class ProcessingUnit(FiniteStateMachine):
"""
Processing unit model for xDEVS
:param str name: name of the XDEVS module
:param ProcessingUnitConfiguration pu_config: Processing Unit Configuration
:param str rack_id: ID of the rack that contains the processing unit
:param int pu_index: processing unit corresponding index within the EDC
:param dict services_config: dictionary with the configuration of every service in the scenario
:param float env_temp: Processing unit base temperature (in Kelvin)
"""
pu_power_factory = ProcessingUnitPowerModelFactory()
pu_temp_factory = ProcessingUnitTemperatureModelFactory()
def __init__(self, name, pu_config, rack_id, pu_index, services_config, env_temp=298):
# Unwrap configuration parameters
self.pu_id = pu_config.p_unit_id
self.dvfs_table = pu_config.dvfs_table
self.max_u = pu_config.max_u
self.max_start_stop = pu_config.max_start_stop
self.t_on = pu_config.t_on
self.t_off = pu_config.t_off
self.t_start = pu_config.t_start
self.t_stop = pu_config.t_stop
self.t_operation = pu_config.t_operation
power_model_name = pu_config.power_model_name
power_model_config = pu_config.power_model_config
self.power_model = self.pu_power_factory.create_model(power_model_name, **power_model_config)
temp_model_name = pu_config.temp_model_name
temp_model_config = pu_config.temp_model_config
self.temp_model = self.pu_temp_factory.create_model(temp_model_name, **temp_model_config)
# dictionary that contains how much computing resources require a single session of a given service
self.services_u = {service_id: service_conf.service_u for service_id, service_conf in services_config.items()}
# Set status attributes
self.rack_id = rack_id # ID of the rack that contains the processing unit
self.pu_index = pu_index # corresponding index of the PU within the rack of the EDC
self.status = False # PU status. By default, all the PUs start powered off
self.dvfs_mode = False # DVFS mode. By default, it is not activated
self.dvfs_index = 0 # index of current DVFS configuration
self.utilization = 0.0 # utilization factor
self.u_per_service = dict() # utilization factor splitted by service {service_id: utilization}
self.ongoing_sessions = dict() # ongoing sessions {service_id: [session_id]}
self.power = 0 # PU required power consumption
self.env_temp = env_temp # Environment temperature of the processing unit
self.temperature = env_temp # PU temperature of PU. Initially, it is set to env_temp
self.start_buffer = deque() # Buffer of sessions that require to be started
self.stop_buffer = deque() # Buffer of sessions that require to be stopped
self.starting = list() # Sessions that are being started
self.acking = list() # Requests of ongoing sessions that are being processed
self.removing = list() # Sessions that are being stopped
self.open_tasks = dict() # Event schedule for services being started
self.ongoing_tasks = dict() # Event schedule for ongoing services that are processing requests
self.close_tasks = dict() # Event schedule for services being stopped
# FSM stuff
int_table = {
PHASE_START: self.internal_phase_off,
PHASE_OFF: self.internal_phase_off,
PHASE_TO_OFF: self.internal_phase_off,
PHASE_ON: self.internal_phase_on,
PHASE_BUSY: self.internal_phase_on,
PHASE_TO_ON: self.internal_phase_on,
}
ext_table = {
PHASE_START: None,
PHASE_OFF: self.external_phase_off,
PHASE_ON: self.external_phase_on,
PHASE_BUSY: self.external_phase_on,
PHASE_TO_OFF: None,
PHASE_TO_ON: None,
}
lambda_table = {phase: None for phase in P_UNIT_PHASES}
lambda_table[PHASE_START] = self.lambda_send_pu_report
lambda_table[PHASE_BUSY] = self.lambda_send_tasks
initial_state = PHASE_START
initial_timeout = 0
super().__init__(P_UNIT_PHASES, int_table, ext_table, lambda_table, initial_state, initial_timeout, name)
# I/O ports
self.input_change_status = Port(ChangeStatus, name + '_input_change_status')
self.input_set_dvfs_mode = Port(SetDVFSMode, name + '_input_set_dvfs_mode')
self.input_open_session = Port(OpenSessionRequest, name + '_input_open_session')
self.input_ongoing_session = Port(OngoingSessionRequest, name + '_input_ongoing_session')
self.input_close_session = Port(CloseSessionRequest, name + '_input_close_session')
