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Re: Why is Intel XSLT accelerator so slow ?

From: "Joseph J. Kesselman" <keshlam-nospam@-------.--->
To: NULL
Date: 5/2/2008 10:25:00 AM

>> For little XML files (under 4MB), Intel XSLT accelerator performances
>> were better than Xalan performances, but for bigger files, XSLT
>> accelerator starts to be _very_ slow (exponential growth of the
>> processing time).

Very different codebases. Probably different tradeoffs taken at all 
levels from data structures to algorithms. I'm not surprised that the 
performance curves cross each other.

Reminder; XSLT, in general, requires that the whole input document be 
loaded into an in-memory data model since the stylesheet has full random 
access to it. Efficiency of that model becomes a serious issue on large 
docs, since swapping can be a performance-killer.

See much discussion on Xylem's mailing list archives of what we've done 
over the years (including some "cheats" for some specific usecases), and 
what we've considered as possible future directions if cycles ever 
become available to invest in that work.


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