#!/usr/bin/python
"""
udpbwgraph: Plot network bandwidth over time
Bob Lantz
3/27/10
"""
from time import sleep
import os
import re
import sys
from time import time
from Tkinter import *
from mininet.log import setLogLevel
from mininet.net import init, Mininet
from mininet.node import KernelSwitch, UserSwitch, OVSKernelSwitch
from mininet.node import Controller, NOX
from mininet.topolib import TreeTopo
from mininet.util import quietRun
# bwtest support
class Graph( Frame ):
"Graph that we can add bars to over time."
def __init__( self, master=None,
bg = 'white',
gheight=200, gwidth=500,
barwidth=10,
ymax=3.5,):
Frame.__init__( self, master )
self.bg = bg
self.gheight = gheight
self.gwidth = gwidth
self.barwidth = barwidth
self.ymax = float( ymax )
self.xpos = 0
# Create everything
self.title = self.graph = None
self.createWidgets()
self.updateScrollRegions()
self.yview( 'moveto', '1.0' )
def scale( self ):
"Create a and return a new canvas with scale markers."
height = float( self.gheight )
width = 25
ymax = self.ymax
scale = Canvas( self, width=width, height=height, background=self.bg )
fill = 'red'
# Draw scale line
scale.create_line( width - 1, height, width - 1, 0, fill=fill )
# Draw ticks and numbers
for y in range( 0, int( ymax + 1 ) ):
ypos = height * (1 - float( y ) / ymax )
scale.create_line( width, ypos, width - 10, ypos, fill=fill )
scale.create_text( 10, ypos, text=str( y ), fill=fill )
return scale
def updateScrollRegions( self ):
"Update graph and scale scroll regions."
ofs = 20
height = self.gheight + ofs
self.graph.configure( scrollregion=( 0, -ofs,
self.xpos * self.barwidth, height ) )
self.scale.configure( scrollregion=( 0, -ofs, 0, height ) )
def yview( self, *args ):
"Scroll both scale and graph."
self.graph.yview( *args )
self.scale.yview( *args )
def createWidgets( self ):
"Create initial widget set."
# Objects
title = Label( self, text="Bandwidth (Mb/s)", bg=self.bg )
width = self.gwidth
height = self.gheight
scale = self.scale()
graph = Canvas( self, width=width, height=height, background=self.bg)
xbar = Scrollbar( self, orient='horizontal', command=graph.xview )
ybar = Scrollbar( self, orient='vertical', command=self.yview )
graph.configure( xscrollcommand=xbar.set, yscrollcommand=ybar.set,
scrollregion=(0, 0, width, height ) )
scale.configure( yscrollcommand=ybar.set )
# Layout
title.grid( row=0, columnspan=3, sticky=N+E+W)
scale.grid( row=1, column=0, sticky=N+S+E+W )
graph.grid( row=1, column=1, sticky=N+S+E+W )
ybar.grid( row=1, column=2, sticky=N+S )
xbar.grid( row=2, column=0, columnspan=2, sticky=E+W )
self.rowconfigure( 1, weight=1 )
self.columnconfigure( 1, weight=1 )
# Save for future reference
self.title = title
self.scale = scale
self.graph = graph
return graph
def addBar( self, yval ):
"Add a new bar to our graph."
percent = yval / self.ymax
height = percent * self.gheight
c = self.graph
x0 = self.xpos * self.barwidth
x1 = x0 + self.barwidth
y0 = self.gheight
y1 = ( 1 - percent ) * self.gheight
c.create_rectangle( x0 , y0, x1, y1, fill='green' )
self.xpos += 1
self.updateScrollRegions()
self.graph.xview( 'moveto', '1.0' )
def test( self ):
"Add a bar for testing purposes."
ms = 1000
if self.xpos < 10:
self.addBar( self.xpos/10 * self.ymax )
self.after( ms, self.test )
def setTitle( self, text ):
"Set graph title"
self.title.configure( text=text, font='Helvetica 9 bold' )
class Controls( Frame ):
"Handy controls for configuring test."
switches = {
'Kernel Switch': KernelSwitch,
'User Switch': UserSwitch,
'Open vSwitch': OVSKernelSwitch
}
controllers = {
'Reference Controller': Controller,
'NOX': NOX
}
def __init__( self, master=None ):
Frame.__init__( self, master )
self.switch = StringVar()
self.switch.set( 'Kernel Switch' )
self.switchMenu = OptionMenu( self, self.switch,
*( switches.keys() ) )
self.controller = StringVar()
self.controller.set( 'Reference Controller' )
self.controllerMenu = OpetionMenu( self, self.controller,
*( controllers.keys() ) )
def App( Frame ):
def parsebwtest( line,
r=re.compile( r'(\d+) s: in ([\d\.]+) Mbps, out ([\d\.]+) Mbps' ) ):
"Parse udpbwtest.c output, returning seconds, inbw, outbw."
match = r.match( line )
if match:
seconds, inbw, outbw = match.group( 1, 2, 3 )
return int( seconds ), float( inbw ), float( outbw )
return None, None, None
class UdpBwTest( object ):
"Test and plot UDP bandwidth over time"
def __init__( self, graph, net, seconds=60 ):
"Start up and monitor udpbwtest on each of our hosts."
hosts = net.hosts
self.graph = graph
self.hostCount = len( hosts )
print "*** Starting udpbwtest on hosts"
for host in hosts:
ips = [ h.IP() for h in hosts if h != host ]
host.cmdPrint( './udpbwtest ' + ' '.join( ips ) + ' &' )
print "*** Monitoring hosts"
self.output = net.monitor( hosts, timeoutms=0 )
self.results = {}
self.quitTime = time() + seconds
self.updateGraph()
# Pylint isn't smart enough to understand iterator.next()
# pylint: disable-msg=E1101
def updateGraph( self ):
"Graph input bandwidth."
while True:
host, line = self.output.next()
if host is None or len( line ) == 0:
break
seconds, inbw, outbw = parsebwtest( line )
if seconds is None:
break
result = self.results.get( seconds, [] ) + [ ( host, inbw, outbw ) ]
self.results[ seconds ] = result
if len( result ) == self.hostCount:
# Calculate total and update graph
# We report input bandwidth, i.e. packets that made it
totalin = 0
for host, inbw, outbw in result:
totalin += inbw
self.graph.addBar( totalin / 1000.0 )
print totalin
if time() < self.quitTime:
# Fileevent would be better, but for now we just poll every 500ms
self.graph.after( 10, self.updateGraph )
else:
self.shutdown()
def shutdown( self ):
"Stop udpbwtest proceses."
print "*** Stopping udpbwtest processes"
# We *really* don't want these things hanging around!
quietRun( 'killall -9 udpbwtest' )
# pylint: enable-msg=E1101
if __name__ == '__main__':
setLogLevel( 'info' )
app = Graph()
app.master.title( "Mininet Bandwidth" )
depth, fanout = 1, 2
net = Mininet( topo=TreeTopo( depth=depth, fanout=fanout),
switch=KernelSwitch )
title = "Bandwidth (Mb/s), (%i hosts, %i switches, depth=%d, fanout=%d)" % (
len( net.hosts ), len( net.switches), depth, fanout )
app.setTitle( title )
net.start()
test = UdpBwTest( app, net )
app.mainloop()
net.stop()
test.shutdown() # just in case!