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

[Dennis Luehring <dl.soluz@gmx.net>]

Am 20.08.2015 um 19:19 schrieb Richard Henderson:
> This isn't surprising, because at the moment tcg optimizations are almost
> completely ineffective for sparc.  The way the register windows are implemented
> means that there are very few proper tcg temporaries to optimize.
>
> I've just updated an old branch that attempts to cure this.  It creates proper
> tcg temporaries for the windowed registers, and uses a bit of recursion to find
> the place at which they should be stored.
>
>     git://github.com/rth7680/qemu.git  tcg-indirect
>
> With a few quick unscientific tests, it appears to help.  It would be nice to
> put that branch side-by-side with your tests above.

tcg-indirect seems not to improve (stream test degrades even more)

without-optimization means qemu.org-git + undefine USE_TCG_OPTIMIZATIONS

git clone git://github.com/rth7680/qemu.git
cd qemu
git checkout tcg-indirect

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)

gcc prime.c -o prime.out -lm

prime.out runtime

tcg-indirect: ~9.3 sec (best result)
qemu.org-git: ~11 sec
without-optimization: ~9.9 sec (worst result)

stream results (STREAM version $Revision: 5.10 $)

tcg-indirect: (worst result)

Your clock granularity/precision appears to be 41 microseconds.
Each test below will take on the order of 632527 microseconds.
    (= 15427 clock ticks)
Function    Best Rate MB/s  Avg time     Min time     Max time
Copy:             320.8     0.511297     0.498785     0.590214
Scale:            187.0     0.858693     0.855465     0.863527
Add:              218.2     1.104654     1.099698     1.110341
Triad:            169.5     1.433273     1.416321     1.502248

qemu.org-git: (best result)

Your clock granularity/precision appears to be 42 microseconds.
Each test below will take on the order of 330428 microseconds.
     (= 7867 clock ticks)
Function    Best Rate MB/s  Avg time     Min time     Max time
Copy:             771.5     0.214717     0.207377     0.244214
Scale:            288.1     0.573320     0.555401     0.660161
Add:              423.5     0.633523     0.566661     1.092067
Triad:            242.9     1.053032     0.987970     1.499563

without-optimization:

Your clock granularity/precision appears to be 41 microseconds.
Each test below will take on the order of 745254 microseconds.
    (= 18176 clock ticks)
Function    Best Rate MB/s  Avg time     Min time     Max time
Copy:             316.6     0.524065     0.505313     0.580103
Scale:            200.5     0.813356     0.798024     0.840986
Add:              243.9     1.010247     0.984025     1.119149
Triad:            182.9     1.345601     1.312236     1.427459