Re: Multi-core Support in Mathematica 5.2
- To: mathgroup at smc.vnet.net
- Subject: [mg74651] Re: Multi-core Support in Mathematica 5.2
- From: Antti Penttilä@smc.vnet.net
- Date: Thu, 29 Mar 2007 05:32:24 -0500 (EST)
- Organization: University of Helsinki
- References: <firstname.lastname@example.org> <email@example.com>
It's not rubbish - it uses multi-core via some linear algebra packages
(from Intel?) where multi-core is "easy" and safe to implement. You can
check if your system is properly configured by running e.g.
SingularValueDecomposition on a large random square matrix. If
multi-core support is on, MathKernel will reach ~100% CPU-load. If not,
check that the OMP_NUM_THREADS environment variable is set to 2.
General multi-core support is very hard to implement, because inside
loops (Do,Table,etc.) the code can change the values of some variables
that affect later iterations. Still, I suppose that we will see more
parallelized code in the future, since the processors are going into
multi-core systems (>2 cores per system).
> So basically the "touted" multi-core support is a load of rubbish.
> dwadding at atl.lmco.com wrote:
>> Wolfram advertises version 5.2 as being multi-core capable. When I
>> use the standard vectorized operations I can only get things to run on
>> one core. Can some one tell me exactly which Mathematica functions
>> can actually exploit multi-core?
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