[jira] Commented: (HARMONY-3906) [drlvm][gc]Significant performance degradation after switch on GC v5

["Xiao-Feng Li (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HARMONY-3906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12496817 ] 

Xiao-Feng Li commented on HARMONY-3906:
---------------------------------------

Pavel, what are the platform and configuration you are using for the measurement?

> [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
>         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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