For any following pairwise_distance-OMG-parallelism-is-tough-in-Python thing, @dimpase solved it — so grateful! 
https://github.com/oliviaguest/pairwise_distance/issues/2 …
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Regardless — it's painfully slow.
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Check whether you get time speedup by increasing # cores. IMHO prototype I posted would not run without GIL, unless re-coded in Cython.
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I only have two cores sadly. At work I have a ton, so I'll try on Tuesday.
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I'm going to write this thing in serial code in C now just for "fun".

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step 1: to do geopy.distance.great_circle(a,b).km in C :-)
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hehehe yes I am actually going way slower because I'm struggling with remembering C https://en.wikipedia.org/wiki/Haversine_formula …
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Looks like there's something from OSGeo that might be useful? You may have already found this. https://github.com/OSGeo/proj.4/wiki/GeodesicCalculations …
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omg nice!!

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good catch, although no docs for the library interface. one has to dig into geod source...
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