/* 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
+ * 2. use parallel tasks to simulate CPU overhead and remove the experimental code generating micro computation tasks
*/
-
-
#include "msg_private.h"
#include "xbt/sysdep.h"
#include "xbt/log.h"
-#include "simgrid/platf.h"
#include "simgrid/host.h"
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_vm, msg,
- "Cloud-oriented parts of the MSG API");
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_vm, msg, "Cloud-oriented parts of the MSG API");
/* **** ******** GENERAL ********* **** */
-
/** \ingroup m_vm_management
* \brief Returns the value of a given vm property
*
* \param name a property name
* \return value of a property (or NULL if property not set)
*/
-
const char *MSG_vm_get_property_value(msg_vm_t vm, const char *name)
{
return MSG_host_get_property_value(vm, name);
xbt_dict_t MSG_vm_get_properties(msg_vm_t vm)
{
xbt_assert((vm != NULL), "Invalid parameters (vm is NULL)");
- return vm->getProperties();
+ return vm->properties();
}
/** \ingroup m_host_management
* \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.
+ * Please note that a VM is a specific host. Hence, you should give a different name for each VM/PM.
*/
-
msg_vm_t MSG_vm_get_by_name(const char *name)
{
return MSG_host_by_name(name);
*
* \brief Return the name of the #msg_host_t.
*
- * This functions checks whether \a host is a valid pointer or not and return
- its 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)
{
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)
{
return __MSG_vm_is_state(vm, SURF_VM_STATE_RESTORING);
}
-
-
-/* ------------------------------------------------------------------------- */
-/* ------------------------------------------------------------------------- */
-
/* **** ******** 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 [TODO]
+ * @param ncpus [TODO]
+ * @param ramsize [TODO]
* @param net_cap Maximal bandwidth that the VM can consume (in MByte/s)
* @param disk_path (unused) Path to the image that boots
* @param disksize (unused) will represent the size of the VM (will be used during migrations)
* @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 ncpus, int ramsize,
- int net_cap, char *disk_path, int disksize,
- int mig_netspeed, int dp_intensity)
+msg_vm_t MSG_vm_create(msg_host_t pm, const char *name, int ncpus, int ramsize, int net_cap, char *disk_path,
+ int disksize, int mig_netspeed, int dp_intensity)
{
/* For the moment, intensity_rate is the percentage against the migration
* bandwidth */
- double host_speed = MSG_get_host_speed(pm);
+ double host_speed = MSG_host_get_speed(pm);
double update_speed = ((double)dp_intensity/100) * mig_netspeed;
msg_vm_t vm = MSG_vm_create_core(pm, name);
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);
- vm->setParams(¶ms);
+ //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);
+ vm->setParameters(¶ms);
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*
*
{
/* make sure the VM of the same name does not exit */
{
- simgrid::Host* ind_host_tmp =
- (simgrid::Host*) xbt_dict_get_or_null(host_list, name);
+ simgrid::s4u::Host* ind_host_tmp = (simgrid::s4u::Host*) xbt_dict_get_or_null(host_list, name);
if (ind_host_tmp != nullptr && sg_host_simix(ind_host_tmp) != nullptr) {
XBT_ERROR("host %s already exits", name);
return nullptr;
}
/* Note: ind_vm and vm_workstation point to the same elm object. */
-
/* Ask the SIMIX layer to create the surf vm resource */
sg_host_t ind_vm_workstation = (sg_host_t) simcall_vm_create(name, ind_pm);
/* Then, destroy the VM object */
simcall_vm_destroy(vm);
- __MSG_host_destroy(vm);
-
TRACE_msg_vm_end(vm);
}
-
/** @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)
{
TRACE_msg_vm_start(vm);
}
-
-
/** @brief Immediately kills all processes within the given VM. Any memory that they allocated will be leaked.
* @ingroup msg_VMs
*
- * 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.
