[Rcpp-devel] RcppArmadillo BLAS/LAPACK force number of threads to 1

[Dirk Eddelbuettel]

Hi Scott,

On 13 August 2014 at 13:52, Scott Ritchie wrote:
| Thanks Dirk,
| 
| Since the original question has been answered (no there isn't a way to control
| this through Armadillo or Rcpp, and the problem is unrelated), I'll go bug the

One of the issue is that you start frim R when using Rcpp -- so you always
get R's BLAS/LAPACK combination.

| r-sig-hpc mailing list if I can't find a working answer.
| 
| Thanks for the additional pointers,

Sorry for the goose chase. This should be better documented -- maybe we'll
just write up a short Gallery post once done.

I should have a better pointer. There was also something by Simon U on this;
as I (very vaguely) recall the parallel may have needed a fix or something.

Cheers, Dirk
 
| Cheers,
| 
| Scott
| 
| 
| On 12 August 2014 21:24, Dirk Eddelbuettel <edd at debian.org> wrote:
| 
| 
|     On 12 August 2014 at 17:09, Scott Ritchie wrote:
|     | Well that's frustrating.
|     |
|     | I've tried the OpenMPController package without success, and tried to
|     | explicitly disable BLAS in the Armadillo headers and removing the linking
|     code
|     | in the Makevars files.
| 
|     That is IMHO the wrong approach. You want BLAS, you just want to control
|     it.
|     And as I tried to explain, Rcpp and Armadillo really have nothing to do
|     with it.
| 
|     This has all been discussed before, and AFAICT, also solved.  I think one
|     (R)
|     package did something wrong on intialization -- but AFAICR this was fixed a
|     while back.  Also check the r-sig-hpc archives on that.
| 
|     | If my reading of this thread: http://lists.r-forge.r-project.org/
|     pipermail/
|     | rcpp-devel/2012-June/003888.html is correct, I should be able to switch
|     to
|     | RcppEigen since it uses its own routines.
| 
|     You certainly can.
| 
|     I really do not think you have to.
|    
|     Dirk
|    
|     --
|     http://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org
| 
| 

-- 
http://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org