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yggdrasil-go/misc/sim/treesim-forward.py
Dimitris Apostolou 73f50af3b7
Fix typos
2019-11-29 11:45:02 +02:00

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# Tree routing scheme (named Yggdrasil, after the world tree from Norse mythology)
# Steps:
# 1: Pick any node, here I'm using highest nodeID
# 2: Build spanning tree, each node stores path back to root
# Optionally with weights for each hop
# Ties broken by preferring a parent with higher degree
# 3: Distance metric: self->peer + (via tree) peer->dest
# 4: Perform (modified) greedy lookup via this metric for each direction (A->B and B->A)
# 5: Source-route traffic using the better of those two paths
# Note: This makes no attempt to simulate a dynamic network
# E.g. A node's peers cannot be disconnected
# TODO:
# Make better use of drop?
# In particular, we should be ignoring *all* recently dropped *paths* to the root
# To minimize route flapping
# Not really an issue in the sim, but probably needed for a real network
import array
import gc
import glob
import gzip
import heapq
import os
import random
import time
#############
# Constants #
#############
# Reminder of where link cost comes in
LINK_COST = 1
# Timeout before dropping something, in simulated seconds
TIMEOUT = 60
###########
# Classes #
###########
class PathInfo:
def __init__(self, nodeID):
self.nodeID = nodeID # e.g. IP
self.coords = [] # Position in tree
self.tstamp = 0 # Timestamp from sender, to keep track of old vs new info
self.degree = 0 # Number of peers the sender has, used to break ties
# The above should be signed
self.path = [nodeID] # Path to node (in path-vector route)
self.time = 0 # Time info was updated, to keep track of e.g. timeouts
self.treeID = nodeID # Hack, let tree use different ID than IP, used so we can dijkstra once and test many roots
def clone(self):
# Return a deep-enough copy of the path
clone = PathInfo(None)
clone.nodeID = self.nodeID
clone.coords = self.coords[:]
clone.tstamp = self.tstamp
clone.degree = self.degree
clone.path = self.path[:]
clone.time = self.time
clone.treeID = self.treeID
return clone
# End class PathInfo
class Node:
def __init__(self, nodeID):
self.info = PathInfo(nodeID) # Self NodeInfo
self.root = None # PathInfo to node at root of tree
self.drop = dict() # PathInfo to nodes from clus that have timed out
self.peers = dict() # PathInfo to peers
self.links = dict() # Links to peers (to pass messages)
self.msgs = [] # Said messages
self.table = dict() # Pre-computed lookup table of peer info
def tick(self):
# Do periodic maintenance stuff, including push updates
self.info.time += 1
if self.info.time > self.info.tstamp + TIMEOUT/4:
# Update timestamp at least once every 1/4 timeout period
# This should probably be randomized in a real implementation
self.info.tstamp = self.info.time
self.info.degree = 0# TODO decide if degree should be used, len(self.peers)
changed = False # Used to track when the network has converged
changed |= self.cleanRoot()
self.cleanDropped()
# Should probably send messages infrequently if there's nothing new to report
if self.info.tstamp == self.info.time:
msg = self.createMessage()
self.sendMessage(msg)
return changed
def cleanRoot(self):
changed = False
if self.root and self.info.time - self.root.time > TIMEOUT:
print "DEBUG: clean root,", self.root.path
self.drop[self.root.treeID] = self.root
self.root = None
changed = True
if not self.root or self.root.treeID < self.info.treeID:
# No need to drop someone who'se worse than us
self.info.coords = [self.info.nodeID]
self.root = self.info.clone()
changed = True
elif self.root.treeID == self.info.treeID:
self.root = self.info.clone()
return changed
def cleanDropped(self):
# May actually be a treeID... better to iterate over keys explicitly
nodeIDs = sorted(self.drop.keys())
for nodeID in nodeIDs:
node = self.drop[nodeID]
if self.info.time - node.time > 4*TIMEOUT:
