I cut and paste the code from http://blog.moertel.com/articles/2004/03/13/concurrent-port-scanner-in-haske... And compiled the resulting portscan.hs with both ghc-6.8.2 and ghc-6.6.1 on a host with Sun-Sparc [SunOS 5.10]. Besides the issue of binary-code-size blow-up with ghc-6.8.2, there is a much more serious problem with codes compiled from both 6.8.2 and 6.6.1. Here is the output of two runs. ------------------------------------------- portscan a_remote_sun_sparc_machine 1 1000 portscan: internal error: getMBlock: mmap: Bad file number (GHC version 6.6.1 for sparc_sun_solaris2) Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug Abort [ note: same result for 6.8.2 ] ---------------------------------------- portscan a_remote_linux_machine 1 1000 22 ssh 111 sunrpc 513 login 514 shell 631 ------------------------------------------ Anyone knows this problem ? --hp