Compiling Nginx with GCC Optimization Flags

[Joe Aston]

Thank you! I would still appreciate hearing anyone else's results also.

On Tue, Dec 2, 2008 at 9:21 AM, Igor Sysoev <is at rambler-co.ru> wrote:

> On Mon, Dec 01, 2008 at 08:49:29PM +0000, Joe Aston wrote:
>
> > Has anyone done any testing on the optimum GCC compiler flags for
> compiling
> > Nginx?
> >
> > I usually use "-O3 -march=core2 -msse -mmmx -msse2 -msse3 -mfpmath=sse
> > -fomit-frame-pointer", but would it be worthwhile using "-funroll-loops"
> or
> > other options? Would "-O2" be better?
>
> As it was said there is no noticeable difference between -O and -O2
> for nginx. I believe -funroll-loops is useless for nginx: nginx has no
> long loops to unroll. For the same reason mmx/sse is useless too:
> I saw that Intel C compiler uses them in some loops, but all of them
> are short and run once on re/configuration phase only.
>
> -fomit-frame-pointer is single usefull option, but I do not use it usually
> as it makes almost impossible to investigate core dumps.
>
> > Has anyone compiled Nginx with the Intel C/C++ Compiler? If so, what
> > settings did you use?
>
> nginx has support for Intel C/C++ Compiler.
> It runs with "-O -Ob2 -ip" options.
>
>
> --
> Igor Sysoev
> http://sysoev.ru/en/
>
>
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