mirror of
https://github.com/tahoe-lafs/tahoe-lafs.git
synced 2024-12-30 01:38:55 +00:00
288 lines
9.0 KiB
Python
288 lines
9.0 KiB
Python
#! /usr/bin/env python
|
|
|
|
from __future__ import print_function
|
|
|
|
import hashlib
|
|
import os, random
|
|
|
|
from pkg_resources import require
|
|
require('PyRRD')
|
|
from pyrrd import graph
|
|
from pyrrd.rrd import DataSource, RRD, RRA
|
|
|
|
|
|
def sha(s):
|
|
return hashlib.sha1(s).digest()
|
|
|
|
def randomid():
|
|
return os.urandom(20)
|
|
|
|
class Node:
|
|
def __init__(self, nid, introducer, simulator):
|
|
self.nid = nid
|
|
self.introducer = introducer
|
|
self.simulator = simulator
|
|
self.shares = {}
|
|
self.capacity = random.randrange(1000)
|
|
self.utilization = 0
|
|
self.files = []
|
|
|
|
def permute_peers(self, fileid):
|
|
permuted = [(sha(fileid+n.nid),n)
|
|
for n in self.introducer.get_all_nodes()]
|
|
permuted.sort()
|
|
return permuted
|
|
|
|
def publish_file(self, fileid, size, numshares=100):
|
|
sharesize = 4 * size / numshares
|
|
permuted = self.permute_peers(fileid)
|
|
last_givento = None
|
|
tried = 0
|
|
givento = []
|
|
while numshares and permuted:
|
|
pid,node = permuted.pop(0)
|
|
tried += 1
|
|
last_givento = pid
|
|
if node.accept_share(fileid, sharesize):
|
|
givento.append((pid,node))
|
|
numshares -= 1
|
|
if numshares:
|
|
# couldn't push, should delete
|
|
for pid,node in givento:
|
|
node.delete_share(fileid)
|
|
return False
|
|
self.files.append((fileid, numshares))
|
|
self.introducer.please_preserve(fileid, size, tried, last_givento)
|
|
return (True, tried)
|
|
|
|
def accept_share(self, fileid, sharesize):
|
|
if self.utilization < self.capacity:
|
|
# we have room! yay!
|
|
self.shares[fileid] = sharesize
|
|
self.utilization += sharesize
|
|
return True
|
|
if self.decide(sharesize):
|
|
# we don't, but we'll make room
|
|
self.make_space(sharesize)
|
|
self.shares[fileid] = sharesize
|
|
self.utilization += sharesize
|
|
return True
|
|
else:
|
|
# we're full, try elsewhere
|
|
return False
|
|
|
|
def decide(self, sharesize):
|
|
return False
|
|
|
|
def make_space(self, sharesize):
|
|
assert sharesize <= self.capacity
|
|
while self.capacity - self.utilization < sharesize:
|
|
victim = random.choice(self.shares.keys())
|
|
self.simulator.lost_data(self.shares[victim])
|
|
self.delete_share(victim)
|
|
|
|
def delete_share(self, fileid):
|
|
if fileid in self.shares:
|
|
self.utilization -= self.shares[fileid]
|
|
del self.shares[fileid]
|
|
return True
|
|
return False
|
|
|
|
def retrieve_file(self):
|
|
if not self.files:
|
|
return
|
|
fileid,numshares = random.choice(self.files)
|
|
needed = numshares / 4
|
|
peers = []
|
|
for pid,node in self.permute_peers(fileid):
|
|
if random.random() > self.simulator.P_NODEAVAIL:
|
|
continue # node isn't available right now
|
|
if node.has_share(fileid):
|
|
peers.append(node)
|
|
if len(peers) >= needed:
|
|
return True
|
|
return False
|
|
|
|
def delete_file(self):
|
|
if not self.files:
|
|
return False
|
|
which = random.choice(self.files)
|
|
self.files.remove(which)
|
|
fileid,numshares = which
|
|
self.introducer.delete(fileid)
|
|
return True
|
|
|
|
class Introducer:
|
|
def __init__(self, simulator):
|
|
self.living_files = {}
|
|
self.utilization = 0 # total size of all active files
|
|
self.simulator = simulator
|
|
self.simulator.stamp_utilization(self.utilization)
|
|
|
|
def get_all_nodes(self):
|
|
return self.all_nodes
|
|
|
|
def please_preserve(self, fileid, size, tried, last_givento):
|
|
self.living_files[fileid] = (size, tried, last_givento)
|
|
self.utilization += size
|
|
self.simulator.stamp_utilization(self.utilization)
|
|
|
|
def please_delete(self, fileid):
|
|
self.delete(fileid)
|
|
|
|
def permute_peers(self, fileid):
|
|
permuted = [(sha(fileid+n.nid),n)
|
|
for n in self.get_all_nodes()]
|
|
permuted.sort()
|
|
return permuted
|
|
|
|
def delete(self, fileid):
|
|
permuted = self.permute_peers(fileid)
|
|
size, tried, last_givento = self.living_files[fileid]
|
|
pid = ""
|
|
while tried and pid < last_givento:
|
|
pid,node = permuted.pop(0)
|
|
had_it = node.delete_share(fileid)
|
|
if had_it:
|
|
tried -= 1
|
|
