Re: Support for resource allocation in Ptolemy?

[Edward A Lee]

At 12:20 PM 6/8/2004 -0400, Steve Rowe wrote:
Hi, hackers.
We are using Ptolemy to do sytem-integration level simulation and testing 
for "smart" vehicles.  Our main areas of interest are monitoring bandwidth 
of network connections and CPU utilization (although we are also modeling 
a number of other things).

Is there a built-in actor that checks for resource (over-) allocation?  I 
have thought about just using a summation of bandwidth, where the 
components in the system output an amount of bandwidth required at a given 
time and then a network simulation component sums these requirements and 
makes sure that the sum doesn't exceed the available.  Is there a better way?

Thanks for any advice you can give.
-Steve
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<mailto:[EMAIL PROTECTED]>Steve Rowe
Research Engineer
<http://www.cybernet.com/>Cybernet
(734) 668-2567 x 132
As part of the Chess Center effort at Berkeley, Prof. Tom Henzinger
and his group developed a concept of "resource interfaces," which
are formal interface definitions with corresponding checkers that
model dynamically changing resource requirements.  See:
A. Chakrabarti, L. d. Alfaro and T. A. Henzinger, "Resource Interfaces,"
In Proceedings of EMSOFT, Philadelphia, PA, LNCS 2855, Springer,
October 13-15, 2003, 2003.
We have done some preliminary experimentation with integrating
this into Ptolemy II... We created a Chic attribute that uses
the Chic verification tool to check interface compatibility.
However, this is far from ready for prime time.
Another approach was realized a few years ago in Prof. Alberto
Sangiovanni-Vincentelli's group under the name Polis. They built
this on Ptolemy Classic, using the DE domain, and built an
actor library that modeled resource usage. This became the centerpiece
of a (not very successful) product from Cadence called VCC.
But there might be ideas worth looking at there.
Hope this is helpful...
Edward

------------
Edward A. Lee, Professor
518 Cory Hall, UC Berkeley, Berkeley, CA 94720
phone: 510-642-0455, fax: 510-642-2739
[EMAIL PROTECTED], http://ptolemy.eecs.berkeley.edu/~eal
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