X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/a3ebaa86f4ddc2bc225d676e9ce5028aad78f71a..dd22867177c86db2e9d0b76852cb09e044b1c0c8:/src/msg/msg_vm.c diff --git a/src/msg/msg_vm.c b/src/msg/msg_vm.c index 11435255eb..113b52167f 100644 --- a/src/msg/msg_vm.c +++ b/src/msg/msg_vm.c @@ -3,6 +3,20 @@ /* This program is free software; you can redistribute it and/or modify it * under the terms of the license (GNU LGPL) which comes with this package. */ +// QUESTIONS: +// 1./ check how and where a new VM is added to the list of the hosts +// 2./ Diff between SIMIX_Actions and SURF_Actions +// => SIMIX_actions : point synchro entre processus de niveau (theoretically speaking I do not have to create such SIMIX_ACTION +// => Surf_Actions + +// TODO +// MSG_TRACE can be revisited in order to use the host +// To implement a mixed model between workstation and vm_workstation, +// please give a look at surf_model_private_t model_private at SURF Level and to the share resource functions +// double (*share_resources) (double now); +// For the action into the vm workstation model, we should be able to leverage the usual one (and if needed, look at +// the workstation model. + #include "msg_private.h" #include "xbt/sysdep.h" #include "xbt/log.h" @@ -10,217 +24,1160 @@ XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_vm, msg, "Cloud-oriented parts of the MSG API"); -/** @brief Create a new (empty) VMs. - * @ingroup msg_VMs + +/* **** ******** GENERAL ********* **** */ + +/** \ingroup m_vm_management + * \brief Returns the value of a given vm property * - * @bug it is expected that in the future, the coreAmount parameter will be used - * to add extra constraints on the execution, but the argument is ignored for now. + * \param vm a vm + * \param name a property name + * \return value of a property (or NULL if property not set) */ -msg_vm_t MSG_vm_start(msg_host_t location, const char *name, int coreAmount) { - msg_vm_t res = xbt_new0(s_msg_vm_t,1); - res->all_vms_hookup.prev = NULL; - res->host_vms_hookup.prev = NULL; - res->state = msg_vm_state_running; - res->location = location; - res->coreAmount = coreAmount; - res->name = xbt_strdup(name); - res->processes = xbt_dynar_new(sizeof(msg_process_t),NULL); +const char *MSG_vm_get_property_value(msg_vm_t vm, const char *name) +{ + return MSG_host_get_property_value(vm, name); +} + +/** \ingroup m_vm_management + * \brief Returns a xbt_dict_t consisting of the list of properties assigned to this host + * + * \param vm a vm + * \return a dict containing the properties + */ +xbt_dict_t MSG_vm_get_properties(msg_vm_t vm) +{ + xbt_assert((vm != NULL), "Invalid parameters (vm is NULL)"); - xbt_swag_insert(res,msg_global->vms); - xbt_swag_insert(res, MSG_host_priv(location)->vms); + return (simcall_host_get_properties(vm)); +} - #ifdef HAVE_TRACING - TRACE_msg_vm_create(name, location); - #endif +/** \ingroup m_host_management + * \brief Change the value of a given host property + * + * \param host a host + * \param name a property name + * \param value what to change the property to + * \param free_ctn the freeing function to use to kill the value on need + */ +void MSG_vm_set_property_value(msg_vm_t vm, const char *name, void *value, void_f_pvoid_t free_ctn) +{ + xbt_dict_set(MSG_host_get_properties(vm), name, value, free_ctn); +} +/** \ingroup msg_vm_management + * \brief Finds a msg_vm_t using its name. + * + * This is a name directory service + * \param name the name of a vm. + * \return the corresponding vm + * + * Please note that a VM is a specific host. Hence, you should give a different name + * for each VM/PM. + */ - return res; +msg_vm_t MSG_vm_get_by_name(const char *name) +{ + return MSG_get_host_by_name(name); } -/** @brief Returns a newly constructed dynar containing all existing VMs in the system. - * @ingroup msg_VMs + +/** \ingroup m_vm_management + * + * \brief Return the name of the #msg_host_t. * - * Don't forget to free the dynar after use. + * This functions checks whether \a host is a valid pointer or not and return + its name. */ -xbt_dynar_t MSG_vms_as_dynar(void) { - xbt_dynar_t res = xbt_dynar_new(sizeof(msg_vm_t),NULL); - msg_vm_t vm; - xbt_swag_foreach(vm,msg_global->vms) { - xbt_dynar_push(res,&vm); - } - return res; +const char *MSG_vm_get_name(msg_vm_t vm) +{ + return MSG_host_get_name(vm); } -/** @brief Returns whether the given VM is currently suspended + +/* **** Check state of a VM **** */ +static inline int __MSG_vm_is_state(msg_vm_t vm, e_surf_vm_state_t state) +{ + return simcall_vm_get_state(vm) == state; +} + +/** @brief Returns whether the given VM has just reated, not running. * @ingroup msg_VMs */ -int MSG_vm_is_suspended(msg_vm_t