del self.drop[nodeID]
return None
def createMessage(self):
# Message is just a tuple
# First element is the sender
# Second element is the root
# We will .clone() everything during the send operation
msg = (self.info, self.root)
return msg
def sendMessage(self, msg):
for link in self.links.values():
newMsg = (msg[0].clone(), msg[1].clone())
link.msgs.append(newMsg)
return None
def handleMessages(self):
changed = False
while self.msgs:
changed |= self.handleMessage(self.msgs.pop())
return changed
def handleMessage(self, msg):
changed = False
for node in msg:
# Update the path and timestamp for the sender and root info
node.path.append(self.info.nodeID)
node.time = self.info.time
# Update the sender's info in our list of peers
sender = msg[0]
self.peers[sender.nodeID] = sender
# Decide if we want to update the root
root = msg[1]
updateRoot = False
isSameParent = False
isBetterParent = False
if len(self.root.path) > 1 and len(root.path) > 1:
parent = self.peers[self.root.path[-2]]
if parent.nodeID == sender.nodeID: isSameParent = True
if sender.degree > parent.degree:
# This would also be where you check path uptime/reliability/whatever
# All else being equal, we prefer parents with high degree
# We are trusting peers to report degree correctly in this case
# So expect some performance reduction if your peers aren't trustworthy
# (Lies can increase average stretch by a few %)
isBetterParent = True
if self.info.nodeID in root.path[:-1]: pass # No loopy routes allowed
elif root.treeID in self.drop and self.drop[root.treeID].tstamp >= root.tstamp: pass
elif not self.root: updateRoot = True
elif self.root.treeID < root.treeID: updateRoot = True
elif self.root.treeID != root.treeID: pass
elif self.root.tstamp > root.tstamp: pass
elif len(root.path) < len(self.root.path): updateRoot = True
elif isBetterParent and len(root.path) == len(self.root.path): updateRoot = True
elif isSameParent and self.root.tstamp < root.tstamp: updateRoot = True
if updateRoot:
if not self.root or self.root.path != root.path: changed = True
self.root = root
self.info.coords = self.root.path
return changed
def lookup(self, dest):
# Note: Can loop in an unconverged network
# The person looking up the route is responsible for checking for loops
best = None
bestDist = 0
for node in self.peers.itervalues():
# dist = distance to node + dist (on tree) from node to dest
dist = len(node.path)-1 + treeDist(node.coords, dest.coords)
if not best or dist < bestDist:
best = node
bestDist = dist
if best:
next = best.path[-2]
assert next in self.peers
return next
else:
# We failed to look something up
# TODO some way to signal this which doesn't crash
assert False
def initTable(self):
# Pre-computes a lookup table for destination coords
# Insert parent first so you prefer them as a next-hop
self.table.clear()
parent = self.info.nodeID
if len(self.info.coords) >= 2: parent = self.info.coords[-2]
for peer in self.peers.itervalues():
current = self.table
for coord in peer.coords:
if coord not in current: current[coord] = (peer.nodeID, dict())
old = current[coord]
next = old[1]
oldPeer = self.peers[old[0]]
oldDist = len(oldPeer.coords)
oldDeg = oldPeer.degree
newDist = len(peer.coords)
newDeg = peer.degree
# Prefer parent
# Else prefer short distance from root
# If equal distance, prefer high degree
if peer.nodeID == parent: current[coord] = (peer.nodeID, next)
elif newDist < oldDist: current[coord] = (peer.nodeID, next)
elif newDist == oldDist and newDeg > oldDeg: current[coord] = (peer.nodeID, next)
current = next
return None
def lookup_new(self, dest):
# Use pre-computed lookup table to look up next hop for dest coords
assert self.table
if len(self.info.coords) >= 2: parent = self.info.coords[-2]
else: parent = None
current = (parent, self.table)
c = None
for coord in dest.coords:
c = coord
if coord not in current[1]: break
current = current[1][coord]
next = current[0]
if c in self.peers: next = c
if next not in self.peers:
