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I have some problems getting profiling to work with a ghc-6.4 that I compiled from source. Everything seems to work all right, but the output doesn't contain any times; in time profiling (+RTS -p) times are all zeros, with heap profiling, I never get any 'samples' output, just an empty one.

I can go back to see if there's anything I configured incorrectly, but this sounds weird enough that I thought I'd ask the list if this is a known problem (preferably with a known solution). Is it?

(ghc 6.4 compiled from source with ghc 6.2.2 on Ubuntu 5.04, Linux 2.6.12-rc2)

It's not a known problem. Is the program definitely running long enough to get any samples? (samples are by default every 0.02 seconds). If you 'strace' the program you should be able to see the calls to the OS to get the timestamp at various points. Cheers, Simon