Le samedi 23 août 2014 à 08:55 -0400, Stefan Karpinski a écrit : > There's a reasonable chance that Debian/Ubuntu has a pessimized > OpenBLAS for the sake of portability. It's also possible that the Debian package (these are the nighlties, right?) should depend on (or recommend) openblas-devel, and not only openblas, since Julia is currently not able to dlopen() a library if there's only libopenblas.so.0, and no libopenblas.so (#6742). I know I initially forgot to add this dependency in my RPM package.
Regards > On Sat, Aug 23, 2014 at 3:18 AM, Don MacMillen > <[email protected]> wrote: > sudo apt-get install libopenblas-dev > > > julia> @time begin a = rand(5000,5000); b = rand(5000); x =a > \b end; > elapsed time: 2.517259033 seconds (400100776 bytes allocated, > 1.44% gc time) > > > Thanks John. > > On Friday, August 22, 2014 11:11:09 PM UTC-7, John Myles White > wrote: > Perhaps you have a defective BLAS installation for > 0.3? > > > — John > > > On Aug 22, 2014, at 11:08 PM, Don MacMillen > <[email protected]> wrote: > > > Hmmm, thx for the experiment. To clarify, I assumed > > that the normal behavior would have been closer > > to the 4.0 time, but I don't have anything earlier. > > The 0.3 was just updated using apt-get on Ubuntu > > 14.04 > > (VM running on windows). 0.4 was of course cloned > > and compiled. Just scraped and re-installed 0.3 > > with apt-get, and I still see the same behavior. > > (This time remembering to discard initial compile > > time) > > > > > > julia> @time begin a = rand(5000,5000); b = > > rand(5000); x =a\b end; > > elapsed time: 30.509950844 seconds (400100776 bytes > > allocated, 0.11% gc time) > > > > > > It's mystery to me. If I learn anything more, will > > let you know. > > Thanks again. > > > > > > Don > > > > > > > > > > On Friday, August 22, 2014 9:54:22 PM UTC-7, John > > Myles White wrote: > > I don’t see this behavior at all on my > > system. > > > > After discarding an intial compilation step, > > here’s what I get: > > > > 0.3 — elapsed time: 3.013803287 seconds > > (400120776 bytes allocated, 1.77% gc time) > > 0.4 — elapsed time: 2.920384195 seconds > > (400120776 bytes allocated, 1.89% gc time) > > > > Also to clarify: do you mean to refer to 0.3 > > as a regression relative 0.4? > > > > — John > > > > On Aug 22, 2014, at 9:50 PM, Don MacMillen > > <[email protected]> wrote: > > > > > Is anyone else seeing the following? If > > not, what could I have done to my env to > > trigger it? > > > > > > Thx. > > > > > > julia> VERSION > > > v"0.3.0" > > > > > > julia> @time begin a = rand(5000,5000); b > > = rand(5000); x =a\b end; > > > elapsed time: 31.413347385 seconds > > (440084348 bytes allocated, 0.12% gc time) > > > > > > julia> > > > > > > ---------------- > > > > > > julia> VERSION > > > v"0.4.0-dev+308" > > > > > > julia> @time begin a = rand(5000,5000); b > > = rand(5000); x =a\b end; > > > elapsed time: 1.686715561 seconds > > (431769824 bytes allocated, 0.87% gc time) > > > > > > julia> > > > > > > > > >
