simple-webcache.tcl

跑leach需要的

#
#  Copyright (c) 1997 by the University of Southern California
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#  developed by the University of Southern California, Information
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#  $Header: /nfs/jade/vint/CVSROOT/ns-2/tcl/ex/simple-webcache.tcl,v 1.1 1998/08/25 17:34:48 haoboy Exp $

set ns [new Simulator]

# Create topology/routing
set node(c) [$ns node] 
set node(e) [$ns node]
set node(s) [$ns node]
$ns duplex-link $node(s) $node(e) 1.5Mb 50ms DropTail
$ns duplex-link $node(e) $node(c) 10Mb 2ms DropTail 
$ns rtproto Session

# HTTP logs
set log [open "http.log" w]

# Use PagePool/Math
set pgp [new PagePool/Math]
set tmp [new RandomVariable/Constant] ;# Size generator
$tmp set val_ 1024  ;# average page size
$pgp ranvar-size $tmp
set tmp [new RandomVariable/Exponential] ;# Age generator
$tmp set avg_ 5 ;# average page age
$pgp ranvar-age $tmp

set server [new Http/Server $ns $node(s)]
$server set-page-generator $pgp
$server log $log

set cache [new Http/Cache $ns $node(e)]
$cache log $log

set client [new Http/Client $ns $node(c)]
set tmp [new RandomVariable/Exponential] ;# Poisson process
$tmp set avg_ 5 ;# average request interval
$client set-interval-generator $tmp
$client set-page-generator $pgp
$client log $log

set startTime 1 ;# simulation start time
set finishTime 50 ;# simulation end time
$ns at $startTime "start-connection"
$ns at $finishTime "finish"

proc start-connection {} {
	global ns server cache client
	$client connect $cache
	$cache connect $server
	$client start-session $cache $server
}

proc finish {} {
	global ns log
	$ns flush-trace
	flush $log
	close $log
	exit 0
}

$ns run