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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-3731) Improve calculation of refSize in ClassSize.java
Date Fri, 27 Feb 2009 11:33:12 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-3731-3a-doc_changes.diff

Patch 3a adds the two properties to the examples for the basic security policy and the custom
security policy. In addition, the properties are described.

The following pages have been changed:
[1] http://db.apache.org/derby/docs/dev/adminguide/adminguide-single.html#tadminnetservrun
(examples)
[2] http://db.apache.org/derby/docs/dev/devguide/cdevbabejgjd.html (description)

I'm not sure if the right level of detail has been used.
Patch ready for 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
>    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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