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big differences in saving variables

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Abolfazl Nejatian
Abolfazl Nejatian on 24 Sep 2020
Commented: Mario Malic on 26 Sep 2020
Hi,
i need to save some tables and variables as Mat and CSV files.
but I have faced a strange behavior on saving the files.
when I save my file and evaluate the time of each of them individually, the saving time much less than I evaluate total saving time.
I also should mention the true elapsed time is a bigger time.
here are my code and output,
folderAddress = 'D:\Nejatian\';
tic
delete([folderAddress 'signals.csv'])
delete([folderAddress 'LatestSignals.csv'])
t1 = toc;
tic
writetable(T,[folderAddress 'signals.csv']);
t2 = toc;
tic
writetable(lT,[folderAddress 'LatestSignals.csv'])
t3 = toc;
tic
save([folderAddress 'visualData'],'visualData')
t4 = toc;
tic
delete('workspace.mat')
save('workspace.mat');
t5 = toc;
str1 = string(['Deleting CSV files = ' num2str(t1) 'Sec']);
str2 = string(['Writing CSV file one = ' num2str(t2) 'Sec']);
str3 = string(['Writing CSV file one = ' num2str(t3) 'Sec']);
str4 = string(['Saving Mat file from a struct variable = ' num2str(t1) 'Sec']);
str5 = string(['Saving all workspace variables = ' num2str(t1) 'Sec']);
disp([str1;str2;str3;str4;str5]);
  • Deleting CSV files = 0.0320444Sec
  • Writing CSV file one = 1.99078Sec
  • Writing CSV file one = 0.273289Sec
  • Saving Mat file from a struct variable = 0.0120444Sec
  • Saving all workspace variables = 0.00220444Sec
and the total time is
tic
folderAddress = 'D:\Nejatian\';
delete([folderAddress 'signals.csv'])
delete([folderAddress 'LatestSignals.csv'])
writetable(T,[folderAddress 'signals.csv']);
writetable(lT,[folderAddress 'LatestSignals.csv'])
save([folderAddress 'visualData'],'visualData')
delete('workspace.mat')
save('workspace.mat');
t=toc;
str = string(['Total time = ' num2str(t) 'Sec']);
disp(str);
  • Total time = 78.3331Sec
why this big difference happens and how i can speed up my File saving time?
i mean is there any way to parallelize or decompressed the output for reducing the saving file?
  5 Comments
Mario Malic
Mario Malic on 26 Sep 2020
There's an option -nocompression, but I don't know if it would make things different.

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