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Re: [xsl] optimization for very large, flat documents


Subject: Re: [xsl] optimization for very large, flat documents
From: Kevin Rodgers <kevin.rodgers@xxxxxxx>
Date: Thu, 20 Jan 2005 11:09:15 -0700

Thanks to everyone who responded.  For now I plan to follow Pieter's
idea of chunking the data into manageable pieces (16-64 MB).  Then I'm
going to look into Michael's suggestions about STX (unfortunately, not
yet a W3C recommendation and thus not widely implemented) and XQuery.

For anyone interested in some numbers, I've split each of my 2 large
files (613 MB and 656 MB) into subfiles of 16 K independent entries
(which vary in size), yielding sets of 25 and 37 subfiles (of approx. 25
MB and 17 MB each, respectively).  I process them by running Saxon 8.2
from the command line (with an -Xmx value of 8 times the file size) on a
Sun UltraSPARC with 2 GB of real memory.  The set of 37 17 MB XML
subfiles are processed with a slightly simpler stylesheet, and take
about 1:15 (minutes:seconds) each; the set of 25 25 MB XML subfiles use
1 document() call per entry to/from a servlet on a different host and
take about 8 minutes each.

My next step is to use Saxon's profiling features to find out where I
can improve my stylesheet's performance.

Thanks again to everyone on xsl-list for all your help!
-- 
Kevin Rodgers


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