def limit( bw=10, cpu=.1 ):
"""Example/test of link and CPU bandwidth limits
bw: interface bandwidth limit in Mbps
cpu: cpu limit as fraction of overall CPU time"""
intf = custom( TCIntf, bw=bw )
myTopo = TreeTopo( depth=1, fanout=2 )
for sched in 'rt', 'cfs':
print '*** Testing with', sched, 'bandwidth limiting'
host = custom( CPULimitedHost, sched=sched, cpu=cpu )
net = Mininet( topo=myTopo, intf=intf, host=host )
net.start()
testLinkLimit( net, bw=bw )
net.runCpuLimitTest( cpu=cpu )
net.stop()
def limit(bw=10, cpu=.1):
"""Example/test of link and CPU bandwidth limits
bw: interface bandwidth limit in Mbps
cpu: cpu limit as fraction of overall CPU time"""
intf = custom(TCIntf, bw=bw)
myTopo = TreeTopo(depth=1, fanout=2)
for sched in 'rt', 'cfs':
print '*** Testing with', sched, 'bandwidth limiting'
host = custom(CPULimitedHost, sched=sched, cpu=cpu)
net = Mininet(topo=myTopo, intf=intf, host=host)
net.start()
testLinkLimit(net, bw=bw)
net.runCpuLimitTest(cpu=cpu)
net.stop()
def testCPULimits(self):
"Verify topology creation with CPU limits set for both schedulers."
CPU_FRACTION = 0.1
CPU_TOLERANCE = 0.8 # CPU fraction below which test should fail
hopts = {'cpu': CPU_FRACTION}
#self.runOptionsTopoTest( N, hopts=hopts )
mn = Mininet(SingleSwitchOptionsTopo(n=N, hopts=hopts),
host=CPULimitedHost,
switch=self.switchClass,
waitConnected=True)
mn.start()
results = mn.runCpuLimitTest(cpu=CPU_FRACTION)
mn.stop()
hostUsage = '\n'.join('h%s: %s' %
(n + 1, results[(n - 1) * 5:(n * 5) - 1])
for n in range(N))
hoptsStr = ', '.join('%s: %s' % (opt, value)
for opt, value in hopts.items())
msg = ('\nTesting cpu limited to %d%% of cpu per host\n'
'cpu usage percent per host:\n%s\n'
'Topo = SingleSwitchTopo, %s hosts\n'
'hopts = %s\n'
'host = CPULimitedHost\n'
'Switch = %s\n' %
(CPU_FRACTION * 100, hostUsage, N, hoptsStr, self.switchClass))
for pct in results:
#divide cpu by 100 to convert from percentage to fraction
self.assertWithinTolerance(pct / 100, CPU_FRACTION, CPU_TOLERANCE,
msg)
def testCPULimits( self ):
"Verify topology creation with CPU limits set for both schedulers."
CPU_FRACTION = 0.1
CPU_TOLERANCE = 0.8 # CPU fraction below which test should fail
hopts = { 'cpu': CPU_FRACTION }
#self.runOptionsTopoTest( N, hopts=hopts )
mn = Mininet( SingleSwitchOptionsTopo( n=N, hopts=hopts ),
host=CPULimitedHost, switch=self.switchClass,
waitConnected=True )
mn.start()
results = mn.runCpuLimitTest( cpu=CPU_FRACTION )
mn.stop()
hostUsage = '\n'.join( 'h%s: %s' %
( n + 1,
results[ (n - 1) * 5 : (n * 5) - 1 ] )
for n in range( N ) )
hoptsStr = ', '.join( '%s: %s' % ( opt, value )
for opt, value in hopts.items() )
msg = ( '\nTesting cpu limited to %d%% of cpu per host\n'
'cpu usage percent per host:\n%s\n'
'Topo = SingleSwitchTopo, %s hosts\n'
'hopts = %s\n'
'host = CPULimitedHost\n'
'Switch = %s\n'
% ( CPU_FRACTION * 100, hostUsage, N, hoptsStr,
self.switchClass ) )
for pct in results:
#divide cpu by 100 to convert from percentage to fraction
self.assertWithinTolerance( pct/100, CPU_FRACTION,
CPU_TOLERANCE, msg )
def limit( bw=10, cpu=.1 ):
"""Example/test of link and CPU bandwidth limits
bw: interface bandwidth limit in Mbps
cpu: cpu limit as fraction of overall CPU time"""
intf = custom( TCIntf, bw=bw )
myTopo = TreeTopo( depth=1, fanout=2 )
for sched in 'rt', 'cfs':
info( '*** Testing with', sched, 'bandwidth limiting\n' )
if sched == 'rt':
release = quietRun( 'uname -r' ).strip('\r\n')
output = quietRun( 'grep CONFIG_RT_GROUP_SCHED /boot/config-%s' % release )
if output == '# CONFIG_RT_GROUP_SCHED is not set\n':
info( '*** RT Scheduler is not enabled in your kernel. Skipping this test\n' )
continue
host = custom( CPULimitedHost, sched=sched, cpu=cpu )
net = Mininet( topo=myTopo, intf=intf, host=host )
net.start()
testLinkLimit( net, bw=bw )
net.runCpuLimitTest( cpu=cpu )
net.stop()
def testCPULimits(self):
"Verify topology creation with CPU limits set for both schedulers."
