Re: [auto-iwg] WP2 Telco Results

[Oscar Slotosch <slotosch@xxxxxxxxxx>]

Hello Maximilan Kögel,
Thank you for sending us these interesting results.

I think one direction of investigations should be to check the possibility to modularize the models.

For example within the WP 2.3 of AUTOSAR (Acceptance Tests), we have very promising results in splitting up 
AUTOSAR-models into different files to improve the portability of AUTOSAR configurations, exploring the 
"atpSplittable" mechanism that allows this and is currently also supported in ARTOP / ARText (for small models). 

So may be we should discuss on the modularization of models (in AUTOSAR, in ARTOP or in the general EMF) at 
our next meeting.

Kind regards,
	Oscar Slotosch
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> -----Ursprüngliche Nachricht-----
> Von: auto-iwg-bounces@xxxxxxxxxxx [mailto:auto-iwg-bounces@xxxxxxxxxxx]
> Im Auftrag von Maximilian Koegel
> Gesendet: Mittwoch, 25. Juli 2012 09:38
> An: auto-iwg@xxxxxxxxxxx
> Betreff: [auto-iwg] WP2 Telco Results
> 
> Dear all,
> 
> this email is to inform you about the outcome of the telco in WP2 on
> experiences with CDO. Christian Schenk (Bosch) and Andreas Rytina
> (itemis) reported on their experience in using CDO that results from a project
> with a size of about 1-person-year. Eike Stepper (project lead of CDO) joined
> as a guest and commented the results and provided feedback on possible
> improvements.
> In summary the results indicate that the use of CDO in the specific use case
> resulted in an overhead in computation time of about factor 6.
> Interestingly this factor also occurs if the involved model fully fitted into
> memory and was already pre-fetched. This factor might be significantly lower
> for other use cases. Nevertheless there will always be a significant overhead
> in time when using CDO. Estimates in the discussion ranged around a factor
> 2-3, but only specific test cases could reveal exact numbers. Additionally the
> actual overhead greatly depends on a specific use case and on how much the
> client is optimized towards using CDO. For Bosch the final solution was to
> switch to a 64bit JVM, since the models currently in use at Bosch fit in the
> memory of a 4GB machine.
> In conclusion CDO (as well as other model repositories) will not be a "silver
> bullet" that solves all problems involved in the usage of big models in terms
> of memory consumption and computation time. It is a very hard problem  to
> be able to handle large models efficiently. To be able to find a solution in the
> AutoIWG context a first and mandatory step should be to discuss the
> requirements of the participants in terms of maximum model size.
> Additionally it was pointed out in the telco that there is a number of other
> benefits that could require the use of model repository apart from the
> aforementioned challenges. Collaborative work on models, improved
> support for transactions and improved versioning and change tracking/diffing
> have been discussed in the telco as potential benefits.
> We suggest to add a discussion about the requirements for WP2 in terms of
> maximum model size and about other potential requirements (e.g.
> collaborative work) on the agenda of the next face-to-face meeting of the
> IWG.
> 
> Best Regards,
> Maximilian Kögel
> 
> 
> --
> Dr. Maximilian Kögel
> 
> Software Engineer / Consultant / General Manager EclipseSource Munich
> 
> Email: mkoegel@xxxxxxxxxxxxxxxxx
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