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Node.py
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Node.py
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import numpy as np
from Buffer import Buffer
from BittideFrame import BittideFrame
class Output:
def __init__(self, nextStep, phase, messages):
self.nextStep = nextStep
self.phase=phase
self.messages = messages
def getSendMessage(timestamp, output_signals, sender_phys_time) -> BittideFrame: #data sent to the simulated medium
newSendFrame = BittideFrame(sender_timestamp = timestamp, sender_phys_time=sender_phys_time, signals=output_signals)
return newSendFrame
class Node:
def __init__(self, name, buffers, initialFreq, server, outgoing_links):
self.name = name
self.controller = None
self.runtime_interchanger = None
self.server = server
self.initialFreq = initialFreq
self.freq = initialFreq
self.phase = 0
# data collection
self.last_step_time = 0
self.last_jitter = 0
self.last_period = 0
self.lastWasSkip = False
#
self.current_delays = {}
self.outgoing_links = outgoing_links
self.backpressure_links = {}
for outgoing_link in self.outgoing_links:
target_link = self.outgoing_links[outgoing_link]
self.backpressure_links[target_link.destNode] = 0
self.buffers = {}
self.inactive_buffers = 0
self.node_enabled = False
for buffer in buffers:
self.inactive_buffers += 1
self.buffers[buffer.remoteNode] = (Buffer(buffer.size, buffer.initialOcc, name, buffer.remoteNode, server))
self.current_delays[(name, buffer.remoteNode)] = 0
def set_controller(self,controller):
self.controller = controller
def set_runtime_interchanger(self, runtime_interchanger):
self.runtime_interchanger = runtime_interchanger
def buffer_receive(self, index, value):
try:
if not self.buffers[index].live:
self.inactive_buffers -= 1
if not self.node_enabled and self.inactive_buffers == 0:
self.node_enabled = True
for buffer in self.buffers:
self.buffers[buffer].running = True
self.buffers[index].receive(value)
except:
print("No inbound buffer with index " + str(index) + " at node " + self.name)
def backpressure_update(self, source_node, timestamp):
#print("Updating backpressure value of " + str(timestamp) + " from node " + source_node + " to " + self.name)
self.backpressure_links[source_node] = timestamp
def step(self, steptime):
# print(self.name)
if (self.controller is None) and (self.runtime_interchanger is None):
print("Step attempted without an assigned controller! Exiting...")
exit(0)
if self.runtime_interchanger is not None:
controlResult = self.runtime_interchanger.step(self)
else: controlResult = self.controller.step(self.buffers)
self.freq += controlResult.freq_correction
if controlResult.do_tick:
#telemetry###
recent_period = steptime - self.last_step_time
self.last_jitter = abs(recent_period - self.last_period)
self.last_period = recent_period
self.last_step_time = steptime
#############
if self.node_enabled:
self.phase += 1
if (self.freq < 0.01): self.freq = 0.01 #cap negative frequencies to prevent negative time deltas
all_inputs_to_fsm = []
#first during a tick, we provide the local (networked) machine with some inputs from the head of our buffer
for buffer in self.buffers:
inboundBuff : BittideFrame = self.buffers[buffer].pop()
if inboundBuff is None: #system crash
return None
if inboundBuff.sender_timestamp != -1:
self.current_delays[self.buffers[buffer].getId()] = self.phase - inboundBuff.sender_timestamp
# print(self.name + "->" + buffer + ", " + str(self.phase - inboundBuff.sender_timestamp))
else: self.current_delays[self.buffers[buffer].getId()] = 0
all_inputs_to_fsm.extend(inboundBuff.signals)
self.buffers[buffer].add_latency_measurement(steptime-inboundBuff.sender_phys_time)
#now we run the tick on the networked node:
if (self. server is not None):
outputs_from_fsm = self.server.run_node_tick(self.name, all_inputs_to_fsm)
else:
outputs_from_fsm = []
sent_frame = getSendMessage(self.phase, outputs_from_fsm, steptime)
self.lastWasSkip = False
return Output(1 / self.freq, self.phase, sent_frame)
else:
self.lastWasSkip = True
return Output(1 / self.freq, self.phase, None)
def get_frequency(self):
if self.lastWasSkip:
return 0
return self.freq
def get_logical_delays(self):
delays = []
for buffer in self.buffers:
delays.append(self.current_delays[self.buffers[buffer].getId()])
return delays
def get_occupancies(self):
occupancies = []
for buffer in self.buffers:
occupancies.append(self.buffers[buffer].get_occupancy())
return occupancies
def get_latencies(self):
latencies = []
for buffer in self.buffers:
latencies.append(self.buffers[buffer].last_latency)
return latencies
def get_occupancies_as_percent(self):
occupancies = []
for buffer in self.buffers:
occupancies.append(self.buffers[buffer].get_occupancy_as_percent())
return occupancies
def get_average_occupancy(self):
buffer_vals = []
for buffer in self.buffers:
if self.buffers[buffer].running == True:
buffer_vals.append(self.buffers[buffer].get_occupancy())
if len(buffer_vals) == 0: return None
else: return np.mean(buffer_vals)
def get_average_occupancy_as_percent(self):
buffer_vals = []
for buffer in self.buffers:
if self.buffers[buffer].running == True:
buffer_vals.append(self.buffers[buffer].get_occupancy_as_percent())
if len(buffer_vals) == 0: return None
else: return np.mean(buffer_vals)