-/* Copyright (c) 2012. The SimGrid Team. All rights reserved. */
+/* Copyright (c) 2012-2014. The SimGrid Team.
+ * All rights reserved. */
/* 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:
+ * 1. add the support of trace
+ * 2. use parallel tasks to simulate CPU overhead and remove the very
+ * experimental code generating micro computation tasks
+ */
+
-// 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"
+#include "simgrid/platf.h"
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_vm, msg,
"Cloud-oriented parts of the MSG API");
/** \ingroup m_host_management
* \brief Change the value of a given host property
*
- * \param host a host
+ * \param vm a vm
* \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);
+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
* for each VM/PM.
*/
-msg_vm_t MSG_vm_get_by_name(const char *name){
+msg_vm_t MSG_vm_get_by_name(const char *name)
+{
return MSG_get_host_by_name(name);
}
* This functions checks whether \a host is a valid pointer or not and return
its name.
*/
-const char *MSG_vm_get_name(msg_vm_t vm) {
+const char *MSG_vm_get_name(msg_vm_t vm)
+{
return MSG_host_get_name(vm);
}
/* **** Check state of a VM **** */
-static inline int __MSG_vm_is_state(msg_vm_t vm, e_surf_vm_state_t state) {
+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.
+/** @brief Returns whether the given VM has just created, not running.
* @ingroup msg_VMs
*/
int MSG_vm_is_created(msg_vm_t vm)
*/
int MSG_vm_is_migrating(msg_vm_t vm)
{
- return __MSG_vm_is_state(vm, SURF_VM_STATE_MIGRATING);
+ msg_host_priv_t priv = msg_host_resource_priv(vm);
+ return priv->is_migrating;
}
/** @brief Returns whether the given VM is currently suspended, not running.
/** @brief Create a new VM with specified parameters.
* @ingroup msg_VMs*
+ * All parameters are in MBytes
*
*/
msg_vm_t MSG_vm_create(msg_host_t ind_pm, const char *name,
- int core_nb, int mem_cap, int net_cap, char *disk_path, int disk_size)
+ int ncpus, int ramsize,
+ int net_cap, char *disk_path, int disksize,
+ int mig_netspeed, int dp_intensity)
{
- msg_vm_t vm = MSG_vm_create_core(ind_pm, name);
+ /* For the moment, intensity_rate is the percentage against the migration
+ * bandwidth */
+ double host_speed = MSG_get_host_speed(ind_pm);
+ double update_speed = ((double)dp_intensity/100) * mig_netspeed;
- MSG_vm_set_property_value(vm, "CORE_NB", bprintf("%d", core_nb), free);
- MSG_vm_set_property_value(vm, "MEM_CAP", bprintf("%d", mem_cap), free);
- MSG_vm_set_property_value(vm, "NET_CAP", bprintf("%d", net_cap), free);
-
- /* TODO: We will revisit the disk support later. */
+ msg_vm_t vm = MSG_vm_create_core(ind_pm, name);
+ s_ws_params_t params;
+ memset(¶ms, 0, sizeof(params));
+ params.ramsize = (sg_size_t)ramsize * 1024 * 1024;
+ //params.overcommit = 0;
+ params.devsize = 0;
+ params.skip_stage2 = 0;
+ params.max_downtime = 0.03;
+ params.dp_rate = (update_speed * 1024 * 1024) / host_speed;
+ params.dp_cap = params.ramsize * 0.9; // assume working set memory is 90% of ramsize
+ params.mig_speed = (double)mig_netspeed * 1024 * 1024; // mig_speed
+
+ //XBT_INFO("dp rate %f migspeed : %f intensity mem : %d, updatespeed %f, hostspeed %f",params.dp_rate, params.mig_speed, dp_intensity, update_speed, host_speed);
+ simcall_host_set_params(vm, ¶ms);
return vm;
}
{
/* 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_dictelm_t ind_host_tmp = xbt_lib_get_elm_or_null(host_lib, name);
+ if (ind_host_tmp && xbt_lib_get_level(ind_host_tmp, SIMIX_HOST_LEVEL) != NULL) {
XBT_ERROR("host %s already exits", name);
return NULL;
}
msg_vm_t ind_vm = NULL;
void *ind_vm_workstation = NULL;
- // Ask simix to create the surf vm resource
+ /* 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);
return ind_vm;
}
+/** @brief Destroy a VM. Destroy the VM object from the simulation.
