On Tue, 7 May 2024 22:50:18 GMT, Doug Lea <d...@openjdk.org> wrote: > This set of changes address causes of poor utilization with small numbers of > cores due to overly aggressive contention avoidance. A number of further > adjustments were needed to still avoid most contention effects in deployments > with large numbers of cores
src/java.base/share/classes/java/util/concurrent/ForkJoinPool.java line 978: > 976: * of two, at least 2. See above. > 977: */ > 978: static final int INITIAL_QUEUE_CAPACITY = 1 << 7; @DougLea Interesting change—what impact did you notice when doubling this? src/java.base/share/classes/java/util/concurrent/ForkJoinPool.java line 994: > 992: static final long SHUTDOWN = 1L << 1; // terminate when > quiescent > 993: static final long TERMINATED = 1L << 2; // only set if STOP > also set > 994: static final long RS_LOCK = 1L << 3; // lowest seqlock bit @DougLea I presume making these longs was to enable the int-field padding? ------------- PR Review Comment: https://git.openjdk.org/jdk/pull/19131#discussion_r1596382962 PR Review Comment: https://git.openjdk.org/jdk/pull/19131#discussion_r1596383529
