[ezekg]

Just curious--why is HN run on only a single core?

[dang]

Arc is implemented in Racket and uses its green threads, which don't do multiprocessing.

[soegaard]

The standard Racket threads do run on a single core. Racket (not Arc) does however support two forms of parallelism, namely futures and places.

http://docs.racket-lang.org/guide/parallelism.html

[thomastjeffery]

I assume it doesn't handle any multithreading yet.