Compiler speed (vanilla vs. LTO, PGO and LTO+PGO)

[Andi Kleen]

Markus Trippelsdorf <markus@trippelsdorf.de> writes:
>
> So it appears, contrary to the advice given above, that it is not useful
> to build gcc 4.8.0 with the lto option at the moment.

Did you build firefox/kernel with debug info on/off?

Often debug info on changes the compiler performance significantly, as it
generates a lot more IO.

-Andi

-- 
ak@linux.intel.com -- Speaking for myself only