[jira] Commented: (DERBY-2904) Investigate the performance effect of adding an index to the Derby jar files (derby.jar, etc.)

["Bryan Pendleton (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DERBY-2904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12510909 ] 

Bryan Pendleton commented on DERBY-2904:
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Hi Dan, is this the feature you're referring to?
http://java.sun.com/j2se/1.3/docs/guide/jar/jar.html#JAR%20Index


> Investigate the performance effect of adding an index to the Derby jar files (derby.jar, etc.)
> ----------------------------------------------------------------------------------------------
>
>                 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 files.
> 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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