Linux优化经验

 经验谈：如何使你的系统达到最优化？

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

#gcc --version

2、获取你的cpu的型号：

cat /proc/cpuinfo

3、在/etc/下建立make.conf文件，并根据cpu的型号写入不同内容。注意你的gcc版本必须在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，这样做后你编译出的程序运行效率将比以前高很多！只要你有时间，你可以把你的系统如redhat linux 9.0的源代码（后缀.src.rpm）全部重新编译一次，你会发现你的Redhat Linux系统将比原来快一大截！
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以上我在RedHat Linux 9.0及Mandrake Linux 9.1上通过并证明有效。

原文转自：http://www.ltesting.net