501 lines
21 KiB
Python
501 lines
21 KiB
Python
#!/bin/python3
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import random
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import collections
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import logging
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from DAS.block import *
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from DAS.tools import shuffled, shuffledDict, unionOfSamples
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from bitarray.util import zeros
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from collections import deque
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from itertools import chain
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class Neighbor:
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"""This class implements a node neighbor to monitor sent and received data.
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It represents one side of a P2P link in the overlay. Sent and received
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segments are monitored to avoid sending twice or sending back what was
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received from a link.
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"""
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def __repr__(self):
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"""It returns the amount of sent and received data."""
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return "%d:%d/%d, q:%d" % (self.node.ID, self.sent.count(1), self.received.count(1), len(self.sendQueue))
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def __init__(self, v, dim, blockSize):
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"""It initializes the neighbor with the node and sets counters to zero."""
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self.node = v
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self.dim = dim # 0:row 1:col
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self.receiving = zeros(blockSize)
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self.received = zeros(blockSize)
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self.sent = zeros(blockSize)
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self.sendQueue = deque()
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class Validator:
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"""This class implements a validator/node in the network."""
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def __repr__(self):
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"""It returns the validator ID."""
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return str(self.ID)
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def __init__(self, ID, amIproposer, logger, shape, rows = None, columns = None):
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"""It initializes the validator with the logger shape and rows/columns.
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If rows/columns are specified these are observed, otherwise (default)
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chi rows and columns are selected randomly.
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"""
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self.shape = shape
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FORMAT = "%(levelname)s : %(entity)s : %(message)s"
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self.ID = ID
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self.format = {"entity": "Val "+str(self.ID)}
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self.block = Block(self.shape.blockSize)
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self.receivedBlock = Block(self.shape.blockSize)
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self.receivedQueue = deque()
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self.sendQueue = deque()
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self.amIproposer = amIproposer
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self.logger = logger
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if self.shape.chi < 1:
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self.logger.error("Chi has to be greater than 0", extra=self.format)
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elif self.shape.chi > self.shape.blockSize:
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self.logger.error("Chi has to be smaller than %d" % self.shape.blockSize, extra=self.format)
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else:
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if amIproposer:
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self.nodeClass = 0
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self.rowIDs = range(shape.blockSize)
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self.columnIDs = range(shape.blockSize)
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else:
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#if shape.deterministic:
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# random.seed(self.ID)
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self.nodeClass = 1 if (self.ID <= shape.numberNodes * shape.class1ratio) else 2
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self.vpn = self.shape.vpn1 if (self.nodeClass == 1) else self.shape.vpn2
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self.vRowIDs = []
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self.vColumnIDs = []
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for i in range(self.vpn):
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self.vRowIDs.append(set(rows[i*self.shape.chi:(i+1)*self.shape.chi]) if rows else set(random.sample(range(self.shape.blockSize), self.shape.chi)))
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self.vColumnIDs.append(set(columns[i*self.shape.chi:(i+1)*self.shape.chi]) if columns else set(random.sample(range(self.shape.blockSize), self.shape.chi)))
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self.rowIDs = set.union(*self.vRowIDs)
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self.columnIDs = set.union(*self.vColumnIDs)
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self.rowNeighbors = collections.defaultdict(dict)
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self.columnNeighbors = collections.defaultdict(dict)
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#statistics
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self.statsTxInSlot = 0
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self.statsTxPerSlot = []
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self.statsRxInSlot = 0
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self.statsRxPerSlot = []
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self.statsRxDupInSlot = 0
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self.statsRxDupPerSlot = []
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# Set uplink bandwidth. In segments (~560 bytes) per timestep (50ms?)
