That definitely smells like a GC issue. Python doesn't have this particular problem since it uses reference counting.
On Tue, Jun 17, 2014 at 12:21 PM, Cristóvão Duarte Sousa <cris...@gmail.com> wrote: > I've just done measurements of algorithm inner loop times in my machine by > changing the code has shown in this commit > <https://github.com/cdsousa/Comparison-Programming-Languages-Economics/commit/4f6198ad24adc146c268a1c2eeac14d5ae0f300c> > . > > I've found out something... see for yourself: > > using Winston > numba_times = readdlm("numba_times.dat")[10:end]; > plot(numba_times) > > > <https://lh6.googleusercontent.com/-m1c6SAbijVM/U6BpmBmFbqI/AAAAAAAADdc/wtxnKuGFDy0/s1600/numba_times.png> > julia_times = readdlm("julia_times.dat")[10:end]; > plot(julia_times) > > > <https://lh4.googleusercontent.com/-7iprMnjyZQY/U6Bp8gHVNJI/AAAAAAAADdk/yUgu8RyZ-Kw/s1600/julia_times.png> > println((median(numba_times), mean(numba_times), var(numba_times))) > (0.0028225183486938477,0.0028575707378805993,2.4830103817464292e-8) > > println((median(julia_times), mean(julia_times), var(julia_times))) > (0.0028240440000000004,0.0034863882123824454,1.7058255003790299e-6) > > So, while inner loop times have more or less the same median on both Julia > and Numba tests, the mean and variance are higher in Julia. > > Can that be due to the garbage collector being kicking in? > > > On Monday, June 16, 2014 4:52:07 PM UTC+1, Florian Oswald wrote: >> >> Dear all, >> >> I thought you might find this paper interesting: http://economics. >> sas.upenn.edu/~jesusfv/comparison_languages.pdf >> >> It takes a standard model from macro economics and computes it's solution >> with an identical algorithm in several languages. Julia is roughly 2.6 >> times slower than the best C++ executable. I was bit puzzled by the result, >> since in the benchmarks on http://julialang.org/, the slowest test is >> 1.66 times C. I realize that those benchmarks can't cover all possible >> situations. That said, I couldn't really find anything unusual in the Julia >> code, did some profiling and removed type inference, but still that's as >> fast as I got it. That's not to say that I'm disappointed, I still think >> this is great. Did I miss something obvious here or is there something >> specific to this algorithm? >> >> The codes are on github at >> >> https://github.com/jesusfv/Comparison-Programming-Languages-Economics >> >> >>
