[LITMUS^RT] CPU usage of real-time tasks

[Jonathan Herman]

Hi Youcef,

The best way to do this would be to use the sched_trace infrastructure. The
process of capturing this data while a task is running is described here:
https://wiki.litmus-rt.org/litmus/Tracing

You would have you write your own code to parse this data and output task
utilization. The unit-trace repository contains python code which you can
use as a guide:
http://cs.unc.edu/~mollison/unit-trace/

The file which parses the sched_trace data is
unit-trace/unit_trace/trace_reader.py. Sorry for not noticing your email
sooner.

On Sun, Mar 24, 2013 at 11:55 AM, Youcef Amine Benabbas <
s9yobena at stud.uni-saarland.de> wrote:

> Hi everyone,
>
> Is there a way to precisely know the cpu usage of a real-time task. For
> instance, rtspin (from liblitmus) receives as arguments a wcet and
> period; however the utilization of an rtspin task measured by the "time"
> command is different from wcet/period.
>
> Since the time command will not run in the presence of real-time tasks,
> I would like to know if there exists an alternative to precisely know
> the cpu utilization of a real-time task (this may be needed if the
> performance of a real-time scheduling algorithm  has to be conducted
> based on the total utilization of a given task-set).
>
> Kind regards,
> Youcef
>
>
> _______________________________________________
> litmus-dev mailing list
> litmus-dev at lists.litmus-rt.org
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>



-- 
Jonathan Herman
Department of Computer Science at UNC Chapel Hill
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