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https://issues.apache.org/jira/browse/OPENJPA-2353?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rick Curtis resolved OPENJPA-2353.
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Resolution: Fixed
Fix Version/s: 2.3.0
> Reduce object allocations
> -------------------------
>
> Key: OPENJPA-2353
> URL: https://issues.apache.org/jira/browse/OPENJPA-2353
> Project: OpenJPA
> Issue Type: Improvement
> Components: kernel, performance
> Affects Versions: 2.3.0, 2.2.2
> Reporter: Rick Curtis
> Assignee: Rick Curtis
> Priority: Minor
> Fix For: 2.3.0, 2.2.2
>
>
> While trolling through some object allocation profiles I found two places
> that we can greatly reduce object allocations for most applications.
> The first is in BrokerImpl.initializeOperatingSet(). In this method we ALWAYS
> create a new IdentityMap, regardless of whether we use it or not. This map is
> used for cascading operations and isn't used otherwise.
> The second improvement comes in when initializing a new Entity. During
> loading of an Entity, we will allocation three BitSets, one to keep track of
> clean fields, one for dirty, and another for flushed fields. In the event
> that we don't dirty / flush anything for a given Entity the dirty and flushed
> BitSets are a waste.
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