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Re^2: Using Perl saves time....

by greenFox (Vicar)
on Jul 19, 2005 at 08:55 UTC ( [id://476006]=note: print w/replies, xml ) Need Help??


in reply to Re: Using Perl saves time....
in thread Using Perl saves time....

Your code is slow too, you need a suitably large directory to test properly- 

$ time perl -e 'print scalar(()=glob"*"),$/'
136631

real    0m4.810s
user    0m3.340s
sys     0m1.320s

$ time perl -le 'opendir f, $ARGV[0] or die $!;++$c while readdir f; p
+rint $c' .
136633

real    0m0.440s
user    0m0.400s
sys     0m0.040s

[download]

--
Murray Barton
Do not seek to follow in the footsteps of the wise. Seek what they sought. -Basho

Replies are listed 'Best First'.
Re^3: Using Perl saves time....
by sh1tn (Priest) on Jul 19, 2005 at 10:47 UTC
    You are right - glob is slower than readdir.
    My point is the short one-liner. Otherwise: 
    # time ls | wc -l
99999

real    0m1.850s
user    0m1.590s
sys     0m0.210s


# time perl -e '@_ =  glob"*";print$#_'
99998

real    0m1.462s
user    0m0.880s
sys     0m0.570s

# the best alternative:
# time perl -MIO::Dir -e '@_ = IO::Dir->new(".")->read;print$#_'
100000
real    0m0.680s
user    0m0.570s
sys     0m0.100s

    [download]


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