Ramon Costa i Castello wrote:
> Could you, please, indicate how did you measure it ?
> (is the code available ?)
I made 4 threads with different priority, that (almost) look like this
while(1)
pthread_np();
time = gethrtime()
rtf_put(time)
}
and logs the information in userspace.
for further information I have posted a message with the code.
>
> Which machine did you use ?
>
a PIII 666 mHz, No name pc.
I have olse tested it on a AMD-k6 500 mHz but the results was wery bad. So I shiftes
to a PIII 666.
I do undestand the problem from thread 1 to 2 but not 3 and 4. 3 and 4 should have
lower priority and I think it ts a bit wired.
>
> Thank You in advance,
>
> R. Costa-Castello
>
> Anders Gnistrup wrote:
>
> > Hi all.
> >
> > I have messured the latency in a multithreaded program. I have 4 threads and the
> > latency look like this.
> >
> > thread 1 : priority 0 -> latency 11-25 uSec.
> > thread 2 : priority 1 -> latency 11 - 50uSec.
> > thread 3 : priority 2 -> latency 11 - 19uSec.
> > thread 4 : priority 3 -> latency 11 - 15uSec.
> >
> > just looking at the fact one would assume that thread 4 have the higest
> > priority. But in linux 0 is just 0 and positive numberes are 'nice' -> lower
> > priority. Is this different in RTLinux.
> >
> > Anders Gnistrup.
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