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Re: How to make large array [message #24458 is a reply to message #24457]

Wed, 28 March 2001 10:03

renjie
Messages: 10
Registered: October 1999

Junior Member

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<pre></pre>
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 Below are my tests, though the heap memory can be increased till
the maximum of RAM+VM (my machine is 512MB+2GB), the
 maximum size for a single arrary can not be larger than 256MB, I really
need to make array around 1GB, if anyboy can config out
 what is wrong with my system. Thanks.
<blockquote TYPE=CITE>
<pre>IDL> b=bytarr(1024,1024,255)
IDL> help, /mem
heap memory used:  267652748, max:  535039712, gets:      395, frees:      148
IDL> b=bytarr(1024,1024,256)
% Unable to allocate memory: to make array.
% Execution halted at:  $MAIN$     & ;nbsp;     & ;nbsp;     
IDL> help, /mem
heap memory used:  267652748, max:  267652776, gets:      398, frees:      151
IDL> c=bytarr(1024,1024,255)
IDL> help, /mem
heap memory used:  535039699, max:  535039727, gets:      402, frees:      154
IDL> d=bytarr(1024,1024,255)
% Unable to allocate memory: to make array.
% Execution halted at:  $MAIN$     & ;nbsp;     & ;nbsp;     
IDL> help, /mem
heap memory used:  535039699, max:  535039727, gets:      405, frees:      157
IDL> d=bytarr(1024,1024,125)
IDL> help, /mem
heap memory used:  666111805, max:  666111833, gets:      409, frees:      160</pre>
</blockquote>

Alex Schuster wrote:
<blockquote TYPE=CITE>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:     & ;nbsp; 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</blockquote>
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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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