Example/test of link and CPU bandwidth limits.

examples/limit.py

+#!/usr/bin/python
+
+"""
+limit.py: example of using link and CPU limits
+"""
+
+from mininet.net import Mininet
+from mininet.link import TCIntf, Link
+from mininet.node import CPULimitedHost
+from mininet.topolib import TreeTopo
+from mininet.util import custom, quietRun
+from mininet.log import setLogLevel
+from time import sleep
+
+def testLinkLimit( net ):
+    print '*** Testing network bandwidth limit'
+    net.iperf()
+
+def testCpuLimit( net ):
+    print '*** Testing CPU bandwidth limit'
+    h1, h2 = net.hosts
+    h1.cmd( 'while true; do a=1; done &' )
+    h2.cmd( 'while true; do a=1; done &' )
+    pid1 = h1.cmd( 'echo $!' ).strip()
+    pid2 = h2.cmd( 'echo $!' ).strip()
+    cmd = 'ps -p %s,%s -o pid,%%cpu,args' % ( pid1, pid2 )
+    for i in range( 0, 5):
+        sleep( 1 ) 
+        print quietRun( cmd )
+    h1.cmd( 'kill %1')
+    h2.cmd( 'kill %1')
+
+def limit():
+    "Example/test of link and CPU bandwidth limits"
+    # 1 Mbps interfaces limited using tc
+    intf1Mbps = custom( TCIntf, bw=1 )
+    # Links consisting of two 10 Mbps interfaces
+    link1Mbps = custom( Link, intf=intf1Mbps, cls2=TCIntf )
+    # Hosts with 30% of system bandwidth
+    host30pct = custom( CPULimitedHost, cpu=.3 )
+    myTopo = TreeTopo( depth=1, fanout=2 )
+    net = Mininet( topo=myTopo,
+                   link=link1Mbps, 
+                   host=host30pct )
+    net.start()
+    testLinkLimit( net )
+    testCpuLimit( net )
+    net.stop()
+
+if __name__ == '__main__':
+    setLogLevel( 'info' )
+    limit()