CFLAGS Central (Part 1)

Message

AutoBot · Post by **AutoBot** » Fri Jun 21, 2002 2:18 pm

I was just curious as to what everyone is using for there CFLAGS, and have you had any issues from them, stability problems, random crashes, etc...etc...

My system was compiled with the following and I have had no problems arise yet:

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CFLAGS="-march=i686 -O3 -pipe -fforce-addr -fomit-frame-pointer -funroll-loops -frerun-loop-opt -frerun-cse-after-loop -falign-functions=4"

[edited only to change thread title - rac]

DArtagnan · Post by **DArtagnan** » Fri Jun 21, 2002 2:37 pm

I have P2 300 Mhz 256 RAM and my CFLAGS are:
# Pentium Pro/Pentium II/Pentium III+/Pentium 4/Athlon optimized (but binaries
# will run on any x86 system)
CHOST="i686-pc-linux-gnu"
CFLAGS="-mcpu=i686 -O3 -pipe"
CXXFLAGS="-mcpu=i686 -O3 -pipe"

My system is a little slow...do you thing your flags can make my system faster?

delta407 · Post by **delta407** » Fri Jun 21, 2002 2:39 pm

I'm very stable with -mcpu=i686 -O3 -pipe -fomit-frame-pointer, and quite happy with the performance.

DArtagnan · Post by **DArtagnan** » Fri Jun 21, 2002 2:40 pm

what computer?

delta407 · Post by **delta407** » Fri Jun 21, 2002 2:43 pm

That's my desktop. Production servers running Gentoo are equally conservative, though, and have good uptimes (i.e. reboot only for new kernels every 6 weeks or so).

S_aIN_t · Post by **S_aIN_t** » Fri Jun 21, 2002 2:43 pm

hmm. those are some interesting options.. thanks AutoBot.. i will try to rebuild my system with the flags you are using..

hopefully nothing will break..

i am also considering installing gcc-3.1 and rebuilding with that.. but that is another day.

AutoBot · Post by **AutoBot** » Fri Jun 21, 2002 2:47 pm

That was the reason I started this thread, to give people an idea of what flags can be used without breaking things

AutoBot · Post by **AutoBot** » Fri Jun 21, 2002 2:48 pm

pacman wrote:I have P2 300 Mhz 256 RAM and my CFLAGS are:
# Pentium Pro/Pentium II/Pentium III+/Pentium 4/Athlon optimized (but binaries
# will run on any x86 system)
CHOST="i686-pc-linux-gnu"
CFLAGS="-mcpu=i686 -O3 -pipe"
CXXFLAGS="-mcpu=i686 -O3 -pipe"

My system is a little slow...do you thing your flags can make my system faster?

You would gain some speed for sure by adding:

Code: Select all

-fomit-frame-pointer

DArtagnan · Post by **DArtagnan** » Fri Jun 21, 2002 2:50 pm

AutoBot wrote:
pacman wrote:I have P2 300 Mhz 256 RAM and my CFLAGS are:
# Pentium Pro/Pentium II/Pentium III+/Pentium 4/Athlon optimized (but binaries
# will run on any x86 system)
CHOST="i686-pc-linux-gnu"
CFLAGS="-mcpu=i686 -O3 -pipe"
CXXFLAGS="-mcpu=i686 -O3 -pipe"

My system is a little slow...do you thing your flags can make my system faster?
You would gain some speed for sure by adding:
Code: Select all
-fomit-frame-pointer

Like that?

CHOST="i686-pc-linux-gnu -fomit-frame-pointer"
CFLAGS="-mcpu=i686 -O3 -pipe -fomit-frame-pointer"
CXXFLAGS="-mcpu=i686 -O3 -pipe -fomit-frame-pointer"

delta407 · Post by **delta407** » Fri Jun 21, 2002 2:55 pm

No, see, you don't put optimizations in your CHOST line...

DArtagnan · Post by **DArtagnan** » Fri Jun 21, 2002 2:57 pm

delta407 wrote:No, see, you don't put optimizations in your CHOST line...

As you said i have no clue of those flags so it seems to be:
CHOST="i686-pc-linux-gnu"
CFLAGS="-mcpu=i686 -O3 -pipe -fomit-frame-pointer"
CXXFLAGS="-mcpu=i686 -O3 -pipe -fomit-frame-pointer"

How it can help my P2?

Or i can use?
CHOST="i686-pc-linux-gnu"
CFLAGS="-mcpu=i686 -O3 -pipe"
CXXFLAGS="-mcpu=i686 -O3 -pipe"

Help

delta407 · Post by **delta407** » Fri Jun 21, 2002 3:00 pm

Optimizations go on the CFLAGS/CXXFLAGS lines. BTW, -fomit-frame-pointer frees up an extra register, which gives the processor more room to play with numbers without having to touch the RAM. This gives many apps a big performance increase.

