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What is Your Operating System of Choice?
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You will be Told about it Tomorrow. Go Home and Prepare Thyself.
(Score: 0) by Anonymous Coward on Friday April 25, @12:12AM (1 child)
0.5% improvement? We get more than that just by changing the instruction set flags to a more accurate values. All forms of optimization and tuning combined has resulted in speedups of almost 50% in some cases.
(Score: 0) by Anonymous Coward on Friday April 25, @05:13AM
Certainly you can get a big improvement by, say, having AVX enabled vs. having it disabled. But what happens in the real world is binary distros enable everything, and then the code determines at runtime what is available, and chooses the appropriate code path. So really what you are getting in most cases is just a size optimization, not a performance optimization. Maybe you can get more speedup in specific programs with -O3 or higher, which isn't safe to use system-wide.
Gentoo doesn't even allow you to compile glibc any more without all the compatibility cruft. If you build glibc today, it will have compatibility code for kernels going all the way back to 2.6. Ironically, binary distros are now better at this than Gentoo.