Radsort is a stable LSD radix sort requiring O(√n) additional space, competitive with or faster than conventional out-of-place LSD radix sort for arrays above ~2 MiB.
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Parallel $\mathcal O(\sqrt n)$ Overhead LSD Radix Sort
Radsort is a stable LSD radix sort requiring O(√n) additional space, competitive with or faster than conventional out-of-place LSD radix sort for arrays above ~2 MiB.