On Sat, Dec 16, 2017 at 7:41 PM, Kenny Bell <kmbel...@gmail.com> wrote: > It seems like many of the multi-threaded BLASes have some sort of > fundamental problem preventing use in the way Juan suggests: > > - Dirk's vignette states that ATLAS "fixes the number of cores used at > compile-time and cannot vary this setting at run-time", so any > user-friendly implementation for R would have to compile ATLAS for 1-16 > threads to allow the user to switch at run-time. This might dramatically > affect install times. > > - MKL seems like it's been outright rejected in the past based on not > being "free-enough". > > - OpenBLAS causes crashes. > > Has anyone tried ExBLAS for use with R? > > On Sun, Dec 17, 2017 at 1:03 PM, Peter Langfelder < > peter.langfel...@gmail.com> wrote: > >> I would be very cautious about OpenBLAS in particular... from time to >> time I get complains from users that compiled code calculations in my >> WGCNA package crash or produce wrong answers with large data, and they >> all come from OpenBLAS users. I am yet to reproduce any of their >> crashes when using MKL and ATLAS BLAS implementations. >> >> Just my 2 cents... >> >> Peter
I've been building R on Windows 64 bit with OpenBLAS for years and my builds pass check-devel. For a while in the past it failed one check as the tolerance was 5e-5 and with my build of OpenBLAS the error was 5.4e-5 or 5.7e-5, but that was changed around R 3.3, if I recall correctly. I provide descriptions here [1], but I haven't gone so far as to post compiled Rblas.dlls just yet. My personal build sets 4 threads when compiling OpenBLAS itself as I'm currently on a quad-core SandyBridge. In tests I ran a few years ago, both single and multi threaded BLAS compile and then can be compiled into R with no issues (on my platforms, at least). Most matrix operations performed better with multi-threaded except for R's eigenvalue decomposition, to the nest of my recollection. Avi [1] https://www.avrahamadler.com/r-tips/build-openblas-for-windows-r64/ ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