self.output_p_unit_report = Port(ProcessingUnitReport, name + '_output_p_unit_report')
self.output_change_status_response = Port(ChangeStatusResponse, name + '_output_change_status_response')
self.output_set_dvfs_mode_response = Port(SetDVFSModeResponse, name + '_output_set_dvfs_mode_response')
self.output_open_session_response = Port(OpenSessionResponse, name + '_output_create_session_response')
self.output_ongoing_session_response = Port(OngoingSessionResponse, name + '_output_ongoing_session_response')
self.output_close_session_response = Port(CloseSessionResponse, name + '_output_remove_session_response')
self.add_in_port(self.input_change_status) # port for incoming change status messages
self.add_in_port(self.input_set_dvfs_mode) # port for incoming new DVFS mode messages
self.add_in_port(self.input_open_session) # port for incoming create session messages
self.add_in_port(self.input_ongoing_session) # port for incoming ongoing session messages
self.add_in_port(self.input_close_session) # port for incoming remove session messages
self.add_out_port(self.output_p_unit_report) # port for leaving processing unit report messages
self.add_out_port(self.output_change_status_response) # port for leaving change status response messages
self.add_out_port(self.output_set_dvfs_mode_response) # port for leaving new DVFS mode response messages
self.add_out_port(self.output_open_session_response) # port for leaving open session response messages
self.add_out_port(self.output_ongoing_session_response) # port for leaving ongoing session response messages
self.add_out_port(self.output_close_session_response) # port for leaving close session response messages
@staticmethod
def add_response_to_queue(queue, t, msg):
if t not in queue:
queue[t] = list()
queue[t].append(msg)
def internal_phase_on(self):
# Trigger pending close service processes
while self.stop_buffer and self.enough_size():
service_id, session_id = self.stop_buffer.popleft()
self.removing.append((service_id, session_id))
t = self._clock + self.t_stop
msg = CloseSessionResponse(self.rack_id, self.pu_index, service_id, session_id, True)
self.add_response_to_queue(self.close_tasks, t, msg)
# Trigger pending open service processes
delta = sum([self.services_u[service_id] for service_id, session_id in self.starting])
while self.start_buffer and self.enough_size():
service_id, session_id = self.start_buffer[0]
utilization = self.services_u[service_id]
# Check that there are enough available resources before triggering new services
if self.utilization + delta + utilization <= self.max_u:
delta += utilization
service_id, session_id = self.start_buffer.popleft()
self.starting.append((service_id, session_id))
t = self._clock + self.t_start
msg = OpenSessionResponse(self.rack_id, self.pu_index, service_id, session_id, True)
self.add_response_to_queue(self.open_tasks, t, msg)
# Otherwise, it is required to wait until other services are removed before adding new service to the queue
else:
break
# Compute next event
min_ongoing = min(self.ongoing_tasks) - self._clock if self.ongoing_tasks else INFINITY
min_open = min(self.open_tasks) - self._clock if self.open_tasks else INFINITY
min_close = min(self.close_tasks) - self._clock if self.close_tasks else INFINITY
next_event = min(min_ongoing, min_open, min_close)
next_phase = PHASE_BUSY if next_event < INFINITY else PHASE_ON
return next_phase, next_event
@staticmethod
def internal_phase_off():
return PHASE_OFF, INFINITY
def external_phase_off(self):
"""Operations to perform in phase OFF"""
overhead = logging_overhead(self._clock, LOGGING_OVERHEAD)
next_phase = PHASE_OFF
next_timeout = 0
report = False
# CASE 1: Processing unit received set DVFS mode message
if self.input_set_dvfs_mode:
dvfs = self._check_set_dvfs_mode_port(overhead)
if dvfs != self.dvfs_mode:
self.dvfs_mode = dvfs
report = True
msg = SetDVFSModeResponse(self.rack_id, self.pu_index, dvfs, True)
self.add_msg_to_queue(self.output_set_dvfs_mode_response, msg)
# CASE 2: Processing Unit received change status (switch on) message
elif self.input_change_status:
status = self._check_change_status_port(overhead)
if status:
self.status = status
report = True
next_phase = PHASE_TO_ON
