sched_ule performance on single CPU

[Chuck Swiger]

On May 27, 2008, at 7:51 PM, Unga wrote:
> Appreciate if Chuck Swiger could enlighten us again on
> what priority X run on Mac OSX? realtime or normal?

The X11 server seems to run with mildly elevated priority (46, where  
realtime is > 60 or so); something like an xterm runs with normal/ 
default priority of 31:

USER       PID %CPU %MEM      VSZ    RSS   TT  STAT STARTED      TIME  
PRI COMMAND
root        69   0.0  0.2    79700   3904  ??  Ss   16May08   0:02.74   
63 /usr/sbin/coreaudiod
cswiger     89   0.0  0.1   350800   2308  ??  S    16May08   0:00.70   
63 /usr/sbin/UserEventAgent -l Aqua
root        37   0.0  0.0   599664    704  ??  Ss   16May08   0:00.01   
63 /sbin/dynamic_pager -F /private/var/vm/swapfile
windowserver57   0.4  3.2   477116  66272  ??  Ss   16May08  51:38.50   
63 /System/Library/Frameworks/ApplicationServices.framework/Frameworks/ 
CoreGraphics.framework/Resources/WindowServer -daemon
cswiger     31   0.0  1.0   454876  19936  ??  Ss   16May08   2:41.97   
63 /System/Library/CoreServices/loginwindow.app/Contents/MacOS/ 
loginwindow console
cswiger   2142   0.0  3.5   530720  73700  ??  S    Fri07PM  75:16.23   
62 /Applications/iTunes.app/Contents/MacOS/iTunes -psn_0_884952
[ ... ]
cswiger   6449   0.0  0.4   437152   8456 s02  S+    9:16PM   0:06.87   
46 /usr/X11/bin/X/Applications/Utilities/X11.app/Contents/MacOS/X11 - 
auth /Users/cswiger/.Xauthority -launchd :1
cswiger   6461   0.0  0.3    83768   6060 s03  S     9:17PM   0:00.10   
31 xterm
cswiger   6467   0.0  0.1   356520   2512  ??  S     9:17PM   0:00.05   
31 quartz-wm

[ ...the above may wrap poorly, curse you format=flowed MIME type... ]

Note that realtime tasks like iTunes uses up a lot of CPU time  
compared with normal processes; it's even using more CPU time than the  
WindowServer has.  (This is from a MBP with a 2.33 GHz Core2Duo,  
running 10.5.2...)

-- 
-Chuck