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RE: Octave Memory Exhausted Error Anyone?

From: William Krekeler
Subject: RE: Octave Memory Exhausted Error Anyone?
Date: Fri, 5 Nov 2010 14:17:35 +0000

Follow up to my post Nov 3 2010 10:12:33 CDT. Since no one responded I’ll rephrase my question.


Does anyone know a reason why Octave 3.2.4 in Windows can not use more than 1.5 GB of physical memory?


Bill Krekeler


From: William Krekeler [mailto:address@hidden
Sent: Wednesday, November 03, 2010 10:13 AM
To: address@hidden
Subject: Octave Memory Exhausted Error


I am in the process of testing Octave compatibility of a code set developed in Matlab. The code successfully completes in Matlab (R2009a). Despite having more than enough system memory I am getting the following error in Octave:

“error: memory exhausted or requested size too large for range of Octave's index type -- trying to return to prompt.”

Any help determining the source of this error, or a work around, is greatly appreciated.


Relevant Machine Details:

Windows XP Pro x64

12 GB physical ram

Octave 3.2.4, pre-compiled install version


Script Details for Original Failure:

                I’ve isolated the code failure to one line, but the error is not specific to this line of code as simplifying the line of code also fails. The original line of code and the simplified test line are as follows:


      <start code>

ImageCube = uint16( floor( (ImageCube - minIC).*(single(2^16-1)/(maxIC-minIC)) ) );

% [ above generates error]

ImageCube = ImageCube minIC;

% [above generates error ]

      <end code>


                Variable and Memory Information is as follows:


                ImageCube = 648x480x648 single array using 806215680 bytes (~ 0.8 GB)

                minIC = 1x1 single array using 4 bytes

                maxIC= 1x1 single array using 4 bytes


                At failure Octave is using 828,728 kB (~0.8 GB) of memory, total memory used on system = 3.25 GB, total memory free is roughly 8.6 GB for 12 GB total physical memory.



                Following the memory error above and a restart of Octave the following command succeeds. The code below creates a variable whose size is ~1.4 GB using the 1024 definition, at 4 bytes per element of the 376999999 element array. Note 377999999 elements fails with the same error. The test code implies two things, first, my original variable does not violate a maximum number of supported elements in an array, second, that my original variable does not violate a maximum memory allowed per variable. Though the test could be saying that Octave is being limited to roughly 1.5 GB of memory, which if the code duplicates an array during the math operations would mean that my original 0.8GB ImageCube variable would become a 1.6GB memory requirement during subtraction of the full array. Failure to perform mathematical operations on the large array is confirmed by the failure of the subtraction operation in the following codeset.


      <start code>

Clear all; ImageCube = ones(376999999, 1, ‘single’ );

% [ above  succeeds ]

ImageCube = ImageCube – 0;

% [ above fails ]

      <end code>


Any ideas for what could be causing this error or a work around?



Bill Krekeler


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