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From "Pavel Afremov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-3906) [drlvm][gc]Significant performance degradation after switch on GC v5
Date Fri, 18 May 2007 11:18:16 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-3906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12496839
] 

Pavel Afremov commented on HARMONY-3906:
----------------------------------------

I have this affect on Windows x86-32, Windows  x86-64, Linux x86-32 and Linux x86-32.

> [drlvm][gc]Significant performance degradation after switch on GC v5
> --------------------------------------------------------------------
>
>                 Key: HARMONY-3906
>                 URL: https://issues.apache.org/jira/browse/HARMONY-3906
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>            Reporter: Pavel Afremov
>         Assigned To: Xiao-Feng Li
>         Attachments: ExceptionsWeakRefBenchmark.java
>
>
> I found out significant performance degradation of class unloading support after switch
on GC v5. On 1 processor machine performance degradation in micro benchmark from HARMONY-3845
 can reach 10 times, on 4 HT processors degradation reaches up 80 times. It is 1000% and 8000%
correspondently!
>  I developed additional benchmark, which shows this problem without any changes in VM.
You can find it in attachment.
>  Of cause it's a synthetic benchmark. I didn't find any performance issues on specJVM
and specJBB.

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