assert next == None
# You're the root of a different connected component
# You'd drop the packet in this case
# To make the path cache not die, need to return a valid next hop...
# Returning self for that reason
next = self.info.nodeID
return next
# End class Node
####################
# Helper Functions #
####################
def getIndexOfLCA(source, dest):
# Return index of last common ancestor in source/dest coords
# -1 if no common ancestor (e.g. different roots)
lcaIdx = -1
minLen = min(len(source), len(dest))
for idx in xrange(minLen):
if source[idx] == dest[idx]: lcaIdx = idx
else: break
return lcaIdx
def treePath(source, dest):
# Return path with source at head and dest at tail
lastMatch = getIndexOfLCA(source, dest)
path = dest[-1:lastMatch:-1] + source[lastMatch:]
assert path[0] == dest[-1]
assert path[-1] == source[-1]
return path
def treeDist(source, dest):
dist = len(source) + len(dest)
lcaIdx = getIndexOfLCA(source, dest)
dist -= 2*(lcaIdx+1)
return dist
def dijkstra(nodestore, startingNodeID):
# Idea to use heapq and basic implementation taken from stackexchange post
# http://codereview.stackexchange.com/questions/79025/dijkstras-algorithm-in-python
nodeIDs = sorted(nodestore.keys())
nNodes = len(nodeIDs)
idxs = dict()
for nodeIdx in xrange(nNodes):
nodeID = nodeIDs[nodeIdx]
idxs[nodeID] = nodeIdx
dists = array.array("H", [0]*nNodes)
queue = [(0, startingNodeID)]
while queue:
dist, nodeID = heapq.heappop(queue)
idx = idxs[nodeID]
if not dists[idx]: # Unvisited, otherwise we skip it
dists[idx] = dist
for peer in nodestore[nodeID].links:
if not dists[idxs[peer]]:
# Peer is also unvisited, so add to queue
heapq.heappush(queue, (dist+LINK_COST, peer))
return dists
def dijkstrall(nodestore):
# Idea to use heapq and basic implementation taken from stackexchange post
# http://codereview.stackexchange.com/questions/79025/dijkstras-algorithm-in-python
nodeIDs = sorted(nodestore.keys())
nNodes = len(nodeIDs)
idxs = dict()
for nodeIdx in xrange(nNodes):
nodeID = nodeIDs[nodeIdx]
idxs[nodeID] = nodeIdx
dists = array.array("H", [0]*nNodes*nNodes) # use GetCacheIndex(nNodes, start, end)
for sourceIdx in xrange(nNodes):
print "Finding shortest paths for node {} / {} ({})".format(sourceIdx+1, nNodes, nodeIDs[sourceIdx])
queue = [(0, sourceIdx)]
while queue:
dist, nodeIdx = heapq.heappop(queue)
distIdx = getCacheIndex(nNodes, sourceIdx, nodeIdx)
if not dists[distIdx]: # Unvisited, otherwise we skip it
dists[distIdx] = dist
for peer in nodestore[nodeIDs[nodeIdx]].links:
pIdx = idxs[peer]
pdIdx = getCacheIndex(nNodes, sourceIdx, pIdx)
if not dists[pdIdx]:
# Peer is also unvisited, so add to queue
heapq.heappush(queue, (dist+LINK_COST, pIdx))
return dists
def linkNodes(node1, node2):
node1.links[node2.info.nodeID] = node2
node2.links[node1.info.nodeID] = node1
############################
# Store topology functions #
############################
def makeStoreSquareGrid(sideLength, randomize=True):
# Simple grid in a sideLength*sideLength square
# Just used to validate that the code runs
store = dict()
nodeIDs = list(range(sideLength*sideLength))
if randomize: random.shuffle(nodeIDs)
for nodeID in nodeIDs:
store[nodeID] = Node(nodeID)
for index in xrange(len(nodeIDs)):
if (index % sideLength != 0): linkNodes(store[nodeIDs[index]], store[nodeIDs[index-1]])
if (index >= sideLength): linkNodes(store[nodeIDs[index]], store[nodeIDs[index-sideLength]])
print "Grid store created, size {}".format(len(store))
return store
def makeStoreASRelGraph(pathToGraph):
#Existing network graphs, in caida.org's asrel format (ASx|ASy|z per line, z denotes relationship type)
with open(pathToGraph, "r") as f:
inData = f.readlines()
store = dict()
for line in inData:
if line.strip()[0] == "#": continue # Skip comment lines
line = line.replace('|'," ")
nodes = map(int, line.split()[0:2])