CPU_FRACTION = 0.1
CPU_TOLERANCE = 0.8 # CPU fraction below which test should fail
hopts = {"cpu": CPU_FRACTION}
# self.runOptionsTopoTest( N, hopts=hopts )
mn = Mininet(SingleSwitchOptionsTopo(n=N, hopts=hopts), host=CPULimitedHost)
mn.start()
results = mn.runCpuLimitTest(cpu=CPU_FRACTION)
mn.stop()
for cpu in results:
self.assertWithinTolerance(cpu, CPU_FRACTION, CPU_TOLERANCE)
def limit(bw=10, cpu=.1):
"""Example/test of link and CPU bandwidth limits
bw: interface bandwidth limit in Mbps
cpu: cpu limit as fraction of overall CPU time"""
intf = custom(TCIntf, bw=bw)
myTopo = TreeTopo(depth=1, fanout=2)
for sched in 'rt', 'cfs':
info('*** Testing with', sched, 'bandwidth limiting\n')
if sched == 'rt':
release = quietRun('uname -r').strip('\r\n')
output = quietRun('grep CONFIG_RT_GROUP_SCHED /boot/config-%s' %
release)
if output == '# CONFIG_RT_GROUP_SCHED is not set\n':
info('*** RT Scheduler is not enabled in your kernel. '
'Skipping this test\n')
continue
host = custom(CPULimitedHost, sched=sched, cpu=cpu)
net = Mininet(topo=myTopo, intf=intf, host=host, waitConnected=True)
net.start()
testLinkLimit(net, bw=bw)
net.runCpuLimitTest(cpu=cpu)
net.stop()
def testCPULimits( self ):
"Verify topology creation with CPU limits set for both schedulers."
CPU_FRACTION = 0.1
CPU_TOLERANCE = 0.8 # CPU fraction below which test should fail
hopts = { 'cpu': CPU_FRACTION }
#self.runOptionsTopoTest( N, hopts=hopts )
mn = Mininet( SingleSwitchOptionsTopo( n=N, hopts=hopts ),
host=CPULimitedHost, switch=self.switchClass )
mn.start()
results = mn.runCpuLimitTest( cpu=CPU_FRACTION )
mn.stop()
for cpu in results:
self.assertWithinTolerance( cpu, CPU_FRACTION, CPU_TOLERANCE )
def testCPULimits( self ):
"Verify topology creation with CPU limits set for both schedulers."
CPU_FRACTION = 0.1
CPU_TOLERANCE = 0.8 # CPU fraction below which test should fail
hopts = { 'cpu': CPU_FRACTION }
#self.runOptionsTopoTest( N, hopts=hopts )
mn = Mininet( SingleSwitchOptionsTopo( n=N, hopts=hopts ),
host=CPULimitedHost, switch=self.switchClass )
mn.start()
results = mn.runCpuLimitTest( cpu=CPU_FRACTION )
mn.stop()
for pct in results:
#divide cpu by 100 to convert from percentage to fraction
self.assertWithinTolerance( pct/100, CPU_FRACTION, CPU_TOLERANCE )
