Just for normies like me who don’t know what Simon meant :-)
1. Open terminal.app and cd to where the relevant files are to keep commands
manageable in length
cd /Library/Frameworks/R.framework/Resources/lib/
2. Find the paths to different versions of veclib by ls’ing the directory they
should live in:
ls -l libRblas*dylib
The existing symbolic link will look like this
lrwxr-xr-x 1 root admin 16 24 Sep 12:10 libRblas.dylib ->
libRblas.0.dylib
Which means calls to “libRblas.dylib” will resolve to "libRblas.0.dylib"
3. Overwrite this link with a new one from Apple's veclib
(libRblas.vecLib.dylib ) to libRblas.dylib
ln -s -i -v libRblas.vecLib.dylib libRblas.dylib
When you restart R, it should now call libRblas.vecLib.dylib for math
To switch back
cd /Library/Frameworks/R.framework/Resources/lib/
ln -s -i -v libRblas.0.dylib libRblas.dylib
t
PS: The performance boost is staggering!!
I. Matrix calculation Apple Blas (Sec) Default Blas (Sec)
gain (loss)
Creation, transp., deformation of a 2500x2500 matrix 0.546 0.672 123%
2400x2400 normal distributed random matrix ^1000 0.139 0.139 100%
Sorting of 7,000,000 random values 0.600 0.605 101%
2800x2800 cross-product matrix (b = a' * a) 0.210 9.061 4315% !!
Linear regr. over a 3000x3000 matrix (c = a \ b') 0.134 4.379 3276%
Trimmed geom. mean (2 extremes eliminated) 0.252 1.212
482%
II. Matrix functions
FFT over 2,400,000 random values 0.198 0.183 92%
Eigenvalues of a 640x640 random matrix 0.295 0.625 212%
Determinant of a 2500x2500 random matrix 0.146 2.891 1980% !!
Cholesky decomposition of a 3000x3000 matrix 0.222 3.772 1696% !!
Inverse of a 1600x1600 random matrix 0.284 2.417 852%
Trimmed geom. mean (2 extremes eliminated) 0.232 1.634
704%
III. Programmation
3,500,000 Fibonacci numbers calculation (vector calc) 0.204 0.204 100%
Creation of a 3000x3000 Hilbert matrix (matrix calc) 0.232 0.211 91%
Grand common divisors of 400,000 pairs (recursion) 0.274 0.243 89%
Creation of a 500x500 Toeplitz matrix (loops) 0.038 0.041 106%
Escoufier's method on a 45x45 matrix (mixed) 0.260 0.307 118%
Trimmed geom. mean (2 extremes eliminated) 0.231 0.219
95%
Total time for all 15 tests 3.782 25.749 681%
Overall mean (sum of I, II and III trimmed means/3) 0.238 0.757 318%
The University of Edinburgh is a charitable body, registered in Scotland, with
registration number SC005336. Is e buidheann carthannais a th’ ann an Oilthigh
Dhùn Èideann, clàraichte an Alba, àireamh clàraidh SC005336.
[[alternative HTML version deleted]]
_______________________________________________
R-SIG-Mac mailing list
R-SIG-Mac@r-project.org
https://stat.ethz.ch/mailman/listinfo/r-sig-mac
