[sim-wg] TOSSIM and the 2.1 Release

[Chad Metcalf]

Phil, do you have a more firm target for the 2.1 release? End of 2007?
So several months maybe 4, 5, or 6?

> Life is going to be very busy for me for the next few weeks (NSDI is
> approaching), but I might be able to take a look today. Having a
> serial forwarder would require either multithreading in Python or
> polling the SF, right? Or did you write it as C/C++?

It's written in C and is in large part just the C SF embedded in
TOSSIM. To avoid multithreading and make it available in C and Python
the user is required to call the processing loop.

   38  while(t->time() < 600 * t->ticksPerSecond()) {
   39    throttle.checkThrottle();
   40    sf.process();
   41    t->runNextEvent();
   42  }

   46 for i in range(0, 20):
   47   throttle.checkThrottle()
   48   sf.process()
   49   t.runNextEvent()

This was the simplest way I thought to handle it. The SF forwards all
serial traffic out, setting the source. All serial traffic in is
delivered to the specified destination (broadcast not implemented).
Ignore the calls to the throttle, thats the other half of the TOSSIM
Live extensions.

> It would be great to incorporate this into the main tree. My one
> major concern is radio simulation: if there's power information,
> people will latch onto it as an evaluation mechanism, which means
> that the radio simulation needs to be reasonable (or at least
> pessimistic).

I agree. Venkatesh can you pitch in some information as to how your
packet level simulation is going and where you think it will be in the
next couple of months?

> Tal and I have been working on this. At the very least, I am going to
> incorporate a log-shadowing model to add some short-term temporal
> variation to RSSI. Tal's been looking at how to model longer-term
> swings.

Great, so this is targeted to the 2.1 release?

-- 
Chad @ Home