if nodes[0] not in store: store[nodes[0]] = Node(nodes[0])
if nodes[1] not in store: store[nodes[1]] = Node(nodes[1])
linkNodes(store[nodes[0]], store[nodes[1]])
print "CAIDA AS-relation graph successfully imported, size {}".format(len(store))
return store
def makeStoreASRelGraphMaxDeg(pathToGraph, degIdx=0):
with open(pathToGraph, "r") as f:
inData = f.readlines()
store = dict()
nodeDeg = dict()
for line in inData:
if line.strip()[0] == "#": continue # Skip comment lines
line = line.replace('|'," ")
nodes = map(int, line.split()[0:2])
if nodes[0] not in nodeDeg: nodeDeg[nodes[0]] = 0
if nodes[1] not in nodeDeg: nodeDeg[nodes[1]] = 0
nodeDeg[nodes[0]] += 1
nodeDeg[nodes[1]] += 1
sortedNodes = sorted(nodeDeg.keys(), \
key=lambda x: (nodeDeg[x], x), \
reverse=True)
maxDegNodeID = sortedNodes[degIdx]
return makeStoreASRelGraphFixedRoot(pathToGraph, maxDegNodeID)
def makeStoreASRelGraphFixedRoot(pathToGraph, rootNodeID):
with open(pathToGraph, "r") as f:
inData = f.readlines()
store = dict()
for line in inData:
if line.strip()[0] == "#": continue # Skip comment lines
line = line.replace('|'," ")
nodes = map(int, line.split()[0:2])
if nodes[0] not in store:
store[nodes[0]] = Node(nodes[0])
if nodes[0] == rootNodeID: store[nodes[0]].info.treeID += 1000000000
if nodes[1] not in store:
store[nodes[1]] = Node(nodes[1])
if nodes[1] == rootNodeID: store[nodes[1]].info.treeID += 1000000000
linkNodes(store[nodes[0]], store[nodes[1]])
print "CAIDA AS-relation graph successfully imported, size {}".format(len(store))
return store
def makeStoreDimesEdges(pathToGraph, rootNodeID=None):
# Read from a DIMES csv-formatted graph from a gzip file
store = dict()
with gzip.open(pathToGraph, "r") as f:
inData = f.readlines()
size = len(inData)
index = 0
for edge in inData:
if not index % 1000:
pct = 100.0*index/size
print "Processing edge {}, {:.2f}%".format(index, pct)
index += 1
dat = edge.rstrip().split(',')
node1 = "N" + str(dat[0].strip())
node2 = "N" + str(dat[1].strip())
if '?' in node1 or '?' in node2: continue #Unknown node
if node1 == rootNodeID: node1 = "R" + str(dat[0].strip())
if node2 == rootNodeID: node2 = "R" + str(dat[1].strip())
if node1 not in store: store[node1] = Node(node1)
if node2 not in store: store[node2] = Node(node2)
if node1 != node2: linkNodes(store[node1], store[node2])
print "DIMES graph successfully imported, size {}".format(len(store))
return store
def makeStoreGeneratedGraph(pathToGraph, root=None):
with open(pathToGraph, "r") as f:
inData = f.readlines()
store = dict()
for line in inData:
if line.strip()[0] == "#": continue # Skip comment lines
nodes = map(int, line.strip().split(' ')[0:2])
node1 = nodes[0]
node2 = nodes[1]
if node1 == root: node1 += 1000000
if node2 == root: node2 += 1000000
if node1 not in store: store[node1] = Node(node1)
if node2 not in store: store[node2] = Node(node2)
linkNodes(store[node1], store[node2])
print "Generated graph successfully imported, size {}".format(len(store))
return store
############################################
# Functions used as parts of network tests #
############################################
def idleUntilConverged(store):
nodeIDs = sorted(store.keys())
timeOfLastChange = 0
step = 0
# Idle until the network has converged
while step - timeOfLastChange < 4*TIMEOUT:
step += 1
print "Step: {}, last change: {}".format(step, timeOfLastChange)
changed = False
for nodeID in nodeIDs:
# Update node status, send messages
changed |= store[nodeID].tick()
for nodeID in nodeIDs:
# Process messages
changed |= store[nodeID].handleMessages()
if changed: timeOfLastChange = step
initTables(store)
return store
def getCacheIndex(nodes, sourceIndex, destIndex):
return sourceIndex*nodes + destIndex
def initTables(store):
nodeIDs = sorted(store.keys())
nNodes = len(nodeIDs)
print "Initializing routing tables for {} nodes".format(nNodes)
