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Copy pathsimpleperf.py
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executable file
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#!/usr/bin/env python
"""
Simple example of setting network and CPU parameters
NOTE: link params limit BW, add latency, and loss.
There is a high chance that pings WILL fail and that
iperf will hang indefinitely if the TCP handshake fails
to complete.
"""
from sys import argv
from mininet.topo import Topo
from mininet.net import Mininet
from mininet.node import CPULimitedHost
from mininet.link import TCLink
from mininet.util import dumpNodeConnections
from mininet.log import setLogLevel, info
# It would be nice if we didn't have to do this:
# pylint: disable=arguments-differ
class SingleSwitchTopo( Topo ):
"Single switch connected to n hosts."
def build( self, n=2, lossy=True ):
switch = self.addSwitch('s1')
for h in range(n):
# Each host gets 50%/n of system CPU
host = self.addHost('h%s' % (h + 1),
cpu=.5 / n)
if lossy:
# 10 Mbps, 5ms delay, 10% packet loss
self.addLink(host, switch,
bw=10, delay='5ms', loss=10, use_htb=True)
else:
# 10 Mbps, 5ms delay, no packet loss
self.addLink(host, switch,
bw=10, delay='5ms', loss=0, use_htb=True)
def perfTest( lossy=True ):
"Create network and run simple performance test"
topo = SingleSwitchTopo( n=4, lossy=lossy )
net = Mininet( topo=topo,
host=CPULimitedHost, link=TCLink,
autoStaticArp=True )
net.start()
info( "Dumping host connections\n" )
dumpNodeConnections(net.hosts)
info( "Testing bandwidth between h1 and h4\n" )
h1, h4 = net.getNodeByName('h1', 'h4')
net.iperf( ( h1, h4 ), l4Type='UDP' )
net.stop()
if __name__ == '__main__':
setLogLevel( 'info' )
# Prevent test_simpleperf from failing due to packet loss
perfTest( lossy=( 'testmode' not in argv ) )