next_timeout = self.t_on
msg = ChangeStatusResponse(self.rack_id, self.pu_index, status, True)
self.add_msg_to_queue(self.output_change_status_response, msg)
else:
self._off_affirmative_stops(overhead)
self._off_negative_ongoings(overhead)
self._off_negative_starts(overhead)
# Send report if required
if report:
self._refresh_properties()
self.send_pu_report()
return next_phase, next_timeout
def external_phase_on(self):
"""Operations to perform in phase ON"""
overhead = logging_overhead(self._clock, LOGGING_OVERHEAD)
report = False
# CASE 1: Any service-related request
self._check_ongoing_session_requests(overhead)
self._check_close_session_requests(overhead)
self._check_open_session_requests(overhead)
next_phase, next_timeout = self.internal_phase_on()
# If no events are scheduled, then we can change the DVFS mode or the status
if next_phase == PHASE_ON:
# CASE 2: Processing Unit received change status message
if self.input_change_status:
next_timeout = 0
status = self._check_change_status_port(overhead)
response = status
if not status and not self.ongoing_sessions and not self.starting:
self.status = status
response = True
report = True
next_phase = PHASE_TO_OFF
next_timeout = self.t_off
# Add response to queue
msg = ChangeStatusResponse(self.rack_id, self.pu_index, status, response)
self.add_msg_to_queue(self.output_change_status_response, msg)
# CASE 3: Processing unit received set DVFS mode message
elif self.input_set_dvfs_mode:
next_timeout = 0
dvfs = self._check_set_dvfs_mode_port(overhead)
if dvfs != self.dvfs_mode:
self.dvfs_mode = dvfs
report = True
msg = SetDVFSModeResponse(self.rack_id, self.pu_index, dvfs, True)
self.add_msg_to_queue(self.output_set_dvfs_mode_response, msg)
if report:
self._refresh_properties()
self.send_pu_report()
return next_phase, next_timeout
def lambda_send_pu_report(self):
self.send_pu_report()
def lambda_send_tasks(self):
ongoing_due = self.ongoing_tasks.pop(self._clock, list())
for msg in ongoing_due:
self.add_msg_to_queue(self.output_ongoing_session_response, msg)
if msg.response:
self.acking.remove((msg.service_id, msg.session_id))
close_due = self.close_tasks.pop(self._clock, list())
needs_report = False
for msg in close_due:
if msg.response:
needs_report |= self.remove_session(msg.service_id, msg.session_id)
self.add_msg_to_queue(self.output_close_session_response, msg)
open_due = self.open_tasks.pop(self._clock, list())
for msg in open_due:
if msg.response:
needs_report |= self.create_session(msg.service_id, msg.session_id)
self.add_msg_to_queue(self.output_open_session_response, msg)
if needs_report:
self._refresh_properties()
self.send_pu_report()
def _check_change_status_port(self, overhead):
"""
Checks the change status port
:param str overhead: logging overhead
:return bool: new requested status
"""
if self.input_change_status:
status = self.input_change_status.get().status
logging.info(overhead + "%s received change status->%s message" % (self.name, status))
if not status and (self.ongoing_sessions or self.open_tasks):
logging.warning(overhead + " Impossible to switch off. Sending negative response.")
return status
def _check_set_dvfs_mode_port(self, overhead):
"""
Checks the DVFS mode port
:param str overhead: logging overhead
:return bool: result of the operation
"""
if self.input_set_dvfs_mode:
dvfs_mode = self.input_set_dvfs_mode.get().dvfs_mode
logging.info(overhead + "%s received set DVFS mode->%r message" % (self.name, dvfs_mode))
return dvfs_mode
def _check_ongoing_session_requests(self, overhead):
"""
Checks the close session port
:param str overhead: logging overhead
:return str, str: pxsch ID and session ID
"""
for msg in self.input_ongoing_session.values:
service_id = msg.service_id
session_id = msg.session_id
packet_id = msg.packet_id
logging.info(overhead + "%s received ongoing session->(%s,%s,%s) request" % (self.name, service_id,
session_id, str(packet_id)))
res = service_id in self.ongoing_sessions and session_id in self.ongoing_sessions[service_id]
t = self._clock
if res:
if (service_id, session_id) in self.removing or (service_id, session_id) in self.stop_buffer:
res = False
logging.warning(overhead + " session is being removed. Sending negative response.")
