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Mandr4ke
Apprentice
Joined: 25 Jul 2002
Posts: 214
Location: Chicago, IL
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 Posted: Sun Jul 28, 2002 11:43 pm Post subject: gcc compile question... Optimizations per Processor |
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Hi, After about 3 Days and 20-30 recompiles i have finally joined the Gentoo Community with a working from scratch install.. YAY *does a little dance* .. =)
Anyways i was courious.. i'm compiling X and KDE now.. and i noticed when it's compiling it's only using the -march=i686 -03 -pipe with all the compiling... The same when i compiled the kernel..
I have an Athlon XP 1700 CPU and i've see some stuff about using
-athlon-xp -mmx -3dnow -sse and stuff..
My Questions are
1. with out these optimizations is my stuff going to run like dog slow.. another is..
2.how excatly do i go about using these parameters to make FULL use of my processor.. I did try to put a couple of these is the USE "" but that didn't seem to work.. and i'm a little lost on this part.. and after 30 re-compiles my brain feels a little tired.. hehe
Thanks for any help!! |
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tkdack
n00b
Joined: 12 Apr 2002
Posts: 44
Location: Sydney, Australia
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| Posted: Mon Jul 29, 2002 1:11 am Post subject: Re: gcc compile question... Optimizations per Processor |
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| Mandr4ke wrote: | | Hi, After about 3 Days and 20-30 recompiles i have finally joined the Gentoo Community with a working from scratch install.. YAY *does a little dance* .. =) |
Congratulations
| Mandr4ke wrote: | Anyways i was courious.. i'm compiling X and KDE now.. and i noticed when it's compiling it's only using the -march=i686 -03 -pipe with all the compiling... The same when i compiled the kernel..
I have an Athlon XP 1700 CPU and i've see some stuff about using
-athlon-xp -mmx -3dnow -sse and stuff..
My Questions are
1. with out these optimizations is my stuff going to run like dog slow.. another is.. |
Nope, it should run OK, just not optimal, although -O3 is a reasonable level of optimisation.
| Mandr4ke wrote: |
2.how excatly do i go about using these parameters to make FULL use of my processor.. I did try to put a couple of these is the USE "" but that didn't seem to work.. and i'm a little lost on this part.. and after 30 re-compiles my brain feels a little tired.. hehe
Thanks for any help!! |
Those particular optimisations will only work if you have installed a system from a 1.3x iso or if you upgraded a 1.{0,1,2} install.
To use the athlon-xp specific compiler optimisations you need to be using GCC-3.1.
The place to put all these things is in /etc/make.conf this file is fairly well commented so you shouldn't have too many problems.
Also look at
for more information on the switches you can pass to the compiler.
_________________
Troy
http://linux.tkdack.com
Former Gentoo contributor TaD |
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nbensa
l33t
Joined: 10 Jul 2002
Posts: 799
Location: Buenos Aires, Argentina
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| Posted: Mon Jul 29, 2002 1:45 am Post subject: Re: gcc compile question... Optimizations per Processor |
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| Mandr4ke wrote: | | I did try to put a couple of these is the USE "" but that didn't seem to work.. |
No. You should use CFLAGS for CPU optimizations.
Read /etc/make.conf, everything is in there.
HTH,
Norberto |
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Mandr4ke
Apprentice
Joined: 25 Jul 2002
Posts: 214
Location: Chicago, IL
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| Posted: Mon Jul 29, 2002 2:30 am Post subject: Ahh ok |
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Ahh ic,, thanks, i'm currently using the 1.2 r7 Release.. not gcc 3.0, so that would explain why.. so i guess for my system it's optimal then.. yay..
=)
Just hope X/KDE finish's it's install soon, it's been over 2 hours now.. daaaaam.. hehe |
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