2012/2/29 Gilles Chanteperdrix <[email protected]> > On 02/29/2012 06:29 PM, Charles Lesire-Cabaniols wrote: > > Hi guys, > > > > I have installed a Debian+Xenomai (2.6.0) OS on my Gumstix Overo. > > > > I want to evaluate the execution time of a simple program, executed as a > > real-time thread. > > > > I definitely wonder about which functions to use, as I have completely > > inconsistent measures. > > I have tried using rt_timer_read, rt_timer_tsc, clock_gettime. > > I also directly read the CNNT register with ARM instructions (which is > the > > only one I think correct) in order to have a (good?) reference. > > (...) > > What am I doing wrong? > > So, you should printf("%Lu %Lu\n", rt_timer_read(), rt_timer_tsc()); > > Not printf("%lu", ...) > > -- > Gilles. >
Effectively, that looks cleaner, thanks: ----- Xenomai rt_timer_read ----- start: 49166276042 ; end: 49166432273 ; (s-e): 156231 ; CET: 156231 ----- Xenomai rt_timer_tsc ----- start: 639161547 ; end: 639163539 ; (s-e): 1992 ; CET: 1992 ----- Xenomai clock_gettime ----- [ s] start: 946684855 ; end: 946684855 ; (s-e): 0 ; CET: 0 [ns] start: 275520245 ; end: 275677089 ; (s-e): 156844 ; CET: 156844 My ARM instruction reads 110554. Which Xenomai function should I use? Which one is supposed to be the more accurate? Does rt_timer_read return nsecs? What is the unit of rt_timer_tsc? Charles.
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