Experimental Physics and
Industrial Control System

"J. Lewis Muir" <[email protected]> · Mon, 29 Sep 2008 16:37:12 -0400

On 9/29/08 4:26 PM, Eric Norum wrote:
> 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

I get similar results to Eric on x86 Darwin (Mac OS X 10.5.5) with both
EPICS 3.14.8.2:

epicsThreadSleepQuantum=0.010000
Elapsed time to sleep for 0.000100 seconds 1000 times=0.157522
Elapsed time to sleep for 0.000200 seconds 1000 times=0.295633
Elapsed time to sleep for 0.000500 seconds 1000 times=0.627397
Elapsed time to sleep for 0.001000 seconds 1000 times=1.137103
Elapsed time to sleep for 0.002000 seconds 1000 times=2.137704
Elapsed time to sleep for 0.005000 seconds 1000 times=5.139864
Elapsed time to sleep for 0.010000 seconds 1000 times=10.143002
Elapsed time to sleep for 0.020000 seconds 1000 times=20.142160

and EPICS 3.14.9:

epicsThreadSleepQuantum=0.010000
Elapsed time to sleep for 0.000100 seconds 1000 times=0.159914
Elapsed time to sleep for 0.000200 seconds 1000 times=0.327441
Elapsed time to sleep for 0.000500 seconds 1000 times=0.620934
Elapsed time to sleep for 0.001000 seconds 1000 times=1.130992
Elapsed time to sleep for 0.002000 seconds 1000 times=2.119084
Elapsed time to sleep for 0.005000 seconds 1000 times=5.135174
Elapsed time to sleep for 0.010000 seconds 1000 times=10.133973
Elapsed time to sleep for 0.020000 seconds 1000 times=20.143957

-lewis

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System