Performance degradation using fair semaphores in heavily contended workloads ---------------------------------------------------------------------------- Key: JBJCA-1305 URL: https://issues.jboss.org/browse/JBJCA-1305 Project: IronJacamar Issue Type: Enhancement Components: Core Affects Versions: WildFly/IronJacamar 1.3.1.Final Reporter: John O'Hara Assignee: Jesper Pedersen Fix For: WildFly/IronJacamar 1.3.2.Final Under heavy contention, a fair semaphore causes performance degradation for threads trying to acquire a permit from the semaphore. Changing the semaphore to not fair alleviates the performance degradation under heavy contention.