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From "Xiao-Feng Li (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HARMONY-1428) [DRLVM] first batch of files for GCv5, a trace-forward copying collector
Date Sun, 08 Oct 2006 10:04:21 GMT
     [ http://issues.apache.org/jira/browse/HARMONY-1428?page=all ]

Xiao-Feng Li updated HARMONY-1428:
----------------------------------

    Attachment: patch_for_multi_gc.txt

The submitted file patch_for_multi_gc.txt is a patch that enables DRLVM to support multiple
GCs' build. 

To apply the patch, step 1 is to enter the top level of drlvm, type
    patch -p0 < patch_for_multi_gc.txt

Step 2, the original directory of gc (gcv4.1) should be renamed to be gc_cc, and gcv5 be under
directory of gc_gen.

Then it's done. A user can build and run as before without noticing anything changed (gcv4.1
is still the default GC), but he can run gcv5 with option in command line:
   -Dvm.dlls=gc_gen.dll

Hopefull we will later submit another patch to use name gcv5.dll instead of gc_gen.dll, but
at the moment it is ok.

Thanks,
xiaofeng
   

> [DRLVM] first batch of files for GCv5, a trace-forward copying collector
> ------------------------------------------------------------------------
>
>                 Key: HARMONY-1428
>                 URL: http://issues.apache.org/jira/browse/HARMONY-1428
>             Project: Harmony
>          Issue Type: Improvement
>          Components: DRLVM
>         Environment: These files were only tested on Windows with VS.NET 2003.  
>            Reporter: Xiao-Feng Li
>         Assigned To: weldon washburn
>         Attachments: gc.xml, gc_v5.001.zip, GCv5-mc001.zip, gcv5-r0.10.zip, patch-for-GCv5_r0.10.txt,
patch_for_multi_gc.txt, patch_gcv5_for_SVN454061.txt
>
>
> This archive has a couple of files implementing an early version of a trace-forward copying
collector for GCv5. It's only a starter with very basic functionalities. It is a generational
GC reqiures write barrier implemented in JIT. It was tested with JET, and ran SPECJBB2000
and SPECJVM98.
> The algorithm is depth-first tracing of From-space, and forwarding live objects to To-space
(It can forward part of the From-space). The To-space has no real management except for the
accomodation of forwarded objects and large objects. So the To-space is going to be replaced
by a mark-compaction GC, and the large objects will be managed by a LOS GC. 
> In order to minimize the changes to other components of DRLVM, the codes here comply
with the original contract between GCv4 and other components. I also borrowed some routine
code from GCv4 to avoid repetitive labor work.
> GCv5 is under active development, so please expect quick and big changes to this submitted
code base. I will submit new codes from time to time when they are worth a submission. Any
comments or codes are more than welcome. 

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