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Ptolemy Tutorial

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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 ... – PowerPoint PPT presentation

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Title: Ptolemy Tutorial


1
Ptolemy Tutorial
  • What is Ptolemy?
  • How it works?
  • What is the development environment for you
  • Show demo and former simulation work

2
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

3
Organization of the software
4
Domains in Ptolemy
5
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

6
Basic building bocks
7
NamedObj
8
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

9
Domain classes derived
10
Block communication
11
Hierarchical Abstraction
12
Hierarchical Abstraction (cont)
13
Star definition
14
Star definition (cont)
15
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

16
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)

17
DE model (cont.)
18
File organization
19
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)

20
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

21
Running Ptolemy
  • Run Ptolemy demo
  • Go to demo directory
  • cd PTOLEMY/demo
  • Run pigi
  • Run former simulation
  • FC-AL
  • SSA
  • XOR-based disk

22
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

23
Sample code for FC-AL
  • LPSM
  • Input
  • Inbound (from the loop)
  • fromFC2 (FC-2 layer)
  • Output
  • Outbound (to the loop)
  • toFC2 ( to upper layer)

24
LPSM
  • Internal states
  • State (int)
  • AL_PA (int)
  • Fairness (int)
  • progDelay (float)
  • transTime (float)

25
LPSM implementation
  • Methods
  • Setup
  • Go
  • wrapup

26
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

27
New direction of Ptolemy
  • Ptolemy II
  • Java based simulation environment

28
Resources
  • http//ptolemy.eecs.berkeley.edu

29
Resources
  • User Manual
  • Pigi
  • Ptcl
  • Domains
  • Vem
  • Pxgraph
  • installation

30
Resources (cont.)
  • Programmer manual
  • Software organization
  • Writing stars
  • Infrastructure
  • Data types
  • tcl/tk
  • Domains
  • Code generation

31
Resources (cont.)
  • Kernel manual
  • All stars defined in kernel
  • Targets used in kernel
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