On Mon, 12 Aug 2024 17:07:42 GMT, Doug Lea <d...@openjdk.org> wrote: > The Exchanger class uses spin-waits that are hostile to some uses of > VirtualThreads. Improving this requires a means of estimating whether there > are many VirtualThreads with few carriers, which can be supported by adding a > method in class ForkJoinWorkerThread. This enables a reworking of the > exchange method, and can also be used to deal with similar issues in > LinkedTransferQueue and possibly elsewhere. We leave for now open whether > this method (hasKnownQueuedWork) should be public, which would allow users to > use it in similar contexts, at the possible expense of revealing too much > about current VT implementation
The only applicable tests here are performance tests. I have several ad-hoc ones, but I'm not sure how useful they would be to place in openjdk repo. However, it occurred to me that sometime soon, a version of the whole j.u.c tck suite should be created to use virtual threads. Which would not be easy, but might uncover something surprising? ------------- PR Comment: https://git.openjdk.org/jdk/pull/20554#issuecomment-2299609454
