#8746: Equality of posets element is very slow
------------------------------+---------------------------------------------
Reporter: hivert | Owner: sage-combinat
Type: defect | Status: new
Priority: major | Milestone: sage-4.4
Component: combinatorics | Keywords: Comparison posets elements
Author: Florent Hivert | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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This is due to comparing the parent which can indeed be very slow. However
most of the time when comparing {{{x}}} and {{{y}}}, the two parent are
identical and are better compared with {{{is}}}. Here is the results:
Before the patch:
{{{
sage: P = Posets.ChainPoset(30)
sage: %time len([x == y for x in P for y in P])
CPU times: user 18.05 s, sys: 0.04 s, total: 18.09 s
Wall time: 18.25 s
900
}}}
After the patch:
{{{
sage: P = Posets.ChainPoset(30)
sage: %time len([x == y for x in P for y in P])
CPU times: user 0.03 s, sys: 0.00 s, total: 0.03 s
Wall time: 0.02 s
900
}}}
Cheers,
Florent
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8746>
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