Argonne National Laboratory

Experimental Physics and
Industrial Control System

<20022003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  Index <20022003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020 
<== Date ==> <== Thread ==>

Subject: Re: base max thread priority
From: Andrew Johnson <anj@aps.anl.gov>
To: Marty Kraimer <mrk@aps.anl.gov>
Cc: Eric Norum <eric.norum@sasktel.net>, Till Straumann <strauman@SLAC.Stanford.EDU>, Jeff Hill <johill@lanl.gov>, core-talk@aps.anl.gov
Date: Mon, 02 Dec 2002 11:12:49 -0600
Marty Kraimer wrote:

Booting tornado II gives

tExcTask   _excTask   fe80f4   0 PEND      6cd04   fe8054      0     0
tLogTask   _logTask   fe57cc   0 PEND      6cd04   fe5728      0     0
tShell     _shell     ed9540   1 READY     2cfc4   ed91e8 1c0001     0
tTelnetd   _telnetd   edfb38   2 PEND      253ea   edfa48      0     0
tNetTask   _netTask   f57408  50 PEND      253ea   f573b0      0     0
tPortmapd  _portmapd  ede5f8 100 PEND      253ea   ede4b0     16     0

Thus to ensure really good real time performance the priority of all of the above should be changed.

Never change the priority of tExcTask, it is used by the OS to do things that can't be run in an ISR but have been requested by one (for example outputting the message in response to a Bus Error). I would also advise not changing the shell priority here at APS at least - it has got us out of many sticky situations in the past because it's higher than everything else.

I don't think we should consider changing any existing task priorities on vxWorks, although we could adjust the way that the OSI thread priorities map to vxWorks ones if we wanted to reduce jitter by putting the scan tasks higher than tNetTask. I'd want someone to do a thorough test first though, and we don't have time for that before R3.14.1. If anyone does want to reduce the priority of tShell it's very easy to do in a vxWorks startup script.

- Andrew
--
"Life is what happens while you're busy making other plans." - John Lennon


References:
Re: base max thread priority Eric Norum
Re: base max thread priority Marty Kraimer

Navigate by Date:
Prev: Re: base max thread priority Eric Norum
Next: RE: 3.14 Gateway Performance Kenneth Evans, Jr.
Index: <20022003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020 
Navigate by Thread:
Prev: Re: base max thread priority Eric Norum
Next: INET address Marty Kraimer
Index: <20022003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020 
ANJ, 02 Feb 2012 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·