In Julia, when running code for a second time, it should complete faster
because on the first run Julia is still compiling stuff. However today I
came across the complete opposite:
julia> A=rand(5000,5000);
julia> B=rand(5000,5000);
julia> for i=1:10
@time A*B;
end
elapsed time: 5.150001434 seconds (226166468 bytes allocated)
elapsed time: 9.537624646 seconds (200000112 bytes allocated)
elapsed time: 12.596928096 seconds (200000112 bytes allocated)
elapsed time: 14.036605961 seconds (200000112 bytes allocated)
elapsed time: 11.700367259 seconds (200000112 bytes allocated)
elapsed time: 14.919158958 seconds (200000112 bytes allocated)
elapsed time: 10.947261637 seconds (200000112 bytes allocated)
elapsed time: 15.112988735 seconds (200000112 bytes allocated)
elapsed time: 10.867003789 seconds (200000112 bytes allocated)
elapsed time: 14.920659541 seconds (200000112 bytes allocated)
The first run is actually faster than all the consecutive ones.
I installed Julia a new yesterday:
cd ~/Downloads
git clone https://github.com/JuliaLang/julia
sudo mv julia /opt/apps/julia-git
cd /opt/apps/julia-git
make -j 8
Can someone explain me why the first run is faster than the rest?