for idx in xrange(nNodes):
nodeID = nodeIDs[idx]
store[nodeID].initTable()
print "Routing tables initialized"
return None
def getCache(store):
nodeIDs = sorted(store.keys())
nNodes = len(nodeIDs)
nodeIdxs = dict()
for nodeIdx in xrange(nNodes):
nodeIdxs[nodeIDs[nodeIdx]] = nodeIdx
cache = array.array("H", [0]*nNodes*nNodes)
for sourceIdx in xrange(nNodes):
sourceID = nodeIDs[sourceIdx]
print "Building fast lookup table for node {} / {} ({})".format(sourceIdx+1, nNodes, sourceID)
for destIdx in xrange(nNodes):
destID = nodeIDs[destIdx]
if sourceID == destID: nextHop = destID # lookup would fail
else: nextHop = store[sourceID].lookup(store[destID].info)
nextHopIdx = nodeIdxs[nextHop]
cache[getCacheIndex(nNodes, sourceIdx, destIdx)] = nextHopIdx
return cache
def testPaths(store, dists):
cache = getCache(store)
nodeIDs = sorted(store.keys())
nNodes = len(nodeIDs)
idxs = dict()
for nodeIdx in xrange(nNodes):
nodeID = nodeIDs[nodeIdx]
idxs[nodeID] = nodeIdx
results = dict()
for sourceIdx in xrange(nNodes):
sourceID = nodeIDs[sourceIdx]
print "Testing paths from node {} / {} ({})".format(sourceIdx+1, len(nodeIDs), sourceID)
#dists = dijkstra(store, sourceID)
for destIdx in xrange(nNodes):
destID = nodeIDs[destIdx]
if destID == sourceID: continue # Skip self
distIdx = getCacheIndex(nNodes, sourceIdx, destIdx)
eHops = dists[distIdx]
if not eHops: continue # The network is split, no path exists
hops = 0
for pair in ((sourceIdx, destIdx),):
nHops = 0
locIdx = pair[0]
dIdx = pair[1]
while locIdx != dIdx:
locIdx = cache[getCacheIndex(nNodes, locIdx, dIdx)]
nHops += 1
if not hops or nHops < hops: hops = nHops
if eHops not in results: results[eHops] = dict()
if hops not in results[eHops]: results[eHops][hops] = 0
results[eHops][hops] += 1
return results
def getAvgStretch(pathMatrix):
avgStretch = 0.
checked = 0.
for eHops in sorted(pathMatrix.keys()):
for nHops in sorted(pathMatrix[eHops].keys()):
count = pathMatrix[eHops][nHops]
stretch = float(nHops)/float(max(1, eHops))
avgStretch += stretch*count
checked += count
avgStretch /= max(1, checked)
return avgStretch
def getMaxStretch(pathMatrix):
maxStretch = 0.
for eHops in sorted(pathMatrix.keys()):
for nHops in sorted(pathMatrix[eHops].keys()):
stretch = float(nHops)/float(max(1, eHops))
maxStretch = max(maxStretch, stretch)
return maxStretch
def getCertSizes(store):
# Returns nCerts frequency distribution
# De-duplicates common certs (for shared prefixes in the path)
sizes = dict()
for node in store.values():
certs = set()
for peer in node.peers.values():
pCerts = set()
assert len(peer.path) == 2
assert peer.coords[-1] == peer.path[0]
hops = peer.coords + peer.path[1:]
for hopIdx in xrange(len(hops)-1):
send = hops[hopIdx]
if send == node.info.nodeID: continue # We created it, already have it
path = hops[0:hopIdx+2]
# Each cert is signed by the sender
# Includes information about the path from the sender to the next hop
# Next hop is at hopIdx+1, so the path to next hop is hops[0:hopIdx+2]
cert = "{}:{}".format(send, path)
certs.add(cert)
size = len(certs)
if size not in sizes: sizes[size] = 0
sizes[size] += 1
return sizes
def getMinLinkCertSizes(store):
# Returns nCerts frequency distribution
# De-duplicates common certs (for shared prefixes in the path)
# Based on the minimum number of certs that must be traded through a particular link
# Handled per link
sizes = dict()
for node in store.values():
peerCerts = dict()
for peer in node.peers.values():
pCerts = set()
assert len(peer.path) == 2
assert peer.coords[-1] == peer.path[0]
hops = peer.coords + peer.path[1:]
for hopIdx in xrange(len(hops)-1):
send = hops[hopIdx]
if send == node.info.nodeID: continue # We created it, already have it
path = hops[0:hopIdx+2]
# Each cert is signed by the sender
# Includes information about the path from the sender to the next hop
# Next hop is at hopIdx+1, so the path to next hop is hops[0:hopIdx+2]
cert = "{}:{}".format(send, path)
