activate more than one core in Mathematica 6.0 (for win)? - comp.soft-sys.math.mathematica

Message from discussion activate more than one core in Mathematica 6.0 (for win)?
Path: g2news2.google.com!news1.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!nx02.iad01.newshosting.com!newshosting.com!198.186.194.247.MISMATCH!news-xxxfer.readnews.com!textspool1.readnews.com!news-out.readnews.com!beast.readnews.com!63.218.45.203.MISMATCH!newsfeeds.sol.net!posts.news.twtelecom.net!nnrp2.twtelecom.net!not-for-mail
From: Jean-Marc Gulliet <jeanmarc.gull...@gmail.com>
Newsgroups: comp.soft-sys.math.mathematica
Subject: Re: activate more than one core in Mathematica 6.0 (for win)?
Date: Sat, 4 Aug 2007 10:18:57 +0000 (UTC)
Organization: The Open University, Milton Keynes, UK
Sender: st...@smc.vnet.net
Approved: Steven M. Christensen <st...@smc.vnet.net>, Moderator
Message-ID: <f91jqh$7oa$1@smc.vnet.net>
References: <f8v18h$db8$1@smc.vnet.net>
Lines: 19
NNTP-Posting-Date: 04 Aug 2007 10:18:50 GMT
NNTP-Posting-Host: 61ab30f5.news.twtelecom.net
X-Trace: DXC==@?lS]dn@2Wn`k2nf64]0\C_A=>8kQj6]Y;@_o827nGS[En]MS=B:]SEFiONJ7[GoVoaT<_kTY;M^
X-Complaints-To: abuse@twtelecom.net

kristoph wrote:
> Hi,
> 
> How can Mathematica 6.0 use more than one core of a quad core cpu
> under Windows Vista? During calculations the system requires only 25 %
> of its capacity. This implies that it uses only one of the four cores.
> 
> Thanks for answer,
> Kristoph

You could try to increase the value of the system variable 
OMP_NUM_THREADS to 4.

See the following thread for detail, "Performance--Dual Core"
http://groups.google.com/group/comp.soft-sys.math.mathematica/browse_thread/thread/17751112a337a3c2/a78b9f2c7c64094e?lnk=gst&q=OMP_NUM_THREADS&rnum=2#a78b9f2c7c64094e

Regards,
Jean-Marc