[R-sig-hpc] Matrix multiplication

Brian G. Peterson brian at braverock.com
Tue Mar 13 20:36:08 CET 2012

On Tue, 2012-03-13 at 15:05 -0400, Paul Gilbert wrote:
> (I have a long history of getting things that should 'just work' to 
> 'just not work'.) But I didn't really state my question very well. I'm
> really wondering about two related situations. How can I confirm after
> a change to underlying system that R is using the new configuration,
> and second, if I am  running benchmarks in R is there an easy way to
> record the underlying configuration that is being used.

I usually use 'top' in another 'screen' window.  In the case of
explicity parallelization, you'll see more R processes.  In the case of
implicit parallelization, you'll see (at least) the CPU utilization go
up to or over 100% on the single R process (and up to 100% on each
individual core) while the calculation happens.

Good luck,

   - Brian
Brian G. Peterson
Ph: 773-459-4973
IM: bgpbraverock

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