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#
# Copyright (c) 1997 by the University of Southern California
# All rights reserved.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License,
# version 2, as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
#
# The copyright of this module includes the following
# linking-with-specific-other-licenses addition:
#
# In addition, as a special exception, the copyright holders of
# this module give you permission to combine (via static or
# dynamic linking) this module with free software programs or
# libraries that are released under the GNU LGPL and with code
# included in the standard release of ns-2 under the Apache 2.0
# license or under otherwise-compatible licenses with advertising
# requirements (or modified versions of such code, with unchanged
# license). You may copy and distribute such a system following the
# terms of the GNU GPL for this module and the licenses of the
# other code concerned, provided that you include the source code of
# that other code when and as the GNU GPL requires distribution of
# source code.
#
# Note that people who make modified versions of this module
# are not obligated to grant this special exception for their
# modified versions; it is their choice whether to do so. The GNU
# General Public License gives permission to release a modified
# version without this exception; this exception also makes it
# possible to release a modified version which carries forward this
# exception.
#
# $Header: /cvsroot/nsnam/ns-2/tcl/ex/simple-webcache-trace.tcl,v 1.2 2005/09/16 03:05:41 tomh Exp $
# Demo of simple trace-driven web sim
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/Proxy Trace
set pgp [new PagePool/ProxyTrace]
# Set trace files. There are two files; one for request stream, the other for
# page information, e.g., size and id
#
# XXX Assuming current directory is ~ns/tcl/ex. Use traces under ~ns/tcl/test
$pgp set-reqfile "../test/webtrace-reqlog"
$pgp set-pagefile "../test/webtrace-pglog"
# Set number of clients that will use this page pool. It's used to assign
# requests to clients
$pgp set-client-num 1
# Set the ratio of hot pages in all pages. Because no page modification
# data is available in most traces, we assume a bimodal page age distribution
$pgp bimodal-ratio 0.1
# Dynamic (hot) page age generator
set tmp [new RandomVariable/Exponential] ;# Age generator
$tmp set avg_ 5 ;# average page age
$pgp ranvar-dp $tmp
# Static page age generator
set tmp [new RandomVariable/Constant]
$tmp set val_ 10000
$pgp ranvar-sp $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)]
# XXX When trace-driven, don't assign a request interval generator
$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
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