+ * @ingroup msg_VMs
+ */
+void MSG_vm_destroy(msg_vm_t vm)
+{
+ if (MSG_vm_is_migrating(vm))
+ THROWF(vm_error, 0, "VM(%s) is migrating", sg_host_name(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_end(vm);
+ #endif
+}
+
-/** @brief Start a vm (ie. boot)
+/** @brief Start a vm (i.e., boot the guest operating system)
* @ingroup msg_VMs
*
* If the VM cannot be started, an exception is generated.
*/
void MSG_vm_start(msg_vm_t vm)
{
- //Please note that vm start can raise an exception if the VM cannot be started.
simcall_vm_start(vm);
#ifdef HAVE_TRACING
}
+
+/* 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. */
+static inline char *get_mig_mbox_src_dst(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm)
+{
+ char *vm_name = sg_host_name(vm);
+ char *src_pm_name = sg_host_name(src_pm);
+ char *dst_pm_name = sg_host_name(dst_pm);
+
+ return bprintf("__mbox_mig_src_dst:%s(%s-%s)", vm_name, src_pm_name, dst_pm_name);
+}
+
+static inline char *get_mig_mbox_ctl(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm)
+{
+ char *vm_name = sg_host_name(vm);
+ char *src_pm_name = sg_host_name(src_pm);
+ char *dst_pm_name = sg_host_name(dst_pm);
+
+ return bprintf("__mbox_mig_ctl:%s(%s-%s)", vm_name, src_pm_name, dst_pm_name);
+}
+
+static inline char *get_mig_process_tx_name(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm)
+{
+ char *vm_name = sg_host_name(vm);
+ char *src_pm_name = sg_host_name(src_pm);
+ char *dst_pm_name = sg_host_name(dst_pm);
+
+ return bprintf("__pr_mig_tx:%s(%s-%s)", vm_name, src_pm_name, dst_pm_name);
+}
+
+static inline char *get_mig_process_rx_name(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm)
+{
+ char *vm_name = sg_host_name(vm);
+ char *src_pm_name = sg_host_name(src_pm);
+ char *dst_pm_name = sg_host_name(dst_pm);
+
+ return bprintf("__pr_mig_rx:%s(%s-%s)", vm_name, src_pm_name, dst_pm_name);
+}
+
+static inline char *get_mig_task_name(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm, int stage)
+{
+ char *vm_name = sg_host_name(vm);
+ char *src_pm_name = sg_host_name(src_pm);
+ char *dst_pm_name = sg_host_name(dst_pm);
+
+ 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);
+
+
+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 = MSG_process_get_data(MSG_process_self());
+
+ s_ws_params_t params;
+ simcall_host_get_params(ms->vm, ¶ms);
+ const double xfer_cpu_overhead = params.xfer_cpu_overhead;
+
+ int need_exit = 0;
+
+ char *finalize_task_name = get_mig_task_name(ms->vm, ms->src_pm, ms->dst_pm, 3);
+
+ int ret = 0;
+ for (;;) {
+ msg_task_t task = NULL;
+ ret = MSG_task_recv(&task, ms->mbox);
+ {
+ double received ;
+ if (ret == MSG_OK)
+ received = MSG_task_get_data_size(task);
+ else{
+ // An error occured, 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;
+ }
+ /* TODO: clean up */
+ // const double alpha = 0.22L * 1.0E8 / (80L * 1024 * 1024);
+ launch_deferred_exec_process(ms->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;
+ }
+
+ // 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 begining and free it at the end of each function)
+ msg_vm_t vm = ms->vm;
+ msg_host_t src_pm = ms->src_pm;
+ msg_host_t dst_pm = ms-> dst_pm;
+ msg_host_priv_t priv = msg_host_resource_priv(vm);
+
+// TODO: we have an issue, if the DST node is turning off during the three next calls, then the VM is in an inconsistent state
+// I should check with Takahiro in order to make this portion of code atomic
