msg_vm_t MSG_vm_get_by_name(const char *name)
{
- return MSG_get_host_by_name(name);
+ return MSG_get_host_by_name(name);
}
/** \ingroup m_vm_management
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;
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;
+ 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
+ if (ret != MSG_OK) {
+ // 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;
+ 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)
break;
}
- // Here Stage 1, 2 and 3 have been performed.
+ // 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_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
/* Update the vm location */
simcall_vm_migrate(vm, dst_pm);
-
+
/* Resume the VM */
simcall_vm_resume(vm);
#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
{
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);
+ // 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);
- }
+ // 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_dict_foreach(priv->dp_objs, cursor, key, dp) {
double remaining = MSG_task_get_remaining_computation(dp->task);
- double clock = MSG_get_clock();
+ double clock = MSG_get_clock();
// total += calc_updated_pages(key, vm, dp, remaining, clock);
total += get_computed(key, vm, dp, remaining, clock);
}
- 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)
+ static sg_size_t send_migration_data(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm,
+ sg_size_t size, char *mbox, int stage, int stage2_round, double mig_speed, double timeout)
{
+ sg_size_t sent = 0;
char *task_name = get_mig_task_name(vm, src_pm, dst_pm, stage);
msg_task_t task = MSG_task_create(task_name, 0, size, NULL);
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);
+ ret = MSG_task_send_with_timeout_bounded(task, mbox, timeout, mig_speed);
else
ret = MSG_task_send(task, mbox);
- // xbt_assert(ret == MSG_OK);
xbt_free(task_name);
+
+ if (ret == MSG_OK) {
+ sent = size;
+ } else if (ret == MSG_TIMEOUT) {
+ sg_size_t remaining = 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);
+ }
+
+ /* 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);
- 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);
+ //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
+ if (stage == 2)
+ XBT_DEBUG("mig-stage%d.%d: sent %llu duration %f actual_speed %f (target %f)", stage, stage2_round, size, duration, actual_speed, mig_speed);
+ else
+ XBT_DEBUG("mig-stage%d: sent %llu duration %f actual_speed %f (target %f)", stage, size, duration, actual_speed, mig_speed);
+ return sent;
}
- static double get_updated_size(double computed, double dp_rate, double dp_cap)
+ static sg_size_t get_updated_size(double computed, double dp_rate, double dp_cap)
{
double updated_size = computed * dp_rate;
XBT_DEBUG("updated_size %f dp_rate %f", updated_size, dp_rate);
updated_size = dp_cap;
}
- return updated_size;
+ return (sg_size_t) 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)
+ sg_size_t ramsize, double mig_speed, double dp_rate, double dp_cap)
{
// const long chunksize = (sg_size_t)1024 * 1024 * 100;
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);
+ send_migration_data(ms->vm, ms->src_pm, ms->dst_pm, datasize, ms->mbox, 1, 0, mig_speed, -1);
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;
+ return max_downtime * bandwidth;
}
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 ;)
+ // 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;
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;
+ 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 max_downtime = params.max_downtime;
- msg_vm_t vm=ms->vm;
+ /* hard code it temporally. Fix Me */
+ #define MIGRATION_TIMEOUT_DO_NOT_HARDCODE_ME 10000000.0
+ double mig_timeout = MIGRATION_TIMEOUT_DO_NOT_HARDCODE_ME;
double remaining_size = ramsize + devsize;
+ double threshold = 0.0;
+
+ /* check parameters */
+ if (ramsize == 0)
+ XBT_WARN("migrate a VM, but ramsize is zero");
- 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);
+ XBT_DEBUG("mig-stage1: remaining_size %f", remaining_size);
+ start_dirty_page_tracking(ms->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{
+ 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. */
+ 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");
+ 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)
- // Stop the dirty page tracking an return (there is no memory space to release)
- stop_dirty_page_tracking(vm);
- XBT_INFO ("Process tx migration catches an expection and thus return");
- return 0;
+ // Stop the dirty page tracking an return (there is no memory space to release)
+ stop_dirty_page_tracking(ms->vm);
