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Date: Sat, 29 Mar 2008 22:19:32 +0530
From: "Senaka Fernando" <senakafdo@gmail.com>
To: dev@harmony.apache.org
Subject: Re: GSOC 2008: harmony-gc-5
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Hi Xaio-Feng,

I was reading into gc_gen. Actually it seems that you are referring to an
archived gc, I believe you meant gc_v4 here, isn't it?

Alexei,

sorry I mistook the name.

Regards,
Senaka

On Sat, Mar 29, 2008 at 10:17 PM, Senaka Fernando <senakafdo@gmail.com>
wrote:

> Hi Alexei,
>
> I was reading into gc_gen. Actually it seems that you are referring to an
> archived gc, I believe you meant gc_v4 here, isn't it?
>
> Regards,
> Senaka
>
>
> On Sat, Mar 29, 2008 at 7:48 PM, Xiao-Feng Li <xiaofeng.li@gmail.com>
> wrote:
>
> > On Fri, Mar 28, 2008 at 7:16 PM, Senaka Fernando <senakafdo@gmail.com>
> > wrote:
> > > Hi Alexei,
> > >
> > >  Thanks.
> > >
> > >  Regards,
> > >  Senaka
> > >
> >
> > Hi, Senaka, I am catching up the emails. The discussions below were
> > interesting. You can take the mark-sweep GC of Harmony as the starting
> > point. It's a parallel GC, and can optional compact the heap under
> > serious heap fragmentation. You are encouraged to apply for the
> > project. There could be multiple applicants though...
> >
> > Thanks,
> > xiaofeng
> >
> > >  On Fri, Mar 28, 2008 at 3:24 PM, Alexei Fedotov <
> > alexei.fedotov@gmail.com>
> > >
> > >
> > > wrote:
> > >
> > >  > Senaka,
> > >  > Thanks for your enthusiasm and good luck.
> > >  >
> > >  > It turns out that Xiao Feng is silent due to his vacations. I've
> > asked
> > >  > a guy who works with him to remind him about official mentor
> > >  > registration. Hope he either is already registered or will do it
> > soon.
> > >  >
> > >  > Thanks.
> > >  >
> > >  > On Fri, Mar 28, 2008 at 10:39 AM, Senaka Fernando <
> > senakafdo@gmail.com>
> > >  > wrote:
> > >  > > Hi Alexei,
> > >  > >
> > >  > >
> > >  > >  On Fri, Mar 28, 2008 at 3:15 AM, Alexei Fedotov <
> > >  > alexei.fedotov@gmail.com>
> > >  > >  wrote:
> > >  > >
> > >  > >
> > >  > >  > Parrot community have a pretty interesting and resourceful
> > test base
> > >  > >  > including tests which run regular expressions against their
> > code
> > >  > which
> > >  > >  > fail when the code style is not good. The only stress test
> > they have
> > >  > >  > is fortunately a test against GC [1], so it may be a good
> > start.
> > >  > >  > Generally this would be a good idea to address these questions
> > to
> > >  > >  > their list and ask them for cross-mentoring. Building good
> > relations
> > >  > >  > and understanding their code of conduct would ease acceptance
> > of your
> > >  > >  > work later.
> > >  > >
> > >  > >
> > >  > >  +1, for the thought. I will start this discussion on their list,
> > too.
> > >  > >
> > >  > >
> > >  > >
> > >  > >  >
> > >  > >  > As for the porting layer, Maria tried merging Harmony and
> > Parrot
> > >  > >  > porting layers and faced difficulties adjusting our hythread
> > layer
> > >  > >  > based on port layer based on apr layer based on OS layer to
> > parrot
> > >  > >
> > >  > >
> > >  > >  I'm familiar with apr source so I can use it as a base from
> > which i
> > >  > >  investigate the port layer. I believe that a ground-up approach
> > could
> > >  > rather
> > >  > >  be appealing.
> > >  > >
> > >  > >
> > >  > >
> > >  > >  >
> > >  > >  > based on source configure-like preprocessing. Another
> > challenge is a
> > >  > >  > pure C nature of Parrot code which makes embedding our sources
> > >  > tainted
> > >  > >  > with C++ painful. For me it seems feasible to build GC into a
> > >  > separate
> > >  > >
> > >  > >
> > >  > >  There is the possibility of Class Loading to solve this issue.
> > This
> > >  > requires
> > >  > >  defining an exportable C interface so that Parrot wouldn't need
> > to
> > >  > bother
> > >  > >  about the Harmony source.
> > >  > >
> > >  > >
> > >  > >
> > >  > >  >
> > >  > >  > dynamic library using Harmony build system, and plug it into
> > Parrot
> > >  > >  > using a binary DLL interface you have to tune.
> > >  > >
> > >  > >
> > >  > >  I'm interested in taking this project. This sounds very
> > interesting.
> > >  > >
> > >  > >
> > >  > >
> > >  > >
> > >  > >  >
> > >  > >  >
> > >  > >  > [1] parrot/t/stress/gc.t