+ /* deinstall the current affinity setting for the CPU */
+ simcall_vm_set_affinity(vm, src_pm, 0);
+
+ /* Update the vm location */
+ simcall_vm_migrate(vm, dst_pm);
+
+ /* Resume the VM */
+ simcall_vm_resume(vm);
+
+ /* install the affinity setting of the VM on the destination pm */
+ {
+
+ unsigned long affinity_mask = (unsigned long) xbt_dict_get_or_null_ext(priv->affinity_mask_db, (char *)dst_pm, sizeof(msg_host_t));
+ simcall_vm_set_affinity(vm, dst_pm, affinity_mask);
+ XBT_DEBUG("set affinity(0x%04lx@%s) for %s", affinity_mask, MSG_host_get_name(dst_pm), MSG_host_get_name(vm));
+ }
+
+ {
+
+ // Now the VM is running on the new host (the migration is completed) (even if the SRC crash)
+ msg_host_priv_t priv = msg_host_resource_priv(vm);
+ priv->is_migrating = 0;
+ XBT_DEBUG("VM(%s) moved from PM(%s) to PM(%s)", ms->vm->key, ms->src_pm->key, ms->dst_pm->key);
+ #ifdef HAVE_TRACING
+ TRACE_msg_vm_change_host(ms->vm, ms->src_pm, ms->dst_pm);
+ #endif
+
+ }
+ // 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, NULL);
+ 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_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
+
+static 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: computed %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_DEBUG("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-%p", task->name, task);
+
+ 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-%p", task->name, task);
+
+ 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
+ * computation 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", computation);
+
+ /* 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] = pr_name;
+ argv[1] = bprintf("%f", computation);
+ argv[2] = bprintf("%f", prio);
+ argv[3] = NULL;
+
+ MSG_process_create_with_arguments(pr_name, deferred_exec_fun, NULL, host, nargvs - 1, argv);
+}
+
+
+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] = pr_name;
+ argv[1] = mbox;
+ argv[2] = NULL;
+
+ // XBT_INFO("micro start: mbox %s", mbox);
+ MSG_process_create_with_arguments(pr_name, task_tx_overhead_fun, NULL, MSG_host_self(), nargvs - 1, argv);
+}
+
+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);
+ if(ret != MSG_OK)
+ xbt_die("shutdown error - task not sent");
+
+ 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);
+ if(ret != MSG_OK)
+ xbt_die("req overhead error - task not sent");
+
+ 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);
+ if(ret != MSG_OK)
+ xbt_die("migration error - task not sent");
+
+ 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(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 xfer_cpu_overhead)
+{
+ char *task_name = get_mig_task_name(vm, src_pm, dst_pm, 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);
+ xbt_free(task_name);
+ if(ret == MSG_HOST_FAILURE){
+ //XBT_INFO("SRC host failed during migration of %s (stage %d)", sg_host_name(vm), stage);
+ MSG_task_destroy(task);
+ THROWF(host_error, 0, "SRC host failed during migration of %s (stage %d)", sg_host_name(vm), stage);
+ }else if(ret == MSG_TRANSFER_FAILURE){
+ //XBT_INFO("DST host failed during migration of %s (stage %d)", sg_host_name(vm), stage);
+ MSG_task_destroy(task);
+ THROWF(host_error, 0, "DST host failed during migration of %s (stage %d)", sg_host_name(vm), stage);
+ }
+//else
+// XBT_INFO("Ret != FAILURE !!!!");