pCerts.add(cert)
peerCerts[peer.nodeID] = pCerts
for peer in peerCerts:
size = 0
pCerts = peerCerts[peer]
for cert in pCerts:
required = True
for p2 in peerCerts:
if p2 == peer: continue
p2Certs = peerCerts[p2]
if cert in p2Certs: required = False
if required: size += 1
if size not in sizes: sizes[size] = 0
sizes[size] += 1
return sizes
def getPathSizes(store):
# Returns frequency distribution of the total number of hops the routing table
# I.e. a node with 3 peers, each with 5 hop coord+path, would count as 3x5=15
sizes = dict()
for node in store.values():
size = 0
for peer in node.peers.values():
assert len(peer.path) == 2
assert peer.coords[-1] == peer.path[0]
peerSize = len(peer.coords) + len(peer.path) - 1 # double-counts peer, -1
size += peerSize
if size not in sizes: sizes[size] = 0
sizes[size] += 1
return sizes
def getPeerSizes(store):
# Returns frequency distribution of the number of peers each node has
sizes = dict()
for node in store.values():
nPeers = len(node.peers)
if nPeers not in sizes: sizes[nPeers] = 0
sizes[nPeers] += 1
return sizes
def getAvgSize(sizes):
sumSizes = 0
nNodes = 0
for size in sizes:
count = sizes[size]
sumSizes += size*count
nNodes += count
avgSize = float(sumSizes)/max(1, nNodes)
return avgSize
def getMaxSize(sizes):
return max(sizes.keys())
def getMinSize(sizes):
return min(sizes.keys())
def getResults(pathMatrix):
results = []
for eHops in sorted(pathMatrix.keys()):
for nHops in sorted(pathMatrix[eHops].keys()):
count = pathMatrix[eHops][nHops]
results.append("{} {} {}".format(eHops, nHops, count))
return '\n'.join(results)
####################################
# Functions to run different tests #
####################################
def runTest(store):
# Runs the usual set of tests on the store
# Does not save results, so only meant for quick tests
# To e.g. check the code works, maybe warm up the pypy jit
for node in store.values():
node.info.time = random.randint(0, TIMEOUT)
node.info.tstamp = TIMEOUT
print "Begin testing network"
dists = None
if not dists: dists = dijkstrall(store)
idleUntilConverged(store)
pathMatrix = testPaths(store, dists)
avgStretch = getAvgStretch(pathMatrix)
maxStretch = getMaxStretch(pathMatrix)
peers = getPeerSizes(store)
certs = getCertSizes(store)
paths = getPathSizes(store)
linkCerts = getMinLinkCertSizes(store)
avgPeerSize = getAvgSize(peers)
maxPeerSize = getMaxSize(peers)
avgCertSize = getAvgSize(certs)
maxCertSize = getMaxSize(certs)
avgPathSize = getAvgSize(paths)
maxPathSize = getMaxSize(paths)
avgLinkCert = getAvgSize(linkCerts)
maxLinkCert = getMaxSize(linkCerts)
totalCerts = sum(map(lambda x: x*certs[x], certs.keys()))
totalLinks = sum(map(lambda x: x*peers[x], peers.keys())) # one-way links
avgCertsPerLink = float(totalCerts)/max(1, totalLinks)
print "Finished testing network"
print "Avg / Max stretch: {} / {}".format(avgStretch, maxStretch)
print "Avg / Max nPeers size: {} / {}".format(avgPeerSize, maxPeerSize)
print "Avg / Max nCerts size: {} / {}".format(avgCertSize, maxCertSize)
print "Avg / Max total hops in any node's routing table: {} / {}".format(avgPathSize, maxPathSize)
print "Avg / Max lower bound cert requests per link (one-way): {} / {}".format(avgLinkCert, maxLinkCert)
print "Avg certs per link (one-way): {}".format(avgCertsPerLink)
return # End of function
def rootNodeASTest(path, outDir="output-treesim-AS", dists=None, proc = 1):
# Checks performance for every possible choice of root node
# Saves output for each root node to a separate file on disk
# path = input path to some caida.org formatted AS-relationship graph
if not os.path.exists(outDir): os.makedirs(outDir)
assert os.path.exists(outDir)
store = makeStoreASRelGraph(path)
nodes = sorted(store.keys())
for nodeIdx in xrange(len(nodes)):
