ptolemy.distributed.domains.sdf.kernel
Class DistributedSDFDirector

java.lang.Object
  ptolemy.kernel.util.NamedObj
      ptolemy.kernel.util.Attribute
          ptolemy.actor.Director
              ptolemy.actor.sched.StaticSchedulingDirector
                  ptolemy.domains.sdf.kernel.SDFDirector
                      ptolemy.distributed.domains.sdf.kernel.DistributedSDFDirector

All Implemented Interfaces:

Changeable, java.lang.Cloneable, Debuggable, DebugListener, Derivable, Executable, ModelErrorHandler, MoMLExportable, Moveable, Nameable, java.io.Serializable

public class DistributedSDFDirector

extends SDFDirector

Director for the distributed version of the synchronous dataflow (SDF) model of computation.

Distributed-SDF overview

The Distributed-SDF domain is an extended version of the existing SDF Domain that performs the simulation in a distributed manner.

Requirements

• A distributed platform is required to perform the simulation.
• Every node in the distributed platform has to run a server application (DistributedServerRMIGeneric).
• A Jini service locator must be running on one of the nodes (peer discovery).

Features

• Exploits the degree of parallelism that many models expose in their topology.
• The distributed execution is transparent to the user.
• Keeps the existing software architecture untouched, only extending it. (Except some minor modifications in the SDFScheduler).
• It achieves smaller simulation times for models with certain degree of parallelism, specially those were: cost(computation) >>>> cost(communication).
• Allows for bigger models (in terms of memory consumption).

A DistributedSDFDirector is the class that controls execution of actors under the distributed version of the SDF domain. It extends SDFDirector.

By default, actor scheduling is handled by the DistributedSDFScheduler class. Furthermore, the newReceiver method creates Receivers of type DistributedSDFReceiver, which extends SDFReceiver.

See ptolemy.domains.sdf.kernel.SDFScheduler for more information about the SDF Domain.

Parameters

• The parallelSchedule parameter of this director determines whether a sequential or parallel schedule will be performed. The default value of the parallelSchedule parameter is a BooleanToken with the value false.
• The parallelExecution parameter of this director determines whether a sequential or parallel execution will be performed. The default value of the parallelExecution parameter is a BooleanToken with the value false.

Since:

Ptolemy II 5.1

Version:

$Id: DistributedSDFDirector.java,v 1.21.4.1 2006/12/30 22:17:39 cxh Exp $

Author:

Daniel Lazaro Cuadrado (kapokasa@kom.aau.dk)

See Also:

DistributedServerRMIGeneric, DistributedSDFReceiver, DistributedSDFScheduler, SDFDirector, SDFScheduler, Serialized Form

Accepted Rating:

Red (cxh)

Proposed Rating:

Red (kapokasa)

Nested Class Summary

Nested classes inherited from class ptolemy.kernel.util.NamedObj

NamedObj.ContainedObjectsIterator

Field Summary

Parameter	parallelExecution A Parameter representing whether a sequential or parallel execution will be performed.
Parameter	parallelSchedule A Parameter representing whether a sequential or parallel schedule will be computed.
Parameter	pipelining A Parameter representing whether a pipelined parallel execution will be performed.

Fields inherited from class ptolemy.domains.sdf.kernel.SDFDirector

_iterationCount, allowDisconnectedGraphs, allowRateChanges, constrainBufferSizes, iterations, period, synchronizeToRealTime, vectorizationFactor

Fields inherited from class ptolemy.actor.sched.StaticSchedulingDirector

_postfireReturns

Fields inherited from class ptolemy.actor.Director

_actorsFinishedExecution, _currentTime, _stopRequested, timeResolution

Fields inherited from class ptolemy.kernel.util.NamedObj

_changeListeners, _changeLock, _changeRequests, _debugging, _debugListeners, _elementName, _isPersistent, _verbose, _workspace, ATTRIBUTES, CLASSNAME, COMPLETE, CONTENTS, DEEP, FULLNAME, LINKS

Fields inherited from interface ptolemy.actor.Executable

COMPLETED, NOT_READY, STOP_ITERATING

Constructor Summary

DistributedSDFDirector()
Construct a director in the default workspace with an empty string as its name.

DistributedSDFDirector(CompositeEntity container, java.lang.String name)
Construct a director in the given container with the given name.

