comp.lang.idl-pvwave archive: archive » Re: memory issues redux

Home » Public Forums » archive » Re: memory issues redux

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: memory issues redux [message #41574 is a reply to message #41573]

Tue, 16 November 2004 10:08

R.G.Stockwell
Messages: 163
Registered: October 2004

Senior Member

"Paolo Grigis" <pgrigis@astro.phys.ethz.ch> wrote in message
news:419a3d56$1@news1.ethz.ch...
> Actually, you can put a smaller number of, say, floats in
> an array than bytes
>
> IDL> a=fltarr(1024L*1024*511) ;this is ok
> IDL> a=fltarr(1024L*1024*512)
> % Array has too many elements.
> % Execution halted at: $MAIN$
>
> So it looks like IDL internally adresses the memory in byte sized
> units, indipendently from the type of data stored, and therefore
> you can get up to 2 gigaelements for a byte array, but just 512
> megaelements for a float array, 256 megaelements for a double
> array etc.
>
> Therefore the real limit for a single array is at 2GB, no matter
> the array type.
>
> Cheers,
> Paolo

I'm a bit surprised to see that with floats. I was suspecting that
complex variables were just 2 floats internally, not that everything was
bytes. huh!

cheers,
bob

Report message to a moderator

[Message index]

		Re: memory issues redux By: R.G.Stockwell on Tue, 16 November 2004 15:23
		Re: memory issues redux By: Karl Schultz on Tue, 16 November 2004 14:51
		Re: memory issues redux By: R.G.Stockwell on Tue, 16 November 2004 11:06
		Re: memory issues redux By: Karl Schultz on Tue, 16 November 2004 10:33
		Re: memory issues redux By: R.G.Stockwell on Tue, 16 November 2004 10:08
		Re: memory issues redux By: David Fanning on Tue, 16 November 2004 09:50
		Re: memory issues redux By: Paolo Grigis on Tue, 16 November 2004 09:49
		Re: memory issues redux By: R.G.Stockwell on Tue, 16 November 2004 09:08
		Re: memory issues redux By: Paolo Grigis on Tue, 16 November 2004 03:11
		Re: memory issues redux By: marc schellens[1] on Mon, 15 November 2004 23:36
		Re: memory issues redux By: marc schellens[1] on Mon, 15 November 2004 23:33
		Re: memory issues redux - yay linux By: R.G.Stockwell on Thu, 18 November 2004 15:31

Previous Topic:	Re: using idl over the web
Next Topic:	Spectral subsetting of HDF files

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Dec 05 19:15:59 PST 2025

Total time taken to generate the page: 0.01659 seconds