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https://issues.apache.org/jira/browse/DERBY-3731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12681661#action_12681661
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Kristian Waagan commented on DERBY-3731:
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Committed patch 3a to trunk. This was only documentation updates.

Before resolving/closing this issue, we have to agree on whether to backport 
the latest fixes to 10.4 and/or 10.3.
The original fix was ported to both 10.4 and 10.3, however there was a request 
to not backport any other fixes to those branches. Is this request still 
standing?

I have committed a change of the policy files to 10.4, but neither the fix nor 
the documentation changes have been backported. If we don't backport, I think I 
will revert that change on the 10.4 branch for consistency.

> 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
>    Affects Versions: 10.5.0.0
>            Reporter: Kathey Marsden
>            Assignee: Kristian Waagan
>            Priority: Minor
>             Fix For: 10.4.2.1, 10.5.0.0
>
>         Attachments: derby-3731-1a-refsize_from_properties.diff, 
> derby-3731-1b-refsize_from_properties.diff, 
> derby-3731-1b-refsize_from_properties.stat, 
> derby-3731-1c-refsize_from_properties.diff, 
> derby-3731-2a_update_of_policy_template.diff, derby-3731-3a-doc_changes.diff, 
> 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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