On Wed, May 12, 2010 at 8:15 PM, Aran Donohue <[email protected]>wrote:
> Hi Cafe, > > I have a program that I can reliably cause to hang. It's concurrent using > STM, so I think it could be a deadlock or related issue. I also do some IO, > so I think it could be blocking in a system call. It only hangs when > compiled with -threaded. I tried building with -prof, and running with -hc > -xt to get a clue where in which function it is stopping, but the resulting > profile didn't help much. > Usually it's the other way around (hangs without threaded). So, I would guess that you're experiencing some sort of deadlock issue. > I've started sprinkling print statements, but I thought I'd trawl for > better tips and techniques. Any suggestions on approaches? > Try threadscope: http://research.microsoft.com/en-us/projects/threadscope/ I haven't used it myself but I've heard it's *the* tool for investigating parallel program behavior for haskell programs. Hope that helps, Jason
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