out of memory error

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oblivious 2013-8-31

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https://ww2.mathworks.cn/matlabcentral/answers/86073-out-of-memory-error

Hi,

I ran a large Monte-Carlo simulation using a loop on a script (not function). After several iterations I got a Out Of Memory error message. I saved the workspace, restarted MATLAB, loaded the saved workspace and modified the loop variable to complete remaining iterations and got the result.

How MATLAB handled this kind of scenario? Why didn't I get any error message when the simulated the remaining segments as I loaded same variables into the RAM?

I need to understand the process badly as I have several other similar simulations to run. Is there any simpler way to get rid of the problem?

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oblivious 2013-9-1

Thanks Mr. Roberson. After analyzing for whole day it appears to me that it is due to fragmented memory. Is there any possible solution to this problem apart from significantly changing my algorithm (i.e. without breaking my variables into smaller pieces)?

Walter Roberson 2013-9-1

Memory fragmentation can often be considerably reduced by pre-allocation. If you currently expand any matrix (or vector) within a loop, change that to pre-allocate if you can (and otherwise switch to algorithms that allocate in chunks instead of one row at a time.)

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