#17120: Extreme speed regression in ramification_breaks() doctest
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Reporter: jdemeyer | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.4
Component: number fields | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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In sage-5.12, the following takes a bit over a second:
{{{
sage: K.<b> = NumberField(x^8 - 20*x^6 + 104*x^4 - 40*x^2 + 1156)
sage: %time K.galois_group().ramification_breaks(K.primes_above(2)[0])
CPU times: user 0.57 s, sys: 0.18 s, total: 0.75 s
Wall time: 1.32 s
{1, 3, 5}
}}}
In sage-6.3, it takes about 50s:
{{{
sage: K.<b> = NumberField(x^8 - 20*x^6 + 104*x^4 - 40*x^2 + 1156)
sage: %time K.galois_group().ramification_breaks(K.primes_above(2)[0])
CPU times: user 50.1 s, sys: 440 ms, total: 50.5 s
Wall time: 51 s
{1, 3, 5}
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/17120>
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