On Oct 31, 9:55 pm, Jaap Spies <[EMAIL PROTECTED]> wrote:
> Hi Michael,
>
>
>
> > it should also be noted that the bug Carl mention above seems to be
> > the root cause for #973. I am currently updating to 2.8.10 on my local
> > box (which shows the segfault for dance(10)) to see if the problem is
> > really fixed. I added some additional info to #973 about this.
>
Hello Jaap,
> Seems to be fixed in sage-2.8.10!
>
It is, but I forgot to mention it in the other thread. The ticket has
been closed, but it would be great if you could submit the cleanup
patch for #217 in the next 36 hours. But it taught me about a new
class of refcounting bugs, so I don't consider the colossal amount of
time I spend tracking this issue down wasted :)
William had also suggested that you can merge dance() into the
official Sage distribution. Carl and I also talked about writing a
doctest for Cython to catch this kind of error should it ever pop up
again.
> sage: time dance(10)
> h^10 - 35*h^9 + 675*h^8 - 8610*h^7 + 78435*h^6 - 523467*h^5 + 2562525*h^4 -
> 9008160*h^3 + 21623220*h^2 - 31840760*h + 21750840
> CPU times: user 13256.06 s, sys: 56.28 s, total: 13312.34 s
> Wall time: 13606.78
>
> Jaap
Cheers,
Michael
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