From: Pierre Habouzit <madcoder@debian.org>
Date: Thu, 10 Jul 2008 09:33:09 GMT
Subject: Re: THREADED_DELTA_SEARCH
Message-ID: <20080710093308.GF24819@artemis.madism.org>
In-Reply-To: <m3hcaydswg.fsf@localhost.localdomain>

On Thu, Jul 10, 2008 at 08:51:06AM +0000, Jakub Narebski wrote:
> Pierre Habouzit <madcoder@debian.org> writes:
> 
> >   I'm using it in production for quite a long time now, and I wonder if
> > there is any specific reason why it's not default. Debian activated it
> > by default too a couple of weeks ago, which means that it's in
> > production on quite a large scale, and there are no issues reported
> > either. Would a patch making it default be accepted ? It's quite handy
> > given that SMP machines are really pervasive nowadays…
> 
> Doues our ./configure detects if it makes sense (i.e. if it is SMP
> machine)?

  I don't know if it does, but it wouldn't make sense for distros.

>  What is the cost of THREADED_DELTA_SEARCH for single processor
> single core machine?

  Threading has to be enabled in the configuration, and there is a
--thread=0 mode that enables autodetection of the number of CPUs online.
so there is no overhead for single CPU systems.

-- 
·O·  Pierre Habouzit
··O                                                madcoder@debian.org
OOO                                                http://www.madism.org