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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (DERBY-3731) Improve calculation of refSize in ClassSize.java
Date Wed, 18 Mar 2009 16:44:50 GMT

     [ 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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