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# 1 Mbps ~= 1e6 / 20 / 8 / 560 ~= 11
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# TODO: this should be a parameter
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if self.amIproposer:
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self.bwUplink = shape.bwUplinkProd
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elif self.nodeClass == 1:
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self.bwUplink = shape.bwUplink1
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else:
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self.bwUplink = shape.bwUplink2
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self.repairOnTheFly = True
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self.sendLineUntil = (self.shape.blockSize + 1) // 2 # stop sending on a p2p link if at least this amount of samples passed
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self.perNeighborQueue = True # queue incoming messages to outgoing connections on arrival (as typical GossipSub impl)
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self.shuffleQueues = True # shuffle the order of picking from active queues of a sender node
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self.perNodeQueue = False # keep a global queue of incoming messages for later sequential dispatch
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self.shuffleLines = True # shuffle the order of rows/columns in each iteration while trying to send
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self.shuffleNeighbors = True # shuffle the order of neighbors when sending the same segment to each neighbor
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self.dumbRandomScheduler = False # dumb random scheduler
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self.segmentShuffleScheduler = True # send each segment that's worth sending once in shuffled order, then repeat
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self.segmentShuffleSchedulerPersist = True # Persist scheduler state between timesteps
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def logIDs(self):
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"""It logs the assigned rows and columns."""
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if self.amIproposer == 1:
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self.logger.warning("I am a block proposer."% self.ID)
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else:
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self.logger.debug("Selected rows: "+str(self.rowIDs), extra=self.format)
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self.logger.debug("Selected columns: "+str(self.columnIDs), extra=self.format)
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def initBlock(self):
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"""It initializes the block for the proposer."""
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if self.amIproposer == 0:
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self.logger.warning("I am not a block proposer", extra=self.format)
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else:
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self.logger.debug("Creating block...", extra=self.format)
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order = [i for i in range(self.shape.blockSize * self.shape.blockSize)]
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order = random.sample(order, int((1 - self.shape.failureRate/100) * len(order)))
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for i in order:
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self.block.data[i] = 1
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nbFailures = self.block.data.count(0)
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measuredFailureRate = nbFailures * 100 / (self.shape.blockSize * self.shape.blockSize)
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self.logger.debug("Number of failures: %d (%0.02f %%)", nbFailures, measuredFailureRate, extra=self.format)
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def getColumn(self, index):
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"""It returns a given column."""
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return self.block.getColumn(index)
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def getRow(self, index):
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"""It returns a given row."""
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return self.block.getRow(index)
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def receiveSegment(self, rID, cID, src):
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"""Receive a segment, register it, and queue for forwarding as needed."""
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# register receive so that we are not sending back
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if rID in self.rowIDs:
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if src in self.rowNeighbors[rID]:
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self.rowNeighbors[rID][src].receiving[cID] = 1
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if cID in self.columnIDs:
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if src in self.columnNeighbors[cID]:
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self.columnNeighbors[cID][src].receiving[rID] = 1
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if not self.receivedBlock.getSegment(rID, cID):
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self.logger.trace("Recv new: %d->%d: %d,%d", src, self.ID, rID, cID, extra=self.format)
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self.receivedBlock.setSegment(rID, cID)
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if self.perNodeQueue or self.perNeighborQueue:
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self.receivedQueue.append((rID, cID))
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else:
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self.logger.trace("Recv DUP: %d->%d: %d,%d", src, self.ID, rID, cID, extra=self.format)
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self.statsRxDupInSlot += 1
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self.statsRxInSlot += 1
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def addToSendQueue(self, rID, cID):
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"""Queue a segment for forwarding."""
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if self.perNodeQueue:
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self.sendQueue.append((rID, cID))
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if self.perNeighborQueue:
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if rID in self.rowIDs:
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for neigh in self.rowNeighbors[rID].values():
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neigh.sendQueue.append(cID)
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if cID in self.columnIDs:
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for neigh in self.columnNeighbors[cID].values():
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neigh.sendQueue.append(rID)
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def receiveRowsColumns(self):
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"""Finalize time step by merging newly received segments in state."""
