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Yep. Adding "-C target-cpu=native" to rustc on my desktop computer consistently gets a ~10-15% performance boost compared to the default target. The default tar

Yep. Adding "-C target-cpu=native" to rustc on my desktop computer consistently gets a ~10-15% performance boost compared to the default target. The default target is extremely conservative. As far as I can tell, it doesn't take advantage of any CPU features added in the last 20 years. (The k8 came out in 2003.)

jeffbee 3y ago
Those Gentoo people were onto something.
- alexey-salmin 3y ago
  Funny that it stopped being the case for a while around 2006. AMD64 became widespread while also being very new, closing the gap between "default" and "native".
- skykooler 3y ago
  Of course, gentoo just started using prebuilt packages a few months ago…
wongarsu 3y ago
Red Hat Enterprise Linux has upgraded their default target to x86-64-v2 and is considering switching to x86-64-v3 for RHEL 10 (which should release around 2026?). I'd take that as a sign that those might be reasonable choices for newly released software. Some linux distros also give you the option to either get a version compatible with ancient hardware or the optimized x86-64-v3 version, which seems like a good compromise.