+ return 0;
}
- remaining_size -= ramsize;
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",
+ (clock_post_send - clock_prev_send), MIGRATION_TIMEOUT_DO_NOT_HARDCODE_ME);
+ skip_stage2 = 1;
+ }
+
+ /* estimate bandwidth */
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);
* 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 */
+ sg_size_t updated_size = 0;
+ if (stage2_round == 0) {
+ /* just after stage1, nothing has been updated. But, we have to send the
+ * data updated during stage1 */
updated_size = get_updated_size(computed_during_stage1, dp_rate, dp_cap);
} else {
double computed = lookup_computed_flop_counts(ms->vm, 2, stage2_round);
updated_size = get_updated_size(computed, dp_rate, dp_cap);
}
- XBT_DEBUG("mig-stage 2:%d updated_size %f computed_during_stage1 %f dp_rate %f dp_cap %f",
+ 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);
- // 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);
+ /* 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;
- if (remaining_size < threshold)
- break;
- }
+ sg_size_t sent = 0;
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{
+ TRY {
+ 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)
- // Stop the dirty page tracking an return (there is no memory space to release)
- XBT_INFO ("Process tx migration catches an expection and thus return");
- stop_dirty_page_tracking(vm);
- return 0;
+ // 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();
- 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);
+ if (sent == updated_size) {
+ /* timeout did not happen */
+ 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 -= sent;
+ stage2_round += 1;
+ mig_timeout -= (clock_post_send - clock_prev_send);
+ xbt_assert(mig_timeout > 0);
+
+ } else if (sent < updated_size) {
+ /* When timeout happens, we move to stage 3. The size of memory pages
+ * updated before timeout must be added to the remaining size. */
+ XBT_INFO("mig-stage2.%d: timeout, force moving to stage 3. sent %llu / %llu, eta %lf",
+ stage2_round, sent, updated_size, (clock_post_send - clock_prev_send));
+ remaining_size -= sent;
+ double computed = lookup_computed_flop_counts(ms->vm, 2, stage2_round);
+ updated_size = get_updated_size(computed, dp_rate, dp_cap);
+ remaining_size += updated_size;
+ break;
- remaining_size -= updated_size;
- stage2_round += 1;
+ } else
+ XBT_CRITICAL("bug");
}
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)
- XBT_INFO ("Process tx migration catches an expection and thus return");
- 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.
+ simcall_vm_suspend(ms->vm);
+ stop_dirty_page_tracking(ms->vm);
+
+ TRY {
+ send_migration_data(ms->vm, ms->src_pm, ms->dst_pm, 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)
+ // Stop the dirty page tracking an return (there is no memory space to release)
+ simcall_vm_resume(ms->vm);
+ return 0;
+ }
-
- XBT_DEBUG("mig: tx_done");
+ // 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_INFO("mig: tx_done");
return 0;
}
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_t tx_process, rx_process;
// 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);
+ rx_process = 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);
+ tx_process = MSG_process_create_with_arguments(pr_tx_name, migration_tx_fun, ms, src_pm, 1, argv);
}
#endif
{
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 ok
- // Active waiting, evaluation is performed every one second.
- ret = MSG_task_receive_with_timeout(&task, ms->mbox_ctl, 1);
+ 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);
++ ret = MSG_task_receive_with_timeout(&task, ms->mbox_ctl, 3);
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;
- }
+ XBT_INFO("SRC crashes, throw an exception (m-control)");
- MSG_process_kill(tx_process);
++ 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)");
- return -2;
+ 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;
+ return 0;
}
}
* physical host.
*
* The second one would be easier.
- *
+ *
*/
msg_host_t old_pm = simcall_vm_get_pm(vm);
priv->is_migrating = 1;
{
-
- int ret = do_migration(vm, old_pm, new_pm);
+
+ 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){
+ else if(ret == -2){
priv->is_migrating = 0;
THROWF(host_error, 0, "DST host failed during migration");
}
* 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,
+ * Then,
* Task1\@PM0 gets 50%.
* Task2\@VM0 gets 25%.
* This is NOT 75% for Task1\@PM0 and 25% for Task2\@VM0, respectively.
*/
void MSG_vm_set_bound(msg_vm_t vm, double bound)
{
- return simcall_vm_set_bound(vm, bound);
+ return simcall_vm_set_bound(vm, bound);
}