vm) { - return vm->state == msg_vm_state_suspended; +int MSG_vm_is_created(msg_vm_t vm) +{ + return __MSG_vm_is_state(vm, SURF_VM_STATE_CREATED); } + /** @brief Returns whether the given VM is currently running * @ingroup msg_VMs */ -int MSG_vm_is_running(msg_vm_t vm) { - return vm->state == msg_vm_state_running; +int MSG_vm_is_running(msg_vm_t vm) +{ + return __MSG_vm_is_state(vm, SURF_VM_STATE_RUNNING); } -/** @brief Add the given process into the VM. + +/** @brief Returns whether the given VM is currently migrating * @ingroup msg_VMs - * - * Afterward, when the VM is migrated or suspended or whatever, the process will have the corresponding handling, too. - * */ -void MSG_vm_bind(msg_vm_t vm, msg_process_t process) { - /* check if the process is already in a VM */ - simdata_process_t simdata = simcall_process_get_data(process); - if (simdata->vm) { - msg_vm_t old_vm = simdata->vm; - int pos = xbt_dynar_search(old_vm->processes,&process); - xbt_dynar_remove_at(old_vm->processes,pos, NULL); - } - /* check if the host is in the right host */ - if (simdata->m_host != vm->location) { - MSG_process_migrate(process,vm->location); - } - simdata->vm = vm; +int MSG_vm_is_migrating(msg_vm_t vm) +{ + return __MSG_vm_is_state(vm, SURF_VM_STATE_MIGRATING); +} - XBT_DEBUG("binding Process %s to %p",MSG_process_get_name(process),vm); +/** @brief Returns whether the given VM is currently suspended, not running. + * @ingroup msg_VMs + */ +int MSG_vm_is_suspended(msg_vm_t vm) +{ + return __MSG_vm_is_state(vm, SURF_VM_STATE_SUSPENDED); +} - xbt_dynar_push_as(vm->processes,msg_process_t,process); +/** @brief Returns whether the given VM is being saved (FIXME: live saving or not?). + * @ingroup msg_VMs + */ +int MSG_vm_is_saving(msg_vm_t vm) +{ + return __MSG_vm_is_state(vm, SURF_VM_STATE_SAVING); } -/** @brief Removes the given process from the given VM, and kill it + +/** @brief Returns whether the given VM has been saved, not running. * @ingroup msg_VMs - * - * Will raise a not_found exception if the process were not bound to that VM */ -void MSG_vm_unbind(msg_vm_t vm, msg_process_t process) { - int pos = xbt_dynar_search(vm->processes,process); - xbt_dynar_remove_at(vm->processes,pos, NULL); - MSG_process_kill(process); +int MSG_vm_is_saved(msg_vm_t vm) +{ + return __MSG_vm_is_state(vm, SURF_VM_STATE_SAVED); } -/** @brief Immediately change the host on which all processes are running. +/** @brief Returns whether the given VM is being restored, not running. * @ingroup msg_VMs + */ +int MSG_vm_is_restoring(msg_vm_t vm) +{ + return __MSG_vm_is_state(vm, SURF_VM_STATE_RESTORING); +} + + + +/* ------------------------------------------------------------------------- */ +/* ------------------------------------------------------------------------- */ + +/* **** ******** MSG vm actions ********* **** */ + +/** @brief Create a new VM with specified parameters. + * @ingroup msg_VMs* * - * No migration cost occurs. If you want to simulate this too, you want to use a - * MSG_task_send() before or after, depending on whether you want to do cold or hot - * migration. */ -void MSG_vm_migrate(msg_vm_t vm, msg_host_t destination) { - unsigned int cpt; - msg_process_t process; - xbt_dynar_foreach(vm->processes,cpt,process) { - MSG_process_migrate(process,destination); +msg_vm_t MSG_vm_create(msg_host_t ind_pm, const char *name, + int ncpus, long ramsize, long net_cap, char *disk_path, long disksize) +{ + msg_vm_t vm = MSG_vm_create_core(ind_pm, name); + + { + s_ws_params_t params; + memset(¶ms, 0, sizeof(params)); + params.ramsize = ramsize; + //params.overcommit = 0; + simcall_host_set_params(vm, ¶ms); } - xbt_swag_remove(vm, MSG_host_priv(vm->location)->vms); - xbt_swag_insert_at_tail(vm, MSG_host_priv(destination)->vms); - + + /* TODO: Limit net capability, take into account disk considerations. */ + + return vm; +} + + +/** @brief Create a new VM object. The VM is not yet started. The resource of the VM is allocated upon MSG_vm_start(). + * @ingroup msg_VMs* + * + * A VM is treated as a host. The name of the VM must be unique among all hosts. + */ +msg_vm_t MSG_vm_create_core(msg_host_t ind_pm, const char *name) +{ + /* make sure the VM of the same name does not exit */ + { + void *ind_host_tmp = xbt_lib_get_elm_or_null(host_lib, name); + if (ind_host_tmp) { + XBT_ERROR("host %s already exits", name); + return NULL; + } + } + + /* Note: ind_vm and vm_workstation point to the same elm object. */ + msg_vm_t ind_vm = NULL; + void *ind_vm_workstation = NULL; + + /* Ask the SIMIX layer to create the surf vm resource */ + ind_vm_workstation = simcall_vm_create(name, ind_pm); + ind_vm = (msg_vm_t) __MSG_host_create(ind_vm_workstation); + + XBT_DEBUG("A