def perfTest(lossy=True):
"Create network and run simple performance test"
topo = SingleSwitchTopo(n=4, lossy=lossy)
net = Mininet(topo=topo,
host=CPULimitedHost,
link=TCLink,
autoStaticArp=True)
net.start()
print "Dumping host connections"
dumpNodeConnections(net.hosts)
print "Testing bandwidth between h1 and h4"
h1, h4 = net.getNodeByName('h1', 'h4')
net.iperf((h1, h4), l4Type='UDP')
net.stop()
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)
# pylint: disable=bare-except
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