> > >  > >  >
> > >  > >  > On Thu, Mar 27, 2008 at 11:21 PM, Senaka Fernando <
> > >  > senakafdo@gmail.com>
> > >  > >  > wrote:
> > >  > >  > > Hi Alexei,
> > >  > >  > >
> > >  > >  > >  On Fri, Mar 28, 2008 at 1:17 AM, Alexei Fedotov <
> > >  > >  > alexei.fedotov@gmail.com>
> > >  > >  > >  wrote:
> > >  > >  > >
> > >  > >  > >  > Hello Senaka,
> > >  > >  > >
> > >  > >  > >
> > >  > >  > >  Thanks for the prompt reply.
> > >  > >  > >
> > >  > >  > >
> > >  > >  > >  >
> > >  > >  > >  > Welcome to the community. If I would set expectations for
> > >  > >  > >  > harmony-gc-5, I would suggest that Parrot VM test base
> > passes on
> > >  > >  > >  > Parrot with XFL garbage collector plugged in.
> > >  > >  > >
> > >  > >  > >
> > >  > >  > >  Since there is a test base I believe I that it would be
> > much
> > >  > easier to
> > >  > >  > track
> > >  > >  > >  the flow of my work and understand the expectation. Do you
> > believe
> > >  > that
> > >  > >  > the
> > >  > >  > >  Parrot VM test base would cover all the necessary
> > requirements so
> > >  > that
> > >  > >  > I can
> > >  > >  > >  take a look of what is expected?
> > >  > >  > >
> > >  > >  > >  Also, I would like to know whether there are any JIRA
> > issues, test
> > >  > >  > branches,
> > >  > >  > >  etc. or any similar initiatives that you've taken regarding
> > this
> > >  > >  > feature.
> > >  > >  > >
> > >  > >  > >
> > >  > >  > >
> > >  > >  > >  > This includes subtasks
> > >  > >  > >  > such as unplugging Harmony GC from DRLVM, adjusting GC
> > interface
> > >  > and
> > >  > >  > >  > code to work with object layout coded in Parrot PMCs*
> > instead of
> > >  > >  > >  > layouts accessed via java object virtual tables and
> > resolving
> > >  > porting
> > >  > >  > >  > layer and linking conflicts.
> > >  > >  > >
> > >  > >  > >
> > >  > >  > >  I can rather target these tasks as objectives. Btw, what
> > typically
> > >  > >  > >  constitutes the porting layer?
> > >  > >  > >
> > >  > >  > >
> > >  > >  > >
> > >  > >  > >  >
> > >  > >  > >  >
> > >  > >  > >  > Thank you for your interest!
> > >  > >  > >  >
> > >  > >  > >  > * Which are very different from Apache PMCs.
> > >  > >  > >
> > >  > >  > >
> > >  > >  > >  :)
> > >  > >  > >
> > >  > >  > >  Regards,
> > >  > >  > >  Senaka
> > >  > >  > >
> > >  > >  > >
> > >  > >  > >
> > >  > >  > >
> > >  > >  > >  >
> > >  > >  > >  > On Thu, Mar 27, 2008 at 9:55 PM, Senaka Fernando <
> > >  > senakafdo@gmail.com
> > >  > >  > >
> > >  > >  > >  > wrote:
> > >  > >  > >  > > Hi Xiaofeng,
> > >  > >  > >  > >
> > >  > >  > >  > >  I'm a 3rd year university student with a C/C++
> > background and
> > >  > also
> > >  > >  > a
> > >  > >  > >  > >  reasonable amount of knowledge in Perl and Java. I'm
> > >  > interested in
> > >  > >  > >  > working
> > >  > >  > >  > >  on the "*Build a garbage collector for C/C++ programs
> > on the
> > >  > top
> > >  > >  > of
> > >  > >  > >  > Harmony"
> > >  > >  > >  > >  project (harmony-gc-5). I would like to know your
> > >  > expectations
> > >  > >  > >  > regarding
> > >  > >  > >  > >  this.
> > >  > >  > >  > >
> > >  > >  > >  > >  I have read through the Markmail archives of the
> > Harmony dev
> > >  > list,
> > >  > >  > and
> > >  > >  > >  > also
> > >  > >  > >  > >  the discussion at [1]. And, would like to know a bit
> > more on
> > >  > this
> > >  > >  > >  > project.
> > >  > >  > >  > >
> > >  > >  > >  > >  [1]
> > >  > http://www.perl6.org/perl6-internals/2007-10/msg00091.html
> > >  > >  > >  > >
> > >  > >  > >  > >  Thanks,
> > >  > >  > >  > >
> > >  > >  > >  > >  Senaka Fernando,
> > >  > >  > >  > >  Dept. of Computer Science & Engineering,
> > >  > >  > >  > >  University of Moratuwa,
> > >  > >  > >  > >  Sri Lanka
> > >  > >  > >  > >  *
> > >  > >  > >  > >
> > >  > >  > >  >
> > >  > >  > >  >
> > >  > >  > >  >
> > >  > >  > >  > --
> > >  > >  > >  > With best regards,
> > >  > >  > >  > Alexei
> > >  > >  > >  >
> > >  > >  > >
> > >  > >  >
> > >  > >  >
> > >  > >  >
> > >  > >  > --
> > >  > >  > With best regards,
> > >  > >  > Alexei
> > >  > >  >
> > >  > >
> > >  >
> > >  >
> > >  >
> > >  > --
> > >  > With best regards,
> > >  > Alexei
> > >  >
> > >
> >
> >
> >
> > --
> > http://xiao-feng.blogspot.com
> >
>
>

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