Allocations for Julia built-in @threads in contrast to Polyester @batch

[DanielDoehring]

If we use the Julia built-in @threads instead of the Polyester.jl by out-commenting the relevant section

Trixi.jl/src/auxiliary/auxiliary.jl

Lines 227 to 235 in 3d899bc

	# return esc(quote
	# let
	# if Threads.nthreads() == 1
	# $(expr)
	# else
	# Threads.@threads $(expr)
	# end
	# end
	# end)

instead of

Trixi.jl/src/auxiliary/auxiliary.jl

Lines 245 to 247 in 3d899bc

	return esc(quote
	Trixi.@batch $(expr)
	end)

there are allocations in several elixirs, see a CI run from a hot-fix aimed PR., with very severe ones for the parabolic parts.

---

Related: #1766 and JuliaSIMD/Polyester.jl#128

[jlchan]

Does Threads.@threads :static help at all?

[DanielDoehring]

Does Threads.@threads :static help at all?

I.e.,

Threads.@threads :static $(expr) 

?

[jlchan]

As a for loop annotation - e.g., Threads.@threads :static for ....

It seemed to do pretty well compared to Polyester in some of my experiments.

[DanielDoehring]

Hm interesting, I should be able to change the PR relatively quickly.

[DanielDoehring]

Hm, this is not really looking good: #1768

[ranocha]

:static is required to make it correct (see #1768 (comment)) but I would not expect to see a difference in allocations