self.utilization -= size
|
|
self.simulator.stamp_utilization(self.utilization)
|
|
del self.living_files[fileid]
|
|
|
|
class Simulator:
|
|
NUM_NODES = 1000
|
|
EVENTS = ["ADDFILE", "DELFILE", "ADDNODE", "DELNODE"]
|
|
RATE_ADDFILE = 1.0 / 10
|
|
RATE_DELFILE = 1.0 / 20
|
|
RATE_ADDNODE = 1.0 / 3000
|
|
RATE_DELNODE = 1.0 / 4000
|
|
P_NODEAVAIL = 1.0
|
|
|
|
def __init__(self):
|
|
self.time = 1164783600 # small numbers of seconds since the epoch confuse rrdtool
|
|
self.prevstamptime = int(self.time)
|
|
|
|
ds = DataSource(ds_name='utilizationds', ds_type='GAUGE', heartbeat=1)
|
|
rra = RRA(cf='AVERAGE', xff=0.1, steps=1, rows=1200)
|
|
self.rrd = RRD("/tmp/utilization.rrd", ds=[ds], rra=[rra], start=self.time)
|
|
self.rrd.create()
|
|
|
|
self.introducer = q = Introducer(self)
|
|
self.all_nodes = [Node(randomid(), q, self)
|
|
for i in range(self.NUM_NODES)]
|
|
q.all_nodes = self.all_nodes
|
|
self.next = []
|
|
self.schedule_events()
|
|
self.verbose = False
|
|
|
|
self.added_files = 0
|
|
self.added_data = 0
|
|
self.deleted_files = 0
|
|
self.published_files = []
|
|
self.failed_files = 0
|
|
self.lost_data_bytes = 0 # bytes deleted to make room for new shares
|
|
|
|
def stamp_utilization(self, utilization):
|
|
if int(self.time) > (self.prevstamptime+1):
|
|
self.rrd.bufferValue(self.time, utilization)
|
|
self.prevstamptime = int(self.time)
|
|
|
|
def write_graph(self):
|
|
self.rrd.update()
|
|
self.rrd = None
|
|
import gc
|
|
gc.collect()
|
|
|
|
def1 = graph.DataDefinition(vname="a", rrdfile='/tmp/utilization.rrd', ds_name='utilizationds')
|
|
area1 = graph.Area(value="a", color="#990033", legend='utilizationlegend')
|
|
g = graph.Graph('/tmp/utilization.png', imgformat='PNG', width=540, height=100, vertical_label='utilizationverticallabel', title='utilizationtitle', lower_limit=0)
|
|
g.data.append(def1)
|
|
g.data.append(area1)
|
|
g.write()
|
|
|
|
def add_file(self):
|
|
size = random.randrange(1000)
|
|
n = random.choice(self.all_nodes)
|
|
if self.verbose:
|
|
print("add_file(size=%d, from node %s)" % (size, n))
|
|
fileid = randomid()
|
|
able = n.publish_file(fileid, size)
|
|
if able:
|
|
able, tried = able
|
|
self.added_files += 1
|
|
self.added_data += size
|
|
self.published_files.append(tried)
|
|
else:
|
|
self.failed_files += 1
|
|
|
|
def lost_data(self, size):
|
|
self.lost_data_bytes += size
|
|
|
|
def delete_file(self):
|
|
all_nodes = self.all_nodes[:]
|
|
random.shuffle(all_nodes)
|
|
for n in all_nodes:
|
|
if n.delete_file():
|
|
self.deleted_files += 1
|
|
return
|
|
print("no files to delete")
|
|
|
|
def _add_event(self, etype):
|
|
rate = getattr(self, "RATE_" + etype)
|
|
next = self.time + random.expovariate(rate)
|
|
self.next.append((next, etype))
|
|
self.next.sort()
|
|
|
|
def schedule_events(self):
|
|
types = set([e[1] for e in self.next])
|
|
for etype in self.EVENTS:
|
|
if not etype in types:
|
|
self._add_event(etype)
|
|
|
|
def do_event(self):
|
|
time, etype = self.next.pop(0)
|
|
assert time > self.time
|
|
# current_time = self.time
|
|
self.time = time
|
|
self._add_event(etype)
|
|
if etype == "ADDFILE":
|
|
self.add_file()
|
|
elif etype == "DELFILE":
|
|
self.delete_file()
|
|
elif etype == "ADDNODE":
|
|
pass
|
|
#self.add_node()
|
|
elif etype == "DELNODE":
|
|
#self.del_node()
|
|
pass
|
|
# self.print_stats(current_time, etype)
|
|
|
|
def print_stats_header(self):
|
|
print("time: added failed lost avg_tried")
|
|
|
|
def print_stats(self, time, etype):
|
|
if not self.published_files:
|
|
avg_tried = "NONE"
|
|
else:
|
|
avg_tried = sum(self.published_files) / len(self.published_files)
|
|
print(time, etype, self.added_data, self.failed_files, self.lost_data_bytes, avg_tried, len(self.introducer.living_files), self.introducer.utilization)
|
|
|
|
s = None
|
|
|
|
def main():
|
|
# rrdtool.create("foo.rrd",
|
|
# "--step 10",
|
|
# "DS:files-added:DERIVE::0:1000",
|
|
# "RRA:AVERAGE:1:1:1200",
|
|
# )
|
|
global s
|
|
s = Simulator()
|
|
# s.print_stats_header()
|
|
for i in range(1000):
|
|
s.do_event()
|
|
print("%d files added, %d files deleted" % (s.added_files, s.deleted_files))
|
|
return s
|
|
|
|
if __name__ == '__main__':
|
|
main()
|