Subject: Re: [xsl] Max size? From: Joseph Kesselman <keshlam@xxxxxxxxxx> Date: Wed, 8 Jan 2003 13:02:54 -0500 |
>If I were to generate very large XML files (upwards of 1 Meg?), >would I encounter problems when processing with >XSLT, considering that I would want to sort on various elements. Since XSLT permits random access to the document's content, most XSLT processors require that the entire source document be in memory at once. Depending on your machine's available space for stack and swapper, this may or may not impose limitations on the maximum size document you can handle, and depending on the XSLT processor architecture there may be other limitations. Obviously, sorting involves additional tables, which also consume storage. Early versions of Xalan had some hardcoded limits on maximum document size; those limits should no longer exist in current releases. Xalan can also be set into an "incremental" mode in which the source document is lazily loaded; that imposes some overhead, but if your stylesheet doesn't read all the way to the end fo the document, this may yield a perfomance gain. (There has been some discussion of recognizing stylesheets which don't require holding everything in memory at once and handling them differently than the general case. I haven't heard any reports of this sort of optimization being successfully implemented. Xalan has brainstormed several possible solutions but we haven't had time to experiment with them; that's one of the things we're hoping to investigate this year.) ______________________________________ Joe Kesselman / IBM Research XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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