RFR 8190974 Parallel stream execution within a custom ForkJoinPool should obey the parallelism

Tagir Valeev amaembo at gmail.com
Fri Nov 10 13:01:08 UTC 2017


Looks good to me, thanks!

With best regards,
Tagir Valeev.

9 нояб. 2017 г. 4:02 AM пользователь "Paul Sandoz" <paul.sandoz at oracle.com>

> Hi,
> Please review this patch to ensure that a parallel stream obeys the
> parallelism of a custom fork join pool when it is executed within that pool:
>   http://cr.openjdk.java.net/~psandoz/jdk10/JDK-8190974-par-
> stream-custom-pool/webrev/ <http://cr.openjdk.java.net/~
> psandoz/jdk10/JDK-8190974-par-stream-custom-pool/webrev/>
> Streams currently do not support capabilities to control the level of
> parallelism and therefore resources utilised (tricky API design problem to
> get right).
> At the moment the trick is to run stream executions within a custom pool,
> however the number of fork join tasks created will be in proportion to the
> parallelism of the common pool thus the execution will be over-provisioned.
> This can be especially noticeable on large machines with many cores.
> Paul.

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