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if self.amIproposer == 1:
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self.logger.error("I am a block proposer", extra=self.format)
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else:
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self.logger.trace("Receiving the data...", extra=self.format)
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#self.logger.debug("%s -> %s", self.block.data, self.receivedBlock.data, extra=self.format)
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self.block.merge(self.receivedBlock)
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for neighs in chain (self.rowNeighbors.values(), self.columnNeighbors.values()):
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for neigh in neighs.values():
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neigh.received |= neigh.receiving
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neigh.receiving.setall(0)
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# add newly received segments to the send queue
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if self.perNodeQueue or self.perNeighborQueue:
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while self.receivedQueue:
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(rID, cID) = self.receivedQueue.popleft()
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self.addToSendQueue(rID, cID)
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def updateStats(self):
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"""It updates the stats related to sent and received data."""
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self.logger.debug("Stats: tx %d, rx %d", self.statsTxInSlot, self.statsRxInSlot, extra=self.format)
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self.statsRxPerSlot.append(self.statsRxInSlot)
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self.statsRxDupPerSlot.append(self.statsRxDupInSlot)
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self.statsTxPerSlot.append(self.statsTxInSlot)
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self.statsRxInSlot = 0
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self.statsRxDupInSlot = 0
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self.statsTxInSlot = 0
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def checkSegmentToNeigh(self, rID, cID, neigh):
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"""Check if a segment should be sent to a neighbor."""
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if (neigh.sent | neigh.received).count(1) >= self.sendLineUntil:
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return False # sent enough, other side can restore
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i = rID if neigh.dim else cID
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if not neigh.sent[i] and not neigh.received[i] :
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return True
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else:
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return False # received or already sent
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def sendSegmentToNeigh(self, rID, cID, neigh):
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"""Send segment to a neighbor (without checks)."""
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self.logger.trace("sending %d/%d to %d", rID, cID, neigh.node.ID, extra=self.format)
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i = rID if neigh.dim else cID
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neigh.sent[i] = 1
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neigh.node.receiveSegment(rID, cID, self.ID)
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self.statsTxInSlot += 1
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def checkSendSegmentToNeigh(self, rID, cID, neigh):
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"""Check and send a segment to a neighbor if needed."""
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if self.checkSegmentToNeigh(rID, cID, neigh):
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self.sendSegmentToNeigh(rID, cID, neigh)
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return True
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else:
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return False
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def processSendQueue(self):
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"""Send out segments from queue until bandwidth limit reached.
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SendQueue is a centralized queue from which segments are sent out
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in FIFO order to all interested neighbors.
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"""
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while self.sendQueue:
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(rID, cID) = self.sendQueue[0]
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if rID in self.rowIDs:
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for _, neigh in shuffledDict(self.rowNeighbors[rID], self.shuffleNeighbors):
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self.checkSendSegmentToNeigh(rID, cID, neigh)
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if self.statsTxInSlot >= self.bwUplink:
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return
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if cID in self.columnIDs:
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for _, neigh in shuffledDict(self.columnNeighbors[cID], self.shuffleNeighbors):
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self.checkSendSegmentToNeigh(rID, cID, neigh)
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if self.statsTxInSlot >= self.bwUplink:
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return
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self.sendQueue.popleft()
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def processPerNeighborSendQueue(self):
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"""Send out segments from per-neighbor queues until bandwidth limit reached.
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Segments are dispatched from per-neighbor transmission queues in a shuffled
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round-robin order, emulating a type of fair queuing. Since neighborhood is
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handled at the topic (column or row) level, fair queuing is also at the level
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of flows per topic and per peer. A per-peer model might be closer to the
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reality of libp2p implementations where topics between two nodes are
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multiplexed over the same transport.
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"""
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progress = True
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while (progress):
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progress = False
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queues = []
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# collect and shuffle
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for rID, neighs in self.rowNeighbors.items():
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for neigh in neighs.values():
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if (neigh.sendQueue):
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queues.append((0, rID, neigh))
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for cID, neighs in self.columnNeighbors.items():
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for neigh in neighs.values():
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if (neigh.sendQueue):
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queues.append((1, cID, neigh))
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for dim, lineID, neigh in shuffled(queues, self.shuffleQueues):
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if dim == 0:
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self.checkSendSegmentToNeigh(lineID, neigh.sendQueue.popleft(), neigh)
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else:
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self.checkSendSegmentToNeigh(neigh.sendQueue.popleft(), lineID, neigh)
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progress = True
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if self.statsTxInSlot >= self.bwUplink:
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return
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def runSegmentShuffleScheduler(self):
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""" Schedule chunks for sending.
