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From "Dmitry Pronichkin (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HARMONY-5708) [drlvm][jit][opt] h3584 causes performance degradation on specjbb2005
Date Fri, 11 Apr 2008 11:53:05 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-5708?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dmitry Pronichkin updated HARMONY-5708:
---------------------------------------

    Attachment: acp.patch

Here's the patch correcting arraycopy usage.
The problem was in non-optimal choosing of direct/reverse method. When destPos > srcPos
we are using reverse copying method while we could use direct method when arrays are different.

> [drlvm][jit][opt] h3584 causes performance degradation on specjbb2005
> ---------------------------------------------------------------------
>
>                 Key: HARMONY-5708
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5708
>             Project: Harmony
>          Issue Type: Bug
>         Environment: win32
>            Reporter: Rustem Rafikov
>            Assignee: Mikhail Fursov
>         Attachments: acp.patch
>
>
> Hi All, 
> We got ~2% performance degradation after committing H3584 on SPECjbb2005.
> It was measured on tigerton, 8-vm configuration.

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