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[xsl] xslt performance issue position() function used in predicate very slow
Subject: [xsl] xslt performance issue position() function used in predicate very slow From: krzysztof@xxxxxxxxxxxx Date: Fri, 25 Aug 2006 13:20:16 +0200 |
Hi, I'm processing xml files that have 150kB size they are composed from xml blocks that contain 350 elements with int values here is example < obj name="obj1"> <v>1</v> <v>2</v> <v>3</v> .... <v>350</v> </obj> obj blocks are repeated many times in general my xslt selects some set of <v> rows and saves in csv format e.g. select 1,2,3,4,15,28,71,17,19 and save to csv in my xslt I'm using below expression to select v rows <xsl:value-of select="./v[position()=$p]"/> ( in for-each loop I assign value to $p variable) on P4 2.8 Ghz 512MB ram it takes 20 seconds! to parse 150KB file !!! if I comment out this line it takes 1 second so definitely it's issue with position() and selecting this v values. BTW abbreviated version doesn't wok i.e. select="./v[$p]" but select="./v[$p+0]" works is this some bug ??? Thanks for any tips how to improve performance Chris
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