![]() Significantly better and should be retained for template libraries, in He reported that it could double the number ofĬache misses, but that its performance with double-ended queues was Small sorting, where small ranges are sorted at the end in a single Musser also considered the effect on caches of Sedgewick's delayed It was analyzed more recently by Musser (the inventor of Introsort). Note that this use of insertion sort also has a drawback - if you do it this way and there's a bug in your partition code then provided it doesn't lose any elements, just partition them incorrectly, you'll never notice.Įdit: apparently this modification is by Sedgewick, who wrote his PhD on QuickSort in 1975. If someone suspects selection sort might be better then the burden of proof lies on them to "prove" that it's faster. Neither bubble sort nor selection sort has this property, so I think the answer might quite simply be "convenience". This might not be faster, especially since it pulls the whole data through cache an extra time, but depending how the code is structured it might be convenient. So instead of calling it in your loop, you have the option to call it last. ![]() Insertion sort has the rather pleasing property that you can call it just once on that whole array, and it performs essentially the same as it does if you call it once for each block of 30. If you bail out of each branch of your divide-and-conquer Quicksort when it hits the threshold, your data looks like this. ![]()
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