if nodeIdx % proc != 0: continue # Work belongs to someone else
rootNodeID = nodes[nodeIdx]
outpath = outDir+"/{}".format(rootNodeID)
if os.path.exists(outpath):
print "Skipping {}, already processed".format(rootNodeID)
continue
store = makeStoreASRelGraphFixedRoot(path, rootNodeID)
for node in store.values():
node.info.time = random.randint(0, TIMEOUT)
node.info.tstamp = TIMEOUT
print "Beginning {}, size {}".format(nodeIdx, len(store))
if not dists: dists = dijkstrall(store)
idleUntilConverged(store)
pathMatrix = testPaths(store, dists)
avgStretch = getAvgStretch(pathMatrix)
maxStretch = getMaxStretch(pathMatrix)
results = getResults(pathMatrix)
with open(outpath, "w") as f:
f.write(results)
print "Finished test for root AS {} ({} / {})".format(rootNodeID, nodeIdx+1, len(store))
print "Avg / Max stretch: {} / {}".format(avgStretch, maxStretch)
#break # Stop after 1, because they can take forever
return # End of function
def timelineASTest():
# Meant to study the performance of the network as a function of network size
# Loops over a set of AS-relationship graphs
# Runs a test on each graph, selecting highest-degree node as the root
# Saves results for each graph to a separate file on disk
outDir = "output-treesim-timeline-AS"
if not os.path.exists(outDir): os.makedirs(outDir)
assert os.path.exists(outDir)
paths = sorted(glob.glob("asrel/datasets/*"))
for path in paths:
date = os.path.basename(path).split(".")[0]
outpath = outDir+"/{}".format(date)
if os.path.exists(outpath):
print "Skipping {}, already processed".format(date)
continue
store = makeStoreASRelGraphMaxDeg(path)
dists = None
for node in store.values():
node.info.time = random.randint(0, TIMEOUT)
node.info.tstamp = TIMEOUT
print "Beginning {}, size {}".format(date, len(store))
if not dists: dists = dijkstrall(store)
idleUntilConverged(store)
pathMatrix = testPaths(store, dists)
avgStretch = getAvgStretch(pathMatrix)
maxStretch = getMaxStretch(pathMatrix)
results = getResults(pathMatrix)
with open(outpath, "w") as f:
f.write(results)
print "Finished {} with {} nodes".format(date, len(store))
print "Avg / Max stretch: {} / {}".format(avgStretch, maxStretch)
#break # Stop after 1, because they can take forever
return # End of function
def timelineDimesTest():
# Meant to study the performance of the network as a function of network size
# Loops over a set of AS-relationship graphs
# Runs a test on each graph, selecting highest-degree node as the root
# Saves results for each graph to a separate file on disk
outDir = "output-treesim-timeline-dimes"
if not os.path.exists(outDir): os.makedirs(outDir)
assert os.path.exists(outDir)
# Input files are named ASEdgesX_Y where X = month (no leading 0), Y = year
paths = sorted(glob.glob("DIMES/ASEdges/*.gz"))
exists = set(glob.glob(outDir+"/*"))
for path in paths:
date = os.path.basename(path).split(".")[0]
outpath = outDir+"/{}".format(date)
if outpath in exists:
print "Skipping {}, already processed".format(date)
continue
store = makeStoreDimesEdges(path)
# Get the highest degree node and make it root
# Sorted by nodeID just to make it stable in the event of a tie
nodeIDs = sorted(store.keys())
bestRoot = ""
bestDeg = 0
for nodeID in nodeIDs:
node = store[nodeID]
if len(node.links) > bestDeg:
bestRoot = nodeID
bestDeg = len(node.links)
assert bestRoot
store = makeStoreDimesEdges(path, bestRoot)
rootID = "R" + bestRoot[1:]
assert rootID in store
# Don't forget to set random seed before setting times
# To make results reproducible
nodeIDs = sorted(store.keys())
random.seed(12345)
for nodeID in nodeIDs:
node = store[nodeID]
node.info.time = random.randint(0, TIMEOUT)
node.info.tstamp = TIMEOUT
print "Beginning {}, size {}".format(date, len(store))
if not dists: dists = dijkstrall(store)
idleUntilConverged(store)
pathMatrix = testPaths(store, dists)
avgStretch = getAvgStretch(pathMatrix)
