[Scummvm-tracker] [ScummVM :: Bugs] #15530: BAGEL: Excessive CPU usage

[ScummVM :: Bugs]

#15530: BAGEL: Excessive CPU usage
-------------------------+----------------------------
Reporter:  eriktorbjorn  |       Owner:  dreammaster
    Type:  defect        |      Status:  new
Priority:  normal        |   Component:  Engine: BAGEL
 Version:                |  Resolution:
Keywords:                |        Game:  The Space Bar
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Description changed by eriktorbjorn:

Old description:

> ScummVM 2.9 pre-release, running in Linux.
>
> According to the "top" command, outside of the movie cutscenes the game
> is constantly using 95% or more of the CPU. Even in debug mode, that
> seems excessive.
>
> From what I understand, CBofApp::runApp() uses Graphics::FrameLimiter to
> maintain 60 fps, and it also appears to be making constant full-screen
> updates. Which seems excessive. (I'm running without V-Sync. With V-Sync,
> I don't think frame limiter actually does anything?)
>
> As an experiment, I turned down the fps to 20. Now "top" to reports about
> 50% CPU used. Though when bringing up a menu (Examine, Attack, Pull leg
> off, etc.) it goes back to 100% again so I guess that's in another event
> loop? In the scenes where you can turn around freely, I can see that it's
> now less smooth. In the conversation close-ups, I can't really tell the
> difference.
>
> But I'm guessing the frame rate isn't the actual problem, it's that it's
> actually doing screen updates on each frame?

New description:

 ScummVM 2.9 pre-release, running in Linux.

 According to the "top" command, outside of the movie cutscenes the game is
 constantly using 95% or more of the CPU. Even in debug mode, that seems
 excessive.

 From what I understand, CBofApp::runApp() uses Graphics::FrameLimiter to
 maintain 60 fps, and it also appears to be making constant full-screen
 updates. Which seems excessive. (I'm running without V-Sync. With V-Sync,
 I don't think frame limiter actually does anything?)

 As an experiment, I turned down the fps to 20. Now "top" to reports about
 50% CPU used. Though when bringing up a menu (Examine, Attack, Pull leg
 off, etc.) it goes back to 100% again so I guess that's in another event
 loop? In the scenes where you can turn around freely, I can see that it's
 now less smooth. In the conversation close-ups, I can't really tell the
 difference.

 But I'm guessing the frame rate isn't the actual problem, it's that it's
 actually doing screen updates on each frame, whether it's needed or not?

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Ticket URL: <https://bugs.scummvm.org/ticket/15530#comment:1>
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