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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

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is Wine with -O3 and -march=native a placebo? (lemmygrad.ml)

submitted 7 months ago* (last edited 7 months ago) by olgas_husband@lemmygrad.ml to c/linux@lemmy.ml

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For nerd purposes I've been trying to custom compile Wine to see if i can squeeze some performance out of it, i pulled out the -g flag and put in its place -O3 with march native. i don't know how to benchmark properly to see if there at least a marginal gain, so idk if it is a placebo or not. tried to search for articles in the subject but found none

has anyone tried it or know an article that explored the subject?

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[–] Max_P@lemmy.max-p.me 7 points 7 months ago (1 children)

It doesn't matter because for the most part, you're not spending most of your time in Wine code, you're spending your time in the application's code.

So you might see some improvements if you're running something that's more of a Win32 API performance benchmark than an application benchmark.

But even then, -O2 is already pretty good, and -O3 is a bit of a gamble whether it'll be faster or slower. Sometimes O3 will pull the big guns and the real world dataset is always small and it wastes time in setup.

-march=native might give you some nice speedups but it depends entirely on your CPU. If you have the latest CPU with all the features, it may take advantage of it.

But it's still all mostly things like using SIMD instructions to crunch through numbers faster. The Windows API doesn't do a whole lot of that in the first place, but there's also a few ABI boundaries you can't change. It needs to receive and output data in the expected format in the expected registers. It can only optimize things that happen internally in Wine and are never observed by the application it's running, further reducing the amount of optimization potential.

So, it's kind of a waste of time. It's a lot more worth it for like video codecs and image processing

[–] olgas_husband@lemmygrad.ml 1 points 7 months ago (1 children)

many thanks for the explanation.

i use a ryzen 5 5600x, so march native should do something.

[–] Atemu@lemmy.ml 2 points 7 months ago* (last edited 7 months ago)

i use a ryzen 5 5600x, so march native should do something.

It fully depends on the code. If the code in question does not do the kinds of calculations that can benefit from SIMD instructions, march=native will do absolutely nothing for you, no matter how special or new your CPU might be.

I doubt WINE does many things that would benefit from SIMD but the only way to know for sure is to test it out.