[leejearl]

Hi, all:
I found that the default option of CXXFLAGS is "-g -O2", and the default option of LDFLAGS is none. In my viewpoint, the option "-g" might reduce the efficiency of the programs. Is there any example of options which can
improve the computational efficiency of SU2?

Thanks.

[talbring]

You can change the compiler flags using

export CXXFLAGS="-O3"

before you run the configure script.

[leejearl]

Originally Posted by talbring

You can change the compiler flags using

export CXXFLAGS="-O3"

before you run the configure script.

I build SU2 following your advice, but it hardly improve the efficiency of SU2.

[hectorgabriel85]

Originally Posted by leejearl

Hi, all:
I found that the default option of CXXFLAGS is "-g -O2", and the default option of LDFLAGS is none. In my viewpoint, the option "-g" might reduce the efficiency of the programs. Is there any example of options which can
improve the computational efficiency of SU2?

Thanks.

What about
export CXXFLAGS="-O3 -march=native"
Does that increase its performance? Are you running in a processor with AVX or AVX2?

[pcg]

SU2 gets its versatility from polymorphism, that unfortunately rules out many optimizations, and so the difference between O2 and O3 is not great. (-g only serves to keep debugging symbols in the binaries, I do not think it changes the optimization level).
That being said, the current development version is able to use MKL to accelerate the solution of linear systems, you can find more information here:
https://github.com/su2code/SU2/pull/543