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] > <javascript:>> 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> >> > >> >> >
