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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