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yet another idl memory question [message #66699]

Thu, 04 June 2009 08:53

jw2519
Messages: 1
Registered: June 2009

Junior Member

How do I force that IDL set aside a chunk of contiguous memory to be
refilled by a variable of equal size at each iteration of a procedure?

More specifically, I have a code which consists of three procedures.
One of these serves as the wrapper, one uses the IDL OpenDAP utility
to download the relevant data, and the third processes the data into
the grid and format that I want. The code will iterate for as long as
the wrapper indicates that processed data files need to be created. I
am running this on a 64-bit linux machine (IDL 7.0).

Each iteration of the code performs four OpenDAP calls; each call
downloads a large (~750MB) structure. After several iterations, the
code exits with an insufficient memory to allocate array error (or
sometimes "error reading value array: read is for xxx bytes, but there
are only yyy in the buffer"; always this error occurs within an
OpenDAP call). Using help,/memory and several of the tricks and tools
posted elsewhere, I have been able to substantially reduce the max
memory usage, but this only nets me another one and a half iterations
or so. So my guess is that the problem is that there is no longer a
sufficiently large block of contiguous memory into which to download
the structure. Each of the four structures is of equal size at each
iteration. How can I set aside a block of contiguous memory so that
IDL will reuse the same chunk for each structure every time i call the
procedure? I've tried using a solitary common block (i.e. just within
the procedure in question), and I've attempted to use pointers. The
program runs in both cases, but still exits with the same error. Of
course, I am not at all certain that I used either of these
correctly...

Any suggestions are greatly appreciated.

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[Message index]

		yet another idl memory question By: jw2519 on Thu, 04 June 2009 08:53
		Re: yet another idl memory question By: pgrigis on Wed, 10 June 2009 15:01
		Re: yet another idl memory question By: David Fanning on Wed, 10 June 2009 14:15
		Re: yet another idl memory question By: JDS on Mon, 15 June 2009 11:57
		Re: yet another idl memory question By: David Fanning on Mon, 08 June 2009 13:09
		Re: yet another idl memory question By: pgrigis on Mon, 08 June 2009 12:57
		Re: yet another idl memory question By: ben.bighair on Mon, 15 June 2009 12:07
		Re: yet another idl memory question By: pgrigis on Mon, 08 June 2009 12:56
		Re: yet another idl memory question By: David Fanning on Mon, 08 June 2009 12:05

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