On May 2, 1:00 pm, mabshoff <mabsh...@googlemail.com> wrote:
> On May 2, 2:58 am, Alex Ghitza <aghi...@gmail.com> wrote:
<SNIP>
> > I played around with prime_pi() for a while, both on sage.math and on
> > my laptop at the office (macbook running 32-bit archlinux). I didn't
> > manage to get a segfault on either machine with prime_pi(2^50). I
> > guess that's the good news?
>
> Somewhat. As it turns out 3.4.2.a0 does not blow up, but 3.4.1 does:
>
> mabsh...@sage:/scratch/mabshoff/sage-3.4.2.final$ sage
> ----------------------------------------------------------------------
> | Sage Version 3.4.1, Release Date: 2009-04-21 |
> | Type notebook() for the GUI, and license() for information. |
> ----------------------------------------------------------------------
> sage: time prime_pi(2^50)
> /usr/local/sage/local/bin/sage-sage: line 198: 13649 Segmentation
> fault sage-ipython "$@" -i
> mabsh...@sage:/scratch/mabshoff/sage-3.4.2.final$ ./sage
> ----------------------------------------------------------------------
> | Sage Version 3.4.2.rc0, Release Date: 2009-04-30 |
> | Type notebook() for the GUI, and license() for information. |
> ----------------------------------------------------------------------
> sage: time prime_pi(2^50)
> <SNIP>
Ok, in hindsight it is pretty obvious why this doesn't segfault in
3.4.2.a0 any more:
mabsh...@sage:/scratch/mabshoff/sage-3.4.2.final$ ./sage
----------------------------------------------------------------------
| Sage Version 3.4.2.rc0, Release Date: 2009-04-30 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
sage: len(prime_range(2^50))
/scratch/mabshoff/sage-3.4.2.final/local/bin/sage-sage: line 198:
13833 Segmentation fault sage-ipython "$@" -i
So I am rewriting the tickets: #5943 is about the still existing crash
in 3.4.2.final while #5963 is about the wrong results for prime_pi()
on some platforms.
Cheers,
Michael
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