[jira] Commented: (HARMONY-5844) [drlvm] class unloading wastes memory

["Chunrong Lai (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HARMONY-5844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12601988#action_12601988 ] 

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


   Thanks. I could also observe OOM like "Cannot allocate pool storage: 00040000 bytes of virtual memory for code or data".
    My understanding is that the OOM probably comes from the test suite itself instead of from the class unloading. I did read the source code and see org.apache.harmony.vm.test.lazyresolution.StressTest 
is very memory consuming. At the same time one can turn off class unloading with option "-XX:gc.ignore_vtable_tracing=true" and still observe the memory increasing. I also see the memory consumption drops back to a normal number after the lazy.Stress.test passes (it can sometimes pass in batch-mode running but never pass in the standalone running with enhanced input parameters).
    Please let me know if I misunderstand the issue.

> [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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