Bob Lantz
ee15ce2243
Although we could use print() from __future__, this messes up scripts which use examples as modules. The simple, if not nicest for 2.7, solution is to use info(), output() and other mininet.log functions. The disadvantage is that we may have to adjust things if we change info() to add automatic newlines, but we can burn that bridge in Mininet 3.x.
59 lines
1.9 KiB
Python
Executable File
59 lines
1.9 KiB
Python
Executable File
#!/usr/bin/python
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"""
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Simple example of setting network and CPU parameters
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NOTE: link params limit BW, add latency, and loss.
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There is a high chance that pings WILL fail and that
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iperf will hang indefinitely if the TCP handshake fails
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to complete.
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"""
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from mininet.topo import Topo
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from mininet.net import Mininet
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from mininet.node import CPULimitedHost
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from mininet.link import TCLink
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from mininet.util import dumpNodeConnections
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from mininet.log import setLogLevel, info
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from sys import argv
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class SingleSwitchTopo(Topo):
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"Single switch connected to n hosts."
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def __init__(self, n=2, lossy=True, **opts):
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Topo.__init__(self, **opts)
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switch = self.addSwitch('s1')
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for h in range(n):
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# Each host gets 50%/n of system CPU
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host = self.addHost('h%s' % (h + 1),
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cpu=.5 / n)
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if lossy:
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# 10 Mbps, 5ms delay, 10% packet loss
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self.addLink(host, switch,
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bw=10, delay='5ms', loss=10, use_htb=True)
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else:
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# 10 Mbps, 5ms delay, no packet loss
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self.addLink(host, switch,
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bw=10, delay='5ms', loss=0, use_htb=True)
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def perfTest( lossy=True ):
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"Create network and run simple performance test"
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topo = SingleSwitchTopo( n=4, lossy=lossy )
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net = Mininet( topo=topo,
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host=CPULimitedHost, link=TCLink,
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autoStaticArp=True )
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net.start()
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info( "Dumping host connections\n" )
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dumpNodeConnections(net.hosts)
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info( "Testing bandwidth between h1 and h4\n" )
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h1, h4 = net.getNodeByName('h1', 'h4')
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net.iperf( ( h1, h4 ), l4Type='UDP' )
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net.stop()
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if __name__ == '__main__':
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setLogLevel( 'info' )
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# Prevent test_simpleperf from failing due to packet loss
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perfTest( lossy=( 'testmode' not in argv ) )
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