I’m trying to time a function and keep its return value: b = @btime y = foo(x) but at the end y is not returned. How can get @btime to also return my result?

[image] Save @btime output New to Julia This is asked every other week, so probably we should have it directly in BenchmarkTools: julia> @eval BenchmarkTools macro btimed(args...) _, params = prunekwargs(args...) bench, trial, result = gensym(), gens…

I’m not clear on why you need this. I use bar = foo(spam); when I want results and @btime foo($spam); when I want to see how fast my function is. These are different missions for me.

@belapsed did not seem to work, @elapsed did. Moreover, @btime provides more info than just time and is supposed to be more accurate ?

What did not work? Can you show a reproducible example and tell us your expected behaviour?

It sounds like you just want y = @btime foo(x) However, I don’t see how this is useful. If this is part of a computation where you use y later, you probably don’t want to run foo(x) multiple times (which is what @btime does).

This is what I meant. @belapsed cannot return the computation result as I needed. [image]

What doesn’t work in the link I shared above? julia> @eval BenchmarkTools macro btimed(args...) _, params = prunekwargs(args...) bench, trial, result = gensym(), gensym(), gensym() trialmin, trialallocs = gensym(), gensym() tune_phase = hasevals(params) ?…

Yes. I replied to the wrong post

it would be great to have a way to do both though. Otherwise it’s just a waste of compute resources. BenchmarkTools.jl already calculates the result, why not also return it if needed ? Tha solution from @giordano is appropriate for cases where the result is deterministic, and it would be nice to se…

May I ask why is this macro not shipped inside BenchmarkTools.jl?

Retain computation results with @btime

New to Julia

giordano June 9, 2021, 9:35pm 3

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Retain computation results with @btime

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