#5882: [with patch; not ready for review] implement general package for finitely
generated not-necessarily free R-modules
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Reporter: was | Owner: was
Type: enhancement | Status: new
Priority: major | Milestone: sage-4.0
Component: linear algebra | Keywords:
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Comment(by was):
The one remaining problem: Some of the bug fixes in linear algebra
included in this patch (or possibly, but unlikely, the dependency
patches), cause a serious performance regression:
IN SAGE-3.4.1:
{{{
sage: time EllipticCurve('858k2').sha().an_padic(Integer(7))
CPU times: user 8.65 s, sys: 0.37 s, total: 9.02 s
}}}
After these patches the same takes much much longer (many minutes). Using
{{{set_verbose(2)}}} one sees that the codepaths are different.
It's not surprising that fixing bugs would uncover other buggy code and
major performance issues, since buggy code is often very fast :-).
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5882#comment:9>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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