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经验谈：如何使你的系统达到最优化？
1、检查你的gcc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。 |
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