From: Regis d'Aubarede <regis.aubarede@...>
Date: 2010-12-15T21:22:50+09:00
Subject: Re: Ruby 1.9.2 : Io performance when application use multithread

Eric Hodel wrote in post #968393:
> On Dec 14, 2010, at 11:07, Eric Hodel wrote:

> For the windows slowdown, perhaps better buffer sizes will help.  It's
> possible that in threaded mode your odd-sized buffers are causing some
> kind of starvation.

Test of your version with  ruby 1.9.1 on linux : 30% better flow,
but 10% diff between thread/no thread keep on.

Perhaps the GIL cost is effective : the reading loop is very
short :
 while(len>0) len-=io.read(x) end

and so GIL do
 while() release(GIL); io.read; get(GIL) end

And GIL cost is perhaps less heavy on OSX then on Windows.

> If this doesn't help your speed issue try reporting this to the
> ruby-core mailing list.
Its done, but no response...

Thank you very much for your suggestions,
Regis

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