> -----Message d'origine-----
> De : Simon Leonard [mailto:community-noreply@qnx.com]
> Envoyé : 12 octobre 2010 13:04
> À : ostech-core_os
> Objet : 1ms latency every 6.5 second with pulses/signals
> 
> First post here.
> 
> We need to use periodic threads and we get good latencies (1.5usec) except
> there is an ugly 1ms latency that shows up every 6.53 second, which is not
> acceptable for our application. I've tried to get rid of it by increasing the
> priority, disabling services, testing a different computer using signals/pulses
> and so on but it won't go away.
> 
> One thing that I noticed is that the first 1ms latency always appear at 6.53
> second relative to the execution of the program (and every 6.53 second
> after). Thus if this was caused by an interrupting service on the computer I'd
> think that the first 1ms latency would show up at different times.
> 
> I am posting the minimal code here hoping that someone can help. My
> compile command is:
> qcc -V4.2.4,gcc_ntox86 -o latency latency.c and you can pipe the output with:
> ./latency > output
> 

http://www.qnx.com/developers/docs/6.5.0/index.jsp?topic=/com.qnx.doc.neutrino_prog/timing.html

> Regards.
> 
> /sl
> 
> 
> 
> 
> 
> _______________________________________________
> 
> OSTech
> http://community.qnx.com/sf/go/post70315