The ukeysort variant is slower than the others because converting from the IPv4 dot notation to an unsigned int in Perl is much, much, much, slower than calling inet_aton. If an XSUB were used to make the conversion ukeysort would be the fastest!

But anyway, as the data set size increases, the conversion cost from IPv4 to uint would become less decisive than the comparison function used inside the sort, and at some point the ukeysort solution would become the fastest of all the alternatives (and BTW, it also uses less memory! :-)

In reply to Re^3: Sorting IP addresses, lots of them, quickly by salva
in thread Sorting IP addresses, lots of them, quickly by gloryhack

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