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Does the Q/K implementation actually execute in parallel? I've always had a hard time figuring out exactly why K is supposed to be so fast (except for column stores, interpreter fitting in L1 cache, and fast hand-written primitives).

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Yes, you can start the server with any number of slave processors. As long as you're not writing data to global namespace (i.e, if you can keep your code purely functional), then as pointed out above, one can use the "peach" (parallel each) operator [1] to parallelize execution. Further you also get the "distributed each" to distribute load amongst multiple processes instead of threads [2]

[1] http://code.kx.com/wiki/Reference/peach

[2] http://code.kx.com/wiki/Reference/peach#Peach_using_multiple...

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