On 07/18/2013 10:33 PM, Dirk Eddelbuettel wrote:
On 18 July 2013 at 22:14, Elizabeth Tighe wrote: | | Dirk, That worked! Sort of. It's gone from running processes on one | processor to two processors and Rbenchmark ran in 64 seconds rather than | 178. Is there a way to get it to use more than 2 processors when it | can? (revo mkl used all available processors by default). That is by R's "design choice" as the parallel package sets the default to two. See help(options), and/or the vignette for r-sig-hpc. There have been helpful discussion over on r-sig-hpc over the months; you probably want to lurk on that list / google-search its archives.
I am a little late to this thread, but I have an update. Many moons ago, I filed a bug/request to get the openblas package to run on more than two threads. Every once in a while, I would get an update to that request, and finally the said the had fixed that issue. I added this to my "to do" pile, and I have finally gotten around to testing it.
And the good news is that it works. If you go to my RDev PPA (https://launchpad.net/~marutter/+archive/rdev), you will find the latest version of Ubuntu's obenblas package backported to Raring, Quantal, and Precise. You will also find updated versions of atlas and blas, as the new version of openblas breaks R if those are not installed as well. I think Raring is fine, but Quantal and Precise need at least one installed.
If you install the libopenblas-base pacakge, it should work right out of the box. On my quad core machine, it ran 4 threads without having to do anything besides installing the package. R-benchmark-25.R went from 20.1 to 16.6 seconds, but all cores were being used for the Matrix function part of the test.
Hope this helps, Michael -- Dr. Michael A. Rutter School of Science Penn State Erie, The Behrend College 4205 College Drive Erie, PA 16563 http://math.bd.psu.edu/faculty/rutter [email protected] _______________________________________________ R-SIG-Debian mailing list [email protected] https://stat.ethz.ch/mailman/listinfo/r-sig-debian
