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Re: LIST performance [message #73445 is a reply to message #73444]

Sat, 06 November 2010 14:55

penteado
Messages: 866
Registered: February 2018

Senior Member
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On Nov 6, 7:07 pm, JD Smith <jdtsmith.nos...@yahoo.com> wrote:
> EXPAND-CONCATENATE accumulate: 0.19039917
> PTR accummulate: 0.40397215
> LIST accummulate: 1.5151551
>
> I'm not sure why this is. In principle, a lightweight, (C) pointer-
> based linked list should have very good performance internally. So,
> while very useful for aggregating and keeping track of disparate data
> types, LIST's are less helpful for working with large data sets.

Do you have the results as a function of number of elements? The
curves will have different shapes, and the expected behavior might
occur only on some ranges of values. For one thing, expand-
concantenate is not a smooth function, and it also depends on another
parameter (the size of the buffer).

There is one plot of that kind in Michael Galloy's post:

http://michaelgalloy.com/2010/07/22/idl-8-0-lists-and-hashes .html

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[Message index]

		Re: LIST performance By: penteado on Tue, 09 November 2010 07:10
		Re: LIST performance By: Mark Piper on Mon, 08 November 2010 18:18
		Re: LIST performance By: Paul Van Delst[1] on Mon, 08 November 2010 07:33
		Re: LIST performance By: Mark[1] on Sun, 07 November 2010 12:14
		Re: LIST performance By: penteado on Sat, 06 November 2010 18:31
		Re: LIST performance By: JDS on Sat, 06 November 2010 17:03
		Re: LIST performance By: penteado on Sat, 06 November 2010 14:55
		Re: LIST performance By: Jeremy Bailin on Sat, 13 November 2010 14:21
		Re: LIST performance By: Mark Piper on Mon, 15 November 2010 16:29

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