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Re: Compiler speed (vanilla vs. LTO, PGO and LTO+PGO)
- From: Markus Trippelsdorf <markus at trippelsdorf dot de>
- To: Andi Kleen <andi at firstfloor dot org>
- Cc: gcc_mailinglist at abwesend dot de, gcc-help at gcc dot gnu dot org, gcc at gcc dot gnu dot org
- Date: Mon, 25 Mar 2013 14:12:48 +0100
- Subject: Re: Compiler speed (vanilla vs. LTO, PGO and LTO+PGO)
- References: <trinity-46d93944-181a-4a69-836d-b1cd693c2d5c-1364154786327 at msvc024> <20130325070650 dot GA12504 at x4> <20130325125652 dot GB12504 at x4> <m2k3oviq68 dot fsf at firstfloor dot org>
On 2013.03.25 at 06:07 -0700, Andi Kleen wrote:
> 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.
Debug info was turned off in all cases (kernel, Firefox, gcc).
--
Markus