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From Sascha Zelzer <s.zel...@dkfz-heidelberg.de>
Subject Re: event admin headers
Date Mon, 12 Aug 2013 21:25:45 GMT

one more fact not mentioned so far:

Using the Felix Event Admin bundle with the Knopflerfish OSGi framework 
improves the Felix Event Admin test results about a factor of 2 and 
more, reaching similar performance in the async case as the Knopflerfish 
Event Admin bundle. This could be related to a more efficient service 
registry implementation in Knopflerfish itself (at least for the used 
test cases).

- Sascha

On 08/12/2013 10:25 PM, Sascha Zelzer wrote:
> Hi,
> On 08/12/2013 08:35 PM, Pepijn Noltes wrote:
>> Hi Sascha,
>> Very interesting indeed, thanks for mailing this.
>> On Mon, Aug 12, 2013 at 2:32 PM, Sascha Zelzer
>> <s.zelzer@dkfz-heidelberg.de> wrote:
>>> Hi,
>>> I thought this might be of interest to you guys:
>>> When I implemented the event admin spec in C++ for the CTK Plugin Framework,
>>> I also literally took the Felix Java implementation and translated it to C++
>>> (including the fancy stuff like sending asynchronous events in parallel and
>>> blacklisting handlers given a certain timeout). After the implementation, I
>>> did a performance test of the event admin (from Felix, Equinox,
>>> Knopflerfish, and CTK) and found out that Felix performed the worst. This
>>> might be due to the more complex implementation (related to blacklisting
>>> etc.) but I didn't review the other Java implementations enough.
>>> I attached screenshots of the diagrams showing some numbers (The
>>> Knopflerfish event admin was by far the best performing) . The used versions
>>> are:
>> I think you forgot the attachment, could you (re)send it?
> I looked at my "Sent" folder and the attachments are there... maybe the
> mailing list doesn't allow png attachments? I am trying to attach them
> again, but you can also look at them here:
> http://blog.cppmicroservices.org/images/event_admin_async_perf.png
> http://blog.cppmicroservices.org/images/event_admin_sync_perf.png
>>> Knopflerfish 3.4.0 with the packaged Event Admin bundle (version 3.0.7)
>>> Eclipse Equinox as provided in Eclipse 3.7 together with the Eclipse Event
>>> Admin bundle (version 1.2.100)
>>> Felix Framework (version 4.0.3) with the Felix Event Admin bundle (version
>>> 1.3.2).
>> Personally I would like to see a good performance for the event admin
>> for Celix, especially because of it's potential target environment
>> (real-time embedded). So taking that in account and trusting that
>> Sascha did a good benchmark ;), I think it would be wise for Erik to
>> first take a look at the knoperfish implementation.
> I guess I could dig up my OSGi test bundle if someone is interested in
> trying to reproduce the results.
> Best,
> Sascha

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