On Thu, 10 Feb 2022 04:30:34 GMT, Tagir F. Valeev <[email protected]> wrote:
>> See the bug description for details. >> >> I propose a simple solution. Let's allow ArraySpliterator to be non-SIZED >> and report artificial estimatedSize(), much bigger than the real one. This >> will allow AbstractSpliterator and IteratorSpliterator to produce prefix >> whose size is comparable to Long.MAX_VALUE (say, starting with >> Long.MAX_VALUE/2), and this will enable further splitting of the prefix. >> This change will drastically improve parallel streaming for affected streams >> of size <= 1024 and significantly improve for streams of size 1025..20000. >> The cost is higher-grained splitting for huge streams of unknown size. This >> might add a minor overhead for such scenarios which, I believe, is >> completely tolerable. >> >> No public API changes are necessary, sequential processing should not be >> affected, except an extra field in ArraySpliterator which increases a >> footprint by 8 bytes. >> >> I added a simple test using an artificial collector to ensure that at least >> two non-empty parts are created when parallelizing Stream.iterate source. >> More testing ideas are welcome. > > Tagir F. Valeev has updated the pull request incrementally with two > additional commits since the last revision: > > - Update copyright year > - Cosmetic fixes A gentle ping :-) ------------- PR: https://git.openjdk.java.net/jdk/pull/7279
