#17384: Slowness when calling Graph(a_dictionary)
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Reporter: ncohen | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.5
Component: PLEASE CHANGE | Keywords:
Merged in: | Authors: Nathann Cohen
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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It has been reported by Jean Betrema on sage-devel [1] that building a
graph from a dictionary was actually quite slow
{{{
sage: d=graphs.Grid2dGraph(100,100).to_dictionary()
sage: %time Graph(d)
CPU times: user 2.67 s, sys: 20 ms, total: 2.69 s
Wall time: 2.63 s
Graph on 10000 vertices
}}}
This does not make any sense, and indeed it only comes from a miswritten
line in the code. After this branch is applied, it becomes
{{{
sage: d=graphs.Grid2dGraph(100,100).to_dictionary()
sage: %time Graph(d)
CPU times: user 104 ms, sys: 4 ms, total: 108 ms
Wall time: 97.2 ms
Graph on 10000 vertices
}}}
Nathann
[1] https://groups.google.com/d/msg/sage-devel/x3h4m3LjWkI/1HY80TsjxCoJ
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Ticket URL: <http://trac.sagemath.org/ticket/17384>
Sage <http://www.sagemath.org>
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