Message processing differences between fork-join-executor and thread-pool-executor?

[Jay Camp]

I'm trying to wrap my head around how a dispatcher based on fork-join is different than thread-pool. The way I understand it Fork/Join gives you the ability to recursively split up tasks into smaller and smaller pieces that then get recombined. How does this apply to Akka, where the units of work are defined by how long an onReceive method runs for? 

Maybe another way to ask this is how are messages processed differently under fork-join versus a thread-pool?

Thanks!

[Björn Antonsson]

Hi Jay,

On Wednesday, 10 April 2013 at 19:45, Jay Camp wrote:

I'm trying to wrap my head around how a dispatcher based on fork-join is different than thread-pool. The way I understand it Fork/Join gives you the ability to recursively split up tasks into smaller and smaller pieces that then get recombined. How does this apply to Akka, where the units of work are defined by how long an onReceive method runs for? 

In Akka, the unit of work is the processing of a message. There is no way to split the processing of a single message into smaller pieces automatically.

 

Maybe another way to ask this is how are messages processed differently under fork-join versus a thread-pool?

The messages themselves are not processed differently. As I said they're not split in any way.

Both the ForkJoinPool and ThreadPoolExecutor are executor services and in the way that Akka uses the ForkJoinPool, the biggest difference from the ThreadPoolExecutor is that the ForkJoinPool has multiple queues with work stealing, which scales much better than the single job queue of the ThreadPoolExecutor.

B/

Thanks!

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Björn Antonsson

Typesafe – The software stack for applications that scale

twitter: @bantonsson