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This scheduler check which owned segments needs sending (at least
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one neighbor needing it). Then it sends each segment that's worth sending
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once, in shuffled order. This is repeated until bw limit.
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"""
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def collectSegmentsToSend():
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# yields list of segments to send as (dim, lineID, id)
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segmentsToSend = []
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for rID, neighs in self.rowNeighbors.items():
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line = self.getRow(rID)
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needed = zeros(self.shape.blockSize)
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for neigh in neighs.values():
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sentOrReceived = neigh.received | neigh.sent
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if sentOrReceived.count(1) < self.sendLineUntil:
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needed |= ~sentOrReceived
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needed &= line
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if (needed).any():
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for i in range(len(needed)):
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if needed[i]:
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segmentsToSend.append((0, rID, i))
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for cID, neighs in self.columnNeighbors.items():
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line = self.getColumn(cID)
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needed = zeros(self.shape.blockSize)
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for neigh in neighs.values():
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sentOrReceived = neigh.received | neigh.sent
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if sentOrReceived.count(1) < self.sendLineUntil:
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needed |= ~sentOrReceived
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needed &= line
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if (needed).any():
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for i in range(len(needed)):
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if needed[i]:
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segmentsToSend.append((1, cID, i))
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return segmentsToSend
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def nextSegment():
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while True:
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# send each collected segment once
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if hasattr(self, 'segmentShuffleGen') and self.segmentShuffleGen is not None:
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for dim, lineID, id in self.segmentShuffleGen:
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if dim == 0:
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for _, neigh in shuffledDict(self.rowNeighbors[lineID], self.shuffleNeighbors):
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if self.checkSegmentToNeigh(lineID, id, neigh):
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yield((lineID, id, neigh))
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break
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else:
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for _, neigh in shuffledDict(self.columnNeighbors[lineID], self.shuffleNeighbors):
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if self.checkSegmentToNeigh(id, lineID, neigh):
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yield((id, lineID, neigh))
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break
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# collect segments for next round
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segmentsToSend = collectSegmentsToSend()
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# finish if empty or set up shuffled generator based on collected segments
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if not segmentsToSend:
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break
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else:
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self.segmentShuffleGen = shuffled(segmentsToSend, self.shuffleLines)
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for rid, cid, neigh in nextSegment():
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# segments are checked just before yield, so we can send directly
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self.sendSegmentToNeigh(rid, cid, neigh)
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if self.statsTxInSlot >= self.bwUplink:
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if not self.segmentShuffleSchedulerPersist:
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# remove scheduler state before leaving
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self.segmentShuffleGen = None
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return
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def runDumbRandomScheduler(self, tries = 100):
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"""Random scheduler picking segments at random.
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This scheduler implements a simple random scheduling order picking
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segments at random and peers potentially interested in that segment
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also at random.
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It serves more as a performance baseline than as a realistic model.
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"""
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def nextSegment():
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t = tries
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while t:
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if self.rowIDs:
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rID = random.choice(self.rowIDs)
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cID = random.randrange(0, self.shape.blockSize)
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if self.block.getSegment(rID, cID) :
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neigh = random.choice(list(self.rowNeighbors[rID].values()))
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if self.checkSegmentToNeigh(rID, cID, neigh):
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yield(rID, cID, neigh)
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t = tries
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if self.columnIDs:
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cID = random.choice(self.columnIDs)
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rID = random.randrange(0, self.shape.blockSize)
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if self.block.getSegment(rID, cID) :
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neigh = random.choice(list(self.columnNeighbors[cID].values()))
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if self.checkSegmentToNeigh(rID, cID, neigh):
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yield(rID, cID, neigh)
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t = tries
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t -= 1
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for rid, cid, neigh in nextSegment():
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# segments are checked just before yield, so we can send directly
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self.sendSegmentToNeigh(rid, cid, neigh)
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if self.statsTxInSlot >= self.bwUplink:
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return
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def send(self):
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""" Send as much as we can in the timestep, limited by bwUplink."""
