Hello all, I entered a little proposal in the issue tracker: http://hackage.haskell.org/trac/summer-of-code/ticket/1570 As I see it, the graphical part could be a warm-up exercise with an already useful product, and interaction with the rts would be the actual challenge. Reasoning about laziness is far from trivial (at least I often feel lost when trying to grok all the interaction within Reactive ;), and being able to browse profiler output on the spot is something I felt the need for a few times already. Eventually, this could be a contribution to an IDE project, even though it could as well remain a standalone application for all the emacs/vi folk. Profiling tools for parallel programs are in the make already, but I haven't seen anything more convenient than hp2ps and little add hoc solutions for analysing resource usage patterns. How do you all go about profiling? Gergely -- http://www.fastmail.fm - Does exactly what it says on the tin