From: Magnus Holm <judofyr@...>
Date: 2013-04-28T21:40:14+09:00
Subject: [ruby-core:54657] Re: [ruby-trunk - Feature #8339][Open] Introducing Geneartional Garbage Collection for CRuby/MRI

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On Sat, Apr 27, 2013 at 8:19 PM, ko1 (Koichi Sasada)
<redmine@ruby-lang.org>wrote:

> We Heroku Matz team developed a new generational mark&sweep garbage
> collection algorithm RGenGC for CRuby/MRI.
> (correctly speaking, it is generational marking algorithm)
>
> What goods are:
>
>   * Reduce marking time (yay!)
>   * My algorithm doesn't introduce any incompatibility into normal C-exts.
>   * Easy to development
>
> Please read more details in attached PDF file.
> Code is: https://github.com/ko1/ruby/tree/rgengc


 Great work!

Are instances of user-level Ruby classes (`class MyClass; end`) marked as
sunny by default as well? If not, would it be difficult?

Also, I notice that generation/wb are stored as flags on the object.
Wouldn't this undo the work of the new bitmap mark flag improvements in 2.0?

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<div dir=3D"ltr">On Sat, Apr 27, 2013 at 8:19 PM, ko1 (Koichi Sasada) <span=
 dir=3D"ltr">&lt;<a href=3D"mailto:redmine@ruby-lang.org" target=3D"_blank"=
>redmine@ruby-lang.org</a>&gt;</span> wrote:<div class=3D"gmail_extra"><div=
 class=3D"gmail_quote">

<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
We Heroku Matz team developed a new generational mark&amp;sweep garbage<br>
collection algorithm RGenGC for CRuby/MRI.<br>
(correctly speaking, it is generational marking algorithm)<br>
<br>
What goods are:<br>
<br>
=C2=A0 * Reduce marking time (yay!)<br>
=C2=A0 * My algorithm doesn&#39;t introduce any incompatibility into normal=
 C-exts.<br>
=C2=A0 * Easy to development<br>
<br>
Please read more details in attached PDF file.<br>
Code is: <a href=3D"https://github.com/ko1/ruby/tree/rgengc" target=3D"_bla=
nk">https://github.com/ko1/ruby/tree/rgengc</a></blockquote><div><br></div>=
<div style>=C2=A0Great work!</div><div style><br></div><div style>Are insta=
nces of user-level Ruby classes (`class MyClass; end`) marked as sunny by d=
efault as well? If not, would it be difficult?</div>

<div style><br></div><div style>Also, I notice that generation/wb are store=
d as flags on the object. Wouldn&#39;t this undo the work of the new bitmap=
 mark flag improvements in 2.0?</div></div><br></div></div>

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