#20693: Sage crashes when computing newforms
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Reporter: ehlen | Owner:
Type: defect | Status: new
Priority: critical | Milestone: sage-7.3
Component: modular forms | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by ehlen):
My old examples still crash with #20749 applied.
Unfortunately, it does not seem like these were very easy to compute with
sage 6.1; everything I tested so far runs in fact much slower in sage 6.1
(which is good, I guess). [Let me mention, although a bit off-topic, that
magma computes the newforms in weight 4 in the example above in 0.5s and
in weight 6 in 7.5s.]
Now, as for the crash, first of all there is no crash with #20749 when
running
{{{
N=Newforms(DirichletGroup(23).gen()^2,6, names='a')
}}}
However, I now get the more informative
{{{
PariError: the PARI stack overflows (current size: 2147483648; maximum
size: 2147483648)
You can use pari.allocatemem() to change the stack size and try again.
}}}
After doing so:
{{{
sage: pari.allocatemem(2147483648*4)
}}}
I get a crash again. For some reason this crash is not informative at all
on OSX, I will have to run it on Linux to see the backtrace, I guess.
Also, your level 17 example is quite good because by increasing the weight
only by one to 9, I the same behaviour (PARI stack overflow, crash when
increasing it). Try:
{{{
sage: c=DirichletGroup(17).gen()
sage: %time Newforms(c,9, names='a')
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/20693#comment:15>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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