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Re: LIST performance [message #73438 is a reply to message #73434]

Sun, 07 November 2010 12:14

Mark[1]
Messages: 66
Registered: February 2008

Member

A while back I wrote an MGH_Vector class that performs much the same
function as IDL 8's LIST (random-access container for heterogeneous
data). For the simple problem of accumulating a bunch of n floats then
saving the results to an array, the MGH_Vector is slower than simple
array concatenation for small n and faster for large n, as you'd
expect, the crossover occurring at around n = 25,000. In some quick
and dirty tests I just ran, MGH_Vector outperformed LIST by a factor
of 2.4 from n = 10^4 to 10^6, then at n = 10^7 MGH_Vector stayed
linear, but LIST started working the paging file and then ran out of
memory. (To be fair to the LIST class, the amount of memory that IDL 8
has available in GUI mode on win32 is pitifully small at 512 MiB. I
could switch to the console mode, but I'm afraid I can't be bothered.)

You'd think the ITT programmers could do a better job of programming
an extensible list class than little old me.

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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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