Efficient count files in directory (no recursion)

perl -e 'if(opendir D,"."){@a=readdir D;print $#a-1,"\n"}'
time perl -e 'if(opendir D,"."){@a=readdir D;print $#a - 1,"\n"}' 205413 real 0m0.497s user 0m0.220s sys 0m0.268s time { ls |wc -l; } 205413 real 0m3.776s user 0m3.340s sys 0m0.424s ********* ** EDIT: turns out this perl liner is mostly masturbation. this is slightly faster: find . -maxdepth 1 | wc -l sh-3.2$ time { find . -maxdepth 1|wc -l; } 205414 real 0m0.456s user 0m0.116s sys 0m0.328s ** EDIT: now a slightly faster perl version perl -e 'if(opendir D,"."){++$c foreach readdir D}print $c-1,"\n"' sh-3.2$ time perl -e 'if(opendir D,"."){++$c foreach readdir D}print $c-1,"\n"' 205414 real 0m0.415s user 0m0.176s sys 0m0.232s

1
2009-07-23 20:14:33

What Others Think

what if you have to recurse? I don't know how to extend the perl to recurse, but it would be interesting to compare to find . -type f | wc -l On the speed difference, I'm guessing perl has an advantage since it really doesn't deal with the filename strings like ls must. Somehow ls|wc seems to use twice as much system call time as the perl but also spends more time in userspace presumably shuttling filenames around. Any ideas?
bwoodacre · 764 weeks and 4 days ago
And if it is the filename overhead, I wonder how much faster 'ls -i | wc -l' is.
bwoodacre · 764 weeks and 4 days ago
In my home, I got the following counts: $ find . -type f | wc -l 15812 $ perl -e 'if(opendir D,"."){@a=readdir D;print $#a-1,"\n"}' 109 $ ls |wc -l 14
kzh · 764 weeks and 3 days ago
@kzh you forgot to time the results, that is what is being measured! Also, your home dir is a bad place to test because there are many hidden files/directories which find/ls ignores as well as many levels of subdirs which perl or ls do not consider, that is why your file counts vary.
bwoodacre · 764 weeks and 3 days ago
~$ time perl -e 'if(opendir D,"."){@a=readdir D;print $#a - 1,"\n"}'280 real 0m0.117s user 0m0.010s sys 0m0.000s ~$ time { ls |wc -l; } 108 real 0m0.007s user 0m0.010s sys 0m0.000s Looks like your perl line does it ~15 times slower than the ls on my machine.
tedkozma · 764 weeks and 3 days ago
@bwoodacre you could do... perl -e 'use File::Find;$c=0;find sub {++$c;},".";print $c,"\n"' but it is not faster than find . | wc -l which made me realize that find . -maxdepth 1 | wc -l ...is faster than my original oneliner :} i'm going to make an edit with this comment
recursiverse · 764 weeks and 3 days ago
@tedkozma the perl liner should be faster on larger directories. my test directory had ~200k files.
recursiverse · 764 weeks and 3 days ago
a slight modification brings perl slightly ahead again (though not by much and only for very large directories)... perl -e 'if(opendir D,"."){++$c foreach readdir D}print $c,"\n"'
recursiverse · 764 weeks and 3 days ago
ls -U1 | wc -l is much faster because it doesn't have to read in the whole directory listing into memory and sort it
hfs · 715 weeks and 4 days ago
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wint · 37 weeks and 1 day ago
EVERYONE in the family Priority number one. We're small-scale, in-home breeders. We're not a facility or a kennel; we're a group of Pug enthusiasts who are utterly smitten with our adorable kids. Perfect House of Pugs is just breathtaking! Our Pugs have the best temperaments and personalities. They are created specifically for families looking for a high-quality Pug puppy. With over 18+ years, we have fought for only the finest standards, with our Pugs' health as our primary emphasis, which is why we put EVERYTHING into it, never cutting corners, always changing, and always improving. Our children are our greatest source of pride and delight. Our mission is to build connections (rather than merely sell puppies) and to bring pleasure and joy into your household. We are raising a Pug family and are certain that these puppies will become an integral part of your life. PLEASE VISIT OUR WEBSITE LINK BELLOW FOR MORE INFORMATION ABOUT PUG PUPPIES. PUG PUPPY ADOPTION Pug puppies for sale PUG PUPPIES FOR SALE NEAR ME PUG PUPPIES NEAR ME PUG PUPPIES FOR SALE UNDER 500 NEAR ME CUTE PUG PUPPIES BLACK PUG PUPPIES BLACK PUG PUPPIES FOR SALE PUG PUPPIES FOR ADOPTION BLACK PUG PUPPIES FOR SALE NEAR ME CHIHUAHUA PUG MIX PUPPIES TEACUP PUG PUPPIES HOW MUCH IS A PUG PUPPY BABY PUG PUPPIES PICTURES OF PUG PUPPIES PUG PUPPIES FOR SALE IN OHIO PUG PUPPIES FOR SALE IN PA PUG PUPPIES PRICE PUG MIX PUPPIES TEACUP PUG PUPPIES FOR SALE BABY PUG PUPPIES FOR SALE BEST FOOD FOR PUG PUPPY NEWBORN PUG PUPPIES PUG PUPPIES CRAIGSLIST PUG PUPPIES FOR SALE CRAIGSLIST WHITE PUG PUPPIES PUG PUPPIES FOR SALE IN MICHIGAN PUG PUPPIES FOR SALE UNDER 500 ADORABLE PUG PUPPIES BRINDLE PUG PUPPY HOW MUCH DOES A PUG PUPPY COST PITBULL PUG MIX PUPPIES PUGS FOR SALE NEAR ME PUG PUPPIES FOR SALE 200 PUG PUPPIES FOR SALE IN NJ PUG PUPPIES FOR SALE IN WISCONSIN PUG PUPPIES MICHIGAN PUG PUPPY COST MERLE PUG PUPPY FOR ADOPTION BEST PUG PUPPY FOOD ROYAL CANIN PUG PUPPY FOOD FAWN PUG PUPPY PUG PUPPIES FOR SALE FLORIDA PUG PUPPIES FOR SALE IN INDIANA PUG PUPPIES FOR SALE IN KY PUG PUPPIES FOR SALE IN NC PUG PUPPIES FOR SALE IN TEXAS PUG PUPPIES FOR SALE MN PUG DOG PUPPY AKC REGISTERED PUG PUPPIES FOR SALE PUG ALL BLACK CHEAP PUG PUPPIES FOR SALE NEAR ME PUGS PUPPIES FOR SALE CHEAP PUG PUPPIES FOR SALE IN CALIFORNIA MINIATURE PUG PUPPIES FOR SALE NEAR ME MINIATURE PUG PUPPIES FOR SALE CHEAP PUG PUPPIES FOR SALE IN NJ KNOWN FACTS ABOUT PUG PUPPIES ADOPT PUG PUPPIS RESCUE A PUG PUPPY PERFECT HOUSE OF PUGS PUG PUPPIES INSTAGRAM PINTEREST QUORA Google Page USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA
pugpuppies95 · 33 weeks and 6 days ago

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