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Optimal performance compiler flags

jpburke
Beginner
‎02-27-2012 01:20 PM
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Hello - Can someone suggest the optimal performance compiler flags for 2nd gen i7 using GCC4.6.1 and the latest ICC Composer 12.1.3 ? I need to create 32 bit and 64 bit executables to run on Linux.

For GCC, I'm using -O3 -march=corei7-avx -mtune=corei7-avx

For ICC, -O3 -fast -march=corei7-avx -mkl -ipp

Any suggestions would be appreciated.

Thanks - JB
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styc
Beginner
‎02-27-2012 01:50 PM
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How about enable cross-file optimization with -flto for GCC and -ipo for ICC?
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xunxun
Beginner
‎03-01-2012 07:29 AM
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GCC can use

Compiler Option:

-Ofast -march=native -fomit-frame-pointer -minline-all-stringops -malign-double -ftree-vectorize
-ftree-loop-linear -fgraphite-identity -floop-interchange -floop-block -floop-parallelize-all -fforce-addr
-flto -ftree-parallelize-loops=n (n is your core numbers)

Linker Option

-flto -fuse-linker-plugin -lgomp -lpthread -Wl,-O1 -Wl,--as-needed -Wl,-s
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