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From "Daniel John Debrunner (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2904) Investigate the performance effect of adding an index to the Derby jar files (derby.jar, etc.)
Date Sat, 07 Jul 2007 18:03:04 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12510912

Daniel John Debrunner commented on DERBY-2904:

Yes, it can easily enabled using ant's jar target.

> Investigate the performance effect of adding an index to the Derby jar files (derby.jar,
> ----------------------------------------------------------------------------------------------
>                 Key: DERBY-2904
>                 URL: https://issues.apache.org/jira/browse/DERBY-2904
>             Project: Derby
>          Issue Type: Improvement
>          Components: Performance
>            Reporter: Daniel John Debrunner
>            Priority: Minor
> Since JDK 1.3 the Java jar format has supported an index to speed up class loading. Sounds
like it would be useful for derby's jar file, especially derby.jar with its many classes.
The ant jar target has an index attribute to enabled the index.
> Would be interesting to see the performance benefit and the increased size of the jar
> As a thought for a performance test, a simple test that loaded Derby in separate class
loaders, opened an existing database and executed a query to load as many classes as possible.
>  for (number of iterations)
>  {
>     create new class loader
>     load derby in class loader
>     boot database
>     prepare query
>     shutdown derby
> }
> Then time with a reasonable number of iterations. (I think 1 is too few, hence the use
of a class loader).

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