Linux優化經驗

 經驗談：如何使你的系統達到最優化？

1、檢查你的gclearcase/" target="_blank" >cc版本：

#gcc --version

2、獲取你的cpu的型號：

cat /proc/cpuinfo

3、在/etc/下建立make.conf文件，并根據cpu的型號寫入不同內容。注意你的gcc版本必須在3.0以上。
i386 (Intel)：

CHOST=\"i386-pc-linux-gnu\"
CFLAGS=\"-march=i386 -O3 -pipe -fomit-frame-pointer\"
CXXFLAGS=\"-march=i386 -O3 -pipe -fomit-frame-pointer\"

i486 (Intel)：

CHOST=\"i486-pc-linux-gnu\"
CFLAGS=\"-march=i486 -O3 -pipe -fomit-frame-pointer\"
CXXFLAGS=\"-march=i486 -O3 -pipe -fomit-frame-pointer\"

Pentium 1 (Intel)

CHOST=\"i586-pc-linux-gnu\"
CFLAGS=\"-march=pentium -O3 -pipe -fomit-frame-pointer\"
CXXFLAGS=\"-march=pentium -O3 -pipe -fomit-frame-pointer\"

Pentium MMX (Intel)

CHOST=\"i586-pc-linux-gnu\"
CFLAGS=\"-march=pentium-mmx -O3 -pipe -fomit-frame-pointer\"
CXXFLAGS=\"-march=pentium-mmx -O3 -pipe -fomit-frame-pointer\"

Pentium PRO (Intel)

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

Pentium II (Intel)

CHOST=\"i686-pc-linux-gnu\"
CFLAGS=\"-march=pentium2 -O3 -pipe -fomit-frame-pointer\"
CXXFLAGS=\"-march=pentium2 -O3 -pipe -fomit-frame-pointer\"

Celeron (Mendocino), aka Celeron1 (Intel)

CHOST=\"i686-pc-linux-gnu\"
CFLAGS=\"-march=pentium2 -O3 -pipe -fomit-frame-pointer\"
CXXFLAGS=\"-march=pentium2 -O3 -pipe -fomit-frame-pointer\"

Pentium III (Intel)

CHOST=\"i686-pc-linux-gnu\"
CFLAGS=\"-march=pentium3 -O3 -pipe -fomit-frame-pointer\"
CXXFLAGS=\"-march=pentium3 -O3 -pipe -fomit-frame-pointer\"

Celeron (Coppermine) aka Celeron2 (Intel)

CHOST=\"i686-pc-linux-gnu\"
CFLAGS=\"-march=pentium3 -O3 -pipe -fomit-frame-pointer\"
CXXFLAGS=\"-march=pentium3 -O3 -pipe -fomit-frame-pointer\"

Celeron (Willamette?) (Intel)

CHOST=\"i686-pc-linux-gnu\"
CFLAGS=\"-march=pentium4 -O3 -pipe -fomit-frame-pointer\"
CXXFLAGS=\"-march=pentium4 -O3 -pipe -fomit-frame-pointer\"

Pentium 4 (Intel)

CHOST=\"i686-pc-linux-gnu\"
CFLAGS=\"-march=pentium4 -O3 -pipe -fomit-frame-pointer\"
CXXFLAGS=\"-march=pentium4 -O3 -pipe -fomit-frame-pointer\"

Eden C3/Ezra (Via)

CHOST=\"i586-pc-linux-gnu\"
CFLAGS=\"-march=i586 -m3dnow -O3 -pipe -fomit-frame-pointer\"
CXXFLAGS=\"-march=i586 -m3dnow -O3 -pipe -fomit-frame-pointer\"

K6 (AMD)

CHOST=\"i586-pc-linux-gnu\"
CFLAGS=\"-march=k6 -O3 -pipe -fomit-frame-pointer\"
CXXFLAGS=\"-march=k6 -O3 -pipe -fomit-frame-pointer\"

K6-2 (AMD)

CHOST=\"i586-pc-linux-gnu\"
CFLAGS=\"-march=k6-2 -O3 -pipe -fomit-frame-pointer\"
CXXFLAGS=\"-march=k6-2 -O3 -pipe -fomit-frame-pointer\"

