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Copy pathcpu.py
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executable file
·73 lines (58 loc) · 2.06 KB
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#!/usr/bin/python
"""
cpu.py: test iperf bandwidth for varying cpu limits
"""
from mininet.net import Mininet
from mininet.node import CPULimitedHost
from mininet.topolib import TreeTopo
from mininet.util import custom, waitListening
from mininet.log import setLogLevel, output, info
from time import sleep
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 )
try:
net = Mininet( topo=topo, host=host )
except:
info( '*** Skipping host %s\n' % sched )
break
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 )