new VM (%s) has been created", name); + #ifdef HAVE_TRACING - TRACE_msg_vm_change_host(vm,vm->location,destination); + TRACE_msg_vm_create(name, ind_pm); #endif - vm->location = destination; + return ind_vm; } -/** @brief Immediately suspend the execution of all processes within the given VM. +/** @brief Destroy a VM. Destroy the VM object from the simulation. * @ingroup msg_VMs - * - * No suspension cost occurs. If you want to simulate this too, you want to - * use a \ref MSG_file_write() before or after, depending on the exact semantic - * of VM suspend to you. */ -void MSG_vm_suspend(msg_vm_t vm) { - unsigned int cpt; - msg_process_t process; - xbt_dynar_foreach(vm->processes,cpt,process) { - XBT_DEBUG("suspend process %s of host %s",MSG_process_get_name(process),MSG_host_get_name(MSG_process_get_host(process))); - MSG_process_suspend(process); +void MSG_vm_destroy(msg_vm_t vm) +{ + /* First, terminate all processes on the VM if necessary */ + if (MSG_vm_is_running(vm)) + simcall_vm_shutdown(vm); + + if (!MSG_vm_is_created(vm)) { + XBT_CRITICAL("shutdown the given VM before destroying it"); + DIE_IMPOSSIBLE; } + /* Then, destroy the VM object */ + simcall_vm_destroy(vm); + + __MSG_host_destroy(vm); + #ifdef HAVE_TRACING - TRACE_msg_vm_suspend(vm); + TRACE_msg_vm_end(vm); #endif } -/** @brief Immediately resumes the execution of all processes within the given VM. + +/** @brief Start a vm (i.e., boot the guest operating system) * @ingroup msg_VMs * - * No resume cost occurs. If you want to simulate this too, you want to - * use a \ref MSG_file_read() before or after, depending on the exact semantic - * of VM resume to you. + * If the VM cannot be started, an exception is generated. + * */ -void MSG_vm_resume(msg_vm_t vm) { - unsigned int cpt; - msg_process_t process; - xbt_dynar_foreach(vm->processes,cpt,process) { - XBT_DEBUG("resume process %s of host %s",MSG_process_get_name(process),MSG_host_get_name(MSG_process_get_host(process))); - MSG_process_resume(process); - } +void MSG_vm_start(msg_vm_t vm) +{ + simcall_vm_start(vm); #ifdef HAVE_TRACING - TRACE_msg_vm_resume(vm); + TRACE_msg_vm_start(vm); #endif } + + /** @brief Immediately kills all processes within the given VM. Any memory that they allocated will be leaked. * @ingroup msg_VMs * - * No extra delay occurs. If you want to simulate this too, you want to + * FIXME: No extra delay occurs. If you want to simulate this too, you want to * use a #MSG_process_sleep() or something. I'm not quite sure. */ void MSG_vm_shutdown(msg_vm_t vm) { - msg_process_t process; - XBT_DEBUG("%lu processes in the VM", xbt_dynar_length(vm->processes)); - while (!xbt_dynar_is_empty(vm->processes)) { - process = xbt_dynar_get_as(vm->processes,0,msg_process_t); - MSG_process_kill(process); + /* msg_vm_t equals to msg_host_t */ + simcall_vm_shutdown(vm); + + // #ifdef HAVE_TRACING + // TRACE_msg_vm_(vm); + // #endif +} + + + +/* We have two mailboxes. mbox is used to transfer migration data between + * source and destiantion PMs. mbox_ctl is used to detect the completion of a + * migration. The names of these mailboxes must not conflict with others. */ +static inline char *get_mig_mbox_src_dst(const char *vm_name, const char *src_pm_name, const char *dst_pm_name) +{ + return bprintf("__mbox_mig_src_dst:%s(%s-%s)", vm_name, src_pm_name, dst_pm_name); +} + +static inline char *get_mig_mbox_ctl(const char *vm_name, const char *src_pm_name, const char *dst_pm_name) +{ + return bprintf("__mbox_mig_ctl:%s(%s-%s)", vm_name, src_pm_name, dst_pm_name); +} + +static inline char *get_mig_process_tx_name(const char *vm_name, const char *src_pm_name, const char *dst_pm_name) +{ + return bprintf("__pr_mig_tx:%s(%s-%s)", vm_name, src_pm_name, dst_pm_name); +} + +static inline char *get_mig_process_rx_name(const char *vm_name, const char *src_pm_name, const char *dst_pm_name) +{ + return bprintf("__pr_mig_rx:%s(%s-%s)", vm_name, src_pm_name, dst_pm_name); +} + +static inline char *get_mig_task_name(const char *vm_name, const char *src_pm_name, const char *dst_pm_name, int stage) +{ + return bprintf("__task_mig_stage%d:%s(%s-%s)", stage, vm_name, src_pm_name, dst_pm_name); +} + +static void launch_deferred_exec_process(msg_host_t host, double computation, double prio); + +static int migration_rx_fun(int argc, char *argv[]) +{ + XBT_DEBUG("mig: rx_start"); + + xbt_assert(argc == 4); + const char *vm_name = argv[1]; + const char *src_pm_name = argv[2]; + const char *dst_pm_name = argv[3]; + msg_vm_t vm = MSG_get_host_by_name(vm_name); + msg_vm_t dst_pm = MSG_get_host_by_name(dst_pm_name); + + + s_ws_params_t params; + simcall_host_get_params(vm, ¶ms); + const