[jboss-jira] [JBoss JIRA] (JBJCA-1127) Contention fix when returning connections

[Ståle Pedersen (JIRA)]

Ståle Pedersen created JBJCA-1127:
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             Summary: Contention fix when returning connections
                 Key: JBJCA-1127
                 URL: https://issues.jboss.org/browse/JBJCA-1127
             Project: IronJacamar
          Issue Type: Enhancement
          Components: Performance
    Affects Versions: 1.1.2.Final, 1.0.23.Final
            Reporter: Ståle Pedersen
            Assignee: Jesper Pedersen
             Fix For: 1.0.24.Final, 1.1.3.Final


During benchmarking we saw a lot of contention when hibernate is returning connections.
With this fix below the total contention time (aggregated across all threads) over a 5min period in s/state for that lock in SemaphoreArrayListManagedConnectionPool has gone from 39min 55s to 17s.
https://github.com/johnaoahra80/ironjacamar/commit/f32885818bc0048522a0865dd89e98719853c74f
We havent seen any errors with this change in the IJ testsuite or in the benchmark we're running.

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