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Re: activate more than one core in Mathematica 6.0 (for win)?

• To: mathgroup at smc.vnet.net
• Subject: [mg79797] Re: activate more than one core in Mathematica 6.0 (for win)?
• From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
• Date: Sat, 4 Aug 2007 06:03:09 -0400 (EDT)
• Organization: The Open University, Milton Keynes, UK
• References: <f8v18h$db8$1@smc.vnet.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