double xfer_cpu_overhead = params.xfer_cpu_overhead; + + + int need_exit = 0; + + char *mbox = get_mig_mbox_src_dst(vm_name, src_pm_name, dst_pm_name); + char *mbox_ctl = get_mig_mbox_ctl(vm_name, src_pm_name, dst_pm_name); + char *finalize_task_name = get_mig_task_name(vm_name, src_pm_name, dst_pm_name, 3); + + for (;;) { + msg_task_t task = NULL; + MSG_task_recv(&task, mbox); + { + double received = MSG_task_get_data_size(task); + /* TODO: clean up */ + // const double alpha = 0.22L * 1.0E8 / (80L * 1024 * 1024); + launch_deferred_exec_process(vm, received * xfer_cpu_overhead, 1); + } + + if (strcmp(task->name, finalize_task_name) == 0) + need_exit = 1; + + MSG_task_destroy(task); + + if (need_exit) + break; + } + + + simcall_vm_migrate(vm, dst_pm); + simcall_vm_resume(vm); + + { + char *task_name = get_mig_task_name(vm_name, src_pm_name, dst_pm_name, 4); + + msg_task_t task = MSG_task_create(task_name, 0, 0, NULL); + msg_error_t ret = MSG_task_send(task, mbox_ctl); + xbt_assert(ret == MSG_OK); + + xbt_free(task_name); + } + + + xbt_free(mbox); + xbt_free(mbox_ctl); + xbt_free(finalize_task_name); + + XBT_DEBUG("mig: rx_done"); + + return 0; +} + +static void reset_dirty_pages(msg_vm_t vm) +{ + msg_host_priv_t priv = msg_host_resource_priv(vm); + + char *key = NULL; + xbt_dict_cursor_t cursor = NULL; + dirty_page_t dp = NULL; + xbt_dict_foreach(priv->dp_objs, cursor, key, dp) { + double remaining = MSG_task_get_remaining_computation(dp->task); + dp->prev_clock = MSG_get_clock(); + dp->prev_remaining = remaining; + + // XBT_INFO("%s@%s remaining %f", key, sg_host_name(vm), remaining); + } +} + +static void start_dirty_page_tracking(msg_vm_t vm) +{ + msg_host_priv_t priv = msg_host_resource_priv(vm); + priv->dp_enabled = 1; + + reset_dirty_pages(vm); +} + +static void stop_dirty_page_tracking(msg_vm_t vm) +{ + msg_host_priv_t priv = msg_host_resource_priv(vm); + priv->dp_enabled = 0; +} + +#if 0 +/* It might be natural that we define dp_rate for each task. But, we will also + * have to care about how each task behavior affects the memory update behavior + * at the operating system level. It may not be easy to model it with a simple algorithm. */ +double calc_updated_pages(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; + double updated = dp->task->dp_rate * computed; + + XBT_INFO("%s@%s: computated %f ops (remaining %f -> %f) in %f secs (%f -> %f)", + key, sg_host_name(vm), computed, dp->prev_remaining, remaining, duration, dp->prev_clock, clock); + XBT_INFO("%s@%s: updated %f bytes, %f Mbytes/s", + key, sg_host_name(vm), updated, updated / duration / 1000 / 1000); + + return updated; +} +#endif + +double get_computed(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: computated %f ops (remaining %f -> %f) in %f secs (%f -> %f)", + key, sg_host_name(vm), 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) +{ + msg_host_priv_t priv = msg_host_resource_priv(vm); + double total = 0; + + char *key = NULL; + xbt_dict_cursor_t cursor = NULL; + dirty_page_t dp = NULL; + xbt_dict_foreach(priv->dp_objs, cursor, key, dp) { + double remaining = MSG_task_get_remaining_computation(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 += priv->dp_updated_by_deleted_tasks; + + XBT_INFO("mig-stage%d.%d: computed %f flop_counts (including %f by deleted tasks)", + stage_for_fancy_debug, + stage2_round_for_fancy_debug, + total, priv->dp_updated_by_deleted_tasks); + + + + priv->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) +void MSG_host_add_task(msg_host_t host, msg_task_t task) +{ + msg_host_priv_t priv = msg_host_resource_priv(host); + double remaining = MSG_task_get_remaining_computation(task); + char *key = bprintf("%s-%lld", task->name, task->counter); + + dirty_page_t dp = xbt_new0(s_dirty_page, 1); + dp->task = task; + + /* It should be okay that we add a task onto a migrating VM. */ + if (priv->dp_enabled) { + dp->prev_clock = MSG_get_clock(); + dp->prev_remaining = remaining; + } + + xbt_assert(xbt_dict_get_or_null(priv->dp_objs, key) == NULL); + xbt_dict_set(priv->dp_objs, key, dp, NULL); + XBT_DEBUG("add %s on %s (remaining %f, dp_enabled %d)", key, sg_host_name(host), remaining, priv->dp_enabled); + + xbt_free(key); +} + +void MSG_host_del_task(msg_host_t host, msg_task_t task) +{ + msg_host_priv_t priv = msg_host_resource_priv(host); + + char *key = bprintf("%s-%lld", task->name, task->counter); + + dirty_page_t dp = xbt_dict_get_or_null(priv->dp_objs, key); + xbt_assert(dp->task == task); + + /* If we are in the middle of dirty page tracking, we record how much + * computaion has been done until now, and keep the information for the + * lookup_() function that will called soon. */ + if (priv->dp_enabled) { + double remaining = MSG_task_get_remaining_computation(task); + double clock = MSG_get_clock(); + // double updated = calc_updated_pages(key, host, dp, remaining, clock); + double updated = get_computed(key, host, dp, remaining, clock); + + priv->dp_updated_by_deleted_tasks += updated; + } + + xbt_dict_remove(priv->dp_objs, key); + xbt_free(dp); + + XBT_DEBUG("del %s on %s", key, sg_host_name(host)); + + xbt_free(key); +} + + +static int deferred_exec_fun(int argc, char *argv[]) +{ + xbt_assert(argc == 3); + const char *comp_str = argv[1]; + double computaion = atof(comp_str); + const char *prio_str = argv[2]; + double prio = atof(prio_str); + + msg_task_t task = MSG_task_create("__task_deferred", computaion, 0, NULL); + // XBT_INFO("exec deferred %f", computaion); + + /* dpt is the results of the VM activity */ + MSG_task_set_priority(task, prio); + MSG_task_execute(task); + + + + MSG_task_destroy(task); + + return 0; +} + +static void launch_deferred_exec_process(msg_host_t host, double computation, double prio) +{ + char *pr_name = bprintf("__pr_deferred_exec_%s", MSG_host_get_name(host)); + + int nargvs = 4; + char **argv = xbt_new(char *, nargvs); + argv[0] = xbt_strdup(pr_name); + argv[1] = bprintf("%lf", computation); + argv[2] = bprintf("%lf", prio); + argv[3] = NULL; + + msg_process_t pr = MSG_process_create_with_arguments(pr_name, deferred_exec_fun, NULL, host, nargvs - 1, argv); + + xbt_free(pr_name); +} + + +static int task_tx_overhead_fun(int argc, char *argv[]) +{ + xbt_assert(argc == 2); + const char *mbox = argv[1]; + + int need_exit = 0; + + // XBT_INFO("start %s", mbox); + + for (;;) { + msg_task_t task = NULL; + MSG_task_recv(&task, mbox); + + // XBT_INFO("task->name %s", task->name); + + if (strcmp(task->name, "finalize_making_overhead") == 0) + need_exit = 1; + + // XBT_INFO("exec"); + // MSG_task_set_priority(task, 1000000); + MSG_task_execute(task); + MSG_task_destroy(task); + + if (need_exit) + break; + } + + // XBT_INFO("bye"); + + return 0; +} + +static void start_overhead_process(msg_task_t comm_task) +{ + char *pr_name = bprintf("__pr_task_tx_overhead_%s", MSG_task_get_name(comm_task)); + char *mbox = bprintf("__mb_task_tx_overhead_%s", MSG_task_get_name(comm_task)); + + int nargvs = 3; + char **argv = xbt_new(char *, nargvs); + argv[0] = xbt_strdup(pr_name); + argv[1] = xbt_strdup(mbox); + argv[2] = NULL; + + // XBT_INFO("micro start: mbox %s", mbox); + msg_process_t pr = MSG_process_create_with_arguments(pr_name, task_tx_overhead_fun, NULL, MSG_host_self(), nargvs - 1, argv); + + xbt_free(pr_name); + xbt_free(mbox); +} + +static void shutdown_overhead_process(msg_task_t comm_task) +{ + char *mbox = bprintf("__mb_task_tx_overhead_%s", MSG_task_get_name(comm_task)); + + msg_task_t task = MSG_task_create("finalize_making_overhead", 0, 0, NULL); + + // XBT_INFO("micro shutdown: mbox %s", mbox); + msg_error_t ret = MSG_task_send(task, mbox); + xbt_assert(ret == MSG_OK); + + xbt_free(mbox); + // XBT_INFO("shutdown done"); +} + +static void request_overhead(msg_task_t comm_task, double computation) +{ + char *mbox = bprintf("__mb_task_tx_overhead_%s", MSG_task_get_name(comm_task)); + + msg_task_t task = MSG_task_create("micro", computation, 0, NULL); + + // XBT_INFO("req overhead"); + msg_error_t ret = MSG_task_send(task, mbox); + xbt_assert(ret == MSG_OK); + + xbt_free(mbox); +} + +/* alpha is (floating_operations / bytes). + * + * When actual migration traffic was 32 mbytes/s, we observed the CPU + * utilization of the main thread of the Qemu process was 10 %. + * alpha = 0.1 * C / (32 * 1024 * 1024) + * where the CPU capacity of the PM is C flops/s. + * + * */ +static void task_send_bounded_with_cpu_overhead(msg_task_t comm_task, char *mbox, double mig_speed, double alpha) +{ + const double chunk_size = 1024 * 1024 * 10; + double remaining = MSG_task_get_data_size(comm_task); + + start_overhead_process(comm_task); + + + while (remaining > 0) { + double data_size = chunk_size; + if (remaining < chunk_size) + data_size = remaining; + + remaining -= data_size; + + // XBT_INFO("remaining %f bytes", remaining); + + + double clock_sta = MSG_get_clock(); + + /* create a micro task */ + { + char *mtask_name = bprintf("__micro_%s", MSG_task_get_name(comm_task)); + msg_task_t mtask = MSG_task_create(mtask_name, 0, data_size, NULL); + + request_overhead(comm_task, data_size * alpha); + + msg_error_t ret = MSG_task_send(mtask, mbox); + xbt_assert(ret == MSG_OK); + + xbt_free(mtask_name); + } + +#if 0 + { + /* In the real world, sending data involves small CPU computation. */ + char *mtask_name = bprintf("__micro_%s", MSG_task_get_name(comm_task)); + msg_task_t