+ * 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)
{
// TRACE_msg_vm_(vm);
}
-
-
-/* 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. */
+/* 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)
{
const char *vm_name = sg_host_get_name(vm);
return bprintf("__task_mig_stage%d:%s(%s-%s)", stage, vm_name, src_pm_name, dst_pm_name);
}
-
struct migration_session {
msg_vm_t vm;
msg_host_t src_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. */
+ /* 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");
struct migration_session *ms = (migration_session *) MSG_process_get_data(MSG_process_self());
s_vm_params_t params;
- ms->vm->getParams(¶ms);
+ ms->vm->parameters(¶ms);
int need_exit = 0;
ret = MSG_task_recv(&task, ms->mbox);
{
if (ret != MSG_OK) {
- // An error occured, clean the code and return
+ // 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;
// 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)
+ // 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)
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 = sg_host_msg(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
+// 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);
//
/* install the affinity setting of the VM on the destination pm */
{
- unsigned long affinity_mask = (unsigned long)(uintptr_t) xbt_dict_get_or_null_ext(priv->affinity_mask_db, (char *)dst_pm, sizeof(msg_host_t));
+ unsigned long affinity_mask =
+ (unsigned long)(uintptr_t) 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 = sg_host_msg(vm);
priv->is_migrating = 0;
- XBT_DEBUG("VM(%s) moved from PM(%s) to PM(%s)",
- sg_host_get_name(ms->vm), sg_host_get_name(ms->src_pm),
- sg_host_get_name(ms->dst_pm));
+ XBT_DEBUG("VM(%s) moved from PM(%s) to PM(%s)", sg_host_get_name(ms->vm), sg_host_get_name(ms->src_pm),
+ sg_host_get_name(ms->dst_pm));
TRACE_msg_vm_change_host(ms->vm, ms->src_pm, ms->dst_pm);
}
// Inform the SRC that the migration has been correctly performed
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
+ // 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;
}
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);
-
-
+ 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;
}
dirty_page_t dp = (dirty_page_t) 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 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_flops_amount(task);
double clock = MSG_get_clock();
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)
+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);
} else if (ret == MSG_TIMEOUT) {
sg_size_t remaining = (sg_size_t)MSG_task_get_remaining_communication(task);
sent = size - remaining;
- XBT_INFO("timeout (%lf s) in sending_migration_data, remaining %llu bytes of %llu",
- timeout, remaining, size);
+ 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_INFO("SRC host failed during migration of %s (stage %d)", sg_host_name(vm), stage);
+ //XBT_DEBUG("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_get_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);
+ //XBT_DEBUG("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_get_name(vm), stage);
}
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);
+ 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);
+ XBT_DEBUG("mig-stage%d: sent %llu duration %f actual_speed %f (target %f)",
+ stage, size, duration, actual_speed, mig_speed);
return sent;
}
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);
+ // 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 (sg_size_t) updated_size;
}
-static double send_stage1(struct migration_session *ms,
- sg_size_t ramsize, double mig_speed, double dp_rate, double dp_cap)
+static double send_stage1(struct migration_session *ms, sg_size_t ramsize, double mig_speed, double dp_rate,
+ double dp_cap)
{
-
// 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;
return computed_total;
}
-
-
static double get_threshold_value(double bandwidth, double max_downtime)
{
return max_downtime * bandwidth;
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 =
- (migration_session *) MSG_process_get_data(MSG_process_self());
+ migration_session *ms = (migration_session *) MSG_process_get_data(MSG_process_self());
s_vm_params_t params;
- ms->vm->getParams(¶ms);
+ ms->vm->parameters(¶ms);
const sg_size_t ramsize = params.ramsize;
const sg_size_t devsize = params.devsize;
const int skip_stage1 = params.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 tranfer exceeds the timeout
- * value. */
- XBT_INFO("Stage 1: Gonna send %llu", ramsize);
+ /* 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", 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_INFO("mig-stage1: timeout, force moving to stage 3");
+ XBT_VERB("mig-stage1: timeout, force moving to stage 3");
skip_stage2 = 1;
} else if (sent > ramsize)
XBT_CRITICAL("bug");
} CATCH_ANONYMOUS {
