Distributed Execution of Ptolemy Models

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• Distributed Execution of Ptolemy Models
• Yang Zhao (ellen_zh_at_eecs)
• Thomas H. Feng (tfeng_at_eecs)
• Class Project for EE290N

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Demo
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Overview

• A framework to distributedly execute Ptolemy
  models (currently, PN models)
• DPN (Distributed PN) domain in Ptolemy
• Startup and communication between submodels
• PN semantics (blocking read, blocking write)
• Model deployment
• Communication framework based on CORBA
• Dynamically lookup machines (Naming Service)
• Ptolemy process startup on request (ptAgent)
• Message relay (ptAgent)

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Register (1)
Naming Service
ptAgent
ptAgent
ptAgent
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Register (2)
Naming Service
ptAgent
Register to Naming Service (ptAgent, Models)
ptAgent
ptAgent
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Lookup (1)
Naming Service
ptAgent
Look up to Naming Service (ptAgent, Models)
ptAgent
ptAgent
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Lookup (2)
Naming Service
ptAgent
after look up for ptAgent
ptAgent
ptAgent
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Distributed Execution in Ptolemy

• Two major ways
• Distribute a big model to a set of hosts and have
  them cooperate when executing to maintain the
  entire behavior.
• Discover applications or models currently running
  in the system and join them ex, distributed
  games, chat rooms.

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Lookup for Available ptAgents
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Configuration
DOPLAP11
DOPLAP11
DOPLAP19
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Model Deployment
Parse the model with the given configuration
DOPLAP11
DOPLAP11
DOPLAP19
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Model Deployment
Double click to distribute model.
ptAgent
ptAgent
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Model Deployment
Double click to distribute model.
Launch/start model
Launch/start model
ptAgent
ptAgent
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Model Execution
CommunicationHelper
CommunicationHelper
ptAgent
ptAgent
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Distributed Execution
Publisher/Consumer
Publisher/Consumer
CommunicationHelper
CommunicationHelper
Event channel
ptAgent
ptAgent
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Distributed Execution in Ptolemy

• Two major ways
• Distribute a big model to a set of hosts and have
  them cooperate when executing to maintain the
  entire behavior.
• Discover applications or models currently running
  in the system and join them ex, distributed
  games, chat rooms.

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Chat demo
ptAgent
ptAgent
Host1
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Chat demo
ptAgent
ptAgent
Host1
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Chat demo
connect to
ptAgent
ptAgent
Host1
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Yet another way to use
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Yet another way to use
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Future Work

• Extend the current implementation to support more
  domains (e.g., DE, SDF)
• Improve communication efficiency to enable
  high-performance execution
• To preserve the semantics of timed domains,
  realize backtracking with AspectJ
• Provide more facility at a lower level, e.g.,
  communication observer, debugger and life-time
  management