Le lun. 27 févr. 2023 à 18:38, Mark Thomas <ma...@apache.org> a écrit :
> On 27/02/2023 17:09, Romain Manni-Bucau wrote: > > Hi, > > > > AFAIK loom or a standard thread pool are exactly the same except when you > > use loom you need to ensure you pass the contextual executor to use > > (scheduler in the API IIRC) otherwise the Thread.startVirtualThread will > > use the global JVM one (so you use 2 thread pools which is unintended in > > general and for tomcat which is multi-webapp can be an issue in some > > contexts). > > So overall the main benefit is to enable to use the contextual thread > pool > > owner to execute any banalized task. > > This is a great advantage and shouldnt touch other applications (which > > stays in a thread pool executor) so it sounds hurtless to auto switch to > > loom when possible. > > > > However it means you do not use LoomExecutor but a configured loom > executor > > (default works while only using loom friendly and not blocking code but > as > > soon as you will break that statement it will not work anymore). > > Ideally it means using java/lang/ThreadBuilders(Executor) to configure it > > and pass a standard executor to it. > > > > Hope it makes sense. > > Not really, no. There is no thread pool with Loom. > There is an implicit default fork join pool, see https://github.com/openjdk/loom/blob/e9f05191c306b2af9d91397f8a5bfffd948e6d69/src/java.base/share/classes/java/lang/VirtualThread.java#L1081 . It defaults to the number of proc. Max is 256 and min number of proc/2. Similarly there is a scheduled pool of 1 by default for background tasks. So using loom without caution is using a JVM (with its classloader side effect) thread pool which is enabled for JVM continuations, nothing more. > > Mark > > > > > > Romain Manni-Bucau > > @rmannibucau <https://twitter.com/rmannibucau> | Blog > > <https://rmannibucau.metawerx.net/> | Old Blog > > <http://rmannibucau.wordpress.com> | Github < > https://github.com/rmannibucau> | > > LinkedIn <https://www.linkedin.com/in/rmannibucau> | Book > > < > https://www.packtpub.com/application-development/java-ee-8-high-performance > > > > > > > > Le lun. 27 févr. 2023 à 17:53, Mark Thomas <ma...@apache.org> a écrit : > > > >> FYI > >> > >> https://spring.io/blog/2023/02/27/web-applications-and-project-loom > >> > >> Written for $dayjob but the data is based purely on Tomcat and a trivial > >> web application. > >> > >> I think this could prove useful when we need discuss what to do with the > >> Loom module code. > >> > >> Mark > >> > >> --------------------------------------------------------------------- > >> To unsubscribe, e-mail: dev-unsubscr...@tomcat.apache.org > >> For additional commands, e-mail: dev-h...@tomcat.apache.org > >> > >> > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: dev-unsubscr...@tomcat.apache.org > For additional commands, e-mail: dev-h...@tomcat.apache.org > >
