* FW: [Xenomai-help] Xenomai thread runtime statistics
@ 2006-03-17 15:17 Moser, Dan
2006-03-17 15:57 ` Philippe Gerum
0 siblings, 1 reply; 6+ messages in thread
From: Moser, Dan @ 2006-03-17 15:17 UTC (permalink / raw)
To: xenomai
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?
Hope to hear from someone.
Thanks,
Dan
> -----Original Message-----
> From: xenomai-help-bounces@domain.hid
> [mailto:xenomai-help-bounces@domain.hid] On Behalf Of Moser, Dan
> Sent: Wednesday, March 15, 2006 4:06 PM
> To: xenomai@xenomai.org
> Subject: [Xenomai-help] Xenomai thread runtime statistics
>
> Hi,
>
> I am seeking whatever information is available regarding
> Xenomai task runtime statistics. Things such as thread
> real-time usage, CPU usage, etc. and how to access that
> information from within an application.
>
> In particular, I would like to find out things such as how long (in
> real-time) each iteration of a given periodic task takes to
> run. I ultimately want to use this info to figure out how
> much "head room" I have left in a given rate group of a
> multi-rate/multi-tasking control system.
>
> Thanks in advance,
> Dan
>
> _______________________________________________
> Xenomai-help mailing list
> Xenomai-help@domain.hid
> https://mail.gna.org/listinfo/xenomai-help
>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: FW: [Xenomai-help] Xenomai thread runtime statistics
2006-03-17 15:17 FW: [Xenomai-help] Xenomai thread runtime statistics Moser, Dan
@ 2006-03-17 15:57 ` Philippe Gerum
2006-03-17 16:11 ` Jan Kiszka
0 siblings, 1 reply; 6+ messages in thread
From: Philippe Gerum @ 2006-03-17 15:57 UTC (permalink / raw)
To: Moser, Dan; +Cc: xenomai
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.
With the Xenomai-enabled POSIX API, you can use clock_gettime(CLOCK_MONOTONIC) to
get a precise timestamp derived from the onboard TSC. With the native API,
rt_timer_tsc() returns the same information.
e.g.
for (;;) {
struct timespec ts_start, ts_end;
clock_gettime(CLOCK_MONOTONIC,&ts_start);
<work>
clock_gettime(CLOCK_MONOTONIC,&ts_end);
/* work cycle consumption: ts_end - ts_start */
}
> Hope to hear from someone.
>
>
> Thanks,
> Dan
>
>
>
>
>>-----Original Message-----
>>From: xenomai-help-bounces@domain.hid
>>[mailto:xenomai-help-bounces@domain.hid] On Behalf Of Moser, Dan
>>Sent: Wednesday, March 15, 2006 4:06 PM
>>To: xenomai@xenomai.org
>>Subject: [Xenomai-help] Xenomai thread runtime statistics
>>
>>Hi,
>>
>>I am seeking whatever information is available regarding
>>Xenomai task runtime statistics. Things such as thread
>>real-time usage, CPU usage, etc. and how to access that
>>information from within an application.
>>
>>In particular, I would like to find out things such as how long (in
>>real-time) each iteration of a given periodic task takes to
>>run. I ultimately want to use this info to figure out how
>>much "head room" I have left in a given rate group of a
>>multi-rate/multi-tasking control system.
>>
>>Thanks in advance,
>>Dan
>>
>>_______________________________________________
>>Xenomai-help mailing list
>>Xenomai-help@domain.hid
>>https://mail.gna.org/listinfo/xenomai-help
>>
>
>
> _______________________________________________
> Xenomai-help mailing list
> Xenomai-help@domain.hid
> https://mail.gna.org/listinfo/xenomai-help
>
--
Philippe.
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: FW: [Xenomai-help] Xenomai thread runtime statistics
2006-03-17 15:57 ` Philippe Gerum
@ 2006-03-17 16:11 ` Jan Kiszka
2006-03-17 16:13 ` Philippe Gerum
0 siblings, 1 reply; 6+ messages in thread
From: Jan Kiszka @ 2006-03-17 16:11 UTC (permalink / raw)
To: Philippe Gerum; +Cc: xenomai, Moser, Dan
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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.
Jan
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: FW: [Xenomai-help] Xenomai thread runtime statistics
2006-03-17 16:11 ` Jan Kiszka
@ 2006-03-17 16:13 ` Philippe Gerum
2006-03-17 16:22 ` Jan Kiszka
0 siblings, 1 reply; 6+ messages in thread
From: Philippe Gerum @ 2006-03-17 16:13 UTC (permalink / raw)
To: Jan Kiszka; +Cc: xenomai, Moser, Dan
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.
> Jan
>
--
Philippe.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: FW: [Xenomai-help] Xenomai thread runtime statistics
2006-03-17 16:13 ` Philippe Gerum
@ 2006-03-17 16:22 ` Jan Kiszka
2006-03-17 16:26 ` Philippe Gerum
0 siblings, 1 reply; 6+ messages in thread
From: Jan Kiszka @ 2006-03-17 16:22 UTC (permalink / raw)
To: Philippe Gerum; +Cc: xenomai, Moser, Dan
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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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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: FW: [Xenomai-help] Xenomai thread runtime statistics
2006-03-17 16:22 ` Jan Kiszka
@ 2006-03-17 16:26 ` Philippe Gerum
0 siblings, 0 replies; 6+ messages in thread
From: Philippe Gerum @ 2006-03-17 16:26 UTC (permalink / raw)
To: Jan Kiszka; +Cc: xenomai, Moser, Dan
Jan Kiszka wrote:
> 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?
Yes, like in Dan's case, I guess.
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).
>
Also true.
> Jan
>
--
Philippe.
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2006-03-17 16:26 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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2006-03-17 15:17 FW: [Xenomai-help] Xenomai thread runtime statistics Moser, Dan
2006-03-17 15:57 ` Philippe Gerum
2006-03-17 16:11 ` Jan Kiszka
2006-03-17 16:13 ` Philippe Gerum
2006-03-17 16:22 ` Jan Kiszka
2006-03-17 16:26 ` Philippe Gerum
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