maxStretch = getMaxStretch(pathMatrix)
results = getResults(pathMatrix)
with open(outpath, "w") as f:
f.write(results)
print "Finished {} with {} nodes".format(date, len(store))
print "Avg / Max stretch: {} / {}".format(avgStretch, maxStretch)
break # Stop after 1, because they can take forever
return # End of function
def scalingTest(maxTests=None, inputDir="graphs"):
# Meant to study the performance of the network as a function of network size
# Loops over a set of nodes in a previously generated graph
# Runs a test on each graph, testing each node as the root
# if maxTests is set, tests only that number of roots (highest degree first)
# Saves results for each graph to a separate file on disk
outDir = "output-treesim-{}".format(inputDir)
if not os.path.exists(outDir): os.makedirs(outDir)
assert os.path.exists(outDir)
paths = sorted(glob.glob("{}/*".format(inputDir)))
exists = set(glob.glob(outDir+"/*"))
for path in paths:
gc.collect() # pypy waits for gc to close files
graph = os.path.basename(path).split(".")[0]
store = makeStoreGeneratedGraph(path)
# Get the highest degree node and make it root
# Sorted by nodeID just to make it stable in the event of a tie
nodeIDs = sorted(store.keys(), key=lambda x: len(store[x].links), reverse=True)
dists = None
if maxTests: nodeIDs = nodeIDs[:maxTests]
for nodeID in nodeIDs:
nodeIDStr = str(nodeID).zfill(len(str(len(store)-1)))
outpath = outDir+"/{}-{}".format(graph, nodeIDStr)
if outpath in exists:
print "Skipping {}-{}, already processed".format(graph, nodeIDStr)
continue
store = makeStoreGeneratedGraph(path, nodeID)
# Don't forget to set random seed before setting times
random.seed(12345) # To make results reproducible
nIDs = sorted(store.keys())
for nID in nIDs:
node = store[nID]
node.info.time = random.randint(0, TIMEOUT)
node.info.tstamp = TIMEOUT
print "Beginning {}, size {}".format(graph, len(store))
if not dists: dists = dijkstrall(store)
idleUntilConverged(store)
pathMatrix = testPaths(store, dists)
avgStretch = getAvgStretch(pathMatrix)
maxStretch = getMaxStretch(pathMatrix)
results = getResults(pathMatrix)
with open(outpath, "w") as f:
f.write(results)
print "Finished {} with {} nodes for root {}".format(graph, len(store), nodeID)
print "Avg / Max stretch: {} / {}".format(avgStretch, maxStretch)
return # End of function
##################
# Main Execution #
##################
if __name__ == "__main__":
if True: # Run a quick test
random.seed(12345) # DEBUG
store = makeStoreSquareGrid(4)
runTest(store) # Quick test
store = None
# Do some real work
#runTest(makeStoreDimesEdges("DIMES/ASEdges/ASEdges1_2007.csv.gz"))
#timelineDimesTest()
#rootNodeASTest("asrel/datasets/19980101.as-rel.txt")
#timelineASTest()
#rootNodeASTest("hype-2016-09-19.list", "output-treesim-hype")
#scalingTest(None, "graphs-20") # First argument 1 to only test 1 root per graph
#store = makeStoreGeneratedGraph("bgp_tables")
#store = makeStoreGeneratedGraph("skitter")
#store = makeStoreASRelGraphMaxDeg("hype-2016-09-19.list") #http://hia.cjdns.ca/watchlist/c/walk.peers.20160919
#store = makeStoreGeneratedGraph("fc00-2017-08-12.txt")
if store: runTest(store)
#rootNodeASTest("skitter", "output-treesim-skitter", None, 0, 1)
#scalingTest(1, "graphs-20") # First argument 1 to only test 1 root per graph
#scalingTest(1, "graphs-21") # First argument 1 to only test 1 root per graph
#scalingTest(1, "graphs-22") # First argument 1 to only test 1 root per graph
#scalingTest(1, "graphs-23") # First argument 1 to only test 1 root per graph
if not store:
import sys
args = sys.argv
if len(args) == 2:
job_number = int(sys.argv[1])
rootNodeASTest("fc00-2017-08-12.txt", "fc00", None, job_number)
else:
print "Usage: {} job_number".format(args[0])
print "job_number = which job set to run on this node (1-indexed)"
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