Re: [Qemu-devel] Debian 7.8.0 SPARC64 on qemu - anything i can do to speedup the emulation?

[Dennis Luehring]

Am 21.08.2015 um 17:47 schrieb Richard Henderson:
> On 08/20/2015 11:05 PM, Dennis Luehring wrote:
> >> > g++ src/pugixml.cpp -g -Wall -Wextra -Werror -pedantic -std=c++0x -c -MMD 
> -MP
> >> >
> >> > tcg-indirect: ~2:46.5
> >> > qemu.org-git: ~2:51.2 (worst result)
> >> > without-optimization: ~2:14.1 (best result)
> >>
> >> No compiler optimization?  I wouldn't expect there to be much for tcg to
> >> optimize there -- dropping values to memory all the time doesn't leave much.
> >
> >
> > without-optimization means qemu.org-git release build + undefine
> > USE_TCG_OPTIMIZATIONS in tcg/tcg.c
> > or what compiler do you mean?
>
> The one for compiling the benchmark: g++ -O2.


for the overall speed comparision it  is not relevant if its -O0, -O2 or -O3
as long as all my test using always the same optimization

> >> These results are weird.  Unoptimized less than half the speed of mainline?
> >> Improving optimization (with no extra work, mind) brings the results back 
> down?
> >
> >
> > yep they are - it seems that the assumption of the involved developers
> > where speed can be improved / or slowbess comes from is not correct
> > how are SPARC64 benchmarks done usually?
>
> *shrug* No different than any other..

so what benchmarks are in use?
are there any download/compile/installable around
some sort of default qemu performance tests?

> .
>
>
> r~