I wrote about ghc-5.02.1 taking 13 times less memory than ghc-6.4 to compute a certain example like merge-sort. Now, I compare ghc-5.02.3 and ghc-6.4 on the same machine. The needed time and memory occur the same all right. The resources grow almost as O(n*log(n)), as expected. My error was that it was -H used for 5.03 instead of -M. With -M, they need the same time and space. Sorry for confusion. ----------------- Serge Mechveliani mechvel@botik.ru