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From "Chunrong Lai (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-5844) [drlvm] class unloading wastes memory
Date Tue, 17 Feb 2009 14:20:59 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-5844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12674220#action_12674220
] 

Chunrong Lai commented on HARMONY-5844:
---------------------------------------


 hi, Pavel:
       See HARMONY-3997 we have stackClass[] associated with an exception. In this way an
exception connects to its stack frame as well as the methods/classes.  So I can observe that
exception prevents the UserClassLoader be unloaded.
       I am seeking more test cases to see if we need to extend the class registry implementation
to include the static object fields instead of simply treating them as string roots.

> [drlvm] class unloading wastes memory
> -------------------------------------
>
>                 Key: HARMONY-5844
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5844
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>            Reporter: Alexey Varlamov
>            Assignee: Chunrong Lai
>
> Simple class unloading scenario shows that DRLVM leaks memory (and finally crashes).
To reproduce, run StressTest of lazy.test suite and watch that process gradually consumes
more and more memory. If compared to RI, the last keeps memory flat during very long runs.
> Memory leaks roughly in the same rate for any execution mode, compiled or interpreted.
> For convenience, there is standalone launcher org.apache.harmony.vm.test.lazyresolution.StressTest
which can vary stress load, e.g.: 
> working_vm$ cd build\windows_x86_msvc_release\tests\lazy.tests\classes 
> classes$ java -cp .;junit.jar -Dlazy.test.iterations=100 -Dlazy.test.threads=10 org.apache.harmony.vm.test.lazyresolution.StressTest

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