#15760: Speed up short vector enumeration
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Reporter: jdemeyer | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.1
Component: performance | Resolution:
Keywords: | Merged in:
Authors: Jeroen Demeyer | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by jdemeyer:
Old description:
> The `short_vector_list_up_to_length` method of quadratic forms uses GP
> but the interface is so badly done that essentially all time is taken up
> by the Sage interface, and not by the actual computation.
New description:
The `short_vector_list_up_to_length` method of quadratic forms uses GP but
the interface is so badly done that the majority of the time is taken up
by the Sage interface, and not by the actual computation. Still, even with
the new implementation, most time is taken by the conversion to vectors.
Timings before:
{{{
sage: qf = QuadraticForm(matrix(3, [2, 1, 1, 1, 2, 1, 1, 1, 2]))
sage: %timeit qf.short_vector_list_up_to_length(100)
1 loops, best of 3: 1.13 s per loop
sage: %timeit qf.short_vector_list_up_to_length(1000)
1 loops, best of 3: 6.74 s per loop
}}}
Timings after:
{{{
sage: qf = QuadraticForm(matrix(3, [2, 1, 1, 1, 2, 1, 1, 1, 2]))
sage: %timeit qf.short_vector_list_up_to_length(100)
10 loops, best of 3: 34.4 ms per loop
sage: %timeit qf.short_vector_list_up_to_length(1000)
1 loops, best of 3: 1.03 s per loop
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/15760#comment:1>
Sage <http://www.sagemath.org>
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