From: Tony Arcieri <tony.arcieri@...>
Date: 2012-07-05T10:30:31+09:00
Subject: Re: Green threads in 1.9.* ?

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On Wed, Jul 4, 2012 at 3:57 AM, rex goxman <lists@ruby-forum.com> wrote:

> I'd like to use green threads (NOT kernel threads) in a Ruby program I'm
> writing. There is no reason for me to
> use kernel threads, and every reason to use green ones.
>

If you want to use 1.9, you're out of luck. That said, you aren't stating
your reasoning for why you would prefer green threads over native ones.

Native threads have a longer creation time and use marginally more memory
(they use ~20kB per thread last I measured), however they generally perform
better, particularly around I/O. On platforms like Linux scheduling is O(1)
so there's really no reason you can't create large numbers of threads.

There are definitely many reasons to prefer native threads over green
threads. This is the reason why you have seen a shift from green threads to
native threads in MRI, Rubinius, and the JVM.

Why do you want green threads?

-- 
Tony Arcieri

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<div class=3D"gmail_quote">On Wed, Jul 4, 2012 at 3:57 AM, rex goxman <span=
 dir=3D"ltr">&lt;<a href=3D"mailto:lists@ruby-forum.com" target=3D"_blank">=
lists@ruby-forum.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_qu=
ote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex=
">

I&#39;d like to use green threads (NOT kernel=A0threads) in a Ruby program =
I&#39;m writing. There is no reason for me to<br>
use kernel threads, and every reason to use green ones.<br></blockquote><di=
v><br></div><div>If you want to use 1.9, you&#39;re out of luck. That said,=
 you aren&#39;t stating your reasoning for why you would prefer green threa=
ds over native ones.</div>

<div><br></div><div>Native threads have a longer creation time and use marg=
inally more memory (they use ~20kB per thread last I measured), however the=
y generally perform better, particularly around I/O.=A0On platforms like Li=
nux scheduling is O(1) so there&#39;s really no reason you can&#39;t create=
 large numbers of threads.</div>

<div><br></div><div>There are definitely many reasons to prefer native thre=
ads over green threads. This is the reason why you have seen a shift from g=
reen threads to native threads in MRI, Rubinius, and the JVM.</div><div>

<br></div><div>Why do you want green threads?</div><div><br></div></div>-- =
<br>Tony Arcieri<br><br>

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