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Re: How to make large array [message #24464 is a reply to message #24458]

Wed, 28 March 2001 08:31

Alex Schuster
Messages: 124
Registered: February 1997

Senior Member

renjie wrote:

> I tried to make large array, however, in Windows,
> the largest I can made is 256MB, and in Unix is 1 GB,
> it's supposed that the limitation is 2GB, do you have any
> idea about the largest array in IDL?

We habe encountered a problem with IDL and NT, where IDL is only able to
allocate 800 MB of memory in one step, even if it can allocate more
memory afterwards. But 256 MB is much too low, presuming there is enough
physical+virtual memory.

In Unix, I can allocate more than 1 GB:

--> idl
IDL Version 5.2.1 (sunos sparc). (c) 1999, Research Systems, Inc.
Installation number: 80864-0.
Licensed for use by: MPI Forschung

IDL> b=bytarr(1024,1024,1200)
IDL> help, /mem
heap memory used: 1258497902, max: 1258497930, gets: 227,
frees: 89

The limit command tells you about the datasize you are allowed to
allocate, maybe this is set too low for you. And maybe there's a similar
setting for Windows?

Alex
--
Alex Schuster Wonko@weird.cologne.de PGP Key available
alex@pet.mpin-koeln.mpg.de

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[Message index]

		Re: How to make large array By: Martin Schultz on Thu, 29 March 2001 00:36
		Re: How to make large array By: Craig Markwardt on Wed, 28 March 2001 14:53
		Re: How to make large array By: renjie on Wed, 28 March 2001 13:21
		Re: How to make large array By: Mark Hadfield on Wed, 28 March 2001 13:00
		Re: How to make large array By: renjie on Wed, 28 March 2001 10:33
		Re: How to make large array By: renjie on Wed, 28 March 2001 10:09
		Re: How to make large array By: renjie on Wed, 28 March 2001 10:03
		Re: How to make large array By: Alex Schuster on Wed, 28 March 2001 08:31

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