Make number of thread size for ServerService Thread Pool configurable --------------------------------------------------------------------- Key: WFCORE-1934 URL: https://issues.jboss.org/browse/WFCORE-1934 Project: WildFly Core Issue Type: Bug Components: Server Affects Versions: 2.2.0.Final Reporter: Masafumi Miura Assignee: Jason Greene Attachments: ServerServiceThreadPool_ejb_startup_singleton.zip, ServerServiceThreadPool_persistence_unit.zip Provide a way to configure {{maximumPoolSize}} of {{ServerService Thread Pool}}. It defaults to {{Integer.MAX_VALUE}} and it's unable to be changed in the current implementation: {quote} https://github.com/wildfly/wildfly-core/blob/master/server/src/main/java/... {code} 446 public synchronized void start(StartContext context) throws StartException { 447 executorService = new ThreadPoolExecutor(0, Integer.MAX_VALUE, 20L, TimeUnit.SECONDS, 448 new SynchronousQueue<Runnable>(), threadFactory); 449 } {code} {quote} Though the threads will disappear after 20 seconds of finishing a task, ulimit ({{nproc}}, max user processes) has a possibility to run out and "java.lang.OutOfMemoryError: unable to create new native thread" would occur depending on deployed applications. For example, an application coming with many {{<persistence-unit>}} entries in {{persistence.xml}} or a lot of @Startup @Singleton EJB can cause spawning a lot of {{ServerService Thread Pool}} thread. Even if ulimit can be configurable and it is recommended to be tuned in a production environment, making {{maximumPoolSize}} of {{ServerService Thread Pool}} configurable would be helpful.