Thanks Alex - I've made both of these changes. The shutdown-agents did get rid 
of the pause at the end of the pmap solution, and the -server argument made a 
very slight across-the-board performance improvement. But neither of them 
fundamentally change the basic result (that the implementation that uses 
foldable-seq gives a 3x speedup and the other implementations are slower than 
the sequential version).

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On 28 Sep 2013, at 21:47, Alex Miller <a...@puredanger.com> wrote:

> For your timings, I would also strongly recommend altering your project.clj 
> to force the -server hotspot:
> 
>   :jvm-opts ^:replace ["-Xmx1g" "-server"  ... and whatever else you want 
> here ... ]
> 
> By default lein will use tiered compilation to optimize repl startup, which 
> is not what you want for timing.
> 
> And I second Andy's (shutdown-agents) advice. 

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