+#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_DEBUG("mig-stage%d.%d: sent %llu duration %f actual_speed %f (target %f) cpu %f", stage, stage2_round, size, duration, actual_speed, mig_speed, cpu_utilization);}
+ else{
+ XBT_DEBUG("mig-stage%d: sent %llu duration %f actual_speed %f (target %f) cpu %f", stage, size, duration, actual_speed, mig_speed, cpu_utilization);
+ }
+
+
+#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);
+ if(ret == MSG_HOST_FAILURE){
+ //XBT_INFO("SRC host failed during migration of %s (stage 3)", sg_host_name(vm));
+ MSG_task_destroy(task);
+ THROWF(host_error, 0, "SRC host failed during migration of VM %s (stage 3)", sg_host_name(vm));
+ // The owner of the task did not change so destroy the task
+ return;
+ }else if(ret == MSG_TRANSFER_FAILURE){
+ //XBT_INFO("DST host failed during migration of %s (stage %d)", sg_host_name(vm), stage);
+ MSG_task_destroy(task);
+ THROWF(host_error, 0, "DST host failed during migration of %s (stage %d)", sg_host_name(vm), stage);
+ return;
+ }
+
+ }
+ }
+#endif
+
+}
+
+static double 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 updated_size;
+}
+
+static double send_stage1(struct migration_session *ms,
+ sg_size_t ramsize, double mig_speed, double xfer_cpu_overhead, double dp_rate, double dp_cap, double dpt_cpu_overhead)
+{
+
+ // const long chunksize = (sg_size_t)1024 * 1024 * 100;
+ const sg_size_t chunksize = (sg_size_t)1024 * 1024 * 100000;
+ sg_size_t remaining = ramsize;
+ double computed_total = 0;
+
+ while (remaining > 0) {
+ sg_size_t datasize = chunksize;
+ if (remaining < chunksize)
+ datasize = remaining;
+
+ remaining -= datasize;
+ send_migration_data(ms->vm, ms->src_pm, ms->dst_pm, datasize, ms->mbox, 1, 0, mig_speed, xfer_cpu_overhead);
+ double computed = lookup_computed_flop_counts(ms->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 double get_threshold_value(double bandwidth, double max_downtime)
+{
+ /* This value assumes the network link is 1Gbps. */
+ // double threshold = max_downtime * 125 * 1024 * 1024;
+ double threshold = max_downtime * bandwidth;
+
+ return threshold;
+}
+
+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 ;)
+ struct migration_session *ms = MSG_process_get_data(MSG_process_self());
+
+ s_ws_params_t params;
+ simcall_host_get_params(ms->vm, ¶ms);
+ const sg_size_t ramsize = params.ramsize;
+ const sg_size_t 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;
+
+ msg_vm_t vm=ms->vm;
+
+ 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;
+ }
+
+ double threshold = 0.00001; /* TODO: cleanup */
+
+ /* setting up parameters has done */
+
+
+ if (ramsize == 0)
+ XBT_WARN("migrate a VM, but ramsize is zero");
+
+
+ XBT_DEBUG("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 */
+ double clock_prev_send = MSG_get_clock();
+
+ TRY{
+ computed_during_stage1 = send_stage1(ms, ramsize, mig_speed, xfer_cpu_overhead, dp_rate, dp_cap, dpt_cpu_overhead);
+ } CATCH_ANONYMOUS{
+ //hostfailure (if you want to know whether this is the SRC or the DST please 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(vm);
+ return 0;
+ }
+ remaining_size -= ramsize;
+
+ double clock_post_send = MSG_get_clock();
+ double bandwidth = ramsize / (clock_post_send - clock_prev_send);
+ threshold = get_threshold_value(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 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(ms->vm, 2, stage2_round);
+ updated_size = get_updated_size(computed, dp_rate, dp_cap);
+ }
+
