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Old 22 March 2014, 21:47   #1
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FS-UAE speed VS WinUAE


I'm using winuae, and just tried FSUAE, because I also have a mac.

It seems that FSUAE is a LOT slower (not gaming, workbench and productivity on a 040 config). I can't compare PC winuae and mac fsaue directly because they are not the same machines, but they use similar CPUs. The speed ratio (sysinfo figures) between the 2 is 30-100 at least.

If I disable JIT on winuae, I get a similar slowness.

The problem is that I've read that fs-uae mac was JIT enabled. Really don't understand.

Any clue ?
Old 22 March 2014, 23:15   #2
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You must enable JIT in FS-UAE by set "uae_cachesize = 8192" in custom settings I believe to remember
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Old 23 March 2014, 11:26   #3
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Great I got a fantastic speed improvement ! Need to check if it's as fast as winuae on the windows machine.

IMHO this should be added on a config screen, as it's a very important setting

Thanks a lot

One weird thing still : I have 2 virtual machines
- my old 3.1 setup coming from my A4k
- a "new" 3.9

while this setting does something on the 3.9 machine, it does not on the 3.1 ???

Last edited by TCD; 23 March 2014 at 12:05.
Old 23 March 2014, 14:42   #4
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Perhaps the 3.1 one uses the A1200 model (cycle exact)? If not, please provide fs-uae.log.txt after having run and quit the 3.1 config.
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Old 24 March 2014, 10:46   #5
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I'll do.

I did some more FSUAE/WINUAE tests on the windows host, with sysinfo aand AIBB (yes it's old) on the 3.9 setup, using the uae_configsize option of course.

Emulated machine is a 4k/40 with P96

Sysinfo :
  • WINUAE : Mips 395 Flops 975
  • FS-UAE : Mips 494 Flops 438
AIBB vs A4000-40 :
  • WINUAE : Int 161x, Gfx 52x, FP 74x
  • FS-UAE : Int 44x, Gfx 0.8x (!), FP 38x
Results are consistent if run the tests again after a reboot. And visually, the winuae VM seems to run faster in everyday use.

Seems like there is still room for improvement in all parts especially Gfx, I don't see where the difference comes from since the core code comes from winuae ?
Attached Files
File Type: zip fs-uae.log.txt.zip (10.9 KB, 100 views)

Last edited by Kador; 24 March 2014 at 11:24.
Old 24 March 2014, 20:45   #6
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Hi, it's known that FS-UAE currently runs Amiga in "fastest-possible-mode" slower than WinUAE.

See this post http://eab.abime.net/showpost.php?p=930360&postcount=31 (or the entire thread for that matter) for some more information on the matter.

It does not mean that the emulation itself is slower. It's most likely timing issues (due to the fastest-possible mode getting less attention than game support). When running games at 68000 and 68020 speeds, performance should be good.
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Old 25 March 2014, 10:17   #7
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I understand. For that matter, can't you just use the winaue code "as it" ? Besides, the grafics difference in aibb and visually are huge, and can't be only related to timing issues (52x A4000 on winuae, 0.8x on fsuae !!), am I wrong ?

Last edited by Kador; 25 March 2014 at 10:23.
Old 11 May 2014, 15:50   #8
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Please try to fix the code at it is and then you can again give it a try.

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