else:
self.acking.append((service_id, session_id))
t += self.t_operation
else:
logging.warning(overhead + " session not found. Sending negative response.")
msg = OngoingSessionResponse(self.rack_id, self.pu_index, service_id, session_id, packet_id, res)
self.add_response_to_queue(self.ongoing_tasks, t, msg)
def _check_close_session_requests(self, overhead):
"""
Checks the close session port
:param str overhead: logging overhead
:return str, str: service ID and session ID
"""
for msg in self.input_close_session.values:
service_id = msg.service_id
session_id = msg.session_id
logging.info(overhead + "%s received close session->(%s,%s) request" % (self.name, service_id, session_id))
res = service_id in self.ongoing_sessions and session_id in self.ongoing_sessions[service_id]
if res:
if (service_id, session_id) in self.removing or (service_id, session_id) in self.stop_buffer:
logging.warning(overhead + " session is already being removed. Ignoring request.")
elif (service_id, session_id) in self.acking:
logging.warning(overhead + " session is busy. Sending negative response.")
msg = CloseSessionResponse(self.rack_id, self.pu_index, service_id, session_id, False)
self.add_response_to_queue(self.close_tasks, self._clock, msg)
else:
self.stop_buffer.append((service_id, session_id))
else:
logging.warning(overhead + " session not found. Sending affirmative response.")
msg = CloseSessionResponse(self.rack_id, self.pu_index, service_id, session_id, True)
self.add_response_to_queue(self.close_tasks, self._clock, msg)
def _check_open_session_requests(self, overhead):
"""
Checks the open session port
:param str overhead: logging overhead
:return str, str, float: pxsch ID, session ID and std_u factor to be used
"""
delta = self._initial_delta()
for msg in self.input_open_session.values:
service_id = msg.service_id
session_id = msg.session_id
logging.info(overhead + "%s received open session->(%s,%s) request" % (self.name, service_id, session_id))
service_u = self.services_u[service_id]
if (service_id, session_id) in self.starting:
logging.warning(overhead + " Session is already being created. Ignoring request.")
elif service_id in self.ongoing_sessions and session_id in self.ongoing_sessions[service_id]:
logging.warning(overhead + " Session already exists. Sending affirmative response.")
msg = OpenSessionResponse(self.rack_id, self.pu_index, service_id, session_id, True)
self.add_response_to_queue(self.open_tasks, self._clock, msg)
elif 0 <= service_u <= self.max_u - self.utilization - delta:
delta += service_u
self.start_buffer.append((service_id, session_id))
else:
logging.warning(overhead + " Unable to create session. Sending negative response.")
msg = OpenSessionResponse(self.rack_id, self.pu_index, service_id, session_id, False)
self.add_response_to_queue(self.open_tasks, self._clock, msg)
def _initial_delta(self):
delta = 0
for service_id, session_id in self.starting:
delta += self.services_u[service_id]
for service_id, session_id in self.start_buffer:
delta += self.services_u[service_id]
for service_id, session_id in self.removing:
delta -= self.services_u[service_id]
for service_id, session_id in self.stop_buffer:
delta -= self.services_u[service_id]
return delta
def enough_size(self):
return self.max_start_stop <= 0 or self.max_start_stop > len(self.starting) + len(self.removing)
def _off_negative_ongoings(self, overhead):
for msg in self.input_ongoing_session.values:
service_id = msg.service_id
session_id = msg.session_id
packet_id = msg.packet_id
logging.info(overhead + "%s received ongoing session->(%s,%s,%s) request" % (self.name, service_id,
session_id, str(packet_id)))
logging.warning(overhead + " PU is switched off. Sending Negative response.")
