Mininet简单性能测试

建一个简单的模型，使用一个单交换机，然后链接n个主机形成拓扑，然后对每个链路设置带宽，延迟时间，和丢包率。

这里就选择建一个单交换机和六个主机的作为例子。

创建py脚本生成拓扑：写一个类生成一个单交换机和六个主机的拓扑，并且给每个主机和交换机之间的连接赋予100m的带宽，5ms的延迟和1%的丢包率。然后通过pingall函数测试连接，iperf函数测试主机间的带宽，

 from mininet.topo import Topo
 from mininet.net import Mininet
 from mininet.node import CPULimitedHost
 from mininet.link import TCLink
 from mininet.util import dumpNodeConnections
 from mininet.log import setLogLevel

 class SingleSwitchTopo(Topo):
     def __init__(self, n=2, **opts):
         Topo.__init__(self, **opts)
         switch = self.addSwitch('s1')
         for h in range(n):
             # Each host gets 50%/n of system CPU
             host = self.addHost('h%s' % (h + 1), cpu=.5/n)
             # 100 Mbps, 5ms delay, 1% Loss, 1000 packet queue
             self.addLink(host, switch, bw=100, delay='5ms', loss=1,
                          max_queue_size=1000, use_htb=True)

 def perfTest():
     topo = SingleSwitchTopo(n=6)
     net = Mininet(topo=topo, host=CPULimitedHost, link=TCLink)
     net.start()
     print "Dumping host connections"
     dumpNodeConnections(net.hosts)
     print "Testing network connectivity"
     net.pingAll()
     print "Testing bandwidth between h1 and h4"
     h1, h4 = net.get('h1', 'h4')
     net.iperf((h1, h4))
     print "Testing bandwidth between h1 and h6"
     h1, h6 = net.get('h1', 'h6')
     net.iperf((h1, h6))
     net.stop()

 if __name__ == '__main__':
     setLogLevel('info')
     perfTest()

　　

ps:如果直接执行出现错误找不到py解释器的话，在代码开头加上#!/usr/bin/python。或者直接使用

 sudo python 文件名.py

 执行

结果如下图所示：

---

瞎搞一波，再试试两个交换机相互连接，然后分别下挂三个主机。link全部赋予10m带宽，5ms延迟和0%的丢包率。

 from mininet.topo import Topo
 from mininet.net import Mininet
 from mininet.node import CPULimitedHost
 from mininet.link import TCLink
 from mininet.util import dumpNodeConnections
 from mininet.log import setLogLevel

 class DoubleSwitchTopo(Topo):
     def __init__(self, n=2, **opts):
         Topo.__init__(self, **opts)
         switch1 = self.addSwitch('s1')
         switch2 = self.addSwitch("s2")
         self.addLink(switch1, switch2, bw=10, delay='5ms',
                      loss=0, max_queue_size=1000, use_htb=True)
         for h in range(n/2):
             host = self.addHost('h%s' % (h + 1), cpu=.5/n)
             self.addLink(host, switch1, bw=10, delay='5ms', loss=0,
                          max_queue_size=1000, use_htb=True)
         for h in range(n/2, n):
             host = self.addHost('h%s' % (h + 1), cpu=.5/n)
             self.addLink(host, switch2, bw=10, delay='5ms', loss=0,
                          max_queue_size=1000, use_htb=True)

 def perfTest():
     topo = DoubleSwitchTopo(n=6)
     net = Mininet(topo=topo, host=CPULimitedHost, link=TCLink)
     net.start()
     print "Dumping host connections"
     dumpNodeConnections(net.hosts)
     print "Testing network connectivity"
     net.pingAll()
     print "Testing bandwidth between h1 and h3"
     h1, h3 = net.get('h1', 'h3')
     net.iperf((h1, h3))
     print "Testing bandwidth between h4 and h6"
     h4, h6 = net.get('h4', 'h6')
     net.iperf((h4, h6))
     net.stop()

 if __name__ == '__main__':
     setLogLevel('info')
     perfTest()

结果如下图：