From: Paul Brannan <pbrannan@...>
Date: 2008-01-06T11:40:13+09:00
Subject: Re: Experimental PATCH to improve thread performance

Brent Roman wrote:
> Hi Nobu,
> 
> Thanks for at least looking at this little hack.
> I would assume, given the great performance of 1.9 on
> these benchmarks, that ruby19 is not copying stacks at all.
> I actually see a way to avoid all stack copying on
> context switches for the ruby18 and 16 series, but
> I probably won't bother implementing it because I
> expect you'll have 19 debugged soon.

I've tried getting rid of the stack copying, but it's definitely 
nontrivial.  The stack copying causes problems in our C++ extensions, so 
our rule of thumb is to not use threads at all when those extensions are 
being used (there is a safe way to make it work, but it's easier just to 
use an event loop).

I still haven't tried the patch yet against our threaded code, but I'll 
try to play with it this week.

Paul