[JBoss JIRA] (JBJCA-1305) Performance degradation using fair semaphores in heavily contended workloads
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[
https://issues.jboss.org/browse/JBJCA-1305?page=com.atlassian.jira.plugin...
]
Tom Jenkinson commented on JBJCA-1305:
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One scenario to consider would be where the same datasource is used for multiple
applications. In that case a server under heavy load may see certain applications not
making progress in an orderly manner.
Performance degradation using fair semaphores in heavily contended
workloads
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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.
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Tom Jenkinson (JIRA)