On Fri, 28 May 2010 12:36:58 +0200, clipka <ano### [at] anonymousorg> wrote:
>
> I guess the Windows scheduler gives comparatively long time slices to  
> processes, and doesn't cut them short even if higher-priority processes  
> are ready.

That is not what they say:

http://msdn.microsoft.com/en-us/library/ms685100.aspx

"If a higher-priority thread becomes available to run, the system ceases  
to execute the lower-priority thread (without allowing it to finish using  
its time slice), and assigns a full time slice to the higher-priority  
thread."

A quick test on my own system shows that the GUI of other applications can  
get slightly sluggish during a render, but not if I disable the preview  
display. Perhaps POV-Ray spends a noticeable amount of time drawing the  
preview (GDI functions are notoriously slow) and Windows does not want to  
preempt that (either because some parts are non-reentrant or because  
drawing to the screen temporarily boosts priority; I do not know).



-- 
FE

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