DistributedSDFDirector(Workspace workspace)
Construct a director in the workspace with an empty name.

Method Summary

void	attributeChanged(Attribute attribute) React to a change in an attribute.
void	fire() Calculate the current schedule, if necessary, and iterate the contained actors in the order given by the schedule.
void	initialize() Initialize the actors associated with this director (super).
Receiver	newReceiver() Return a new receiver consistent with the Distributed-SDF domain.
void	preinitialize() Preinitialize the actors associated with this director and compute the schedule (super).
void	wrapup() Invoke the wrapup() method of all the actors contained in the director's container (super).

Methods inherited from class ptolemy.domains.sdf.kernel.SDFDirector

getModelNextIterationTime, postfire, prefire, suggestedModalModelDirectors, supportMultirateFiring, transferInputs, transferOutputs

Methods inherited from class ptolemy.actor.sched.StaticSchedulingDirector

_setScheduler, addDebugListener, getScheduler, invalidateSchedule, isScheduleValid, removeDebugListener, setScheduler

Methods inherited from class ptolemy.actor.Director

_description, _isEmbedded, _isTopLevel, _transferInputs, _transferOutputs, fireAt, fireAt, fireAtCurrentTime, getCurrentTime, getErrorTolerance, getModelStartTime, getModelStopTime, getModelTime, getNextIterationTime, getStartTime, getStopTime, getTimeResolution, initialize, invalidateResolvedTypes, isFireFunctional, isStopRequested, isStrict, iterate, requestInitialization, setContainer, setCurrentTime, setModelTime, stop, stopFire, terminate

Methods inherited from class ptolemy.kernel.util.Attribute

_getContainedObject, _propagateExistence, clone, getContainer, moveDown, moveToFirst, moveToIndex, moveToLast, moveUp, setName, updateContent

Methods inherited from class ptolemy.kernel.util.NamedObj

_addAttribute, _adjustOverride, _attachText, _cloneFixAttributeFields, _debug, _debug, _debug, _debug, _debug, _exportMoMLContents, _getIndentPrefix, _isMoMLSuppressed, _markContentsDerived, _propagateValue, _removeAttribute, _splitName, _stripNumericSuffix, _validateSettables, addChangeListener, attributeList, attributeList, attributeTypeChanged, clone, containedObjectsIterator, deepContains, depthInHierarchy, description, description, event, executeChangeRequests, exportMoML, exportMoML, exportMoML, exportMoML, exportMoML, exportMoMLPlain, getAttribute, getAttribute, getAttributes, getChangeListeners, getClassName, getDerivedLevel, getDerivedList, getDisplayName, getElementName, getFullName, getModelErrorHandler, getName, getName, getPrototypeList, getSource, handleModelError, isDeferringChangeRequests, isOverridden, isPersistent, message, propagateExistence, propagateValue, propagateValues, removeChangeListener, requestChange, setClassName, setDeferringChangeRequests, setDerivedLevel, setDisplayName, setModelErrorHandler, setPersistent, setSource, sortContainedObjects, toplevel, toString, uniqueName, validateSettables, workspace

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

parallelSchedule

public Parameter parallelSchedule

A Parameter representing whether a sequential or parallel schedule will be computed. This parameter must be a boolean. The default value is false BooleanToken.

pipelining

public Parameter pipelining

A Parameter representing whether a pipelined parallel execution will be performed. A pipelined execution only makes sense when parallel execution is true. This parameter must be a boolean. The default value is false BooleanToken.

parallelExecution

public Parameter parallelExecution

A Parameter representing whether a sequential or parallel execution will be performed. This parameter must be a boolean. The default value is false BooleanToken.

Constructor Detail

DistributedSDFDirector

public DistributedSDFDirector()
                       throws IllegalActionException,
                              NameDuplicationException

Construct a director in the default workspace with an empty string as its name. The director is added to the list of objects in the workspace. Increment the version number of the workspace. The DistributedSDFDirector will have a default scheduler of type DistributedSDFScheduler.

Throws:

IllegalActionException - If the name has a period in it, or the director is not compatible with the specified container.

NameDuplicationException - If the container already contains an entity with the specified name.

DistributedSDFDirector

public DistributedSDFDirector(Workspace workspace)
                       throws IllegalActionException,
                              NameDuplicationException

Construct a director in the workspace with an empty name. The director is added to the list of objects in the workspace. Increment the version number of the workspace. The DistributedSDFDirector will have a default scheduler of type DistributedSDFScheduler.

