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https://issues.apache.org/jira/browse/DERBY-2114?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dyre Tjeldvoll updated DERBY-2114:
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Attachment: derby-2114.currentsize.v1.stat
derby-2114.currentsize.v1.diff
Attaching a follow-up patch (derby-2114.currentsize.v1) which provides an
unsynchronized version of currentSize() which can be used inside synchronized
regions to avoid double synchronization.
> Let Clock embed a HashMap rather than inherit from Hashtable
> ------------------------------------------------------------
>
> Key: DERBY-2114
> URL: https://issues.apache.org/jira/browse/DERBY-2114
> Project: Derby
> Issue Type: Improvement
> Components: Performance
> Affects Versions: 10.2.1.6
> Reporter: Dyre Tjeldvoll
> Assigned To: Dyre Tjeldvoll
> Priority: Trivial
> Fix For: 10.3.0.0
>
> Attachments: derby-2114.currentsize.v1.diff,
> derby-2114.currentsize.v1.stat, derby-2114.v1.diff, derby-2114.v1.stat,
> derby-2114.v2.diff, derby-2114.v2.stat
>
>
> Clock currently inherits from Hashtable, but the use of Hashtable is really
> an implementation detail that would benefit from being hidden as private
> member. All access to the hashtable happens inside sychronized blocks so it
> is safe to substitute a HashMap. This change appears to trigger a small
> increase in throughput, as measured by the average TPS number obtained by
> running the select client from DERBY-1961 repeatedly.
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