>
> > 3. A segfault on OS X 10.5 32-bit Intel (bsd.math.washington.edu):
>
> > sage -t -long "devel/sage/sage/schemes/elliptic_curves/ell_finite_field.py"
> > A mysterious error (perphaps a memory error?) occurred, which may have
> > crashed doctest.
> > [22.7 s]
>
> > Doing this again with --verbose yields:
>
> > ----------------------------------------------
> > Trying:
> > for p in prime_range(Integer(10000)): #long time
> > (~20s)###line 1206:_sage_ >>> for p in prime_range(10000):
> > #long time (~20s)
> > if p != Integer(389):
> > G=E.change_ring(GF(p)).abelian_group()
> > Expecting nothing
>
> > error: no more memory
> > System 5120k:5120k Appl 4681k/438k Malloc 4095k/0k Valloc 1024k/438k
> > Pages 161/95 Regions 2:2
>
> > halt 14
> > [33.3 s]
> > exit code: 1024
> > ----------------------------------------------
>
> > Having this fail on a box with 8GB RAM is unacceptable (even if it is
> > 32-bit).
>
> This has been #3760 for a while. IIRC that doctest passes with Sage
> build in 64 bit mode on OSX, but it would not surprised me if this is
> pari related.
>
Hi,
as noted in the ticket #4179 which is referred to in ticket #3760, all
goes well even on 32bit mac if you change the lineline 1013 from
sage: for p in prime_range(10000): #long time (~20s)
to
sage: for p in prime_range(32768, 42768): #long time (~20s)
I had poked a bit around some time ago and it does not seem to be an
issue with not enough memory on a box (on my 2 GB MacIntel I could do
it with even larger prime ranges).
But things crash, as soon as the lower bound of the prime range is
lower than 2^15 == 32768, so I opened ticket #4181 for precisely that
issue.
Hmmm ... maybe I should test my potential fix (code snippet) at #5278
on my own computer (and I do not need access to Fedora 64 bit), maybe
it is somehow the same root cause, in light of the fix there is a
slight chance (if this computation somehow does involve Singular resp.
omalloc) ... but that has to wait till tomorrow.
Cheers,
gsw
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