> > Hello!
> >
> > Is there any function for high precision time measuring.
> > time() returns only in second. I need nanoseconds.
> >
> you can directly read the TSC but that will not realy give you nanoseconds
> resolution as the actual read access even on a PIII/1GHz is going to take
> up to a few 100 nanoseconds, and depending on what you want to time
> stamp the overall jitter of that code can easaly be in the
> range of a microsecond.
>
> There are some hard-realtime patches to the Linux kernel that will
> allow time precission of aprox. 1us (the TSC has a precission of 32ns)
> but I don't think you can get below that without dedicated hardware.
>
> for RTLinux check at ftp://ftp.rtlinux.org/pub/rtlinux/
I recommend RTAI instead. It's more feature-rich, and works with newer
kernels.. the url is http://www.aero.polimi.it/~rtai/, or
http://www.rtai.org.
-Calin
>
> hofrat
> -
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