BLAS control on R

$ export GOTO_NUM_THREADS=1   # The default is the number of the cores.
$ R -q
> library(blasctl)
> A<-matrix(runif(3e3^2),3e3,3e3)
> blas_get_num_procs() 
[1] 1
> system.time(A%*%A)
   user  system elapsed 
  3.992   0.012   4.003 
> blas_set_num_threads(4)
> system.time(A%*%A)
   user  system elapsed 
  4.332   0.048   1.234
When it uses the MAX core of default, WARMUP(default of GotoBLAS) adjusts OMP_NUM_THREADS of OpenMP to one.
This package is usable in OpenMP based BLAS(Exclude on Windows), ACML, MKL and GotoBLAS.
blasctl_0.1.tar.gz
Source package
blasctl_0.1.zip
Windows Binary package
[ICO]NameLast modifiedSizeDescription
[DIR]Parent Directory  -  
[ ]blasctl_0.2.zip12-Feb-2011 03:52 17K 
[ ]blasctl_0.2.tar.gz11-Feb-2011 21:42 23K 
[ ]blasctl_0.1.zip09-Dec-2010 20:12 17K 
[ ]blasctl_0.1.tar.gz09-Dec-2010 20:09 23K