On Wed, 3 Apr 2024 10:04:36 GMT, Alan Bateman <al...@openjdk.org> wrote:
> This change drops the adjustments to the virtual thread scheduler's target > parallelism when virtual threads do file operations on files that are opened > for buffered I/O. These operations are usually just too short to have any > benefit and may have a negative benefit when reading/writing a small number > of bytes. There is no change for read/write operations on files opened for > direct I/O or when writing to files that are opened with options for > synchronized I/O file integrity (O_SYNC/O_DSYNC and equivalents). Sergery > Kuksenko is polishing benchmarks that includes this area, this is for a > future PR. > > In addition, the blocker mechanism is updated to handle reentrancy (as can > happen if debugging code is added to ForkJoinPool) and preemption when > compensating (as can happen when substituting a heap buffer with a direct > buffer in some I/O operations). This part is a pre-requisite to the changes > to better support object monitor there are more places where preemption is > possible and this quickly leads to unbalanced begin/end. > > The changes have been baking in loom repo for some time. This pull request has now been integrated. Changeset: 412e306d Author: Alan Bateman <al...@openjdk.org> URL: https://git.openjdk.org/jdk/commit/412e306d81209c05f55aee7663f7abb80286e361 Stats: 1084 lines in 28 files changed: 215 ins; 624 del; 245 mod 8329593: Drop adjustments to target parallelism when virtual threads do I/O on files opened for buffered I/O Reviewed-by: bpb, jpai ------------- PR: https://git.openjdk.org/jdk/pull/18598