msg = OngoingSessionResponse(self.rack_id, self.pu_index, service_id, session_id, packet_id, False)
self.add_msg_to_queue(self.output_ongoing_session_response, msg)
def _off_affirmative_stops(self, overhead):
for msg in self.input_close_session.values:
service_id = msg.service_id
session_id = msg.session_id
logging.info(overhead + "%s received close session->(%s,%s) request" % (self.name, service_id, session_id))
logging.warning(overhead + " PU is switched off. Sending affirmative response.")
msg = CloseSessionResponse(self.rack_id, self.pu_index, service_id, session_id, True)
self.add_msg_to_queue(self.output_close_session_response, msg)
def _off_negative_starts(self, overhead):
for msg in self.input_open_session.values:
service_id = msg.service_id
session_id = msg.session_id
logging.info(overhead + "%s received create session->(%s,%s) request" % (self.name, service_id, session_id))
logging.warning(overhead + " PU is switched off. Sending Negative response.")
msg = OpenSessionResponse(self.rack_id, self.pu_index, service_id, session_id, False)
self.add_msg_to_queue(self.output_open_session_response, msg)
def remove_session(self, service_id, session_id):
"""
Removes an ongoing task and frees resources
:param str service_id: ID of the pxsch to be removed
:param str session_id: ID of the session to be removed
"""
res = False
if service_id in self.ongoing_sessions:
if session_id in self.ongoing_sessions[service_id]:
res = True
self.removing.remove((service_id, session_id))
self.ongoing_sessions[service_id].remove(session_id)
if not self.ongoing_sessions[service_id]:
self.ongoing_sessions.pop(service_id)
return res
def ack_session(self, service_id, session_id):
self.acking.remove((service_id, session_id))
def create_session(self, service_id, session_id):
"""
Earmarks resources for new incoming task
:param str service_id: ID of the task to be processed
:param str session_id: ID of the task to be processed
"""
res = False
if service_id not in self.ongoing_sessions:
self.ongoing_sessions[service_id] = list()
if session_id not in self.ongoing_sessions[service_id]:
res = True
self.starting.remove((service_id, session_id))
self.ongoing_sessions[service_id].append(session_id)
return res
def _refresh_properties(self):
"""Refreshes the values of the processing unit"""
self.__compute_utilization()
self.__compute_dvfs_index()
self.__compute_power()
self.__compute_temperature()
def __compute_utilization(self):
"""Computes std_u factor of the processing unit"""
utilization = 0
u_per_service = dict()
for service_id, sessions in self.ongoing_sessions.items():
u = self.services_u[service_id] * len(sessions)
u_per_service[service_id] = u
utilization += u
self.utilization = utilization
self.u_per_service = u_per_service
def __compute_dvfs_index(self):
"""Computes the DVFS table index that fits the best"""
# CASE 1: processing unit is switched off -> DVFS index set to 0
if not self.status:
self.dvfs_index = 0
# CASE 2: DVFS mode is set to false -> DVFS index set to 100
elif not self.dvfs_mode:
self.dvfs_index = 100
# CASE 3: DVFS mode is set to true -> find lowest DVFS index that fulfills computing requirements
else:
relative_u = self.utilization / self.max_u * 100
self.dvfs_index = min([i for i in self.dvfs_table if i >= relative_u])
def __compute_power(self):
"""Computes the processing unit power consumption"""
try:
self.power = self.power_model.compute_power(self.status, self.utilization, self.max_u, self.dvfs_index,
self.dvfs_table)
except AttributeError:
self.power = 0
def __compute_temperature(self):
"""Computes the processing unit temperature"""
try:
self.temperature = self.temp_model.compute_temperature(self.status, self.utilization, self.max_u,
self.dvfs_index, self.dvfs_table)
except AttributeError:
self.temperature = self.env_temp
def send_pu_report(self):
ongoing_sessions = {service_id: [session_id for session_id in sessions]
for service_id, sessions in self.ongoing_sessions.items()}
