El mié, 04-02-2009 a las 14:31 +0100, Momesso Andrea escribió: > On Wed, Feb 04, 2009 at 08:45:50AM -0430, Sebastián Magrí wrote: > [snip] > > > > > > Often on gentoo related IRC chanels comes someone who asks why his > > > firefox-bin (or openoffice-bin or *-bin) runs faster than his > > > built-from-source firefox. > > > > > > Usually chan's gurus answer that upstream packagers use all the possible > > > compiler optimizations (CFLAGS LDFLAGS etc.) for the given package, > > > while the average gentoo users keeps a set of "system wide very safe > > > optimizations" that are good for most packages, but not the best for > > > every particolar package. > > > > > > Is that statement correct? > > > > > > ======= > > > TopperH > > > ======= > > > > I've always felt the compiled openoffice faster than the binary one, but > > if it is not the case portage also gives you the chance of establishing > > per-package optimisations on '/etc/portage/env/' or in the paludis > > bashrc, so if one user wants an particular app to go faster, he can > > research about the best way to build this one. This way, the user can > > keep the very safe optimisations for the rest of the system and some > > -unsafe optimisations- for the packages he want. > > > > It is more about choices... > > Sure, I've used per-package optimizations myself in some particular > cases, but that's not the point. > > A package manteiner *should* know better than an average user which > optimizations will tune better their own package. > > My question can be put like this: Do binary distro's per package > optimiziations override the benefit of having arch specific > optimiziations that gentoo allows? > > > ======= > TopperH > =======
It does, but I am almost sure that most of the binary distro's package maintainers can't ship a package with hard optimisations because it will possibly work fine on his box but not in the user's box. There is where we heard histories about binary distros users compiling their apps to improve it's performance, possibly breaking their system at the same time. Gentoo maintainers *should* also know better than the users which optimisations can be given to the user for a package to build and work fine... Other case is when it represents a risk of having unstable apps, in that case dropping optimisations is necessary in order to have more stable apps.
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