This is more of a general Linux issue I guess.
I run povray at nice -19. It doesn't behave as expected. That is, it 
doesn't really yield to other processes.
When I run povray at low priority on Windows, he basically stops for 
anything else. Like here, povray should be stopped, and ffmpeg given 
800% of CPU.

   PID USER      PR  NI    VIRT   SHR S  %CPU %MEM     TIME+ COMMAND 

  8976 dick      39  19 1301940  4512 S 539.4  2.6  32:43.18 povray
11804 dick      20   0 3873964 31452 S 194.4  1.1   5:25.79 ffmpeg

This can't be just the way things are?

--
dik

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