Clojure program not exiting when finishing last statement?

Question

What would cause a Clojure program to not immediately exit upon finishing the last statement in the main function?

All I did was to change a (doall (map ...))<

Answer 1

According to the docs:

...[pmap is O]nly useful for computationally intensive functions where the time of f dominates the coordination overhead.

So this probably means there is more overhead using pmap for your scenario than using map. The pmap operations are probably taking a little extra time to finish up before the code after pmap fires.