You can view the time and allocation profiling graph of your program graphically, using ghcprof. This is a new tool with GHC 4.08, and will eventually be the de-facto standard way of viewing GHC profiles^[6]

To run ghcprof, you need daVinci™ installed, which can be obtained from The Graph Visualisation Tool daVinci. Install one of the binary distributions^[7], and set your DAVINCIHOME environment variable to point to the installation directory.

ghcprof uses an XML-based profiling log format, and you therefore need to run your program with a different option: -px. The file generated is still called <prog>.prof. To see the profile, run ghcprof like this:

$ ghcprof <prog>.prof

which should pop up a window showing the call-graph of your program in glorious detail. More information on using ghcprof can be found at The Cost-Centre Stack Profiling Tool for GHC.