mtask = MSG_task_create(mtask_name, data_size * alpha, data_size, NULL); + MSG_task_execute(mtask); + MSG_task_destroy(mtask); + xbt_free(mtask_name); + } +#endif + + /* TODO */ + + double clock_end = MSG_get_clock(); + + + if (mig_speed > 0) { + /* + * (max bandwidth) > data_size / ((elapsed time) + time_to_sleep) + * + * Thus, we get + * time_to_sleep > data_size / (max bandwidth) - (elapsed time) + * + * If time_to_sleep is smaller than zero, the elapsed time was too big. We + * do not need a micro sleep. + **/ + double time_to_sleep = data_size / mig_speed - (clock_end - clock_sta); + if (time_to_sleep > 0) + MSG_process_sleep(time_to_sleep); + + + //XBT_INFO("duration %f", clock_end - clock_sta); + //XBT_INFO("time_to_sleep %f", time_to_sleep); + } } + // XBT_INFO("%s", MSG_task_get_name(comm_task)); + shutdown_overhead_process(comm_task); + +} + + +#if 0 +static void make_cpu_overhead_of_data_transfer(msg_task_t comm_task, double init_comm_size) +{ + double prev_remaining = init_comm_size; + + for (;;) { + double remaining = MSG_task_get_remaining_communication(comm_task); + if (remaining == 0) + need_exit = 1; + + double sent = prev_remaining - remaining; + double comp_size = sent * overhead; + + + char *comp_task_name = bprintf("__sender_overhead%s", MSG_task_get_name(comm_task)); + msg_task_t comp_task = MSG_task_create(comp_task_name, comp_size, 0, NULL); + MSG_task_execute(comp_task); + MSG_task_destroy(comp_task); + + if (need_exit) + break; + + prev_remaining = remaining; + + } + + xbt_free(comp_task_name); +} +#endif + +#define USE_MICRO_TASK 1 + +#if 0 +// const double alpha = 0.1L * 1.0E8 / (32L * 1024 * 1024); +// const double alpha = 0.25L * 1.0E8 / (85L * 1024 * 1024); +// const double alpha = 0.20L * 1.0E8 / (85L * 1024 * 1024); +// const double alpha = 0.25L * 1.0E8 / (85L * 1024 * 1024); +// const double alpha = 0.32L * 1.0E8 / (24L * 1024 * 1024); // makes super good values for 32 mbytes/s +//const double alpha = 0.32L * 1.0E8 / (32L * 1024 * 1024); +// const double alpha = 0.56L * 1.0E8 / (80L * 1024 * 1024); +////const double alpha = 0.20L * 1.0E8 / (80L * 1024 * 1024); +// const double alpha = 0.56L * 1.0E8 / (90L * 1024 * 1024); +// const double alpha = 0.66L * 1.0E8 / (90L * 1024 * 1024); +// const double alpha = 0.20L * 1.0E8 / (80L * 1024 * 1024); + +/* CPU 22% when 80Mbyte/s */ +const double alpha = 0.22L * 1.0E8 / (80L * 1024 * 1024); +#endif + + +static void send_migration_data(const char *vm_name, const char *src_pm_name, const char *dst_pm_name, + double size, char *mbox, int stage, int stage2_round, double mig_speed, double xfer_cpu_overhead) +{ + char *task_name = get_mig_task_name(vm_name, src_pm_name, dst_pm_name, stage); + msg_task_t task = MSG_task_create(task_name, 0, size, NULL); + + /* TODO: clean up */ + + double clock_sta = MSG_get_clock(); + +#ifdef USE_MICRO_TASK + + task_send_bounded_with_cpu_overhead(task, mbox, mig_speed, xfer_cpu_overhead); + +#else + msg_error_t ret; + if (mig_speed > 0) + ret = MSG_task_send_bounded(task, mbox, mig_speed); + else + ret = MSG_task_send(task, mbox); + xbt_assert(ret == MSG_OK); +#endif + + double clock_end = MSG_get_clock(); + double duration = clock_end - clock_sta; + double actual_speed = size / duration; +#ifdef USE_MICRO_TASK + double cpu_utilization = size * xfer_cpu_overhead / duration / 1.0E8; +#else + double cpu_utilization = 0; +#endif + + + + + if (stage == 2) + XBT_INFO("mig-stage%d.%d: sent %f duration %f actual_speed %f (target %f) cpu %f", stage, stage2_round, size, duration, actual_speed, mig_speed, cpu_utilization); + else + XBT_INFO("mig-stage%d: sent %f duration %f actual_speed %f (target %f) cpu %f", stage, size, duration, actual_speed, mig_speed, cpu_utilization); + + xbt_free(task_name); + + + +#ifdef USE_MICRO_TASK + /* The name of a micro task starts with __micro, which does not match the + * special name that finalizes the receiver loop. Thus, we send the special task. + **/ + { + if (stage == 3) { + char *task_name = get_mig_task_name(vm_name, src_pm_name, dst_pm_name, stage); + msg_task_t task = MSG_task_create(task_name, 0, 0, NULL); + msg_error_t ret = MSG_task_send(task, mbox); + xbt_assert(ret == MSG_OK); + xbt_free(task_name); + } + } +#endif +} + +double get_updated_size(double computed, double dp_rate, double dp_cap) +{ + double updated_size = computed * dp_rate; + XBT_INFO("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 updated_size; +} + +static double send_stage1(msg_host_t vm, const char *src_pm_name, const char *dst_pm_name, + long ramsize, double mig_speed, double xfer_cpu_overhead, double dp_rate, double dp_cap, double dpt_cpu_overhead) +{ + const char *vm_name = MSG_host_get_name(vm); + char *mbox = get_mig_mbox_src_dst(vm_name, src_pm_name, dst_pm_name); + + const long chunksize = 1024 * 1024 * 100; + long remaining = ramsize; + double computed_total = 0; + + while (remaining > 0) { + long datasize = chunksize; + if (remaining < chunksize) + datasize = remaining; + + remaining -= datasize; + + send_migration_data(vm_name, src_pm_name, dst_pm_name, datasize, mbox, 1, 0, mig_speed, xfer_cpu_overhead); + + double computed = lookup_computed_flop_counts(vm, 1, 0); + computed_total += computed; + + { + double updated_size = get_updated_size(computed, dp_rate, dp_cap); + + double overhead = dpt_cpu_overhead * updated_size; + launch_deferred_exec_process(vm, overhead, 10000); + } + } + + return computed_total; +} + + + + +static int migration_tx_fun(int argc, char *argv[]) +{ + XBT_DEBUG("mig: tx_start"); + + xbt_assert(argc == 4); + const char *vm_name = argv[1]; + const char *src_pm_name = argv[2]; + const char *dst_pm_name = argv[3]; + msg_vm_t vm = MSG_get_host_by_name(vm_name); + + + s_ws_params_t params; + simcall_host_get_params(vm, ¶ms); + const long ramsize = params.ramsize; + const long devsize = params.devsize; + const int skip_stage1 = params.skip_stage1; + const int skip_stage2 = params.skip_stage2; + const double dp_rate = params.dp_rate; + const double dp_cap = params.dp_cap; + const double mig_speed = params.mig_speed; + const double xfer_cpu_overhead = params.xfer_cpu_overhead; + const double dpt_cpu_overhead = params.dpt_cpu_overhead; + + double remaining_size = ramsize + devsize; + + double max_downtime = params.max_downtime; + if (max_downtime == 0) { + XBT_WARN("use the default max_downtime value 30ms"); + max_downtime = 0.03; + } + + /* This value assumes the network link is 1Gbps. */ + double threshold = max_downtime * 125 * 1024 * 1024; + + /* setting up parameters has done */ + + + if (ramsize == 0) + XBT_WARN("migrate a VM, but ramsize is zero"); + + char *mbox = get_mig_mbox_src_dst(vm_name, src_pm_name, dst_pm_name); + + XBT_INFO("mig-stage1: remaining_size %f", remaining_size); + + /* Stage1: send all memory pages to the destination. */ + start_dirty_page_tracking(vm); + + double computed_during_stage1 = 0; + if (!skip_stage1) { + // send_migration_data(vm_name, src_pm_name, dst_pm_name, ramsize, mbox, 1, 0, mig_speed, xfer_cpu_overhead); + + /* send ramsize, but split it */ + computed_during_stage1 = send_stage1(vm, src_pm_name, dst_pm_name, ramsize, mig_speed, xfer_cpu_overhead, dp_rate, dp_cap, dpt_cpu_overhead); + remaining_size -= ramsize; + } + + + /* Stage2: send update pages iteratively until the size of remaining states + * becomes smaller than the threshold value. */ + if (skip_stage2) + goto stage3; + if (max_downtime == 0) { + XBT_WARN("no max_downtime parameter, skip stage2"); + goto stage3; + } + + + int stage2_round = 0; + for (;;) { + + double 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(vm, 2, stage2_round); + updated_size = get_updated_size(computed, dp_rate, dp_cap); + } + + XBT_INFO("%d updated_size %f computed_during_stage1 %f dp_rate %f dp_cap %f", + stage2_round, updated_size, computed_during_stage1, dp_rate, dp_cap); + + + if (stage2_round != 0) { + /* during stage1, we have already created overhead tasks */ + double overhead = dpt_cpu_overhead * updated_size; + XBT_INFO("updated %f overhead %f", updated_size, overhead); + launch_deferred_exec_process(vm, overhead, 10000); + } + + + { + remaining_size += updated_size; + + XBT_INFO("mig-stage2.%d: remaining_size %f (%s threshold %f)", stage2_round, + remaining_size, (remaining_size < threshold) ? "<" : ">", threshold); + + if (remaining_size < threshold) + break; + } + + + send_migration_data(vm_name, src_pm_name, dst_pm_name, updated_size, mbox, 2, stage2_round, mig_speed, xfer_cpu_overhead); + + remaining_size -= updated_size; + stage2_round += 1; + } + + +stage3: + /* Stage3: stop the VM and copy the rest of states. */ + XBT_INFO("mig-stage3: remaining_size %f", remaining_size); + simcall_vm_suspend(vm); + stop_dirty_page_tracking(vm); + + send_migration_data(vm_name, src_pm_name, dst_pm_name, remaining_size, mbox, 3, 0, mig_speed, xfer_cpu_overhead); + + xbt_free(mbox); + + XBT_DEBUG("mig: tx_done"); + + return 0; +} + + + +static void do_migration(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm) +{ + char *mbox_ctl = get_mig_mbox_ctl(sg_host_name(vm), sg_host_name(src_pm), sg_host_name(dst_pm)); + + { + char *pr_name = get_mig_process_rx_name(sg_host_name(vm), sg_host_name(src_pm), sg_host_name(dst_pm)); + int nargvs = 5; + char **argv = xbt_new(char *, nargvs); + argv[0] = xbt_strdup(pr_name); + argv[1] = xbt_strdup(sg_host_name(vm)); + argv[2] = xbt_strdup(sg_host_name(src_pm)); + argv[3] = xbt_strdup(sg_host_name(dst_pm)); + argv[4] = NULL; + + MSG_process_create_with_arguments(pr_name, migration_rx_fun, NULL, dst_pm, nargvs - 1, argv); + + xbt_free(pr_name); + } + + { + char *pr_name = get_mig_process_tx_name(sg_host_name(vm), sg_host_name(src_pm), sg_host_name(dst_pm)); + int nargvs = 5; + char **argv = xbt_new(char *, nargvs); + argv[0] = xbt_strdup(pr_name); + argv[1] = xbt_strdup(sg_host_name(vm)); + argv[2] = xbt_strdup(sg_host_name(src_pm)); + argv[3] = xbt_strdup(sg_host_name(dst_pm)); + argv[4] = NULL; + MSG_process_create_with_arguments(pr_name, migration_tx_fun, NULL, src_pm, nargvs - 1, argv); + + xbt_free(pr_name); + } + + /* wait until the migration have finished */ + { + msg_task_t task = NULL; + msg_error_t ret = MSG_task_recv(&task, mbox_ctl); + xbt_assert(ret == MSG_OK); + + char *expected_task_name = get_mig_task_name(sg_host_name(vm), sg_host_name(src_pm), sg_host_name(dst_pm), 4); + xbt_assert(strcmp(task->name, expected_task_name) == 0); + xbt_free(expected_task_name); + } + + xbt_free(mbox_ctl); +} + + +/** @brief Migrate the VM to the given host. + * @ingroup msg_VMs + * + * FIXME: No migration cost occurs. If you want to simulate this too, you want to use a + * MSG_task_send() before or after, depending on whether you want to do cold or hot + * migration. + */ +void MSG_vm_migrate(msg_vm_t vm, msg_host_t new_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 migraion 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 old_pm = simcall_vm_get_pm(vm); + + if (simcall_vm_get_state(vm) != SURF_VM_STATE_RUNNING) + THROWF(vm_error, 0, "VM(%s) is not running", sg_host_name(vm)); + + do_migration(vm, old_pm, new_pm); + + + + XBT_DEBUG("VM(%s) moved from PM(%s) to PM(%s)", vm->key, old_pm->key, new_pm->key); + #ifdef HAVE_TRACING - TRACE_msg_vm_kill(vm); + TRACE_msg_vm_change_host(vm, old_pm, new_pm); #endif +} + +/** @brief Immediately suspend the execution of all processes within the given VM. + * @ingroup msg_VMs + * + * This function stops the exection of the VM. All the processes on this VM + * will pause. The state of the VM is perserved. We can later resume it again. + * + * No suspension cost occurs. + */ +void MSG_vm_suspend(msg_vm_t vm) +{ + simcall_vm_suspend(vm); + + XBT_DEBUG("vm_suspend done"); + + #ifdef HAVE_TRACING + TRACE_msg_vm_suspend(vm); + #endif } -/** - * \ingroup msg_VMs - * \brief Reboot the VM, restarting all the processes in it. + +/** @brief Resume the execution of the VM. All processes on the VM run again. + * @ingroup msg_VMs + * + * No resume cost occurs. */ -void MSG_vm_reboot(msg_vm_t vm) +void MSG_vm_resume(msg_vm_t vm) { - xbt_dynar_t process_list = xbt_dynar_new(sizeof(msg_process_t), NULL); - msg_process_t process; - unsigned int cpt; + simcall_vm_resume(vm); - xbt_dynar_foreach(vm->processes, cpt, process) { - xbt_dynar_push_as(process_list, msg_process_t, process); - } + #ifdef HAVE_TRACING + TRACE_msg_vm_resume(vm); + #endif +} - xbt_dynar_foreach(process_list, cpt, process) { - msg_process_t new_process = MSG_process_restart(process); - MSG_vm_bind(vm, new_process); - } - xbt_dynar_free(&process_list); +/** @brief Immediately save the execution of all processes within the given VM. + * @ingroup msg_VMs + * + * This function stops the exection of the VM. All the processes on this VM + * will pause. The state of the VM is perserved. We can later resume it again. + * + * FIXME: No suspension cost occurs. If you want to simulate this too, you want to + * use a \ref MSG_file_write() before or after, depending on the exact semantic + * of VM save to you. + */ +void MSG_vm_save(msg_vm_t vm) +{ + simcall_vm_save(vm); + #ifdef HAVE_TRACING + TRACE_msg_vm_save(vm); + #endif } -/** @brief Destroy a msg_vm_t. +/** @brief Restore the execution of the VM. All processes on the VM run again. * @ingroup msg_VMs + * + * FIXME: No restore cost occurs. If you want to simulate this too, you want to + * use a \ref MSG_file_read() before or after, depending on the exact semantic + * of VM restore to you. */ -void MSG_vm_destroy(msg_vm_t vm) { - unsigned int cpt; - msg_process_t process; - xbt_dynar_foreach(vm->processes,cpt,process) { - //FIXME: Slow ? - simdata_process_t simdata = simcall_process_get_data(process); - simdata->vm = NULL; - } +void MSG_vm_restore(msg_vm_t vm) +{ + simcall_vm_restore(vm); #ifdef HAVE_TRACING - TRACE_msg_vm_end(vm); + TRACE_msg_vm_restore(vm); #endif +} - xbt_free(vm->name); - xbt_dynar_free(&vm->processes); - xbt_free(vm); + + + +/** @brief Get the physical host of a given VM. + * @ingroup msg_VMs + */ +msg_host_t MSG_vm_get_pm(msg_vm_t vm) +{ + return simcall_vm_get_pm(vm); }