>
>  (alter-var-root pool #(.setParallelism % 6))
>

Sorry for the nitpick, but that would just have been (.setParallelism pool
6), were it possible.


> I need to call the ctor and somehow rebind the 'pool' var to that object.
> How do I do that? any ideas?

(alter-var-root #'clojure.core.reducers/pool (constantly (ForkJoinPool. 6)))

var-set only works on dynamically bound vars.

> Would 'compare-and-set!' work in this case? are all vars wrapped in atoms?


No, vars are much more primitive; basically wrappers around a volatile
field, or a ThreadLocal, when dynamically bound. Their 'concurrency
semantics' is just good old stochastic 'last one in wins'. So they should
normally be considered read-only, except for special use cases like repl,
testing, crude hacks, ...

kind regards

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