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radix sort
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OpenJDK 64-Bit Server VM 11.0.4+11-LTS on Linux 3.10.0-862.3.2.el7.x86_64
Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz
radix sort 25000000:                      Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
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reference TimSort key prefix array                15588          15592           6          1.6         623.5       1.0X
reference Arrays.sort                              3367           3377          14          7.4         134.7       4.6X
radix sort one byte                                 436            447          10         57.3          17.5      35.7X
radix sort two bytes                                875            885           9         28.6          35.0      17.8X
radix sort eight bytes                             3409           3429          27          7.3         136.4       4.6X
radix sort key prefix array                        5985           6058         104          4.2         239.4       2.6X


