Re: FW: [Xenomai-help] Xenomai thread runtime statistics

[Jan Kiszka <jan.kiszka@domain.hid>]

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Philippe Gerum wrote:
> Jan Kiszka wrote:
>> Philippe Gerum wrote:
>>
>>> Moser, Dan wrote:
>>>
>>>> Hi,
>>>>
>>>> I am still searching for ways (hopefully via some API(s)) to get
>>>> Xenomai
>>>> run-time thread execution info (my original post is below).
>>>>
>>>> Being a newbie, I apologize if the answer "should be obvious".  I am
>>>> still getting up to speed with both Linux and Xenomai.
>>>>
>>>> Is there a better list on which I should post this question?
>>>>
>>>
>>> This question is perfectly relevant to this list, the thing is that
>>> there's no simple, built-in way of getting execution stats for real-time
>>> threads yet. The best way to find out the execution time of your work
>>> cycle would be to measure it using the high precision clock information.
>>
>>
>> Hmm, wouldn't it be feasible to add such statistics to I-pipe level? I'm
>> thinking of something like time spent in domain X, Y, Z vs. the overall
>> runtime, preferably converted to percentage usage.
>>
> 
> This would be nice, but only part of the issue, since you might have
> several real-time context switches occurring in a single Xenomai domain
> activation.

You mean per-thread statistics? For sure, but a very common question is:
"How much remains for Linux?" And this feature could give a general hint
(although detailed benchmarking will typically be required as well, as
the effect of Xenomai+RT-load on application-specific Linux service may
have to be analysed more thoroughly).

Jan


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