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Re: Re^3: Efficient processing of large directory

by BrowserUk (Pope)
on Oct 04, 2003 at 00:11 UTC ( #296436=note: print w/ replies, xml ) Need Help??


in reply to Re^3: Efficient processing of large directory
in thread Efficient processing of large directory

readdir is less efficient than glob if a subset of the directory contents is sought.


Examine what is said, not who speaks.
"Efficiency is intelligent laziness." -David Dunham
"When I'm working on a problem, I never think about beauty. I think only how to solve the problem. But when I have finished, if the solution is not beautiful, I know it is wrong." -Richard Buckminster Fuller
If I understand your problem, I can solve it! Of course, the same can be said for you.


Comment on Re: Re^3: Efficient processing of large directory
Re^5: Efficient processing of large directory
by Aristotle (Chancellor) on Oct 04, 2003 at 07:35 UTC
    Apart from the fact that the OP isn't looking for a subset.
    #!/usr/bin/perl use strict; use warnings; use Benchmark qw /cmpthese/; chdir shift or die; cmpthese -5 => { glob => sub { 1 while glob '*'; }, readdir => sub { opendir my $dh, '.' or die; 1 while readdir $dh; }, }; __END__ $ mkdir x ; cd x ; touch `seq 1 20000` ; cd .. $ perl glob_vs_readdir.pl x Benchmark: running glob, readdir for at least 5 CPU seconds... glob: 6 wallclock secs ( 4.02 usr + 1.07 sys = 5.09 CPU) @ 5.30 +/s (n=27) readdir: 6 wallclock secs ( 3.93 usr + 1.37 sys = 5.30 CPU) @ 65.28 +/s (n=346) Rate glob readdir glob 5.30/s -- -92% readdir 65.3/s 1131% --

    Makeshifts last the longest.

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