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Copy pathcpu.py
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executable file
·81 lines (64 loc) · 2.32 KB
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#!/usr/bin/python
"""
cpu.py: test iperf bandwidth for varying cpu limtis
"""
from mininet.net import Mininet
from mininet.node import CPULimitedHost
from mininet.topolib import TreeTopo
from mininet.util import custom
from mininet.log import setLogLevel, output
from time import sleep
def waitListening(client, server, port):
"Wait until server is listening on port"
if not client.cmd('which telnet'):
raise Exception('Could not find telnet')
cmd = ('sh -c "echo A | telnet -e A %s %s"' %
(server.IP(), port))
while 'Connected' not in client.cmd(cmd):
output('waiting for', server,
'to listen on port', port, '\n')
sleep(.5)
def bwtest( cpuLimits, period_us=100000, seconds=5 ):
"""Example/test of link and CPU bandwidth limits
cpu: cpu limit as fraction of overall CPU time"""
topo = TreeTopo( depth=1, fanout=2 )
results = {}
for sched in 'rt', 'cfs':
print '*** Testing with', sched, 'bandwidth limiting'
for cpu in cpuLimits:
host = custom( CPULimitedHost, sched=sched,
period_us=period_us,
cpu=cpu )
net = Mininet( topo=topo, host=host )
net.start()
net.pingAll()
hosts = [ net.getNodeByName( h ) for h in topo.hosts() ]
client, server = hosts[ 0 ], hosts[ -1 ]
server.cmd( 'iperf -s -p 5001 &' )
waitListening( client, server, 5001 )
result = client.cmd( 'iperf -yc -t %s -c %s' % (
seconds, server.IP() ) ).split( ',' )
bps = float( result[ -1 ] )
server.cmdPrint( 'kill %iperf' )
net.stop()
updated = results.get( sched, [] )
updated += [ ( cpu, bps ) ]
results[ sched ] = updated
return results
def dump( results ):
"Dump results"
fmt = '%s\t%s\t%s'
print
print fmt % ( 'sched', 'cpu', 'client MB/s' )
print
for sched in sorted( results.keys() ):
entries = results[ sched ]
for cpu, bps in entries:
pct = '%.2f%%' % ( cpu * 100 )
mbps = bps / 1e6
print fmt % ( sched, pct, mbps )
if __name__ == '__main__':
setLogLevel( 'info' )
limits = [ .45, .4, .3, .2, .1 ]
out = bwtest( limits )
dump( out )