in reply to
Re^3: Finding longest palindrome from a string (optimizing Perl)
in thread Finding longest palindrome from a string
Your benchmarking is not fair. The place is hihgly dependend on input data. E.g. if you use only 'abcdedcbabcdefgfedcbabcdefghijklmnonmlkjihgfedcbabcdefghijklkjihgfedcbabcdefghijklmnoponmlkjihgfedcba' you get other results.
I can't imagine a fair benchmark because it must go through all possible permutations for short and very very long strings. Or it must use random input data and calculate the statistics.