+ XBT_DEBUG("mig-stage 2:%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_DEBUG("updated %f overhead %f", updated_size, overhead);
+ // launch_deferred_exec_process(vm, overhead, 10000);
+ // }
+
+
+ {
+ 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;
+ }
+
+ double clock_prev_send = MSG_get_clock();
+ TRY{
+ send_migration_data(ms->vm, ms->src_pm, ms->dst_pm, updated_size, ms->mbox, 2, stage2_round, mig_speed, xfer_cpu_overhead);
+ }CATCH_ANONYMOUS{
+ //hostfailure (if you want to know whether this is the SRC or the DST please 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(vm);
+ return 0;
+ }
+ double clock_post_send = MSG_get_clock();
+
+ double bandwidth = updated_size / (clock_post_send - clock_prev_send);
+ threshold = get_threshold_value(bandwidth, max_downtime);
+ XBT_DEBUG("actual bandwidth %f, threshold %f", bandwidth / 1024 / 1024, threshold);
+
+
+ remaining_size -= updated_size;
+ stage2_round += 1;
+ }
+
+
+stage3:
+ /* Stage3: stop the VM and copy the rest of states. */
+ XBT_DEBUG("mig-stage3: remaining_size %f", remaining_size);
+ simcall_vm_suspend(vm);
+ stop_dirty_page_tracking(vm);
+
+ TRY{
+ send_migration_data(ms->vm, ms->src_pm, ms->dst_pm, remaining_size, ms->mbox, 3, 0, mig_speed, xfer_cpu_overhead);
+ }CATCH_ANONYMOUS{
+ //hostfailure (if you want to know whether this is the SRC or the DST please check directly in send_migration_data code)
+ // Stop the dirty page tracking an return (there is no memory space to release)
+ simcall_vm_resume(vm);
+ 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;
+}
+
+
+
+static int do_migration(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm)
+{
+ struct migration_session *ms = xbt_new(struct migration_session, 1);
+ ms->vm = vm;
+ ms->src_pm = src_pm;
+ ms->dst_pm = dst_pm;
+ ms->mbox_ctl = get_mig_mbox_ctl(vm, src_pm, dst_pm);
+ ms->mbox = get_mig_mbox_src_dst(vm, src_pm, dst_pm);
+
+
+ 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);
+#if 1
+ {
+ char **argv = xbt_new(char *, 2);
+ argv[0] = pr_rx_name;
+ argv[1] = NULL;
+ MSG_process_create_with_arguments(pr_rx_name, migration_rx_fun, ms, dst_pm, 1, argv);
+ }
+ {
+ char **argv = xbt_new(char *, 2);
+ argv[0] = pr_tx_name;
+ argv[1] = NULL;
+ MSG_process_create_with_arguments(pr_tx_name, migration_tx_fun, ms, src_pm, 1, argv);
+ }
+#endif
+
+ /* wait until the migration have finished or on error has occured */
+ {
+ XBT_DEBUG("wait for reception of the final ACK (i.e. migration has been correctly performed");
+ msg_task_t task = NULL;
+ msg_error_t ret = MSG_TIMEOUT;
+ while (ret == MSG_TIMEOUT && MSG_host_is_on(dst_pm)) //Wait while you receive the message o
+ ret = MSG_task_receive_with_timeout(&task, ms->mbox_ctl, 10);
+
+ xbt_free(ms->mbox_ctl);
+ xbt_free(ms->mbox);
+ xbt_free(ms);
+
+ //xbt_assert(ret == MSG_OK);
+ 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_INFO("SRC crashes, throw an exception (m-control)");
+ return -1;
+ }
+ else if((ret == MSG_TRANSFER_FAILURE) || (ret == MSG_TIMEOUT)){ // MSG_TIMEOUT here means that MSG_host_is_avail() returned false.
+ //XBT_INFO("DST crashes, throw an exception (m-control)");
+ return -2;
+ }
+
+
+ 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);
+ return 0;
+ }
+}
+
+
+
+
/** @brief Migrate the VM to the given host.
* @ingroup msg_VMs
*
* 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)
+void MSG_vm_migrate(msg_vm_t vm, msg_host_t new_pm)
{
/* some thoughts:
* - One approach is ...
