[Swift-user] concurrent_mapper filenames

[Ben Clifford]

> I was expecting something like blowup/blowup-XXXX.dat .  But it
> doesn't matter since i'm only after the output.

Roughly, the XXXXX number gets covnerted into a digit sequence in some 
base, and then each digit is used to make a new directory level with the 
last digit being the actual file name.

The aim is to reduce the number of GPFS nodes accessing the same 
directory, which is/was a fairly serious scalability problem.

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