Re: Web Traffic Simulation

[Felix Hernandez Campos <fhernand@cs.unc.edu>]

Lloyd Wood wrote:

> Read:
> http://www-mash.cs.berkeley.edu/dist/archive/ns-users/0001/0210.html
> http://www-mash.cs.berkeley.edu/dist/archive/ns-users/9912/0068.html
>
> It'll probably fix itself if you upgrade your ns.
>

Neither the most recent release (ns-2.1b6) nor the daily snapshot are correct. It
looks like the patch hasn't been applied... Arnaud Legout already pointed this
out, and I couldn't find an answer to his message
(http://www-mash.cs.berkeley.edu/dist/archive/ns-users/0001/0228.html).

> L.
>
> <L.Wood@surrey.ac.uk>PGP<http://www.ee.surrey.ac.uk/Personal/L.Wood/>
>
> On Wed, 23 Feb 2000, Felix Hernandez Campos wrote:
>
> > Date: Wed, 23 Feb 2000 20:09:44 -0500
> > From: Felix Hernandez Campos <fhernand@cs.unc.edu>
> > To: NS-USERS <ns-users@mash.CS.Berkeley.EDU>
> > Subject: Web Traffic Simulation
> >
> > I'd tried to run ns/tcl/ex/web-traffic.tcl and I got a strange result. The
> > simulation aborts well before its termination time, returning the following
> > message:
> >
> > done pages 10 != all pages 9
> >
> > The problem seems to be in ns/webcache/webtraf.cc, where the destructor is:
> >
> > // XXX Must delete this after all pages are done!!
> > WebTrafSession::~WebTrafSession()
> > {
> >         if (donePage_ != curPage_) {
> >                 fprintf(stderr, "done pages %d != all pages %d\n",
> >                         donePage_, curPage_);
> >                 abort();
> >         }
> >         ...
> > }
> >
> > I don't understand webtraff.cc well enough to tell whether the condition in
> > the if statement is wrong or something else is happening. Could someone tell
> > me how to solve this problem? Thanks for your help.
> >
> > --Felix Hernandez