[jira] Resolved: (DERBY-3731) Improve calculation of refSize in ClassSize.java

["Kristian Waagan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DERBY-3731?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kristian Waagan resolved DERBY-3731.
------------------------------------

    Resolution: Fixed
    Derby Info:   (was: [Patch Available])

Pulled out a commit on the 10.4 branch with revision 755636, since the rest of the changes won't be backported.

Note that the first patches contributed by Kathey did go into both 10.4 and 10.3, but the later patches did not.
This means that the fix version is slightly inaccurate.

I don't expect to do any more changes for this issue. Feel free to close the issue.

> 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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