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[Octave-bug-tracker] [bug #43327] dir function is too slow


From: Kai Torben Ohlhus
Subject: [Octave-bug-tracker] [bug #43327] dir function is too slow
Date: Wed, 7 Aug 2019 22:14:08 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.100 Safari/537.36

Follow-up Comment #10, bug #43327 (project octave):

On my machine Octave 5.1.0:


>> system ('ls -al /usr/bin/ | wc -l'); tic; l = dir ('/usr/bin/'); toc
3254
Elapsed time is 0.63308 seconds.


Octave dev (728e4d99febb):


>> system ('ls -al /usr/bin/ | wc -l'); tic; l = dir ('/usr/bin/'); toc
3254
Elapsed time is 0.665946 seconds.


So I agree on your measurement Rik, about 6000 files per second.  And just for
curiosity Matlab R2019a:


> system ('ls -al /usr/bin/ | wc -l'); tic; l = dir ('/usr/bin/'); toc
3254
Elapsed time is 0.016233 seconds.


This makes for Matlab roughly 200,000 files per second.

Regarding the original message, there is still no real improvement.  Assuming
"100kk = 1e8 = 100,000,000" files, this still means


>> 1e8/6000/3600
ans =  4.6296


four hours of waiting.  Matlab


>> 1e8/2e5/60
ans =  8.3333


needs eight minutes.  I think my definition of "kk" differs from the OP.

Bottom line, the performance is good enough for the average user today and I
suggest to close as won't fix.

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