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Why does everything in MAME now run at 50% speed? #122888 11/16/23 04:40 PM
Joined: Jul 2011 Posts: 166 Likes: 2 T TSCHAK OP Senior Member
OP TSCHAK Senior Member T Joined: Jul 2011 Posts: 166 Likes: 2	With recent builds of MAME (roughly over the last 6 months), now all of a sudden my emulation performance caps at 50% ```    ~/Workspace/mame    master ?1  ./mame -window mindset  ✔ Average speed: 50.15% (19 seconds)    ~/Workspace/mame    master ?1  ./mame -window puckman  ✔  41s  Average speed: 50.02% (2 seconds)    ~/Workspace/mame    master ?1  ``` What gives? Is there a compile time option I now need to set? -Thom

Re: Why does everything in MAME now run at 50% speed? TSCHAK #122889 11/16/23 05:30 PM
Joined: May 2004 Posts: 981 Likes: 59 Germany D Duke Senior Member
Duke Senior Member D Joined: May 2004 Posts: 981 Likes: 59 Germany	Is your display running at 30 Hz and you have VSync active?

Re: Why does everything in MAME now run at 50% speed? TSCHAK #122890 11/16/23 05:53 PM
Joined: Mar 2001 Posts: 17,098 Likes: 153 USA R R. Belmont Very Senior Member
R. Belmont Very Senior Member R Joined: Mar 2001 Posts: 17,098 Likes: 153 USA	Yeah, I would assume a 30 Hz display (e.g. 4K over HDMI < 2.1 instead of DisplayPort) plus VSync.

Re: Why does everything in MAME now run at 50% speed?

TSCHAK #122891 11/16/23 06:18 PM

Joined: Jul 2011

Posts: 166

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Both of my displays are vsync'ed yes, but they are both running at 60Hz.

Code

    ~  xrandr                                                                                                                                                                                                                         ✔ 

Screen 0: minimum 8 x 8, current 6000 x 3840, maximum 32767 x 32767
DP-3.2 connected 2160x3840+0+0 left (normal left inverted right x axis y axis) 600mm x 340mm
   3840x2160     60.00*+  30.00  
   2560x1440     59.95  
   1920x1080     60.00    59.94  
   1600x900      60.00  
   1280x1024     60.02  
   1280x800      59.81  
   1280x720      60.00    59.94  
   1152x864      59.96  
   1024x768      60.00  
   800x600       60.32  
   720x480       59.94  
   640x480       59.94    59.93  
DP-0 connected primary 3840x2160+2160+1437 (normal left inverted right x axis y axis) 600mm x 340mm
   3840x2160     60.00*+  30.00  
   2560x1440     59.95  
   1920x1080     60.00    59.94  
   1600x900      60.00  
   1280x1024     60.02  
   1280x800      59.81  
   1280x720      60.00    59.94  
   1152x864      59.96  
   1024x768      60.00  
   800x600       60.32  
   720x480       59.94  
   640x480       59.94    59.93

so is my system lying to me?

-Thom

Re: Why does everything in MAME now run at 50% speed? TSCHAK #122892 11/16/23 07:50 PM
Joined: Mar 2001 Posts: 17,098 Likes: 153 USA R R. Belmont Very Senior Member
R. Belmont Very Senior Member R Joined: Mar 2001 Posts: 17,098 Likes: 153 USA	The "30.00" is suspicious.

Re: Why does everything in MAME now run at 50% speed? TSCHAK #122893 11/16/23 09:36 PM
Joined: Jul 2011 Posts: 166 Likes: 2 T TSCHAK OP Senior Member
OP TSCHAK Senior Member T Joined: Jul 2011 Posts: 166 Likes: 2	What's even weirder, if i set -video soft, then 1 out of every 3 runs of mame run at 100%... wtaf? -Thom

Re: Why does everything in MAME now run at 50% speed? TSCHAK #122894 11/17/23 01:19 AM
Joined: Jan 2022 Posts: 12 Likes: 4 Mexicali, Spicy Canada F Foxhack Member
Foxhack Member F Joined: Jan 2022 Posts: 12 Likes: 4 Mexicali, Spicy Canada	... have you tried renaming the configuration file and running MAME to see what happens? I've had issues with the program once in a while where it stops working correctly after an update. Regenerating the config files usually fixes things for me.

Re: Why does everything in MAME now run at 50% speed? TSCHAK #122895 11/17/23 02:53 PM
Joined: Feb 2014 Posts: 1,016 Likes: 110 G Golden Child Very Senior Member
Golden Child Very Senior Member G Joined: Feb 2014 Posts: 1,016 Likes: 110	What happens if you drop both screens resolutions down to 1920x1080? also what if you do "-nowaitsync" ./mame -showusage \| grep vsync -waitvsync enable waiting for the start of VBLANK before flipping screens (reduces tearing effects)

Re: Why does everything in MAME now run at 50% speed? TSCHAK #122896 11/18/23 12:26 AM
Joined: Aug 2008 Posts: 24 Portugal R RomKnight Member
RomKnight Member R Joined: Aug 2008 Posts: 24 Portugal	As long shot you may want to look if the cables are the same and with somewhat decent quality to both monitors. No need to spend fortunes, that's not the point but cheap cables are cheap for a reason. I had issues before on three screens on the same brand cables (dirt cheap, but I learned the lesson). From flickering to different colors to simple monitors black screens as if the cables were disconnected, you name it. Last edited by RomKnight; 11/18/23 12:26 AM.

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