[SDL] CPU-usage differences on winXP <-> Linux

[Ryan C. Gordon]

> strange things happen.. I have a 3 thread SDL / OGL application (main 
> thread launches 1 thread for visualization & event handling, 1 for data 
> reloading from hard disc). In the vis thread occurs heavy and cpu 
> intensive data shifting, but not associated with SDL functions. Under 
> Linux is everything fine and the program performance is acceptable, cpu 
> usage @90-100%. On winXP the CPU usage lies between 0-5% and the 
> performance is lousy.. Same code for both! Adjusting the nice values on 
> winXp has no influence. Any ideas...? :-)

It's probably syncing to vblank every frame on Windows, which means you 
won't get more than 60fps or so, and the CPU will be mostly idle.

This isn't actually a bad thing, unless your animation is counting on a 
high framerate to look good...separate the drawing from framerate and 
it'll be fine.

--ryan.