u_per_service = {service_id: u for service_id, u in self.u_per_service.items()}
msg = ProcessingUnitReport(self.rack_id, self.pu_index, self.pu_id, self.max_u, self.max_start_stop,
self.status, self.dvfs_mode, self.dvfs_index, self.utilization, self.power,
self.temperature, ongoing_sessions, u_per_service)
self.add_msg_to_queue(self.output_p_unit_report, msg)
class Transport(Stateless):
def __init__(self, name, ap_id):
super().__init__(name=name)
self.ap_id = ap_id
self.service_routing = dict()
self.ue_connected = list()
self.input_new_sdn_path = Port(NewSDNPath,
name + '_input_new_sdn_path')
self.input_connected_ue_list = Port(EnableChannels,
name + '_input_connected_ue_list')
self.input_service_routing_request = Port(
GetDataCenterRequest, name + '_input_service_routing_request')
self.input_radio = Port(NetworkPacket, name + '_input_radio')
self.input_crosshaul = Port(NetworkPacket, name + '_input_crosshaul')
self.output_service_routing_response = Port(
GetDataCenterResponse, name + '_output_service_routing_response')
self.output_crosshaul = Port(NetworkPacket, name + '_output_crosshaul')
self.output_radio = Port(NetworkPacket, name + '_output_radio')
self.add_in_port(self.input_new_sdn_path)
self.add_in_port(self.input_connected_ue_list)
self.add_in_port(self.input_service_routing_request)
self.add_in_port(self.input_radio)
self.add_in_port(self.input_crosshaul)
self.add_out_port(self.output_service_routing_response)
self.add_out_port(self.output_crosshaul)
self.add_out_port(self.output_radio)
def check_in_ports(self):
self._process_new_connected_ue_list()
self._process_new_sdn_path()
self._process_service_routing()
self._process_radio_messages()
self._process_crosshaul_messages()
def process_internal_messages(self):
pass
def _process_new_connected_ue_list(self):
if self.input_connected_ue_list:
ue_list = self.input_connected_ue_list.get().nodes_to
self.ue_connected = [ue for ue in ue_list]
def _process_new_sdn_path(self):
if self.input_new_sdn_path:
sdn_path = self.input_new_sdn_path.get()
overhead = logging_overhead(self._clock, LOGGING_OVERHEAD)
logging.info(overhead +
'%s<---SDN Controller: new SDN path' % self.ap_id)
self.service_routing = {
service_id: dc
for service_id, dc in sdn_path.service_route.items()
}
def _process_service_routing(self):
overhead = logging_overhead(self._clock, "")
for msg in self.input_service_routing_request.values:
ue_id = msg.ue_id
service_id = msg.service_id
logging.info(overhead + '%s-->%s: service %s routing request' %
(ue_id, self.ap_id, service_id))
if ue_id not in self.ue_connected:
logging.warning(
overhead +
' message from disconnected UE %s. Ignoring request' %
ue_id)
continue
dc_id = self.service_routing.get(service_id, None)
if dc_id is None:
logging.warning(
overhead +
' no service routing for %s. Ignoring request' %
service_id)
else:
app_msg = GetDataCenterResponse(ue_id, service_id, dc_id,
msg.header)
self.add_msg_to_queue(self.output_service_routing_response,
app_msg)
def _process_radio_messages(self):
overhead = logging_overhead(self._clock, "")
for msg in self.input_radio.values:
ue_id = msg.node_from
service_id = msg.data.service_id
logging.info(overhead + '%s--->%s: %s-related message' %
(ue_id, self.ap_id, service_id))
if ue_id not in self.ue_connected:
logging.warning(
overhead +
' message from disconnected UE %s. Ignoring request' %
ue_id)
continue
self.add_msg_to_queue(self.output_crosshaul, msg)
def _process_crosshaul_messages(self):
overhead = logging_overhead(self._clock, LOGGING_OVERHEAD)
for msg in self.input_crosshaul.values:
ue_id = msg.node_to
dc_id = msg.node_from
service_id = msg.data.service_id
logging.info(overhead + '%s<---%s: %s-related message' %
(self.ap_id, dc_id, service_id))
if ue_id not in self.ue_connected:
logging.warning(
overhead +
' message to disconnected UE %s. Ignoring request' %
ue_id)
continue
self.add_msg_to_queue(self.output_radio, msg)
