Subject: Re: [xsl] Recursion performance (fibonacci numbers) From: Mukul Gandhi <gandhi.mukul@xxxxxxxxx> Date: Tue, 17 Jan 2006 09:16:42 +0530 |
Thanks Mike. I was using the wrong namespace. With saxon:memo-function="yes" its quite fast. Regards, Mukul On 1/17/06, Michael Kay <mike@xxxxxxxxxxxx> wrote: > saxon:memo-function="yes" works for me. I get > > n time > 1000 90msecs > 2000 610msecs > > It's not linear at large values of "n" because BigInteger arithmetic takes > longer the larger "n" becomes; but the use of a memo function certainly > solves the XSLT-level problem. > > Are you sure you used the right namespace http://saxon.sf.net/ ? > > Michael Kay > http://www.saxonica.com/ > > > -----Original Message----- > > From: Mukul Gandhi [mailto:gandhi.mukul@xxxxxxxxx] > > Sent: 16 January 2006 15:08 > > To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx > > Subject: [xsl] Recursion performance (fibonacci numbers) > > > > Dear All, > > I am running this XSLT stylesheet with Saxon b 8.6.1. This prints > > 1st n Fibonacci numbers, where n is supplied as a stylesheet > > parameter. > > > > <?xml version="1.0" encoding="UTF-8"?> > > <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" > > xmlns:xs="http://www.w3.org/2001/XMLSchema" > > xmlns:myfunc="http://dummy" > > version="2.0"> > > > > <xsl:output method="text" /> > > > > <xsl:param name="n" /> > > > > <xsl:template match="/"> > > <xsl:for-each select="1 to $n"> > > <xsl:value-of select="myfunc:fibonacci(position())" > > /><xsl:text> </xsl:text> > > </xsl:for-each> > > </xsl:template> > > > > <xsl:function name="myfunc:fibonacci" as="xs:integer"> > > <xsl:param name="n" as="xs:integer" /> > > > > <xsl:sequence select="if (($n = 1) or ($n = 2)) > > then > > 1 > > else > > (myfunc:fibonacci($n - 1) + > > myfunc:fibonacci($n - 2))" > > /> > > > > </xsl:function> > > > > </xsl:stylesheet> > > > > The problem is, that it takes long time for large values of n. I > > observed the following timing > > > > n=32 -> 35.5 secs > > n=33 -> 55.2 secs > > n=34 -> 1 min 27.3 secs > > n=35 -> 2 mins 20.1 secs > > > > Is it possible I can improve the performance of this stylesheet for > > large values of n? > > > > Regards, > > Mukul
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