I have this little demo which I use for sixth formers which includes
calculating in fairly rapid order the sum of the digits of the 10^9th Fibonacci number. (I haven't got enough physical memory to do the same for the 10^10th number without thrashing...) It fell over on a flashy new macbook I was going to use for the presentation the other day; indeed I found I couldn't even calculate the sum of the digits of the 10^6th number. I've reduced the problem to calculating numbers as large as 2^10000000 (as an Integer, of course), which works on all the ghci 7.8.4 implementations I can find on various machines around the department, but which falls over on the 8.0.1 implementation on my macbook. 2^1000000 is fine, but 2^10000000 causes a bus error which may well be a stack overflow in libHSinteger-gmp-1.0.0.1-ghc8.0.1.dylib I don't seem to have easy access to 8.0.1 elsewhere or other implementations on a mac. Does anyone have a handle on whether this is a problem with the sizing of the mac implementation or whether it is a pervasive 8.0.1 problem? Either way, it doesn't seem friendly that it manifests as an uncaught bus error. _______________________________________________ Glasgow-haskell-users mailing list [hidden email] http://mail.haskell.org/cgi-bin/mailman/listinfo/glasgow-haskell-users |
I'm not a GHC developer but I think you should report a bug here: https://ghc.haskell.org/ I've done it a couple of times and if you provide a reproducible test case it will usually get looked at at some point. Managing all the bugs on a mailing list would be a nightmare. If you're worried it might not actually be a bug well they can always just close it. On Fri, Dec 9, 2016 at 10:43 AM, Geraint Jones <[hidden email]> wrote: I have this little demo which I use for sixth formers which includes _______________________________________________ Glasgow-haskell-users mailing list [hidden email] http://mail.haskell.org/cgi-bin/mailman/listinfo/glasgow-haskell-users |
In reply to this post by Geraint Jones
Geraint Jones <[hidden email]> writes:
> I have this little demo which I use for sixth formers which includes > calculating in fairly rapid order the sum of the digits of the > 10^9th Fibonacci number. (I haven't got enough physical memory to > do the same for the 10^10th number without thrashing...) It fell > over on a flashy new macbook I was going to use for the presentation > the other day; indeed I found I couldn't even calculate the sum of > the digits of the 10^6th number. > For the record this was reported as GHC #12954. Cheers, - Ben _______________________________________________ Glasgow-haskell-users mailing list [hidden email] http://mail.haskell.org/cgi-bin/mailman/listinfo/glasgow-haskell-users signature.asc (463 bytes) Download Attachment |
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