John O'Hara created JBJCA-1305: ---------------------------------- Summary: 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 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. -- This message was sent by Atlassian JIRA (v6.4.11#64026)