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high physicial memory usage

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hello, I'm working with a script that does the folowing: 1. load a file (high reslolution audio file: 5 seconds long about 2.5mb) 2. run a apectrogram on the audio file 3. save the figure as a jpeg 4. repeat 1440 times. when i'm running the script, the physical memory that matlab is using keeps getting higher and higher untill it reaches 100% (about 35gb) and stops (crashes). my question is, why would the memory usage keep rising? and are there ways to fix this problme?
  3 Comments
ytzhak goussha
ytzhak goussha on 3 Apr 2018
:
function spectrofun2(rawClip,filename,subdirname)
%this function gets a mat clip,a file name, and a dir name
%and runs a spectrocram on it. after that it saves the figure as a jpeg
%at each sub-folder
figure1=figure; %open a figure
set(figure1, 'Visible', 'off');
spectrogram(rawClip.values,1024,512,1024,2.5E5,'yaxis'); %run the spectrogram
%colormap jet; %define color map
dim = [.13 .69 0.3 .3]; %define anotaion for the figure
str = filename;
str2= strrep(str,'_','-'); %if there's a '_' in the name, replace it with '-'
annotation('textbox',dim,'String',str2,'FitBoxToText','on');
if exist('subdirname','var')
jpegname=[str,'.jpg'];
figname=[str,'.fig'];
%dirname=jpegname(1:2);
dirname='figures_no_filter';
pathname=[dirname,'/',subdirname];
if ~exist(pathname,'dir') %create a folder with the hour as name
mkdir (pathname)
end
fullname_jpeg=[pathname,'/',jpegname];
fullname_fig=[pathname,'/',figname];
saveas(figure1,fullname_jpeg)
end
end

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Accepted Answer

Guillaume
Guillaume on 3 Apr 2018
Each time you call spectrofun2 you create a new figure. You never close the figure, so if you're processing 1400 files, you'll end up with 1400 open figures. You can't see these figures since you've set their visibility to off. That's also why clear did not have any effect. close all would have had.
The fix is simple add
close(figure1)
as the last line of spectrofun2 (before the end obviously).
------
Unrelated, if you're on R2016b or later, your code can be greatly simplified as dir lets you obtain all the files in subfolders directly.
filelist = dir(*/*.mat); %requires R2016b or later
would get all the mat files in the subfolders of the curent folder.
------
Also unrelated,
fullList(1:2)=[]; %detele first 2 '.','..'
is not a safe way of getting rid of '.' and '..' as there's no guarantee that these two will be the first two directories returned by dir (They won't be if another directory starts with any of !"#$%&'()*+,-). This is guaranteed to work:
fullList(ismember({fullList.name}, {'.', '..'})) = [];
  1 Comment
ytzhak goussha
ytzhak goussha on 3 Apr 2018
wow, thank you so much! that was very observant of you, i wouln't have figured this out alone. and thanks for the other tips. i will implement them.

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