Re: RFC: Moving to -O3 for Fedora Linux

Carlos Rodriguez-Fernandez <carlosrodrifernandez@xxxxxxxxx> · Wed, 30 Oct 2024 23:22:11 -0700

I found some interesting ones [1][2]. The common denominator is that 
between -O2 and -O3, the runtime improvement is increased a little bit 
overall but in some cases it can be significant, while the power 
consumption also increases. The memory access also tends to decrease. 
None of those study analyze much memory consumption from mapped files. 
Not sure if it is a big deal.

Perhaps having a Fedora qcow2 image compiled with -O3 to compare would 
help to do some benchmarking and see.

[1] https://academic.oup.com/comjnl/article-pdf/58/1/95/5071667/bxt129.pdf
[2] https://ieeexplore.ieee.org/abstract/document/8109001

On 10/30/24 10:37 PM, Carlos Rodriguez-Fernandez wrote:
It would be great to see some empirical analysis about binary size 
increase, its impact on RAM consumption, and actual speed benefit, 
especially on Fedora. I'm having a hard time finding anything about it.

Regards,
Carlos R.F.

On 10/30/24 7:46 PM, Neal Gompa wrote:
Hey folks,

I know the idea of moving to -O3 has been briefly mentioned before in
other contexts when we've discussed uplifting the flags, but it looks
like Ubuntu is moving to -O3 for Ubuntu 25.04[1]. Is there a reason
why we shouldn't consider doing the same for Fedora Linux 42?

[1]: https://lists.ubuntu.com/archives/ubuntu-devel/2024- 
October/043164.html

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