K6-3 (AMD)

CHOST=\"i586-pc-linux-gnu\"
CFLAGS=\"-march=k6-3 -O3 -pipe -fomit-frame-pointer\"
CXXFLAGS=\"-march=k6-3 -O3 -pipe -fomit-frame-pointer\"

Athlon (AMD)

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

Athlon-tbird, aka K7 (AMD)

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

Athlon-tbird XP (AMD)

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

Athlon 4(AMD)

CHOST=\"i686-pc-linux-gnu\"
CFLAGS=\"-march=athlon-4 -O3 -pipe -fomit-frame-pointer\"
CXXFLAGS=\"-march=athlon-4 -O3 -pipe -fomit-frame-pointer\"

Athlon XP (AMD)

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

Athlon MP (AMD)

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

603 (PowerPC)

CHOST=\"powerpc-unknown-linux-gnu\"
CFLAGS=\"-O3 -pipe -fsigned-char\"
CXXFLAGS=\"-O3 -pipe -fsigned-char\"

603e (PowerPC)

CHOST=\"powerpc-unknown-linux-gnu\"
CFLAGS=\"-O3 -pipe -fsigned-char\"
CXXFLAGS=\"-O3 -pipe -fsigned-char\"

604 (PowerPC)

CHOST=\"powerpc-unknown-linux-gnu\"
CFLAGS=\"-O3 -pipe -fsigned-char\"
CXXFLAGS=\"-O3 -pipe -fsigned-char\"

604e (PowerPC)

CHOST=\"powerpc-unknown-linux-gnu\"
CFLAGS=\"-O3 -pipe -fsigned-char\"
CXXFLAGS=\"-O3 -pipe -fsigned-char\"

750 aka as G3 (PowerPC)

CHOST=\"powerpc-unknown-linux-gnu\"
CFLAGS=\"-mcpu=750 -O3 -pipe -fsigned-char -mpowerpc-gfxopt\"
CXXFLAGS=\"-mcpu=750 -O3 -pipe -fsigned-char -mpowerpc-gfxopt\"

7400, aka G4 (PowerPC)

CHOST=\"powerpc-unknown-linux-gnu\"
CFLAGS=\"-mcpu=7400 -O2 -pipe -fsigned-char -maltivec
-mabi=altivec -mpowerpc-gfxopt\"
CXXFLAGS=\"-mcpu=7400 -O2 -pipe -fsigned-char -maltivec
-mabi=altivec -mpowerpc-gfxopt\"
-fsigned-char -maltivec -mabi=altivec -mpowerpc-gfxopt\"

7450, aka G4 second generation (PowerPC)

CHOST=\"powerpc-unknown-linux-gnu\"
CFLAGS=\"-mcpu=7450 -O2 -pipe -fsigned-char
-maltivec -mabi=altivec -mpowerpc-gfxopt\"
CXXFLAGS=\"-mcpu=7450 -O2 -pipe -fsigned-char
-maltivec -mabi=altivec -mpowerpc-gfxopt\"


PowerPC (If you don\'t know which one)

CHOST=\"powerpc-unknown-linux-gnu\"
CFLAGS=\"-O3 -pipe -fsigned-char -mpowerpc-gfxopt\"
CXXFLAGS=\"-O3 -pipe -fsigned-char -mpowerpc-gfxopt\"

Sparc

CHOST=\"sparc-unknown-linux-gnu\"
CFLAGS=\"-O3 -pipe -fomit-frame-pointer\"
CXXFLAGS=\"-O3 -pipe -fomit-frame-pointer\"

Sparc 64

CHOST=\"sparc64-unknown-linux-gnu\"
CFLAGS=\"-O3 -pipe -fomit-frame-pointer\"
CXXFLAGS=\"-O3 -pipe -fomit-frame-pointer\"


好了，這樣做后你編譯出的程序運行效率將比以前高很多！只要你有時間，你可以把你的系統如redhat linux 9.0的源代碼（后綴.src.rpm）全部重新編譯一次，你會發現你的Redhat Linux系統將比原來快一大截！
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以上我在RedHat Linux 9.0及Mandrake Linux 9.1上通過并證明有效。

原文轉自：http://www.anti-gravitydesign.com