Experimental Physics and
Industrial Control System

NetBSD seems to do what it says, which is either good, or bad, depending
on how you're bent.

$ ./testTimer
epicsThreadSleepQuantum=0.010000
Elapsed time to sleep for 0.000100 seconds 1000 times=19.995795
Elapsed time to sleep for 0.000200 seconds 1000 times=20.020289
Elapsed time to sleep for 0.000500 seconds 1000 times=20.000253
Elapsed time to sleep for 0.001000 seconds 1000 times=20.000248
Elapsed time to sleep for 0.002000 seconds 1000 times=20.000243
Elapsed time to sleep for 0.005000 seconds 1000 times=20.000370
Elapsed time to sleep for 0.010000 seconds 1000 times=20.000432
Elapsed time to sleep for 0.020000 seconds 1000 times=30.090901
$

Well, at least if it says you can't get below 0.01, it won't let you go
below 0.01, but would be nice if you could get more accuracy, I guess.

David Dudley


>>> Eric Norum <[email protected]> 9/29/2008 3:26 PM >>>
Looks like Darwin has the same issues.  Intervals down to 100  
microseconds seem to be useable.

norume@gnarly 283> ./testTimer
epicsThreadSleepQuantum=0.010000
Elapsed time to sleep for 0.000100 seconds 1000 times=0.122238
Elapsed time to sleep for 0.000200 seconds 1000 times=0.220128
Elapsed time to sleep for 0.000500 seconds 1000 times=0.520916
Elapsed time to sleep for 0.001000 seconds 1000 times=1.021224
Elapsed time to sleep for 0.002000 seconds 1000 times=2.021927
Elapsed time to sleep for 0.005000 seconds 1000 times=5.024166
Elapsed time to sleep for 0.010000 seconds 1000 times=10.026175
Elapsed time to sleep for 0.020000 seconds 1000 times=20.026937



-- 
Eric Norum <[email protected]>
Advanced Photon Source
Argonne National Laboratory
(630) 252-4793

BEGIN:VCARD
VERSION:2.1
X-GWTYPE:USER
FN:David Dudley
TEL;WORK:826-1265
ORG:;MIS
TEL;PREF;FAX:880-3741
EMAIL;WORK;PREF;NGW:[email protected]
N:Dudley;David
TITLE:Functional Analyst
END:VCARD

References:

epicsThreadSleep() and epicsThreadSleepQuantum() Mark Rivers

Re: epicsThreadSleep() and epicsThreadSleepQuantum() Eric Norum

Navigate by Date:

Prev: Re: Record Initialization Dirk Zimoch

Next: Re: epicsThreadSleep() and epicsThreadSleepQuantum() J. Lewis Muir

Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  <2008>  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 

Navigate by Thread:

Prev: Re: epicsThreadSleep() and epicsThreadSleepQuantum() J. Lewis Muir

Next: RE: epicsThreadSleep() and epicsThreadSleepQuantum() Jeff Hill

Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  <2008>  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024