Parameters:

workspace - The workspace for this object.

Throws:

IllegalActionException - If the name has a period in it, or the director is not compatible with the specified container.

NameDuplicationException - If the container already contains an entity with the specified name.

DistributedSDFDirector

public DistributedSDFDirector(CompositeEntity container,
                              java.lang.String name)
                       throws IllegalActionException,
                              NameDuplicationException

Construct a director in the given container with the given name. The container argument must not be null, or a NullPointerException will be thrown. If the name argument is null, then the name is set to the empty string. Increment the version number of the workspace. The DistributedSDFDirector will have a default scheduler of type DistributedSDFScheduler.

Parameters:

container - Container of the director.

name - Name of this director.

Throws:

IllegalActionException - If the director is not compatible with the specified container. May be thrown in a derived class.

NameDuplicationException - If the container is not a CompositeActor and the name collides with an entity in the container.

Method Detail

attributeChanged

public void attributeChanged(Attribute attribute)
                      throws IllegalActionException

React to a change in an attribute. If the changed attribute matches a parameter of the director, then the corresponding local copy of the parameter value will be updated. If the attribute that changes is parallelSchedule the schedule is invalidated.

Overrides:

attributeChanged in class SDFDirector

Parameters:

attribute - The changed parameter.

Throws:

IllegalActionException - If the parameter set is not valid.

fire

public void fire()
          throws IllegalActionException

Calculate the current schedule, if necessary, and iterate the contained actors in the order given by the schedule. Depending on the value of parallelSchedule either a sequential or a parallel schedule will be computed. Depending on the value of parallelExecution either a sequential or a parallel execution of the schedule will be computed. No internal state of the director is updated during fire, so it may be used with domains that require this property, such as CT.

Iterating an actor involves calling the actor's iterate() method, which is equivalent to calling the actor's prefire(), fire() and postfire() methods in succession. If iterate() returns NOT_READY, indicating that the actor is not ready to execute, then an IllegalActionException will be thrown. The values returned from iterate() are recorded and are used to determine the value that postfire() will return at the end of the director's iteration.

This method may be overridden by some domains to perform additional domain-specific operations.

Specified by:

fire in interface Executable

Overrides:

fire in class StaticSchedulingDirector

Throws:

IllegalActionException - If any actor executed by this actor return false in prefire.

initialize

public void initialize()
                throws IllegalActionException

Initialize the actors associated with this director (super). If parallelExecution is true, the infrastructure for a distributed execution is initialized. Once the required number of services are discovered, the actors are mapped on to them, sent to the distributed services and virtually connected over the network.

Specified by:

initialize in interface Executable

Overrides:

initialize in class SDFDirector

Throws:

IllegalActionException - If the initialize() method of one of the associated actors throws it, or if there is no scheduler.

newReceiver

public Receiver newReceiver()

Return a new receiver consistent with the Distributed-SDF domain.

Overrides:

newReceiver in class SDFDirector

Returns:

A new DistributedSDFReceiver.

preinitialize

public void preinitialize()
                   throws IllegalActionException

Preinitialize the actors associated with this director and compute the schedule (super). The schedule is computed during preinitialization so that hierarchical opaque composite actors can be scheduled properly, since the act of computing the schedule sets the rate parameters of the external ports. In addition, performing scheduling during preinitialization enables it to be present during code generation. The order in which the actors are preinitialized is arbitrary. The schedule computed will be either sequential or parallel depending on the value of parallelSchedule.

Specified by:

preinitialize in interface Executable

Overrides:

preinitialize in class SDFDirector

Throws:

IllegalActionException - If the preinitialize() method of one of the associated actors throws it.

wrapup

public void wrapup()
            throws IllegalActionException

Invoke the wrapup() method of all the actors contained in the director's container (super). In case of parallelExecution being true, exit from all the client threads is performed. This method should be invoked once per execution. None of the other action methods should be invoked after it in the execution. This method is not synchronized on the workspace, so the caller should be.

Specified by:

wrapup in interface Executable

Overrides:

wrapup in class Director

Throws:

IllegalActionException - If the wrapup() method of one of the associated actors throws it.

See Also:

ClientThread