lantz
f0c726a42f
This helps with virtualenv although it can open up another security hole if you end up using an unexpected python interpreter. Overall it seems to make sense to err on the side of usability but it's good to be aware of security. However, for the remaining utility scripts that require python 2, we explicitly note this with #!/usr/bin/python2.
62 lines
1.9 KiB
Python
Executable File
62 lines
1.9 KiB
Python
Executable File
#!/usr/bin/env 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 sys import argv
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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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# It would be nice if we didn't have to do this:
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# pylint: disable=arguments-differ
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class SingleSwitchTopo( Topo ):
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"Single switch connected to n hosts."
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def build( self, n=2, lossy=True ):
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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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