On Mon, Oct 27, 2003 at 12:00:04PM -0500, glasgow-haskell-users-request@haskell.org wrote:
When I compile my program without "-prof -auto-all" option (no profiling support), its execution time is about 140s (compiled with -O2). When compiled with profiling support, the time spent by the program is about 180s (I used my own timer to measure this). Of course, the additional 40s is caused by the profiling annotation code. However, the profiler says (in the ".prof" file produced at the end of execution) that the time spent is about 85s. I suppose that the time measured by the profiler is only for evaluation of the main function of my program (I have compiled all modules with "-prof-all"). But what kind of computation is performed in the rest 95s (180s - 85s) ????? Garbage collection ???
Yes, it's probably garbage collection. To be sure, you can run your program with the "-t" RTS option, which will create a file in the current working directory named "foo.stat" if the executable is named "foo". The resulting file will contain the total amount of time spent, the mutator time, and the GC time. (I recently ran into this problem myself...) -- Kirsten Chevalier * krc@cs.berkeley.edu * Often in error, never in doubt "But just because we're conditioned to view some things as disgusting and immoral doesn't mean that some things aren't, in actual point of fact, disgusting and immoral. Human sacrifice, for instance. Or cannibalism. Or Ann Coulter." -- Dan Savage http://www.cs.berkeley.edu/~krc/