Ptolemy Tutorial What is Ptolemy? How it works? What is the development

environment for you Show demo and former simulation

work

What is Ptolemy Ptolemy is a software

infrastructure (kernel) developed by EECS dept, Berkeley Object-oriented Support modeling, simulation, design

and code generation for concurrent, embedded real-time system.

Support multiple domains Support heterogeneous environment

Organization of the software

Domains in Ptolemy

Ptolemy executables Pigi

All domains and targets plus GUI Ptrim

SDF,BDF,DDF,DE,CGC and HOF domains plus GUI

Ptiny SDF and DE domains plus GUI

Ptcl All domains, no GUI

Basic building bocks

NamedObj

Basic building blocks Star: lowest level block in Ptolemy, with

functionality defined in c++ Galaxy: A block consisting of sub-blocks

with input and output. Universe: An outmost block defining a

executable system Domain: A model of computation, defining

the behavior of a network of objects Wormhole: A galaxy with different

domains from inside and outside

Domain classes derived

Block communication

Hierarchical Abstraction

Hierarchical Abstraction (cont)

Star definition

Star definition (cont)

DE model Provides a generic environment for

time-oriented simulation system Queuing system Communication network High-level modeling of computer

architecture Particles represent event: change

of system state

DE model Each particle has an associated

timestamp A global event queue sorts events

by timestamp DE processes event in a

chronological order (fetches the first one)

DE model (cont.)

File organization

Setup your environment Environment variables:

PTOLEMY: full path name of ptolemy installation

PTARCH: the platform on which Ptolemy is running

Setup environment (put in .cshrc) setenv PTOLEMY ~ptolemy setenv PTARCH `$PTOLEMY/bin/ptarch` setenv path = ($PTOLEMY/bin $PTOLEMY/bin.

$PTARCH $path)

Setup environment (cont.) On machines in cs dept

View available module Module ptolemy

Load Ptolemy Module load soft/ptolemy

Setup JAVAHOME environment variable

setenv JAVAHOME /soft/java/SunOS5.6/JDK-1.3

Running Ptolemy Run Ptolemy demo

Go to demo directory cd $PTOLEMY/demo

Run pigi Run former simulation

FC-AL SSA XOR-based disk

Using GUI Programs:

Vem Oct pigiRPC

Design objects Oct: design manager and database Facet: a design object(schematic or palette) Schematic: a design block diagram Palette: a facet containing a library of icons

Sample code for FC-AL LPSM

Input Inbound (from the loop) fromFC2 (FC-2 layer)

Output Outbound (to the loop) toFC2 ( to upper layer)

LPSM Internal states:

State (int) AL_PA (int) Fairness (int) progDelay (float) transTime (float)

LPSM implementation Methods:

Setup Go wrapup

Checklist to write your own simulation system Have a overview of Ptolemy Conduct Architectural design of your system

Basic star Galaxy Universe

Get familiar with the Ptolemy running environment, draw the schematic diagram

Implement all your stars Tweak and run your simulation Analyze the result

New direction of Ptolemy Ptolemy II

Java based simulation environment

Resources http://ptolemy.eecs.berkeley.edu

Resources User Manual:

Pigi Ptcl Domains Vem Pxgraph installation

Resources (cont.) Programmer manual

Software organization Writing stars Infrastructure Data types tcl/tk Domains Code generation

Resources (cont.) Kernel manual

All stars defined in kernel Targets used in kernel