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Dierk KönigCanoo Engineering AG
Basel, Schweiz
GPars Parallel programming concepts for the JVM
in Groovy
Jazoon2.6.2010
Donnerstag, 10. Juni 2010
Welcome!Dierk KönigFellow @ Canoo Engineering AG, Basel (CH)
Canoo RIA SuiteProjects, Consultingwww.canoo.com
Open-source committer Groovy, Grails, GPars
Donnerstag, 10. Juni 2010
GPars mission
3
Donnerstag, 10. Juni 2010
GPars mission
3
Make concurrency simpler for the Java/Groovy programmer by giving access to new concepts.gpars.codehaus.org
Donnerstag, 10. Juni 2010
„New“ concepts
Fork/JoinMap/Filter/Reduce
DataflowAgentActor
Working on collections withpredefined coordination
Implicit coordinationDelegated coordinationExplicit coordination
Donnerstag, 10. Juni 2010
„New“ concepts
Fork/JoinMap/Filter/Reduce
DataflowAgentActor
CSPSTM
more
Working on collections withpredefined coordination
Implicit coordinationDelegated coordinationExplicit coordination
Donnerstag, 10. Juni 2010
„New“ concepts
Fork/JoinMap/Filter/Reduce
DataflowAgentActor
CSPSTM
more
DEMODEMO
DEMOSlideSlide
Donnerstag, 10. Juni 2010
„New“ concepts
Fork/JoinMap/Filter/Reduce
DataflowAgentActor
CSPSTM
DEMODEMO
DEMOSlideSlide
Donnerstag, 10. Juni 2010
Fork/Join vs Map/Filter/Reduce
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!
Donnerstag, 10. Juni 2010
Fork/Join vs Map/Filter/Reduce
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!
predefined coordination
Donnerstag, 10. Juni 2010
Concurrency enabling methods
any collect count each eachWithIndex every groupBy map split filter find findAll findAny grepreduce fold max min sum
makeTransparent parallel collection
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Donnerstag, 10. Juni 2010
DataFlow
Flavors: variables, streams, operators, tasks, flows
Write-Once, Read-Many (non-blocking)
Feel free to use millions of them
Fast, efficient, safe, and testable!
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Model the flow of data,
not the control flow!
Donnerstag, 10. Juni 2010
Explicit coordination with Actors
@Grab('org.codehaus.gpars:gpars:0.10')import static groovyx.gpars.actor.Actors.*
def decrypt = reactor { code -> code.reverse() }def audit = reactor { println it }
def main = actor { decrypt 'terces pot' react { plainText -> audit plainText }}main.join()audit.stop()audit.join()
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Donnerstag, 10. Juni 2010
Actors
Process one message at a time.
Dispatch on the message type, which fits nicely with dynamic languages.
Are often used in composition,which can lead to further problems down the road.
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Personal note:
Actors are overrated
Donnerstag, 10. Juni 2010
Delegate coordination to Agents
@Grab('org.codehaus.gpars:gpars:0.9')import groovyx.gpars.agent.Agent
def guard = new Agent<String>()
guard { updateValue 'GPars' }guard { updateValue(it + ' is groovy!') }
assert "GPars is groovy!" == guard.val
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Concurrency takeaways
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1 GPars makes it simple
Learn the concepts
Groovy/Java is ready
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3
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Further reading
gpars.codehaus.org
manning.com/koenig2
Donnerstag, 10. Juni 2010
Questions - and maybe some answers ...
Donnerstag, 10. Juni 2010
