MATLAB: How to increase the memory allocated to Matlab R2014a on 64-bit Windows 8

memory allocation

My machine had a 4 GB RAM and I recently installed an extra 8 GB,now having a total of 12 GB RAM. When I go to Computer-> Properties it also shows that I have an available 12 GB RAM. However, when running my program I get an OUT OF MEMORY error. After typing memory in the MATLAB prompt I got the following: Maximum possible array: 17588 MB (1.844e+10 bytes) * Memory available for all arrays: 17588 MB (1.844e+10 bytes) * Memory used by MATLAB: 1597 MB (1.675e+09 bytes) Physical Memory (RAM): 12163 MB (1.275e+10 bytes)

Limited by System Memory (physical + swap file) available.

So, it seems that the memory used by MATLAB is limited and does not take full advantage of the system’s memory.. Is some way to determine the memory allocated to MATLAB? I am using a 64-bit Windows 8. Many thanks!

Best Answer

The information show, that Matlab can allocate an array with 17GB. Beside the physical RAM, a swap file allows to allocate this amount of memory.

The impression is wrong, that the memory used by Matlab is limited.

Please post the command, which causes the Out-of-memory error. Perhaps there is simply a bug in it.

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MATLAB: How to increase memory and max array length!

Buy more RAM. By my calculation, a 2^16x2^16 matrix of doubles would require 32 GB of RAM. Chances are you'll be making at least 1 more matrix during you computations that is this size. And in some additional RAM for your system to use, and your are talking ~68 GB of RAM.

MATLAB: Out of memory error

You might just be out of memory. You appear to be using a 32 bit version of MATLAB, are so are being limited by the fact that MS Windows can give 32 bit processes at most 3.0 Gigabytes of memory, and even then can only give that much memory if a special boot-time flag was given.

If you were able to switch to a 64 bit version of memory on a 64 bit operating system on the same computer, then you would be able to configure your system to add swap space that your MATLAB program could use. This would, however, probably be rather slow.

Better would be to get a computer with more memory and 64 bit Windows and a 64 bit version of MATLAB.

It is possible that your system does have enough memory to store the matrix (but would probably fail to try to use the matrix.) The line

SR(tn,:,:)=SS;

being the problem hints to me that the software is not pre-allocating all of the memory to store the data. When you do not pre-allocate an output matrix, then each time you go to grow the output matrix, it needs to take a copy of the data, which temporarily duplicates the data in memory, possibly filing up memory. If the code had done something like

SR = zeros(83, 640, 480);    %but with appropriate sizes!

ahead of time then that problem would not occur.

Best Answer

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