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From Elias Torres <el...@torrez.us>
Subject Re: Atom Data Model and Testing
Date Wed, 05 Jul 2006 19:35:25 GMT

joe kim wrote:
> James,
> Thanks for taking the time to explain your stance on these things.  I
> like your experimentation approach.  I will play around with some
> things and get back to you on that in a week or so.
>> Rob Yates (who is on paternity leave right now so likely can't respond
>> right now) has performed some performance analysis of Abdera with Axiom
>> relative to Rome (which separates the model impl from the parsing).
>> Parsing just titles and links from Tim Bray's feed, Rome used 6+MB of
>> RAM and over 600 million CPU instructions; Abdera with Axiom used around
>> 700k of RAM and around 90 million CPU instructions.  The secret of the
>> performance improvement was in the use of Axiom and StAX -- that is, to
>> say, pull parsing and lazy creation of the object model.
> These performance metrics are most likely a result of JDOM vs.
> Axiom/StAX and not due to the model being separated from the parsing.
> Do you happen to know what tool Rob used to determine CPU
> instructions?  I would imagine it would vary due to the nature of JIT.
>> I had originally started down the path you are suggesting, this is
>> better.  Please, run some performance analysis of your own.  Look at the
>> stack traces.  Compare them with those of Rome.  I think you'll be
>> surprised at how much kruft is *not* there *because* of the direct
>> dependencies on Axiom and StAX.
> I think API cleanliness is orthogonal to performance. Here are my
> questions:
> 1) Is the API uglier or simpler because of dependencies on Axiom and StAX?
> 2) Is the API higher performance due to dependencies on Axiom and StAX?
> I am arguing that 1) is uglier.  Not going to argue 2. unless I run my
> own performance tests like you suggested.
> One last question, JSON support.  Have you and smackman made any
> progress on JSON serialization?
> http://smackman.com/2006/05/08/applicationatomjson/
> How would suggest atom+json serialization be implemented?
> Joe

Hi Joe,

I have a JSON serialization that will be checked in soon against the new
writer/reader changes James made especially for this and an RDF
parser/reader that we have as well.


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