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Pass by value and performance [message #46719]

Tue, 13 December 2005 21:00

Kenneth P. Bowman
Messages: 585
Registered: May 2000

Senior Member

A cautionary note on argument passing ...

I have a large code that does a lot of interpolation in
multi-dimensional arrays. Being a clever IDL programmer (too clever by
half, as it turns out), I package these arrays into structures along
with various information about the arrays. When these arrays are then
passed, for example, into INTERPOLATE, as

result = INTERPOLATE(data.array, x, y, z)

the array is passed by value, which entails making a copy of the array.
When these arrays get large, this causes a big performance hit. So, I
am in the process of making my code less clever (and uglier) but much
faster.

Cheers, Ken Bowman

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[Message index]

		Pass by value and performance By: Kenneth P. Bowman on Tue, 13 December 2005 21:00
		Re: Pass by value and performance By: Dick Jackson on Mon, 19 December 2005 09:33
		Re: Pass by value and performance By: Rick Towler on Fri, 23 December 2005 10:04
		Re: Pass by value and performance By: David Fanning on Fri, 16 December 2005 11:23
		Re: Pass by value and performance By: Rick Towler on Fri, 16 December 2005 11:03
		Re: Pass by value and performance By: JD Smith on Fri, 16 December 2005 10:40
		Re: Pass by value and performance By: David Fanning on Fri, 16 December 2005 10:24
		Re: Pass by value and performance By: Rick Towler on Fri, 16 December 2005 09:29
		Re: Pass by value and performance By: Paolo Grigis on Fri, 16 December 2005 03:08
		Re: Pass by value and performance By: Antonio Santiago on Fri, 16 December 2005 02:24
		Re: Pass by value and performance By: JD Smith on Thu, 15 December 2005 13:04

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