Re: [gentoo-performance] How is it possible ???

[Andrea Pretto]

I'm just rebuilting my system with that optimizations.

Thanks!
--- Roman Gaufman <hackeron@×××××××××.com> ha scritto:
> Well, higher optimization (-O) number, normally
> means more ram is used and the
> CPU cache is flooded more.
>
> I bet your Athlon's core is only 256Kb cache or
> less. Run
> cat /proc/cpuinfo ... -O3 seems good for 512Kb or
> more, but uses more ram. So
> try recompiling gnome with -O2 or -Os ... Dont be
> mis-leaded by the number 2,
> it has a lot of optimization. And -Os is like -O3
> but ensures that if
> optimization increases file size or ram usage, it
> isnt used, so you can lose
> some optimization but gain a few Mb in filesize.
>
> I find on low cache CPUs, with not much ram, -Os is
> the way to go, and I run
> -Os on my Epia Via 1ghz Nehemiah core, and it runs
> very noticeably snappier
> than with -O3.
>
> Anyway, hope that helps.
>
>
> On Saturday 26 June 2004 18:05, Andrea Pretto wrote:
> > Hi
> >
> > I have a gentoo installed and it works very well.
> > Without X it start from boot to login in 15
> seconds,
> > and it uses about 15 mb of ram.
> > Ok. It's very fast and "cheaper" than Slackware
> and
> > others......
> >
> > Now I have installed gnome ( 2.6.0 ) and it's very
> > strange..........
> > Only with GDM started (before to login) the system
> > uses about 85mb of ram, and (the gdm) start 3-4
> > seconds slower than slackware.........the
> situation is
> > worrisome......
> >
> > I insert the name and password so gnome
> > starts.................and even gnome starts 6-7
> > seconds slower than slackware and the ram used go
> up
> > to 140mb.
> > Now the situation is disastrous....
> >
> > How is it possible ???
> > Why this horrible performance ???
> > Is it a guilt of gnome 2.6 ???
> >
> > My emerge info as follow:
> >
> > Portage 2.0.50-r8 (default-x86-2004.0, gcc-3.3.3,
> > glibc-2.3.3.20040420-r0, 2.4.26)
> >
>
=================================================================
> > System uname: 2.4.26 i686 AMD Athlon(tm) XP 2600+
> > Gentoo Base System version 1.4.16
> > Autoconf: sys-devel/autoconf-2.59-r3
> > Automake: sys-devel/automake-1.8.3
> > ACCEPT_KEYWORDS="x86"
> > AUTOCLEAN="yes"
> > CFLAGS="-O3 -march=athlon-xp -pipe
> > -fprefetch-loop-arrays -funroll-loops -fPIC
> > -maccumulate-outgoing-args -minline-all-stringops
> > -mfpmath=sse "
> > CHOST="i686-pc-linux-gnu"
> > COMPILER="gcc3"
> > CONFIG_PROTECT="/etc /usr/X11R6/lib/X11/xkb
> > /usr/kde/2/share/config /usr/kde/3/share/config
> > /usr/lib/mozilla/defaults/pref /usr/share/config
> > /usr/share/texmf/dvipdfm/config/
> > /usr/share/texmf/dvips/config/
> > /usr/share/texmf/tex/generic/config/
> > /usr/share/texmf/tex/platex/config/
> > /usr/share/texmf/xdvi/ /var/qmail/control"
> > CONFIG_PROTECT_MASK="/etc/gconf /etc/terminfo
> > /etc/env.d"
> > CXXFLAGS="-O3 -march=athlon-xp -pipe
> > -fprefetch-loop-arrays -funroll-loops -fPIC
> > -maccumulate-outgoing-args -minline-all-stringops
> > -mfpmath=sse "
> > DISTDIR="/usr/portage/distfiles"
> > FEATURES="autoaddcvs ccache sandbox"
> > GENTOO_MIRRORS="http://gentoo.oregonstate.edu
> >
>
http://distro.ibiblio.org/pub/Linux/distributions/gentoo"
> > MAKEOPTS="-j2"
> > PKGDIR="/usr/portage/packages"
> > PORTAGE_TMPDIR="/var/tmp"
> > PORTDIR="/usr/portage"
> > PORTDIR_OVERLAY=""
> > SYNC="rsync://rsync.gentoo.org/gentoo-portage"
> > USE="3dnow apm audiofile berkdb cdr cjk directfb
> doc
> > emacs encode esd foomaticdb gdbm gnome gpm gtk
> gtk2
> > guile imlib ipv6 java libg++ libwww mad memlimit
> > mikmod mmx mozilla mpeg ncurses oggvorbis opengl
> oss
> > python readline slang spell sse ssl svga tcpd
> tetex
> > truetype x86 xml2 zlib"
> >
> > thanks in advance.
> >
> >
> >
> >
> >
> >
> >
>
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