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Dierk König Canoo Engineering AG Basel, Schweiz GPars Parallel programming concepts for the JVM in Groovy Jazoon 2.6.2010 Donnerstag, 10. Juni 2010
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
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Donnerstag, 10. Juni 2010
GPars mission
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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
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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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Further reading
gpars.codehaus.org
manning.com/koenig2
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Questions - and maybe some answers ...
Donnerstag, 10. Juni 2010
