#9882: slow random_element() for integer mod ring
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Reporter: dmharvey | Owner: tbd
Type: defect | Status: new
Priority: major | Milestone:
Component: performance | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by ppurka):
Replying to [comment:2 mmezzarobba]:
> But I don't understand where the time goes:
All of the time goes in returning an element of the integer mod ring.
{{{
sage: R = Integers(3^20)
sage: a = 3^20; b = a+1
sage: %timeit ZZ.random_element(-a, b)
1000000 loops, best of 3: 705 ns per loop
sage: %timeit R(ZZ.random_element(-a, b))
100000 loops, best of 3: 2.07 us per loop
sage: c = a-1
sage: %timeit R(c)
1000000 loops, best of 3: 749 ns per loop
sage: c = (a-1)/2
sage: %timeit R(c)
100000 loops, best of 3: 7.71 us per loop
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/9882#comment:3>
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