Hi guys! Since a while I'm playing around with JHC and wanted to ask something about the garbage collector(s). First, what is this "Boehm" thing? Is it some other garbage collector written by somebody else? I can't run it on my machine. The other thing: When I compile this* program with GC enabled, the output is random crap or it segfaults. What happens here? I should dig into it deeper. Possibly someone can give my some adivise, I guess it's mostly a matter of the arrays or something else. Yours, Robert Clausecker *: The program is available here: https://github.com/fuzxxl/BWInf in the folder Aufgabe4. Make shure to checkout the "performance" branch. I changed some stuff to make it compile with JHC, and reverted it afterwards. Sorry, as this was pure homework for some competition, I coded in German. I can try to translate it, but maybe it's understandable as is. The program calculates the expected result of some game or may play for n times. Given no parameters, it will analyze, with "-n -c ###" it will play n games. On GHC, it will run in constant space and 1000000 games are done in about 6 seconds. JHC is much worse.