Re: [taste-users] PolyORB-Hi message queue - Sporadic PI Buffer and Attributes

[Maxime.Perrotin@xxxxxxx]

Hi Javier,

The Queue_Size
> 1 is currently not well specified (or does not work). I raised a ticket
a few days ago to address this:
 https://taste.tuxfamily.org/mantis/view.php?id=741
 (Jerome can probably give a hint on that). At the moment the policy
in case of overflow (message loss) is to display a message at runtime (valid
on Linux platforms). There is no way to specify a different behaviour ("Take
the latest value", "Drop message"..). In general, error
handling at system level is missing.

Inter-arrival
time (MIAT) ensures that sporadic interfaces are not executed more frequently
than the value you set. This is enforced at runtime.

Deadline and WCET
are not used at runtime. They are used (at least WCET) by the scheduling
analysis tools (Cheddar/Marzhin) to check the system feasibility.

Kind regards
Maxime



ESA
- European Space Agency

Maxime Perrotin
Proba-3 Plaftorm & Payload Software Engineer
TASTE
Lead Engineer
System, Software and Technology Department

ESTEC
Keplerlaan 1, PO Box 299
NL-2200 AG Noordwijk, The Netherlands
maxime.perrotin@xxxxxxx
| www.esa.int
T +31 71 565 4923 | F +31 71 565 5420 





From:
       Javier
Hidalgo Carrió <javier.hidalgo_carrio@xxxxxxx>
To:
       taste-users@xxxxxxxxxxxxxxxxxxx
Date:
       25/01/2018
16:01
Subject:
       [taste-users]
PolyORB-Hi message queue - Sporadic PI Buffer and Attributes

---

Dear Tasters,
I would like to know whether the PI queue
when size > 1, Is it a circular buffer?

In addition: what is the influence of the attributes in the behavior. I
read in the taste documentation that:

* Inter-arrival time, is the minimum expected execution time in ms
* Deadline,  is the maximum expected execution time in ms
* WCET. I don't find information about this.

How this affect the execution? In case the buffer for the queue is full.
Is there a manner to know when new data arrive to the PI and is dropped
because of queue full?

Regards,

-- 
Javier Hidalgo-Carrió
Researcher
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