The degenerate (1-letter) case: 

     20000  1 -5
kennethk     0.154/s
RobertCraven  7.55/s
xxx           23.0/s
hdb           28.5/s

[download]
The 4-letter case packs only 8 bits of data into 32-bit values and therefore performs poorly. With genomic data one would of course pack differently.

Much more importantly: is there no XS module for constructing suffix arrays? Seems like a very worthy problem.

In reply to Re^4: suffix array efficiency by oiskuu
in thread suffix array efficiency by RobertCraven

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