*
*/
- #ifdef HAVE_TRACING
- const char *old_pm_name = simcall_vm_get_phys_host(vm);
- msg_host_t old_pm_ind = xbt_lib_get_elm_or_null(host_lib, old_pm_name);
- #endif
+ msg_host_t old_pm = simcall_vm_get_pm(vm);
- simcall_vm_migrate(vm, destination);
+ if (!MSG_vm_is_running(vm))
+ THROWF(vm_error, 0, "VM(%s) is not running", sg_host_name(vm));
+ if (MSG_vm_is_migrating(vm))
+ THROWF(vm_error, 0, "VM(%s) is already migrating", sg_host_name(vm));
- #ifdef HAVE_TRACING
- TRACE_msg_vm_change_host(vm, old_pm_ind, destination);
- #endif
+ msg_host_priv_t priv = msg_host_resource_priv(vm);
+ priv->is_migrating = 1;
+
+ {
+
+ int ret = do_migration(vm, old_pm, new_pm);
+ if (ret == -1){
+ priv->is_migrating = 0;
+ THROWF(host_error, 0, "SRC host failed during migration");
+ }
+ else if(ret == -2){
+ priv->is_migrating = 0;
+ THROWF(host_error, 0, "DST host failed during migration");
+ }
+ }
+
+ // This part is done in the RX code, to handle the corner case where SRC can crash just at the end of the migration process
+ // In that case, the VM has been already assigned to the DST node.
+ //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_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.
+ * This function stops the execution of the VM. All the processes on this VM
+ * will pause. The state of the VM is preserved. We can later resume it again.
*
* No suspension cost occurs.
*/
void MSG_vm_suspend(msg_vm_t vm)
{
+ if (MSG_vm_is_migrating(vm))
+ THROWF(vm_error, 0, "VM(%s) is migrating", sg_host_name(vm));
+
simcall_vm_suspend(vm);
+ XBT_DEBUG("vm_suspend done");
+
#ifdef HAVE_TRACING
TRACE_msg_vm_suspend(vm);
#endif
/** @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.
+ * This function stops the execution of the VM. All the processes on this VM
+ * will pause. The state of the VM is preserved. 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
*/
void MSG_vm_save(msg_vm_t vm)
{
- simcall_vm_save(vm);
+ if (MSG_vm_is_migrating(vm))
+ THROWF(vm_error, 0, "VM(%s) is migrating", sg_host_name(vm));
+ simcall_vm_save(vm);
#ifdef HAVE_TRACING
TRACE_msg_vm_save(vm);
#endif
}
-
/** @brief Restore the execution of the VM. All processes on the VM run again.
* @ingroup msg_VMs
*
}
-/** @brief Destroy a VM. Destroy the VM object from the simulation.
+/** @brief Get the physical host of a given VM.
* @ingroup msg_VMs
*/
-void MSG_vm_destroy(msg_vm_t vm)
+msg_host_t MSG_vm_get_pm(msg_vm_t vm)
{
- /* First, terminate all processes on the VM */
- simcall_vm_shutdown(vm);
+ return simcall_vm_get_pm(vm);
+}
- /* Then, destroy the VM object */
- simcall_vm_destroy(vm);
- #ifdef HAVE_TRACING
- TRACE_msg_vm_end(vm);
- #endif
+/** @brief Set a CPU bound for a given VM.
+ * @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)
+{
+ return simcall_vm_set_bound(vm, bound);
+}
+
+
+/** @brief Set the CPU affinity of a given VM.
+ * @ingroup msg_VMs
+ *
+ * This function changes the CPU affinity of a given VM. Usage is the same as
+ * MSG_task_set_affinity(). See the MSG_task_set_affinity() for details.
+ */
+void MSG_vm_set_affinity(msg_vm_t vm, msg_host_t pm, unsigned long mask)
+{
+ msg_host_priv_t priv = msg_host_resource_priv(vm);
+
+ if (mask == 0)
+ xbt_dict_remove_ext(priv->affinity_mask_db, (char *) pm, sizeof(pm));
+ else
+ xbt_dict_set_ext(priv->affinity_mask_db, (char *) pm, sizeof(pm), (void *) mask, NULL);
+
+ msg_host_t pm_now = MSG_vm_get_pm(vm);
+ if (pm_now == pm) {
+ XBT_DEBUG("set affinity(0x%04lx@%s) for %s", mask, MSG_host_get_name(pm), MSG_host_get_name(vm));
+ simcall_vm_set_affinity(vm, pm, mask);
+ } else
+ XBT_DEBUG("set affinity(0x%04lx@%s) for %s (not active now)", mask, MSG_host_get_name(pm), MSG_host_get_name(vm));
}