#15654: Extremely slow PARI discriminants
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Reporter: jdemeyer | Owner:
Type: defect | Status: new
Priority: critical | Milestone: sage-6.1
Component: performance | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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This is weird and bad:
{{{
sage: x = polygen(ZpFM(3,10))
sage: p = ((x-1)^50 + x)._pari_init_()
sage: %time pari(p).poldisc()
CPU times: user 59.20 s, sys: 0.01 s, total: 59.21 s
Wall time: 59.35 s
2*3 + 3^4 + 2*3^6 + 3^7 + 2*3^8 + 2*3^9 + O(3^10)
sage: %time gp(p).poldisc()
CPU times: user 0.00 s, sys: 0.01 s, total: 0.01 s
Wall time: 0.16 s
2*3 + 3^4 + 2*3^6 + 3^7 + 2*3^8 + 2*3^9 + O(3^10)
}}}
The problem isn't PARI itself (given the speed of `gp`), it's somehow the
PARI interface in Sage.
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Ticket URL: <http://trac.sagemath.org/ticket/15654>
Sage <http://www.sagemath.org>
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