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Re: IP Address sorting

by tadman (Prior)
on Feb 13, 2001 at 08:13 UTC ( #58077=note: print w/replies, xml ) Need Help??

in reply to IP Address sorting

japhy's code is certainly very quick, Benchmarking about 43% better than anything I could come up with on short notice. The 'radix_sort' is obviously more efficient for this kind of application than the built in sort of Perl.

However, under Perl 5.6 + strict + '-w', the following change is required to avoid compilation errors:
sub IPsort { map inet_ntoa($_), IP_radix_sort map inet_aton($_), @_; }
The alternative code which Benchmarks in at #2, but has the advantage of simplicity:
sub byip { inet_ntoa($a) cmp inet_ntoa($b) } foreach (sort byip @ip_list) ...
BTW, I tested both with 100_000 random IP addresses by 10 runs (approx 86 to 150s per test).

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Re: Re: IP Address sorting
by japhy (Canon) on Feb 13, 2001 at 19:47 UTC

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