this may be a totally absurd request, but would it be possible to use ptrace or some other mechanism for poking a running program to cause a program to start generating profiling data or change what type of profiling data it is producing? I tend to view the profiling graph in real-time as I run my Haskell program interactively. every now and again I notice my program is behaving oddly but I am unable to reproduce the events that led to the odd behavior. It would be nice to be able to poke the program in such a way to cause it to start writing profiling frames to the stack for a bit. is this plausible? John -- --------------------------------------------------------------------------- John Meacham - California Institute of Technology, Alum. - john@foo.net ---------------------------------------------------------------------------