X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/d6f28805ee451fb3acd89794b90756a1cf234c37..3eebc3b5c61e849fe77b69ccce662a485aeb248d:/src/msg/msg_vm.cpp diff --git a/src/msg/msg_vm.cpp b/src/msg/msg_vm.cpp index 7cf836a767..67d1e40867 100644 --- a/src/msg/msg_vm.cpp +++ b/src/msg/msg_vm.cpp @@ -1,4 +1,4 @@ -/* Copyright (c) 2012-2015. The SimGrid Team. +/* Copyright (c) 2012-2017. The SimGrid Team. * All rights reserved. */ /* This program is free software; you can redistribute it and/or modify it @@ -11,58 +11,44 @@ #include -#include "src/instr/instr_private.h" -#include "src/msg/msg_private.h" +#include "simgrid/plugins/live_migration.h" +#include "src/instr/instr_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" -SG_BEGIN_DECL() - -struct dirty_page { - double prev_clock; - double prev_remaining; - msg_task_t task; -}; -typedef struct dirty_page s_dirty_page; -typedef struct dirty_page* dirty_page_t; +extern "C" { 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->getParameters(params); + vm->setRamsize(size); } -/* **** Check state of a VM **** */ -static inline int __MSG_vm_is_state(msg_vm_t vm, e_surf_vm_state_t state) +size_t MSG_vm_get_ramsize(msg_vm_t vm) { - return vm->pimpl_vm_ != nullptr && vm->pimpl_vm_->getState() == state; + return vm->getRamsize(); +} + +void MSG_vm_set_bound(msg_vm_t vm, double bound) +{ + vm->setBound(bound); } /** @brief Returns whether the given VM has just created, not running. @@ -70,7 +56,7 @@ static inline int __MSG_vm_is_state(msg_vm_t vm, e_surf_vm_state_t state) */ 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 @@ -78,15 +64,7 @@ int MSG_vm_is_created(msg_vm_t vm) */ 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. @@ -94,42 +72,10 @@ int MSG_vm_is_migrating(msg_vm_t vm) */ 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; - memset(¶ms, 0, sizeof(params)); - params.ramsize = static_cast(ramsize) * 1024 * 1024; - params.devsize = 0; - params.skip_stage2 = 0; - params.max_downtime = 0.03; - params.mig_speed = static_cast(mig_netspeed) * 1024 * 1024; // mig_speed - params.dp_intensity = static_cast(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* * @@ -137,10 +83,7 @@ msg_vm_t MSG_vm_create(msg_host_t pm, const char* name, int coreAmount, int rams */ 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* @@ -155,28 +98,6 @@ msg_vm_t MSG_vm_create_multicore(msg_host_t pm, const char* name, int coreAmount 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 = PJ_container_get(vm->getCname()); - PJ_container_remove_from_parent(container); - PJ_container_free(container); - } -} - /** @brief Start a vm (i.e., boot the guest operating system) * @ingroup msg_VMs * @@ -184,611 +105,7 @@ void MSG_vm_destroy(msg_vm_t vm) */ void MSG_vm_start(msg_vm_t vm) { - simgrid::simix::kernelImmediate([vm]() { - simgrid::vm::VmHostExt::ensureVmExtInstalled(); - - simgrid::s4u::Host* pm = vm->pimpl_vm_->getPm(); - if (pm->extension() == nullptr) - pm->extension_set(new simgrid::vm::VmHostExt()); - - long pm_ramsize = pm->extension()->ramsize; - int pm_overcommit = pm->extension()->overcommit; - long vm_ramsize = vm->getRamsize(); - - if (pm_ramsize && not pm_overcommit) { /* Only verify that we don't overcommit on need */ - /* Retrieve the memory occupied by the VMs on that host. Yep, we have to traverse all VMs of all hosts for that */ - long total_ramsize_of_vms = 0; - for (simgrid::s4u::VirtualMachine* ws_vm : simgrid::vm::VirtualMachineImpl::allVms_) - if (pm == ws_vm->pimpl_vm_->getPm()) - total_ramsize_of_vms += ws_vm->pimpl_vm_->getRamsize(); - - if (vm_ramsize > pm_ramsize - total_ramsize_of_vms) { - XBT_WARN("cannnot start %s@%s due to memory shortage: vm_ramsize %ld, free %ld, pm_ramsize %ld (bytes).", - vm->getCname(), pm->getCname(), vm_ramsize, pm_ramsize - total_ramsize_of_vms, pm_ramsize); - THROWF(vm_error, 0, "Memory shortage on host '%s', VM '%s' cannot be started", pm->getCname(), vm->getCname()); - } - } - - vm->pimpl_vm_->setState(SURF_VM_STATE_RUNNING); - }); - - if (TRACE_msg_vm_is_enabled()) { - container_t vm_container = PJ_container_get(vm->getCname()); - type_t type = PJ_type_get("MSG_VM_STATE", vm_container->type); - value* val = value::get_or_new("start", "0 0 1", type); // start is blue - new PushStateEvent(MSG_get_clock(), vm_container, type, val); - } -} - -/** @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 the processes in the VM are killed in this scheduling round before processing - // (eg with the VM destroy) - MSG_process_sleep(0.); -} - -static inline char *get_mig_process_tx_name(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm) -{ - return bprintf("__pr_mig_tx:%s(%s-%s)", vm->getCname(), src_pm->getCname(), dst_pm->getCname()); -} - -static inline char *get_mig_process_rx_name(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm) -{ - return bprintf("__pr_mig_rx:%s(%s-%s)", vm->getCname(), src_pm->getCname(), dst_pm->getCname()); -} - -static inline char *get_mig_task_name(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm, int stage) -{ - return bprintf("__task_mig_stage%d:%s(%s-%s)", 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 ;) - struct migration_session* ms = static_cast(MSG_process_get_data(MSG_process_self())); - - bool received_finalize = false; - - char *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 - xbt_free(finalize_task_name); - return 0; - } - - if (strcmp(task->name, finalize_task_name) == 0) - received_finalize = 1; - - MSG_task_destroy(task); - } - xbt_free(finalize_task_name); - - // 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; - char key[INSTR_DEFAULT_STR_SIZE]; - snprintf(key, INSTR_DEFAULT_STR_SIZE, "%lld", counter); - counter++; - - // start link - container_t msg = PJ_container_get(vm->getCname()); - type_t type = PJ_type_get("MSG_VM_LINK", PJ_type_get_root()); - new StartLinkEvent(MSG_get_clock(), PJ_container_get_root(), type, msg, "M", key); - - // destroy existing container of this vm - container_t existing_container = PJ_container_get(vm->getCname()); - PJ_container_remove_from_parent(existing_container); - PJ_container_free(existing_container); - - // create new container on the new_host location - PJ_container_new(vm->getCname(), INSTR_MSG_VM, PJ_container_get(ms->dst_pm->getCname())); - - // end link - msg = PJ_container_get(vm->getCname()); - type = PJ_type_get("MSG_VM_LINK", PJ_type_get_root()); - new EndLinkEvent(MSG_get_clock(), PJ_container_get_root(), type, msg, "M", key); - } - - // Inform the SRC that the migration has been correctly performed - char *task_name = get_mig_task_name(ms->vm, ms->src_pm, ms->dst_pm, 4); - msg_task_t task = MSG_task_create(task_name, 0, 0, nullptr); - msg_error_t ret = MSG_task_send(task, ms->mbox_ctl); - // xbt_assert(ret == MSG_OK); - 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_free(task_name); - - 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 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 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 += calc_updated_pages(key, vm, dp, remaining, 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(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(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 = calc_updated_pages(key, host, dp, remaining, 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; - char *task_name = get_mig_task_name(vm, src_pm, dst_pm, stage); - msg_task_t task = MSG_task_create(task_name, 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, timeout, mig_speed); - else - ret = MSG_task_send(task, mbox); - - xbt_free(task_name); - - 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) { - // XBT_INFO("mig-stage2.%d: %f bytes updated, but cap it with the working set size %f", stage2_round, 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->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(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(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; - - struct migration_session *ms = xbt_new(struct 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()); - - char *pr_rx_name = get_mig_process_rx_name(vm, src_pm, dst_pm); - char *pr_tx_name = get_mig_process_tx_name(vm, src_pm, dst_pm); - - MSG_process_create(pr_rx_name, migration_rx_fun, ms, dst_pm); - - MSG_process_create(pr_tx_name, 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()); - } - - char* expected_task_name = get_mig_task_name(vm, src_pm, dst_pm, 4); - xbt_assert(strcmp(task->name, expected_task_name) == 0); - xbt_free(expected_task_name); - MSG_task_destroy(task); + vm->start(); } /** @brief Immediately suspend the execution of all processes within the given VM. @@ -801,17 +118,7 @@ void MSG_vm_migrate(msg_vm_t vm, msg_host_t dst_pm) */ 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()) { - container_t vm_container = PJ_container_get(vm->getCname()); - type_t type = PJ_type_get("MSG_VM_STATE", vm_container->type); - value* val = value::get_or_new("suspend", "1 0 0", type); // suspend is red - new PushStateEvent(MSG_get_clock(), vm_container, type, val); - } + vm->suspend(); } /** @brief Resume the execution of the VM. All processes on the VM run again. @@ -821,52 +128,33 @@ void MSG_vm_suspend(msg_vm_t vm) */ void MSG_vm_resume(msg_vm_t vm) { - vm->pimpl_vm_->resume(); - - if (TRACE_msg_vm_is_enabled()) { - container_t vm_container = PJ_container_get(vm->getCname()); - type_t type = PJ_type_get("MSG_VM_STATE", vm_container->type); - new PopStateEvent(MSG_get_clock(), vm_container, type); - } + 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(); +} } - -SG_END_DECL()