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From "Weldon Washburn" <weldon...@gmail.com>
Subject Re: [DRLVM][GC] first batch of files for GCv5, a preliminary trace-forward copying collector
Date Mon, 11 Sep 2006 17:04:55 GMT
On 9/11/06, Xiao-Feng Li <xiaofeng.li@gmail.com> wrote:
> Hi, folks, to follow up the GCv5 proposal, I submitted the early files
> of a copying collector for GCv5. The idea is to develop GCv5 openly in
> Harmony, so that we can develop it togother. Any comments or
> improvements are welcome. The JIRA issue I created is HARMONY-1428 as
> the message below. It has no document associated, since it's too early
> and unstable for serious document efforts; but I think it is simple
> and concise enough for any people who are interested in GC
> development.

Good. I will take a look.  Thanks for the update.

> xiaofeng
> ---------- Forwarded message ----------
> From: Xiao-Feng Li (JIRA) <jira@apache.org>
> Date: Sep 11, 2006 11:20 PM
> Subject: [jira] Created: (HARMONY-1428) [DRLVM] first batch of files
> for GCv5, a trace-forward copying collector
> To: xiaofeng.li@gmail.com
> [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.NET2003.
>            Reporter: Xiao-Feng Li
> 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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Weldon Washburn
Intel Middleware Products Division

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