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Re:Ask HN: Why Is My VPN's IPs Blocked from Hacker News? by dang on Thursday January 04, 2018 @01:02PM (#16072467)
Arc is implemented in Racket and uses its green threads, which don't do multiprocessing.
Re:Ask HN: Why Is My VPN's IPs Blocked from Hacker News? by soegaard on Thursday January 04, 2018 @06:44PM (#16075178)
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