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Depends upon your filing system, but 2 x 2-digits means a max of 100 in the lower levels and 10,000 in the top. 2 x 3-digit, gives 1000 in teh lower levels and 100 in the top. Every filesystem I am aware of will handle those numbers with ease.

The latter probably works better for performance, but you'd have to do a few tests to be sure.

On my system it is much of a muchness at around 3 milliseconds per lookup/increment either way:

#! perl -slw use strict; use Time::HiRes qw[ time ]; mkdir 'myroot'; for my $l1 ( '00' .. '09' ) { mkdir "myroot/$l1"; for my $l2 ( '00' .. '09' ) { mkdir "myroot/$l1/$l2"; mkdir "myroot/$l1/$l2/$l1$l2$_" for '000' .. '999'; mkdir "myroot/$l1/$l2/$l1$l2$_/1" for '000' .. '999'; } } my $start = time; for( 1 .. 1000 ) { my $id = sprintf "%02u%02u%03u", int( rand 10 ), int( rand 10 ), in +t( rand 1000 ); my( $l1, $l2 ) = unpack 'a2a2', $id; opendir D, "myroot/$l1/$l2/$id/"; readdir D; readdir D; ## get rid of '.' & '..' my $count = readdir D; rename "myroot/$l1/$l2/$id/" . $count, "myroot/$l1/$l2/$id/" . ++$c +ount or warn "$! : $id : $count"; closedir D; } printf "2x2x7 took %f secs/lookup&increment\n", ( time() - $start ) / +1000; system "rd /q /s myroot"; mkdir 'myroot'; for my $l1 ( '000' .. '009' ) { mkdir "myroot/$l1"; for my $l2 ( '000' .. '009' ) { mkdir "myroot/$l1/$l2"; mkdir "myroot/$l1/$l2/$l1$l2$_" for '0' .. '9'; mkdir "myroot/$l1/$l2/$l1$l2$_/1" for '0' .. '9'; } } $start = time; for( 1 .. 1000 ) { my $id = sprintf "%03u%03u%01u", int( rand 10 ), int( rand 10 ), in +t( rand 10 ); my( $l1, $l2 ) = unpack 'a3a3', $id; opendir D, "myroot/$l1/$l2/$id/" or warn "$! : myroot/$l1/$l2/$id/" +; readdir D; readdir D; ## get rid of '.' & '..' my $count = readdir D; rename "myroot/$l1/$l2/$id/" . $count, "myroot/$l1/$l2/$id/" . ++$c +ount or warn "$! : $id : $count"; closedir D; } printf "3x3x7 took %f secs/lookup&increment\n", ( time() - $start ) / +1000; system "rd /q /s myroot"; __END__ C:\test>1032393 2x2x7 took 0.002671 secs/lookup&increment 3x3x7 took 0.002761 secs/lookup&increment C:\test>1032393 2x2x7 took 0.002628 secs/lookup&increment 3x3x7 took 0.003111 secs/lookup&increment

BTW: Please note the additional readdir D; readdir D; ## get rid of '.' & '..' which I forgot above.


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In reply to Re^5: Daily Counters by BrowserUk
in thread Daily Counters by docbrown25

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