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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-3731) Improve calculation of refSize in ClassSize.java
Date Wed, 23 Jul 2008 13:25:31 GMT

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

Kristian Waagan updated DERBY-3731:
-----------------------------------

    Attachment: derby-3731-1b-refsize_from_properties.stat
                derby-3731-1b-refsize_from_properties.diff

Patch 1b addresses the suggestions from Knut Anders and it adds permissions for the two system
properties to the default server policy file and the testing policy file.

Documentation must be added later.
Patch ready for another review.

> 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
>            Assignee: Kristian Waagan
>            Priority: Minor
>         Attachments: derby-3731-1a-refsize_from_properties.diff, derby-3731-1b-refsize_from_properties.diff,
derby-3731-1b-refsize_from_properties.stat, 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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