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Sort refactored [message #36981]

Fri, 03 August 2012 19:20

mirek
Messages: 14290
Registered: November 2005

Ultimate Member

I have spent some time refactoring Sort algorithm, it should be now 15% - 30% faster and more resistant to "bad" input data (we are now using median of 3 and up to 2 partitioning reattempts with Random (mersene twister based) choice of new 3 elements to get the new pivot).

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Re: Sort refactored [message #37145 is a reply to message #36981]

Wed, 29 August 2012 18:06

mirek
Messages: 14290
Registered: November 2005

Ultimate Member

I have found that actual implementation does not behave well (is slow) when there are many duplicate values in the array; it should be now fixed by using "3-partition method" (introducing pivot partition of elements with the same value).

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