Optimized RPMS

[Patricio Bruna V]

Im thinking in rebuild my owns RPM optmized for P4, fedora core really
goes slow. are any predefined step, some automatic tool for do this?

thx

[Warren Togami]

Patricio Bruna wrote:
> Im thinking in rebuild my owns RPM optmized for P4, fedora core really
> goes slow. are any predefined step, some automatic tool for do this?
>
> thx

Don't bother.  You will have almost zero benefit do to today's greatly 
improved compilers and -mtune=pentium4 default on all FC3 packages.  You 
will waste far more timing in rebuilding packages than you would 
possibly gain.

http://www.funroll-loops.org/
Refer to this site for similar sentiments.

Warren Togami
[e-mail]

[Patricio Bruna V]

El mar, 05-10-2004 a las 18:59 -1000, Warren Togami escribió:
> Patricio Bruna wrote:
> > Im thinking in rebuild my owns RPM optmized for P4, fedora core really
> > goes slow. are any predefined step, some automatic tool for do this?
> >
> > thx
>
> Don't bother.  You will have almost zero benefit do to today's greatly 
> improved compilers and -mtune=pentium4 default on all FC3 packages.  You 
> will waste far more timing in rebuilding packages than you would 
> possibly gain.
>
> http://www.funroll-loops.org/
> Refer to this site for similar sentiments.
>
> Warren Togami
> [e-mail]

very interesting, what its that -mtune=pentium4? where i can read about
it?

[Ralf Ertzinger]

On Wed, Oct 06, 2004 at 10:06:33AM -0400, Patricio Bruna wrote:
> very interesting, what its that -mtune=pentium4? where i can read about
> it?

It schedules instructions in a way that favours the P4 architecture, but
does not use instructions specific to that chip. So the binaries will
run on everything >=i386 (at least in theory, I think nobody actually
tested FC on a 386 :), but will run even better on P4s.

[Féliciano Matias]

Le mercredi 06 octobre 2004 à 00:19 -0400, Patricio Bruna a écrit :
> Im thinking in rebuild my owns RPM optmized for P4, fedora core really
> goes slow.

I'll not be surprised if fedora core will continue to go "really slow"
even if you rebuild all packages.

The current setting (from /usr/lib/rpm/redhat/rpmrc) :
i386 => -O2 -g -pipe -m32 -march=i386 -mtune=pentium4
i686 => -O2 -g -pipe -m32 -march=i686 -mtune=pentium4

Default is set to i386 but some packages are also compiled with i686
flags :
        # rpm -q --queryformat "%{ARCH} %{NAME}\n" -a | grep ^i686
        i686 glibc
        i686 nptl-devel
        i686 openssl
        i686 kernel
> are any predefined step, some automatic tool for do this?
>
> thx
>
> -- 
> Patricio Bruna Villarroel
> Red Hat Certified Engineer
> Ingeniero Soporte
> Linux Center S.A.
> Fono: 2745000
> Canada 239, Providencia
> Santiago

[Stephen John Smoogen]

On Wed, 06 Oct 2004 00:19:47 -0400, Patricio Bruna
 wrote:
> Im thinking in rebuild my owns RPM optmized for P4, fedora core really
> goes slow. are any predefined step, some automatic tool for do this?
>
> thx

I wont say dont bother, but you really need to make sure you post any
improvements can be seen. There is a lot of talk on both sides.. but
very few numbers.