X-Git-Url: http://bilbo.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/de74c92736a83f89b47de30f7603e25d4f6687a5..20fb1d8f699a02bdfd23130097cf7cf3d11f5840:/src/msg/msg_vm.cpp diff --git a/src/msg/msg_vm.cpp b/src/msg/msg_vm.cpp index e876a2603c..c43ab8db24 100644 --- a/src/msg/msg_vm.cpp +++ b/src/msg/msg_vm.cpp @@ -29,6 +29,14 @@ const char* MSG_vm_get_name(msg_vm_t vm) return vm->getCname(); } +/** @brief Get the physical host of a given VM. + * @ingroup msg_VMs + */ +msg_host_t MSG_vm_get_pm(msg_vm_t vm) +{ + return vm->getPm(); +} + /** \ingroup m_vm_management * \brief Set the parameters of a given host * @@ -61,6 +69,10 @@ size_t MSG_vm_get_ramsize(msg_vm_t vm) } /* **** Check state of a VM **** */ +void MSG_vm_set_bound(msg_vm_t vm, double bound) +{ + vm->setBound(bound); +} static inline int __MSG_vm_is_state(msg_vm_t vm, e_surf_vm_state_t state) { return vm->pimpl_vm_ != nullptr && vm->getState() == state; @@ -160,27 +172,6 @@ msg_vm_t MSG_vm_create_multicore(msg_host_t pm, const char* name, int coreAmount return vm; } -/** @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 */ - vm->shutdown(); - - /* Then, destroy the VM object */ - 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 * @@ -196,439 +187,6 @@ void MSG_vm_start(msg_vm_t 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(). - */ -void MSG_vm_shutdown(msg_vm_t vm) -{ - vm->shutdown(); -} - -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. */ - std::string mbox_ctl; - /* The migration_rx and migration_tx processes use mbox to transfer migration data. */ - std::string 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(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.c_str()); - - 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->getState() == SURF_VM_STATE_SUSPENDED); - - /* Update the vm location and resume it */ - vm->pimpl_vm_->setPm(dst_pm); - 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.c_str()); - 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 sg_size_t send_migration_data(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm, sg_size_t size, - const std::string& 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(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.c_str(), timeout, mig_speed); - else - ret = MSG_task_send(task, mbox.c_str()); - - if (ret == MSG_OK) { - sent = size; - } else if (ret == MSG_TIMEOUT) { - sg_size_t remaining = static_cast(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(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(MSG_process_get_data(MSG_process_self())); - - double host_speed = ms->vm->getPm()->getSpeed(); - s_vm_params_t params; - ms->vm->getParameters(¶ms); - const sg_size_t ramsize = ms->vm->getRamsize(); - 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; - bool skip_stage2 = false; - - size_t remaining_size = ramsize; - size_t 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 %zu", remaining_size); - sg_vm_start_dirty_page_tracking(ms->vm); - - double computed_during_stage1 = 0; - 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 = sg_vm_lookup_computed_flops(ms->vm); - - if (sent < ramsize) { - XBT_VERB("mig-stage1: timeout, force moving to stage 3"); - skip_stage2 = true; - } 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) - sg_vm_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 = true; - } - - /* estimate bandwidth */ - double bandwidth = ramsize / (clock_post_send - clock_prev_send); - threshold = bandwidth * max_downtime; - XBT_DEBUG("actual bandwidth %f (MB/s), threshold %zu", 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 = sg_vm_lookup_computed_flops(ms->vm); - 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 %zu (%s threshold %zu)", 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) - sg_vm_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 %zu", 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 = sg_vm_lookup_computed_flops(ms->vm); - 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 %zu", 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()); - sg_vm_stop_dirty_page_tracking(ms->vm); - - try { - XBT_DEBUG("Stage 3: Gonna send %zu bytes", remaining_size); - send_migration_data(ms->vm, ms->src_pm, ms->dst_pm, 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->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->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; - 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 = - simgrid::xbt::string_printf("__mbox_mig_ctl:%s(%s-%s)", vm->getCname(), src_pm->getCname(), dst_pm->getCname()); - ms.mbox = simgrid::xbt::string_printf("__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.c_str()); - - vm->pimpl_vm_->isMigrating = false; - - 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. * @ingroup msg_VMs * @@ -659,16 +217,37 @@ void MSG_vm_resume(msg_vm_t vm) simgrid::instr::Container::byName(vm->getName())->getState("MSG_VM_STATE")->popEvent(); } -/** @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(); } -void MSG_vm_set_bound(msg_vm_t vm, double bound) +/** @brief Destroy a VM. Destroy the VM object from the simulation. + * @ingroup msg_VMs + */ +void MSG_vm_destroy(msg_vm_t vm) { - vm->setBound(bound); + 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 */ + vm->shutdown(); + + /* Then, destroy the VM object */ + vm->destroy(); + + if (TRACE_msg_vm_is_enabled()) { + container_t container = simgrid::instr::Container::byName(vm->getName()); + container->removeFromParent(); + delete container; + } } + }