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.
73 lines
2.1 KiB
Python
Executable File
73 lines
2.1 KiB
Python
Executable File
#!/usr/bin/python
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"""
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cpu.py: test iperf bandwidth for varying cpu limits
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"""
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from mininet.net import Mininet
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from mininet.node import CPULimitedHost
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from mininet.topolib import TreeTopo
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from mininet.util import custom, waitListening
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from mininet.log import setLogLevel, info
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def bwtest( cpuLimits, period_us=100000, seconds=5 ):
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"""Example/test of link and CPU bandwidth limits
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cpu: cpu limit as fraction of overall CPU time"""
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topo = TreeTopo( depth=1, fanout=2 )
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results = {}
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for sched in 'rt', 'cfs':
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info( '*** Testing with', sched, 'bandwidth limiting\n' )
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for cpu in cpuLimits:
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host = custom( CPULimitedHost, sched=sched,
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period_us=period_us,
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cpu=cpu )
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try:
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net = Mininet( topo=topo, host=host )
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# pylint: disable=bare-except
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except:
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info( '*** Skipping host %s\n' % sched )
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break
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net.start()
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net.pingAll()
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hosts = [ net.getNodeByName( h ) for h in topo.hosts() ]
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client, server = hosts[ 0 ], hosts[ -1 ]
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server.cmd( 'iperf -s -p 5001 &' )
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waitListening( client, server, 5001 )
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result = client.cmd( 'iperf -yc -t %s -c %s' % (
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seconds, server.IP() ) ).split( ',' )
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bps = float( result[ -1 ] )
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server.cmdPrint( 'kill %iperf' )
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net.stop()
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updated = results.get( sched, [] )
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updated += [ ( cpu, bps ) ]
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results[ sched ] = updated
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return results
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def dump( results ):
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"Dump results"
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fmt = '%s\t%s\t%s\n'
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info( '\n', fmt % ( 'sched', 'cpu', 'client MB/s' ) )
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for sched in sorted( results.keys() ):
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entries = results[ sched ]
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for cpu, bps in entries:
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pct = '%.2f%%' % ( cpu * 100 )
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mbps = bps / 1e6
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info( fmt % ( sched, pct, mbps ) )
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if __name__ == '__main__':
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setLogLevel( 'info' )
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limits = [ .45, .4, .3, .2, .1 ]
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out = bwtest( limits )
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dump( out )
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