Original from  IVAN TODOROSKI  to ALL on 11-13-1998
Original Subject: PM drawing priorities...

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IT>   To test this, start some not very CPU consuming text mode program (I
IT>   use "ping localhost") in a window and start draging a biger window
IT>   with full-window draging enabled.
IT> 
IT>   If you run the ping process at any lower priority than Time Critical
IT>   (doesn't matter if it's Regular, Idle, or Foreground Server) you'll
IT>   notice it stops while you're draging the window, while if you run it
IT>   at Time Critical, you'll notice that it multitasks pretty smoothly.

 I suspec this is related to the video update, not the underlying app. 
 
IT>   So, this poses several questions:
IT> 
IT>    1) Why do PM operations run at a different priority than the calling
IT>       program?
IT> 
IT>    2) Where exactly is the code for these operations located?
IT>       PMSHELL.EXE, the PM*.DLL libraries, where?
IT> 
IT>    3) Is it possible to adjust the priority of these operations so that
IT>       they run at 0x200? (this is the only way to prevent the background
IT>       programs from stoping when doing heavy PM screen I/O)
IT> 
IT>   Regarding the 3rd question, I tried changing the priorities of the
IT>   threads of the second instance of PMSHELL.EXE (Process Commander
IT>   wouldn't touch the first instance), but it didn't have any effect on
IT>   the drawing operations (or any other operation for that matter).
IT> 
IT>   As a final note, I tried this on a Win98 system at my friend's home,
IT>   and when you type DIR /S and move the window (or move other windows)
IT>   with full window draging, the listing of directories doesn't stop, and
IT>   behaves just as you would expect (slows down a little). It looks
IT>   rather nice when you move the window with directories scrolling by in
IT>   it.

 OS/2 doesn't artifically boost the video output at the expense of the
underlying application threads. Win95/98 (and NT Workstation) are 
specificly "tuned" so video updates (user visable) will preempt any
other operations. This makes it "look" faster to the typical user. 


   Denis       

 All opinions are my very own, IBM has no claim upon them
. 
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