Memory not being cleared from iteration to iteration?
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Hello all,
I'm having a memory leakage somewhere in my code that I can't find. I have a matlab code that uses objects to read different files, process them and add the results to a database. In pseudocode, let's say:
for ii=1:numfiles
reader.readfile(ii);
processor.process(reader);
database.addresults(processor);
end
The "processor" object uses parfor inside. The pararllel pool is being created and deleted inside the "processor" object in each iteration. I'm running this loop over the same file several time and monitoring the ram usage (using "memory" command in windows, and monitoring the "MemAvailableAllArrays" field), and also the size of each object (using the "GetSize" function). The database is a huge matrix where I accumulate the results.
The MemAvailableAllArrays is decreasing from iteration to iteration. I thought that maybe one of the objects might be concatenating some vectors by mistake, increasing thus its size, but all objects sizes remain contant for iteration to iteration.
Any advise on how to find / solve where this memory "leak" is and/or how to solve it?
Edit: I tried with Matlab 2016b and 2020b, and same issue.
4 个评论
Stephen23
2021-2-3
"I monitored the memory usage with the MemAvailableAllArrays field of the memory command."
The MemAvailableAllArrays field gives the "Total memory available to hold data", it is not a measure of "memory usage" as you write. To measure current usage, use the MemUsedMATLAB field.
The first graph in your previous comment is confusing: did MemAvailableAllArrays contain negative values?
Just out of curiousity, how much memory does your PC have installed?
回答(1 个)
Aditya Patil
2021-2-1
As per my understanding, your code is using more memory than expected.
This might happen if you are creating many temporary variables, or if you are appending new values to a vector. You can look at the following resources for general tips on efficient memory usage in MATLAB.
8 个评论
Aditya Patil
2021-2-11
Using MemUsedMATLAB would be more appropriate than MemAvailableAllArrays. Without the code, it's difficult for me to say what causes the issue.
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