how to use the library with maximum performance

[johannesvollmer]

What can be improved or is missing?

the documentation should provide the basic steps necessary to obtain the best performance. for example, setting the target cpu to native in .cargo/config.toml. But also LTO. feature flags in dependencies, like half: use-intrinsics. and which exr variants are faster and whatnot.

[Shnatsel]

We should also back that up with benchmarks. I doubt LTO is going to be much of a gain. -C codegen-units=1 is also worth a shot. And if -Ctarget-cpu=native does indeed help, we should just identify the functions that get a speedup and multiversion them using the multiversion crate - that way the speedups will be accessible to everyone without the need to use -Ctarget-cpu=native.

[johannesvollmer]

great ideas :)

[Shnatsel]

The latest version of half crate now uses the f16 conversion intrinsics on stable Rust, so reading to f16 will be a lot faster on half v2.3.1 and later.

[johannesvollmer]

awesome, does that mean we can finally continue that pull request from some time ago? :) #191