On Thu, 14 Nov 2024 21:34:08 GMT, Larry Cable <d...@openjdk.org> wrote:
> c.f: > [https://bugs.openjdk.org/browse/JDK-8339420](https://bugs.openjdk.org/browse/JDK-8339420) > > Summary > ------- > > Add `jcmd <pid> Thread.vthread_summary` to print summary information that is > useful when trying to diagnose issues with virtual threads. > > > Problem > ------- > > The JDK is lacking tooling to diagnose issues with virtual threads. > > > Solution > -------- > > Add a new command that the `jcmd` command line tool can use to print > information about virtual threads. The output includes the virtual thread > scheduler, the schedulers used to support timeouts, and the I/O pollers used > to support virtual threads doing socket I/O, and a summary of the thread > groupings. > > Here is sample output. The output is intended for experts and is not intended > for automated parsing. > > > Virtual thread scheduler: > java.util.concurrent.ForkJoinPool@4a624db0[Running, parallelism = 16, size = > 2, active = 0, running = 0, steals = 2, tasks = 0, submissions = 0] > > Timeout schedulers: > [0] java.util.concurrent.ScheduledThreadPoolExecutor@1f17ae12[Running, pool > size = 0, active threads = 0, queued tasks = 0, completed tasks = 0] > [1] java.util.concurrent.ScheduledThreadPoolExecutor@6193b845[Running, pool > size = 1, active threads = 0, queued tasks = 1, completed tasks = 0] > [2] java.util.concurrent.ScheduledThreadPoolExecutor@c4437c4[Running, pool > size = 0, active threads = 0, queued tasks = 0, completed tasks = 0] > [3] java.util.concurrent.ScheduledThreadPoolExecutor@3f91beef[Running, pool > size = 0, active threads = 0, queued tasks = 0, completed tasks = 0] > > Read I/O pollers: > [0] sun.nio.ch.KQueuePoller@524bf25 [registered = 1] > > Write I/O pollers: > [0] sun.nio.ch.KQueuePoller@25c41da2 [registered = 0] > > Thread groupings: > <root> [platform threads = 11, virtual threads = 0] > java.util.concurrent.ScheduledThreadPoolExecutor@c4437c4 [platform threads = > 0, virtual threads = 0] > java.util.concurrent.ScheduledThreadPoolExecutor@3f91beef [platform threads = > 0, virtual threads = 0] > ForkJoinPool.commonPool/jdk.internal.vm.SharedThreadContainer@4fa374ea > [platform threads = 0, virtual threads = 0] > java.util.concurrent.ThreadPoolExecutor@506e1b77 [platform threads = 1, > virtual threads = 0] > java.util.concurrent.ScheduledThreadPoolExecutor@1f17ae12 [platform threads = > 0, virtual threads = 0] > java.util.concurrent.ThreadPerTaskExecutor@24155ffc [platform threads = 0, > virtual threads = 2] > ForkJoinPool-1/jdk.internal.vm.SharedThreadContainer@48a03463 [platform > threads = 2, virtual threads = 0] > java.util.concurrent.Scheduled... This pull request has been closed without being integrated. ------------- PR: https://git.openjdk.org/jdk/pull/22121
