-march=pentium4 issue

[mapr]

Could it be enough to simply compile the glibc without optimization (' -O ') ? Or does that simply include a ' -mno-sse2 ' in addition to some other -mno*some-terrific-instruction-set* ??
Thanks
Mario

[bsolar]

[jo_vermeulen]

[m0sk]

[Paule]

I also had the same problem untill I upgraded to gcc 3.3.1 using these flags....

CFLAGS="-march=pentium4 -O3 -mmmx -msse -msse2 -mfpmath=sse -funroll-loops -fprefetch-loop-arrays -pipe"

I recompiled my whole system with "emerge -e world". Since I have recompiled, My system is noticably faster and EVERYTHING works perfectly. Hope this helps.


Paul

__________________________________________________________________________

- Man is not judged by his problems, but by the way in which he solves them.

[wishkah]

Compiled my whole system with --ffast-math -march=pentium4 -O3 and the above python-int-cast line works (doesn't give an error). But with 3.2.3 it's expected I guess...

BTW, give --ffast-math a try, it really increases performance (compiled the whole sys with it, no prob, but it MIGHT cause probs when used with apps that rely on very precise calculations)
_________________
if only I could fill my heart with love...

[jo_vermeulen]

[Paule]

[Beetle B.]

I'll be getting DSL in a few days, so I'll give this a go (virtually all my software was compiled with -march=pentium4, except some of the basic system ones).

I'm worried that this may create plenty of configuration files that "need updating" - does it? It would be a grand pain if it does.

Since most of my software was compiled with -march=pentium4, would it be the same if I just recompiled those programs that were compiled with -march=pentium3?

TIA,
_________________
Beetle B.

Please update the table of equivalents.
A Firefox guide.

[mexicangeek]

I installed my entire system with the PENTIUM4 setting, because there wasn't a warning in /etc/make.conf anymore. (As opposed to the previous RC_3 or 4 install). It wasn't until today when I upgraded protage that I noticed the addition to the make.conf warning of this problem. I think it would be nice to get a recomended solution and explaination from the gentoo team. Please don't misunderstand, I'm not upset about any mishap about the warning no longer being present in make.conf, but I would just like a recomended solution. I have seen posts in this thread about doing "emerge -e world". I have also seen posts state that there is no problem at all with using pentium4. I would like to know what to do, before I go through the process of re-installing my OS again.

P.S. Hey gentoo team...you guys rock!

[jo_vermeulen]

[totopo]

Does someone have expirience with these settings?

http://www.freehackers.org/gentoo/gccflags/flag_gcc3.html


Regards

[virtual]

Hi,
totopo

Yes those flags seem fine on my pentium 4 3.2GHz HT

But I switch between -Os and -O3 depending on what I compile. I compiled my system (emerge system) with -O3 settings to get the fastest code, accepting an increase in memory usage.

Then I switched to -Os when compiling the various kde packages and openoffice, here I want the executable to be as small as possible and I still get most of the -O2 optimizations, but not the ones that would increase my memory usage at runtime. I do this because kde apps. and openoffice are usualy just waiting for me to type something in a edit box or waiting for me to push a button (of course if I have long and complex fourmulas to calculate in the spreadsheet of openoffice this may change). My main concern here is startup time, I have also prelinked my whole system.

I am uncertain though if "-fomit-frame-pointer" is nessecary as it is implied by the -O flags anyway, but this may be a way to force it on even if the compiler disagrees when only using a -O flag.
_________________
The roots of education are bitter but it's fruit is sweet.

[totopo]

Hello, an AMD Sempron processor uses the same flags as AMD XP processor?

or which one should I use?

CHOST="i686-pc-linux-gnu"
CFLAGS="-march=athlon-xp -O3 -pipe -fomit-frame-pointer"
CXXFLAGS="-march=athlon-xp -O3 -pipe -fomit-frame-pointer"


Regards

totopo