Problems with MaxPossibleArrayBytes dropping while overall memory use does not change
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Commented: Jaroslaw Tuszynski on 13 Jul 2015
I a have a code where a data is processed in a long loop. Code is implemented a OOP class and all the memory is preallocated. Processing is going well until I suddenly I run out of memory. I started monitoring memory usage using "memory" function user.MemUsedMATLAB and class size never changes, but user.MaxPossibleArrayBytes seems to oscillate a lot with occasional spikes where minimum MaxPossibleArrayBytes goes to fraction of the median value. During one of such spikes my code crashes when minimum goes to 0.01% of the median value.
I am not sure how to debug this kind of issue or what might be causing it. I am running on a machine with 24 cores and 32 Gb of memory.
Walter Roberson on 13 Jul 2015
Generally speaking, MaxPossibleArrayBytes can reduce as a result of memory fragmentation. This is a significant problem with 32 bit MATLAB, but it is not usually a problem with 64 bit MATLAB unless you are using very large arrays.
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