Cafe, Using "prog +RTS -M1G -hy" for my program prog, I generate a heap profile as documented in [1]. There is one big block in the output graph labelled with "*" though, which is not very helpful. The star character isn't even mentioned in the documentation, I wonder what it represents. Thanks in advance, [1] http://www.haskell.org/ghc/docs/latest/html/users_guide/prof-heap.html#rts-o... -- Ozgur Akgun