[R-sig-Debian] R and multi cpu ATLAS

Andrew Piskorski atp at piskorski.com
Sun Jun 6 08:05:55 CEST 2010

On Fri, Jun 04, 2010 at 04:16:44PM -0500, Paul Johnson wrote:

> Please run this and see if the last command causes the use of more
> than one core. With GotoBLAS2 or the Intel MKL as BLAS, it does

Nope, as expected it does not (with Atlas).

> mm <- matrix(rnorm(10^7), ncol = 10^3)
> system.time(crossprod(mm))
> system.time(mmm <- mm %*% t(mm))

Andrew Piskorski <atp at piskorski.com>

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