Out of curiosity I implemented an option for parallel processing
single thread: "Elapsed time: 39.275432 msecs"
parallel: "Elapsed time: 271.072837 msecs"
Ouch! I guess all that merging was a bad idea :) Obviously mutating in
place would get around that, I could use an unprotected java array as
the ij iteration is independent. However I'm just curious if there is
a less drastic solution I'm overlooking here? I suspect that using
preduce instead of merging may be the trick - but I haven't installed
the required preduce libs yet (may try it later).

Code in the same place:
http://github.com/timothypratley/strive/blob/master/clj/sandpit/fw.clj

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