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bgfx vulkan backend not really faster than opengl
#116305 10/31/19 06:53 PM
Joined: Mar 2004
Posts: 657
Germany
belegdol Offline OP
Senior Member
OP Offline
belegdol
Senior Member
Joined: Mar 2004
Posts: 657
Germany
Hello,

I have done some tests with git master and on my system the bgfx vulkan backend is not really faster than opengl one - it is faster than non-bgfx opengl though. This is quite in contrast to ~30 fold speedup RB was mentioning with GTX 1080. My system is equipped with an RTX 2070 and is running Fedora 31.
bgfx vulkan:
Code
$ ./mame64 -rompath /mnt/openmediavault/emu/mame/roms/ -window -nomaximize -video bgfx -bgfx_backend vulkan umk3 -sdlvideofps
  0.02s,    1 F, avrg game: 54.70 FPS 18.28 ms/f, avrg video: 9713.08 FPS 0.10 ms/f, last video:   inf FPS 0.05 ms/f
  1.02s,   56 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 11416.83 FPS 0.09 ms/f, last video:   inf FPS 0.06 ms/f
  2.03s,  111 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 11262.14 FPS 0.09 ms/f, last video:   inf FPS 0.05 ms/f
  3.03s,  166 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 12902.32 FPS 0.08 ms/f, last video:   inf FPS 0.05 ms/f
  4.04s,  221 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 13949.67 FPS 0.07 ms/f, last video:   inf FPS 0.05 ms/f
  5.05s,  276 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 14693.42 FPS 0.07 ms/f, last video:   inf FPS 0.05 ms/f
  6.05s,  331 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 15231.93 FPS 0.07 ms/f, last video:   inf FPS 0.05 ms/f
  7.06s,  386 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 15622.80 FPS 0.06 ms/f, last video:   inf FPS 0.06 ms/f
  8.06s,  441 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 15902.47 FPS 0.06 ms/f, last video:   inf FPS 0.05 ms/f
  9.07s,  496 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 16151.91 FPS 0.06 ms/f, last video:   inf FPS 0.05 ms/f
 10.07s,  551 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 16362.50 FPS 0.06 ms/f, last video:   inf FPS 0.05 ms/f
 11.08s,  606 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 16483.35 FPS 0.06 ms/f, last video:   inf FPS 0.05 ms/f
 12.08s,  661 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 16670.53 FPS 0.06 ms/f, last video:   inf FPS 0.05 ms/f
 13.09s,  716 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 16799.59 FPS 0.06 ms/f, last video:   inf FPS 0.05 ms/f
 14.09s,  771 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 16933.72 FPS 0.06 ms/f, last video:   inf FPS 0.05 ms/f
 15.10s,  826 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 16994.24 FPS 0.06 ms/f, last video:   inf FPS 0.05 ms/f
 16.10s,  881 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 17045.69 FPS 0.06 ms/f, last video:   inf FPS 0.06 ms/f
 17.11s,  936 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 17126.95 FPS 0.06 ms/f, last video:   inf FPS 0.06 ms/f
 18.11s,  991 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 17222.62 FPS 0.06 ms/f, last video:   inf FPS 0.05 ms/f
 19.12s, 1046 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 17282.82 FPS 0.06 ms/f, last video:   inf FPS 0.05 ms/f
Average speed: 100.00% (19 seconds)

bgfx opengl:
Code
$ ./mame64 -rompath /mnt/openmediavault/emu/mame/roms/ -window -nomaximize -video bgfx -bgfx_backend opengl umk3 -sdlvideofps
  0.02s,    1 F, avrg game: 54.69 FPS 18.29 ms/f, avrg video: 12423.75 FPS 0.08 ms/f, last video:   inf FPS 0.04 ms/f
  1.02s,   56 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 23462.81 FPS 0.04 ms/f, last video:   inf FPS 0.04 ms/f
  2.03s,  111 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 23951.68 FPS 0.04 ms/f, last video:   inf FPS 0.04 ms/f
  3.03s,  166 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 23751.12 FPS 0.04 ms/f, last video:   inf FPS 0.04 ms/f
  4.04s,  221 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 23580.58 FPS 0.04 ms/f, last video:   inf FPS 0.04 ms/f
  5.05s,  276 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 20869.75 FPS 0.05 ms/f, last video:   inf FPS 0.03 ms/f
  6.05s,  331 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 21497.07 FPS 0.05 ms/f, last video:   inf FPS 0.04 ms/f
  7.06s,  386 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 22042.05 FPS 0.05 ms/f, last video:   inf FPS 0.04 ms/f
  8.06s,  441 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 22386.92 FPS 0.04 ms/f, last video:   inf FPS 0.03 ms/f
  9.07s,  496 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 22647.45 FPS 0.04 ms/f, last video:   inf FPS 0.04 ms/f
 10.07s,  551 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 22781.78 FPS 0.04 ms/f, last video:   inf FPS 0.03 ms/f
 11.08s,  606 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 22819.63 FPS 0.04 ms/f, last video:   inf FPS 0.10 ms/f
 12.08s,  661 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 22979.21 FPS 0.04 ms/f, last video:   inf FPS 0.03 ms/f
 13.09s,  716 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 23045.63 FPS 0.04 ms/f, last video:   inf FPS 0.03 ms/f
 14.09s,  771 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 23188.50 FPS 0.04 ms/f, last video:   inf FPS 0.04 ms/f
 15.10s,  826 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 23204.76 FPS 0.04 ms/f, last video:   inf FPS 0.04 ms/f
Average speed: 100.00% (16 seconds)