- //hostfailure (if you want to know whether this is the SRC or the DST please check directly in send_migration_data code)
+ //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_INFO("The duration of stage 1 exceeds the timeout value (%lf > %lf), skip stage 2",
+ XBT_VERB("The duration of stage 1 exceeds the timeout value (%lf > %lf), skip stage 2",
(clock_post_send - clock_prev_send), MIGRATION_TIMEOUT_DO_NOT_HARDCODE_ME);
skip_stage2 = 1;
}
}
- /* Stage2: send update pages iteratively until the size of remaining states
- * becomes smaller than the threshold value. */
+ /* Stage2: send update pages iteratively until the size of remaining states becomes smaller than threshold value. */
if (! skip_stage2) {
int stage2_round = 0;
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 */
+ /* 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);
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. */
+ /* 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);
+ sent = send_migration_data(ms->vm, ms->src_pm, ms->dst_pm, updated_size, ms->mbox, 2, stage2_round, mig_speed,
+ mig_timeout);
} CATCH_ANONYMOUS {
- //hostfailure (if you want to know whether this is the SRC or the DST please check directly in send_migration_data code)
+ //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;
} 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_INFO("mig-stage2.%d: timeout, force moving to stage 3. sent %llu / %llu, eta %lf",
+ 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;
updated_size = get_updated_size(computed, dp_rate, dp_cap);
remaining_size += updated_size;
break;
-
} else
XBT_CRITICAL("bug");
}
XBT_DEBUG("Stage 3: Gonna send %f", remaining_size);
send_migration_data(ms->vm, ms->src_pm, ms->dst_pm, (sg_size_t)remaining_size, ms->mbox, 3, 0, mig_speed, -1);
} CATCH_ANONYMOUS {
- //hostfailure (if you want to know whether this is the SRC or the DST please check directly in send_migration_data code)
+ //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)
simcall_vm_resume(ms->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.
+ // 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->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);
}
#endif
- /* wait until the migration have finished or on error has occured */
+ /* 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 = NULL;
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)");
- //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
+ // 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
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)");
+ 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)");
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);
}
}
-
-
-
/** @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.
+ * 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
+ * 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?
+ * 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.
+ * 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 = (msg_host_t) simcall_vm_get_pm(vm);
if(MSG_host_is_off(old_pm))
THROWF(vm_error, 0, "SRC host(%s) seems off, cannot start a migration", sg_host_get_name(old_pm));
-
+
if(MSG_host_is_off(new_pm))
THROWF(vm_error, 0, "DST host(%s) seems off, cannot start a migration", sg_host_get_name(new_pm));
-
+
if (!MSG_vm_is_running(vm))
THROWF(vm_error, 0, "VM(%s) is not running", sg_host_get_name(vm));
priv->is_migrating = 1;
{
-
int ret = do_migration(vm, old_pm, new_pm);
if (ret == -1){
priv->is_migrating = 0;
}
}
- // 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.
+ // 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);
//TRACE_msg_vm_change_host(vm, old_pm, new_pm);
}
-
/** @brief Immediately suspend the execution of all processes within the given VM.
* @ingroup msg_VMs
*
TRACE_msg_vm_suspend(vm);
}
-
/** @brief Resume the execution of the VM. All processes on the VM run again.
* @ingroup msg_VMs
*
* 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
- * of VM save to you.
+ * 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)
{
/** @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.
+ * 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_restore(msg_vm_t vm)
{
TRACE_msg_vm_restore(vm);
}
-
/** @brief Get the physical host of a given VM.
* @ingroup msg_VMs
*/
return (msg_host_t) simcall_vm_get_pm(vm);
}
-
/** @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.
+ * 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.
* 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.
+ * 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.
*
- * The current solution is to use MSG_vm_set_bound(), which allows us to
- * directly set the bound of the dummy CPU action.
+ * 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.
+ * 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)
{
simcall_vm_set_bound(vm, bound);
}
-
/** @brief Set the CPU affinity of a given VM.
* @ingroup msg_VMs
*