DArtagnan · Post by **DArtagnan** » Fri Jun 21, 2002 3:03 pm

Now I'm really confused because of you

CHOST="i686-pc-linux-gnu"
CFLAGS="-mcpu=i686 -O3 -pipe -fomit-frame-pointer"
CXXFLAGS="-mcpu=i686 -O3 -pipe -fomit-frame-pointer"

CHOST="i686-pc-linux-gnu"
CFLAGS="-mcpu=i686 -O3 -pipe"
CXXFLAGS="-mcpu=i686 -O3 -pipe"

make my day :p

AutoBot · Post by **AutoBot** » Fri Jun 21, 2002 3:08 pm

pacman wrote:Now I'm really confused because of you

CHOST="i686-pc-linux-gnu"
CFLAGS="-mcpu=i686 -O3 -pipe -fomit-frame-pointer"
CXXFLAGS="-mcpu=i686 -O3 -pipe -fomit-frame-pointer"

CHOST="i686-pc-linux-gnu"
CFLAGS="-mcpu=i686 -O3 -pipe"
CXXFLAGS="-mcpu=i686 -O3 -pipe"

make my day :p

This is correct pacman:

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CHOST="i686-pc-linux-gnu" 
CFLAGS="-mcpu=i686 -O3 -pipe -fomit-frame-pointer" 
CXXFLAGS="-mcpu=i686 -O3 -pipe -fomit-frame-pointer"

And if you want to recompile your entire system do the following:

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emerge gentoolkit  #only if you dont currently have it
qpkg -nc -I | sort | uniq | NOCOLOR=true xargs emerge 2>&1 >qpkg-make.log

DArtagnan · Post by **DArtagnan** » Fri Jun 21, 2002 3:12 pm

Please lemme know what this line does

qpkg -nc -I | sort | uniq | NOCOLOR=true xargs emerge 2>&1 >qpkg-make.log

AutoBot · Post by **AutoBot** » Fri Jun 21, 2002 3:18 pm

Recompiles your entire system with the new flags you have set in /etc/make.conf

DArtagnan · Post by **DArtagnan** » Fri Jun 21, 2002 3:21 pm

Code: Select all

emerge gentoolkit  #only if you dont currently have it 
qpkg -nc -I | sort | uniq | NOCOLOR=true xargs emerge 2>&1 >qpkg-make.log

Really? Then "emerge -e world" does what?
How long it can take?

AutoBot · Post by **AutoBot** » Fri Jun 21, 2002 3:27 pm

Ah it would appear with the new portage that emerge -e world does indeed work correctly now, so disreguard and use it instead.

DArtagnan · Post by **DArtagnan** » Fri Jun 21, 2002 3:29 pm

Now , after I know that i need to run "emerge -e world", how long it will take?

AutoBot · Post by **AutoBot** » Fri Jun 21, 2002 3:38 pm

If you have KDE installed (I know you do), well over 24hours judging by your processor.

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time emerge -e world
#let me know how it goes :D

DArtagnan · Post by **DArtagnan** » Fri Jun 21, 2002 3:40 pm

24 Hours?
You wanna my girlfriend to kill me?

DArtagnan · Post by **DArtagnan** » Fri Jun 21, 2002 3:45 pm

AutoBot wrote:If you have KDE installed (I know you do), well over 24hours judging by your processor.
Code: Select all
time emerge -e world
#let me know how it goes :D

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I entered "emerge -e world" without the "p" flag and it already started to grab source from net :-)

# time emerge -pe world

These are the packages that I would merge, in order.

Calculating world dependencies ...done!
[ebuild  N   ] sys-apps/cronbase-0.01 to /
[ebuild  N   ] sys-apps/groff-1.17.2-r1 to /
...
... to long...
...
[ebuild  N   ] dev-util/cscope-15.3 to /
[ebuild  N   ] app-editors/vim-6.1-r7 to /


real    0m30.437s
user    0m11.241s
sys     0m0.154s

AutoBot · Post by **AutoBot** » Fri Jun 21, 2002 3:52 pm

Lol I meant let me know how it goes after you re-compile everything.

DArtagnan · Post by **DArtagnan** » Fri Jun 21, 2002 3:53 pm

Ma man ,
I'll kick your ass but u're lucky cuz i like ya

Ok, I'll tell ya

DArtagnan · Post by **DArtagnan** » Fri Jun 21, 2002 3:59 pm

pacman wrote:24 Hours?
You wanna my girlfriend to kill me?

I promised her that I'll finish as fast as possible to re-compile every thing...

What is more difficult? Gentoo or your woman?