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# process node level send queue
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self.processSendQueue()
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if self.statsTxInSlot >= self.bwUplink:
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return
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# process neighbor level send queues in shuffled breadth-first order
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self.processPerNeighborSendQueue()
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if self.statsTxInSlot >= self.bwUplink:
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return
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# process possible segments to send in shuffled breadth-first order
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if self.segmentShuffleScheduler:
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self.runSegmentShuffleScheduler()
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if self.statsTxInSlot >= self.bwUplink:
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return
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if self.dumbRandomScheduler:
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self.runDumbRandomScheduler()
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if self.statsTxInSlot >= self.bwUplink:
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return
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def logRows(self):
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"""It logs the rows assigned to the validator."""
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if self.logger.isEnabledFor(logging.DEBUG):
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for id in self.rowIDs:
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self.logger.debug("Row %d: %s", id, self.getRow(id), extra=self.format)
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def logColumns(self):
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"""It logs the columns assigned to the validator."""
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if self.logger.isEnabledFor(logging.DEBUG):
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for id in self.columnIDs:
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self.logger.debug("Column %d: %s", id, self.getColumn(id), extra=self.format)
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def restoreRows(self):
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"""It restores the rows assigned to the validator, that can be repaired."""
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if self.repairOnTheFly:
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for id in self.rowIDs:
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self.restoreRow(id)
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def restoreRow(self, id):
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"""Restore a given row if repairable."""
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rep = self.block.repairRow(id)
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if (rep.any()):
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# If operation is based on send queues, segments should
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# be queued after successful repair.
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for i in range(len(rep)):
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if rep[i]:
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self.logger.trace("Rep: %d,%d", id, i, extra=self.format)
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self.addToSendQueue(id, i)
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# self.statsRepairInSlot += rep.count(1)
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def restoreColumns(self):
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"""It restores the columns assigned to the validator, that can be repaired."""
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if self.repairOnTheFly:
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for id in self.columnIDs:
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self.restoreColumn(id)
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def restoreColumn(self, id):
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"""Restore a given column if repairable."""
|
|
rep = self.block.repairColumn(id)
|
|
if (rep.any()):
|
|
# If operation is based on send queues, segments should
|
|
# be queued after successful repair.
|
|
for i in range(len(rep)):
|
|
if rep[i]:
|
|
self.logger.trace("Rep: %d,%d", i, id, extra=self.format)
|
|
self.addToSendQueue(i, id)
|
|
# self.statsRepairInSlot += rep.count(1)
|
|
|
|
def checkStatus(self):
|
|
"""It checks how many expected/arrived samples are for each assigned row/column."""
|
|
|
|
def checkStatus(columnIDs, rowIDs):
|
|
arrived = 0
|
|
expected = 0
|
|
for id in columnIDs:
|
|
line = self.getColumn(id)
|
|
arrived += line.count(1)
|
|
expected += len(line)
|
|
for id in rowIDs:
|
|
line = self.getRow(id)
|
|
arrived += line.count(1)
|
|
expected += len(line)
|
|
return arrived, expected
|
|
|
|
arrived, expected = checkStatus(self.columnIDs, self.rowIDs)
|
|
self.logger.debug("status: %d / %d", arrived, expected, extra=self.format)
|
|
|
|
validated = 0
|
|
for i in range(self.vpn):
|
|
a, e = checkStatus(self.vColumnIDs[i], self.vRowIDs[i])
|
|
if a == e:
|
|
validated+=1
|
|
|
|
return arrived, expected, validated
|