Hi all, Are there any known problems with retainer profiling in GHC 6.8.2? I have a program that takes 3 minutes to run with "normal" profiling enabled (+RTS -P -RTS), but with +RTS -P -hr -RTS, it's 20 minutes and counting. I can tell that progress is being made since the .hp file keeps getting bigger, but that seems like a lot of overhead. I can try to come up with a smaller test case if necessary; just wanted to see if there's any known problem. Cheers, Tim -- Tim Chevalier * http://cs.pdx.edu/~tjc * Often in error, never in doubt "The trouble with academia is that there's a lot of 'If you'll validate my program of Kumquat Studies I won't point out the uselessness of your doctorate in Nail File Studies.'" -- Sarah Barton
Tim Chevalier wrote:
Hi all,
Are there any known problems with retainer profiling in GHC 6.8.2? I have a program that takes 3 minutes to run with "normal" profiling enabled (+RTS -P -RTS), but with +RTS -P -hr -RTS, it's 20 minutes and counting. I can tell that progress is being made since the .hp file keeps getting bigger, but that seems like a lot of overhead.
I can try to come up with a smaller test case if necessary; just wanted to see if there's any known problem.
It certainly is slow, especially with large heaps, because IIRC it has to do multiple traversals of the heap. The +RTS -sstderr output will tell you how much time is spent doing retainer profiling. (also retainer profiling is often not terribly useful IMO). Cheers, Simon
participants (2)
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Simon Marlow -
Tim Chevalier