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Re: about memory [message #25150 is a reply to message #25149]

Mon, 21 May 2001 14:33

Jaco van Gorkom
Messages: 97
Registered: November 2000

Member

Hong Gang wrote:
> The following is the error given by my program.
> % Unable to allocate memory: to make array.
> Cannot allocate memory
>
> I have some large arrays as Tb(632*664, 880). I do not know what is the
> matter with the program. Can anyone give me some idea?

Usually this means that IDL has run out of memory. An array of dimensions
419648 (632*664) by 880 would have 369290240 elements. If it is of type
FLOAT, then each element takes up 4 bytes, coming to a grand total of
almost 1.4 Gigabyte. Do you have that much memory?

It might be possible to increase the amount of virtual memory (= swap space
on disk) available, but swapping memory from disk invariably slows down
programs quite a lot. A much better approach would be to rewrite your program
so that it needs less memory, e.g. by processing the data in smaller blocks.

hope this helps,
Jaco

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[Message index]

		Re: about memory By: Craig Markwardt on Tue, 22 May 2001 09:21
		Re: about memory By: davidf on Tue, 22 May 2001 07:52
		Re: about memory By: Med Bennett on Tue, 22 May 2001 07:30
		Re: about memory By: Craig Markwardt on Mon, 21 May 2001 17:08
		Re: about memory By: Amar Nayegandhi on Mon, 21 May 2001 15:38
		Re: about memory By: thompson on Mon, 21 May 2001 15:01
		Re: about memory By: Jaco van Gorkom on Mon, 21 May 2001 14:33

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