I am new to Julia and very exited to get into it. As part of learning, I am trying to use the @benchmark macro to see how I can optimize different aspects of Julia code, as well as the impact of for example = vs .=, etc. However, when using it in VSCode it doesn’t display anything. If it’s relevant, I am running Julia on the VSCode Terminal
Thank you in advance!
It you are coming from another language make sure you don’t put a “;” at the end of the line. Also you can use ‘@btime’ which actually prints rather than relying on display
Sure! Here it is, thank you
using BenchmarkTools
using FFTW
import Plots
function timefft()
N = 2^9
x = rand(ComplexF64, N)
for i = 1:100
x .= rand(ComplexF64, N)
fft(x)
end
end
timefft()
@time timefft()
println()
@benchmark timefft()
Just so you know that benchmark is going to be polluted by the time of rand
It seems to work on my end, can you maybe send a screenshot of what your window looks like after executing the last line?
@gdalle I would show it, but the only that the only thing that appears in my VSCode Terminal is my path when I execute, for example
@benchmark sin(3)
Are you executing code lines from a file, jupyter-style, or directly from the REPL?
In the VSCode Julia extension settings there are options to toggle on whether you want outputs from such a process to be displayed in the REPL, maybe that’s it?
If your purpose is to time the execution of fft, then this is not the right way to do it. There’s no need for a loop, since @benchmark will run the code many times for you. Just do this:
x = rand(ComplexF64, N)
@benchmark fft($x)
That’s all you need.
You can try to force the output:
bm = @benchmark timefft()
@show bm