non-bgfx opengl:
Code
$ ./mame64 -rompath /mnt/openmediavault/emu/mame/roms/ -window -nomaximize -video opengl umk3 -sdlvideofps
  0.02s,    1 F, avrg game: 54.72 FPS 18.27 ms/f, avrg video: 3456.94 FPS 0.29 ms/f, last video:   inf FPS 0.14 ms/f
  1.02s,   56 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 6689.12 FPS 0.15 ms/f, last video:   inf FPS 0.15 ms/f
  2.03s,  111 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 6581.31 FPS 0.15 ms/f, last video:   inf FPS 0.15 ms/f
  3.03s,  166 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 6571.33 FPS 0.15 ms/f, last video:   inf FPS 0.15 ms/f
  4.04s,  221 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 6471.70 FPS 0.15 ms/f, last video:   inf FPS 0.14 ms/f
  5.05s,  276 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 6530.33 FPS 0.15 ms/f, last video:   inf FPS 0.15 ms/f
  6.05s,  331 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 6572.34 FPS 0.15 ms/f, last video:   inf FPS 0.15 ms/f
  7.06s,  386 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 6606.00 FPS 0.15 ms/f, last video:   inf FPS 0.15 ms/f
  8.06s,  441 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 6627.62 FPS 0.15 ms/f, last video:   inf FPS 0.14 ms/f
  9.07s,  496 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 6643.38 FPS 0.15 ms/f, last video:   inf FPS 0.15 ms/f
 10.07s,  551 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 6660.48 FPS 0.15 ms/f, last video:   inf FPS 0.15 ms/f
 11.08s,  606 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 6659.45 FPS 0.15 ms/f, last video:   inf FPS 0.15 ms/f
 12.08s,  661 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 6671.08 FPS 0.15 ms/f, last video:   inf FPS 0.15 ms/f
 13.09s,  716 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 6669.14 FPS 0.15 ms/f, last video:   inf FPS 0.14 ms/f
 14.09s,  771 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 6681.80 FPS 0.15 ms/f, last video:   inf FPS 0.15 ms/f
 15.10s,  826 F, avrg game: 54.71 FPS 18.28 ms/f, avrg video: 6692.23 FPS 0.15 ms/f, last video:   inf FPS 0.15 ms/f
Average speed: 100.00% (16 seconds)

Am I doing something wrong?
Re: bgfx vulkan backend not really faster than opengl
belegdol #116306 10/31/19 08:18 PM
Joined: Mar 2001
Posts: 16,650
Likes: 1
USA
R
R. Belmont Offline
Very Senior Member
Offline
R. Belmont
Very Senior Member
R
Joined: Mar 2001
Posts: 16,650
Likes: 1
USA
No, you're using a completely different setup than I am. Probably not a 4K monitor, definitely not the same driver running the same softlist, probably not the same Nvidia driver, definitely not the same kernel, etc, etc.
Re: bgfx vulkan backend not really faster than opengl
R. Belmont #116307 10/31/19 08:29 PM
Joined: Mar 2004
Posts: 657
Germany
belegdol Offline OP
Senior Member
OP Offline
belegdol
Senior Member
Joined: Mar 2004
Posts: 657
Germany
Fair enough, in fullscreen mode (1920x1200) vulkan is already almost twice as fast. So it would make sense the difference becomes more dramatic at 4K. Thanks for clarifying!

Moderated by  R. Belmont 

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