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From "weldon washburn (JIRA)" <j...@apache.org>
Subject [jira] Closed: (HARMONY-2945) [DRLVM][GCv5] parallel generational or non-generational collection
Date Thu, 11 Jan 2007 14:03:27 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-2945?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

weldon washburn closed HARMONY-2945.

    Resolution: Fixed

01....patch was committed.  The change to gc_platform.h for MAP_FIXED was applied manually.
 Passes on winxp and rhel4 w/ gcc 4.0.2

> [DRLVM][GCv5] parallel generational or non-generational collection
> ------------------------------------------------------------------
>                 Key: HARMONY-2945
>                 URL: https://issues.apache.org/jira/browse/HARMONY-2945
>             Project: Harmony
>          Issue Type: Improvement
>          Components: DRLVM
>         Environment: Windows and Linux IA32
>            Reporter: Xiao-Feng Li
>         Assigned To: weldon washburn
>         Attachments: 01-GCv5-parallelization-1-11.patch, 02-GCv5-parallelization-1-11.patch,
GCv5-parallelization-1-5-02.patch, GCv5-parallelization-1-5.patch
> Hi, attached is a patch for GCv5 which achieves good parallelization scalability in real
SMP machine. It can works in generational or nongenerational mode. I have tested it on a Intel
Tulsa platform which has four Pentium-D dual-core processors (totally 8 cores). It performs
pretty well. With more processors and larger heap size, this parallel GC can demonstrate more
> There are two dependences:
> 1. To fully exploit this GC's adavantage, helper inlining should be enabled for it. It
depends on Harmony-2652 which inlines write barrier. 
> 2. Some JIT optimizations do not implement write barrer for reference field update. These
opts have to be disabled to make the generational mode work.
> At the same time before the two dependences are resolved, people still can play with
it in non-generational mode. But the performance will be impacted seriously without helper
> Dear commiter, please help to integrate it into Harmony SVN. Please apply the patch at
working_vm directory.
> Thanks,
> xiaofeng

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