> Interesting, I was able to get faste LTO+PGO compile times than non-LTO,PGO.
> I however did testng only on combine.c compliation, so not very scientific.
>
> There are some cases FDO information is not streamed well in all cases. I
> will
> post patch for that later today. Perhaps it will ma
-Ursprüngliche Nachricht-
Gesendet: Dienstag, 26 März 2013 um 12:13:26 Uhr
Von: "Jan Hubicka"
An: "Markus Trippelsdorf"
Betreff: Re: Compiler speed (vanilla vs. LTO, PGO and LTO+PGO)
> Yes, the binary size is 8-10% smaller. Unfortunately there are no performance
> Yes, the binary size is 8-10% smaller. Unfortunately there are no performance
> improvements.
>
> LTO+PGO-disable-plugin:
> -rwxr-xr-x 1 markus markus 15025568 Mar 25 15:49 cc1
> -rwxr-xr-x 1 markus markus 16198584 Mar 25 15:49 cc1plus
> -rwxr-xr-x 1 markus markus 13907328 Mar 25 15:49 lto1
> -r
On 2013.03.25 at 15:17 +0100, Richard Biener wrote:
> On Mon, Mar 25, 2013 at 2:24 PM, Markus Trippelsdorf
> wrote:
> > On 2013.03.25 at 14:11 +0100, Richard Biener wrote:
> >> On Mon, Mar 25, 2013 at 1:56 PM, Markus Trippelsdorf
> >> wrote:
> >> > On 2013.03.25 at 08:06 +0100, Markus Trippelsdor
On Mon, Mar 25, 2013 at 2:24 PM, Markus Trippelsdorf
wrote:
> On 2013.03.25 at 14:11 +0100, Richard Biener wrote:
>> On Mon, Mar 25, 2013 at 1:56 PM, Markus Trippelsdorf
>> wrote:
>> > On 2013.03.25 at 08:06 +0100, Markus Trippelsdorf wrote:
>> >> On 2013.03.24 at 20:53 +0100, gcc_mailingl...@abw
On 2013.03.25 at 14:11 +0100, Richard Biener wrote:
> On Mon, Mar 25, 2013 at 1:56 PM, Markus Trippelsdorf
> wrote:
> > On 2013.03.25 at 08:06 +0100, Markus Trippelsdorf wrote:
> >> On 2013.03.24 at 20:53 +0100, gcc_mailingl...@abwesend.de wrote:
> >> >
> >> > is it useful to compile gcc 4.8.0 wit
On 2013.03.25 at 06:07 -0700, Andi Kleen wrote:
> Markus Trippelsdorf 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 o
On Mon, Mar 25, 2013 at 1:56 PM, Markus Trippelsdorf
wrote:
> On 2013.03.25 at 08:06 +0100, Markus Trippelsdorf wrote:
>> On 2013.03.24 at 20:53 +0100, gcc_mailingl...@abwesend.de wrote:
>> >
>> > is it useful to compile gcc 4.8.0 with the lto option?
>>
>> If you want a (slightly) faster compiler
Markus Trippelsdorf 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
generate
On 2013.03.25 at 08:06 +0100, Markus Trippelsdorf wrote:
> On 2013.03.24 at 20:53 +0100, gcc_mailingl...@abwesend.de wrote:
> >
> > is it useful to compile gcc 4.8.0 with the lto option?
>
> If you want a (slightly) faster compiler then yes.
> Simply add "--with-build-config=bootstrap-lto" to you
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