Do those issues still arise when OpenBLAS is compiled with USE_OPENMP=1 ? Keith
> On Jan 9, 2018, at 6:03 PM, Benjamin Tyner <bty...@gmail.com> wrote: > > Please pardon my ignorance, but doesn't OpenBLAS still not always play nicely > with multi-threaded OpenMP? (for example, don't race conditions sometimes > crop up)? If so, it might be nice to have the ability to temporarily disable > multi-threaded OpenMP (effectively: omp_set_num_threads(1)) for the duration > of operations using OpenBLAS. > > Regards > Ben > >> Julia using OpenBLAS is *very* reassuring. >> >> I agree that having it included as an options(...) feature should be OK. >> >> On Sun, Dec 17, 2017, 3:22 PM Juan Telleria <jtelleriar at gmail.com >> <https://stat.ethz.ch/mailman/listinfo/r-devel>> wrote: >> >> >/Julia Programming Language uses also OpenBlas, and it is actively >> >/>/maintained with bugs being fixed as I have checked it out: >> >/>//>/http://www.openblas.net/Changelog.txt />//>/So I still see it ok to >> >be included as an options(...) feature (by default />/off, just for >> >safety), over other Blas libraries. />//>/R could not use Intel MKL for >> >legal reasons (I think), because as long />/that R ships with GPL >> >libraries, shipping R by default with Non-GPL is />/illegal. />//>/Cheers, >> >/>/Juan />//>/El 17/12/2017 2:50 a. m., "Avraham Adler" <avraham.adler at >> >gmail.com <https://stat.ethz.ch/mailman/listinfo/r-devel>> />/escribió: >> >/>//>>/On Sat, Dec 16, 2017 at 7:41 PM, Kenny Bell <kmbell56 at gmail.com >> ><https://stat.ethz.ch/mailman/listinfo/r-devel>> 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.langfelder at gmail.com >> ><https://stat.ethz.ch/mailman/listinfo/r-devel>> 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 at >> >r-project.org <https://stat.ethz.ch/mailman/listinfo/r-devel> mailing list >> >/>>/https://stat.ethz.ch/mailman/listinfo/r-devel />>//>// >> [[alternative HTML version deleted]] > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
