[Xenomai-help] How to interpret /proc/xenomai/stat CPU time of threads with priority 0

[Xenomai-help] How to interpret /proc/xenomai/stat CPU time of threads with priority 0

[Thierry Bultel]

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Hi all,

I was wondering if the displayed CPU time was, for these particular 
threads,
the only time spent in primary mode, of the total amount of time spent 
on the CPU.

I am namely currently debugging an application which has such kind of 
thread,
with a period of 50ms, and that takes up to 23% of the CPU.
That is bad, but not a real issue if that time is spent only in 
secondary mode,
but I do not know how to figure it out.
The mode switches frequency is equal to the period of my thread, since 
it uses rt_task_wait_period

I am a little bit concerned, my fear is that secondary mode time would 
be counted in the ROOT task ...
BTW, I am using version 2.5.2 (I know, it's old ;-) ).

Any help would be appreciated.

Thanks
Thierry

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Re: [Xenomai-help] How to interpret /proc/xenomai/stat CPU time of threads with priority 0

[Philippe Gerum]

On Fri, 2011-04-29 at 11:35 +0200, Thierry Bultel wrote:
> Hi all,
> 
> I was wondering if the displayed CPU time was, for these particular
> threads, 
> the only time spent in primary mode, of the total amount of time spent
> on the CPU.
> 
> I am namely currently debugging an application which has such kind of
> thread,
> with a period of 50ms, and that takes up to 23% of the CPU.
> That is bad, but not a real issue if that time is spent only in
> secondary mode,
> but I do not know how to figure it out. 
> The mode switches frequency is equal to the period of my thread, since
> it uses rt_task_wait_period
> 
> I am a little bit concerned, my fear is that secondary mode time would
> be counted in the ROOT task ...
> BTW, I am using version 2.5.2 (I know, it's old ;-) ).

23% is the time spent by your thread in primary mode, secondary mode is
indeed charged to the root thread.
> 
> Any help would be appreciated.
> 
> Thanks
> Thierry
> _______________________________________________
> Xenomai-help mailing list
> Xenomai-help@domain.hid
> https://mail.gna.org/listinfo/xenomai-help

-- 
Philippe.