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https://issues.apache.org/jira/browse/DERBY-3731?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kathey Marsden updated DERBY-3731:
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Attachment: DERBY-3731_diff.txt
Attached is an initial patch (DERBY-3731_diff.txt) for this issue that adds
the garbage collection before reading totalMemory() and freeMemory(). This I
would like to check into trunk and backport to 10.4 and 10.3. Any additional
changes for using os.arch can go in subsequent to this and probably should only
go into the trunk as they might destabilize query plan selection. Running tests
now.
> 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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