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https://issues.apache.org/jira/browse/DERBY-3731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12611342#action_12611342
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Kathey Marsden commented on DERBY-3731:
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ported fix to do gc before memory estimation to 10.4 and 10.3. Leaving the
issue open for possible other improvements.
> Improve calculation of refSize in ClassSize.java
> -------------------------------------------------
>
> Key: DERBY-3731
> URL: https://issues.apache.org/jira/browse/DERBY-3731
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Reporter: Kathey Marsden
> Priority: Minor
> Attachments: DERBY-3731_diff.txt
>
>
> java/engine/org/apache/derby/iapi/services/cache/ClassSize.java has a static
> code block which calculates the size of a reference for the architecture.
> This code could be improved by adding garbage collection before measuring
> memory, to give a consistent reading. Also there have been suggestions
> that we use os.arch or sun.arch.data.model to make the measurement more
> reliable, especially on 64bit machines.
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