%s', which is offline.", vm->getCname(), src_pm->getCname());
- if (dst_pm->isOff())
- THROWF(vm_error, 0, "Cannot migrate VM '%s' to host '%s', which is offline.", vm->getCname(), dst_pm->getCname());
- if (not MSG_vm_is_running(vm))
- THROWF(vm_error, 0, "Cannot migrate VM '%s' that is not running yet.", vm->getCname());
- if (vm->isMigrating())
- THROWF(vm_error, 0, "Cannot migrate VM '%s' that is already migrating.", vm->getCname());
-
- vm->pimpl_vm_->isMigrating = true;
-
- migration_session* ms = xbt_new(migration_session, 1);
- ms->vm = vm;
- ms->src_pm = src_pm;
- ms->dst_pm = dst_pm;
-
- /* We have two mailboxes. mbox is used to transfer migration data between source and destination PMs. mbox_ctl is used
- * to detect the completion of a migration. The names of these mailboxes must not conflict with others. */
- ms->mbox_ctl = bprintf("__mbox_mig_ctl:%s(%s-%s)", vm->getCname(), src_pm->getCname(), dst_pm->getCname());
- ms->mbox = bprintf("__mbox_mig_src_dst:%s(%s-%s)", vm->getCname(), src_pm->getCname(), dst_pm->getCname());
-
- std::string pr_rx_name = get_mig_process_rx_name(vm, src_pm, dst_pm);
- std::string pr_tx_name = get_mig_process_tx_name(vm, src_pm, dst_pm);
-
- MSG_process_create(pr_rx_name.c_str(), migration_rx_fun, ms, dst_pm);
-
- MSG_process_create(pr_tx_name.c_str(), migration_tx_fun, ms, src_pm);
-
- /* wait until the migration have finished or on error has occurred */
- XBT_DEBUG("wait for reception of the final ACK (i.e. migration has been correctly performed");
- msg_task_t task = nullptr;
- msg_error_t ret = MSG_task_receive(&task, ms->mbox_ctl);
-
- vm->pimpl_vm_->isMigrating = false;
-
- xbt_free(ms->mbox_ctl);
- xbt_free(ms->mbox);
- xbt_free(ms);
-
- if (ret == MSG_HOST_FAILURE) {
- // Note that since the communication failed, the owner did not change and the task should be destroyed on the
- // other side. Hence, just throw the execption
- XBT_ERROR("SRC crashes, throw an exception (m-control)");
- // MSG_process_kill(tx_process); // Adrien, I made a merge on Nov 28th 2014, I'm not sure whether this line is
- // required or not
- THROWF(host_error, 0, "Source host '%s' failed during the migration of VM '%s'.", src_pm->getCname(),
- vm->getCname());
- } else if ((ret == MSG_TRANSFER_FAILURE) || (ret == MSG_TIMEOUT)) {
- // MSG_TIMEOUT here means that MSG_host_is_avail() returned false.
- XBT_ERROR("DST crashes, throw an exception (m-control)");
- THROWF(host_error, 0, "Destination host '%s' failed during the migration of VM '%s'.", dst_pm->getCname(),
- vm->getCname());
- }
-
- xbt_assert(get_mig_task_name(vm, src_pm, dst_pm, 4) == task->name);
- MSG_task_destroy(task);
}
/** @brief Immediately suspend the execution of all processes within the given VM.
*/
void MSG_vm_suspend(msg_vm_t vm)
{
- smx_actor_t issuer = SIMIX_process_self();
- simgrid::simix::kernelImmediate([vm, issuer]() { vm->pimpl_vm_->suspend(issuer); });
-
- XBT_DEBUG("vm_suspend done");
-
- if (TRACE_msg_vm_is_enabled()) {
- simgrid::instr::StateType* state = simgrid::instr::Container::byName(vm->getName())->getState("MSG_VM_STATE");
- state->addEntityValue("suspend", "1 0 0"); // suspend is red
- state->pushEvent("suspend");
- }
+ vm->suspend();
}
/** @brief Resume the execution of the VM. All processes on the VM run again.
*/
void MSG_vm_resume(msg_vm_t vm)
{
- vm->pimpl_vm_->resume();
-
- if (TRACE_msg_vm_is_enabled())
- simgrid::instr::Container::byName(vm->getName())->getState("MSG_VM_STATE")->popEvent();
+ vm->resume();
}
-/** @brief Get the physical host of a given VM.
+/** @brief Immediately kills all processes within the given VM.
* @ingroup msg_VMs
+ *
+ * Any memory that they allocated will be leaked, unless you used #MSG_process_on_exit().
+ *
+ * No extra delay occurs. If you want to simulate this too, you want to use a #MSG_process_sleep().
*/
-msg_host_t MSG_vm_get_pm(msg_vm_t vm)
+void MSG_vm_shutdown(msg_vm_t vm)
{
- return vm->getPm();
+ vm->shutdown();
}
-/** @brief Set a CPU bound for a given VM.
+/* Deprecated. Please use MSG_vm_create_migratable() instead */
+msg_vm_t MSG_vm_create(msg_host_t ind_pm, const char* name, int coreAmount, int ramsize, int mig_netspeed,
+ int dp_intensity)
+{
+ return sg_vm_create_migratable(ind_pm, name, coreAmount, ramsize, mig_netspeed, dp_intensity);
+}
+
+/** @brief Destroy a VM. Destroy the VM object from the simulation.
* @ingroup msg_VMs
- *
- * 1. Note that in some cases MSG_task_set_bound() may not intuitively work for VMs.
- *
- * For example,
- * On PM0, there are Task1 and VM0.
- * On VM0, there is Task2.
- * Now we bound 75% to Task1\@PM0 and bound 25% to Task2\@VM0.
- * Then,
- * Task1\@PM0 gets 50%.
- * Task2\@VM0 gets 25%.
- * This is NOT 75% for Task1\@PM0 and 25% for Task2\@VM0, respectively.
- *
- * 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
- * the dummy CPU action. The bound of the dummy CPU action is unlimited.
- *
- * There are some solutions for this problem. One option is to update the bound of the dummy CPU action automatically.
- * It should be the sum of all tasks on the VM. But, this solution might be costly, because we have to scan all tasks
- * on the VM in share_resource() or we have to trap both the start and end of task execution.
- *
- * The current solution is to use MSG_vm_set_bound(), which allows us to directly set the bound of the dummy CPU action.
- *
- * 2. Note that bound == 0 means no bound (i.e., unlimited). But, if a host has multiple CPU cores, the CPU share of a
- * computation task (or a VM) never exceeds the capacity of a CPU core.
*/
-void MSG_vm_set_bound(msg_vm_t vm, double bound)
+void MSG_vm_destroy(msg_vm_t vm)
{
- simgrid::simix::kernelImmediate([vm, bound]() { vm->pimpl_vm_->setBound(bound); });
+ vm->destroy();
}
}
