trait TaskSupport extends Tasks

A trait implementing the scheduling of a parallel collection operation.

Parallel collections are modular in the way operations are scheduled. Each parallel collection is parameterized with a task support object which is responsible for scheduling and load-balancing tasks to processors.

A task support object can be changed in a parallel collection after it has been created, but only during a quiescent period, i.e. while there are no concurrent invocations to parallel collection methods.

There are currently a few task support implementations available for parallel collections. The scala.collection.parallel.ForkJoinTaskSupport uses a fork-join pool internally.

The scala.collection.parallel.ExecutionContextTaskSupport uses the default execution context implementation found in scala.concurrent, and it reuses the thread pool used in scala.concurrent.

The execution context task support is set to each parallel collection by default, so parallel collections reuse the same fork-join pool as the future API.

Here is a way to change the task support of a parallel collection:

import scala.collection.parallel._
val pc = mutable.ParArray(1, 2, 3)
pc.tasksupport = new ForkJoinTaskSupport(
  new java.util.concurrent.ForkJoinPool(2))
See also

Configuring Parallel Collections section on the parallel collection's guide for more information.

Linear Supertypes
Tasks, AnyRef, Any
Known Subclasses
ExecutionContextTaskSupport, ForkJoinTaskSupport
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Type Members

  1. trait WrappedTask [R, +Tp] extends AnyRef
    Definition Classes
    Tasks

Abstract Value Members

  1. abstract val environment: AnyRef

    The type of the environment is more specific in the implementations.

    The type of the environment is more specific in the implementations.

    Definition Classes
    Tasks
  2. abstract def execute[R, Tp](fjtask: Task[R, Tp]): () ⇒ R

    Executes a task and returns a future.

    Executes a task and returns a future. Forwards an exception if some task threw it.

    Definition Classes
    Tasks
  3. abstract def executeAndWaitResult[R, Tp](task: Task[R, Tp]): R

    Executes a result task, waits for it to finish, then returns its result.

    Executes a result task, waits for it to finish, then returns its result. Forwards an exception if some task threw it.

    Definition Classes
    Tasks
  4. abstract def parallelismLevel: Int

    Retrieves the parallelism level of the task execution environment.

    Retrieves the parallelism level of the task execution environment.

    Definition Classes
    Tasks

Concrete Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
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  2. final def ##(): Int
    Definition Classes
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  6. final def eq(arg0: AnyRef): Boolean
    Definition Classes
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  7. def equals(arg0: Any): Boolean
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  8. def finalize(): Unit
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  9. final def getClass(): Class[_]
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  11. final def isInstanceOf[T0]: Boolean
    Definition Classes
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  12. final def ne(arg0: AnyRef): Boolean
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  13. final def notify(): Unit
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  14. final def notifyAll(): Unit
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  15. final def synchronized[T0](arg0: ⇒ T0): T0
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  17. final def wait(): Unit
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  18. final def wait(arg0: Long, arg1: Int): Unit
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  19. final def wait(arg0: Long): Unit
    Definition Classes
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Inherited from Tasks

Inherited from AnyRef

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