#15978: Waste of time in g.edges() (acually in iterator_edges)
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Reporter: | Owner:
ncohen | Status: needs_review
Type: | Milestone: sage-6.2
enhancement | Resolution:
Priority: major | Merged in:
Component: graph | Reviewers:
theory | Work issues:
Keywords: | Commit:
Authors: | 768a63ea1d24e569a254f99b01b1f4c568198bc9
Nathann Cohen | Stopgaps:
Report Upstream: N/A |
Branch: |
u/ncohen/15978 |
Dependencies: |
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Description changed by ncohen:
Old description:
> Jernej reported that Sage took <a lifetime> to enumerate the edges of an
> important graph of his. There was actually a comment in the source code
> which I left then forgot, saying that this particular block of code was
> totally awful.
>
> Was.
>
> With the latest release :
>
> {{{
> sage: %time _ = g.edges()
> CPU times: user 1min 24s, sys: 8 ms, total: 1min 24s
> Wall time: 1min 24s
> }}}
>
> With this branch :
>
> {{{
> sage: g = graphs.CompleteGraph(3000)
> sage: %time _ = g.to_dictionary()
> CPU times: user 1.38 s, sys: 0 ns, total: 1.38 s
> Wall time: 1.37 s
> sage: %time _ = g.edges()
> CPU times: user 6.88 s, sys: 0 ns, total: 6.88 s
> Wall time: 6.88 s
> }}}
>
> Which still does not make any sense.
>
> Nathann
New description:
Jernej reported that Sage took <a lifetime> to enumerate the edges of an
important graph of his. There was actually a comment in the source code
which I left then forgot, saying that this particular block of code was
totally awful.
Was.
With the latest release :
{{{
sage: g = graphs.CompleteGraph(3000)
sage: %time _ = g.to_dictionary()
CPU times: user 1.38 s, sys: 0 ns, total: 1.38 s
Wall time: 1.37 s
sage: %time _ = g.edges()
CPU times: user 1min 24s, sys: 8 ms, total: 1min 24s
Wall time: 1min 24s
}}}
With this branch :
{{{
sage: g = graphs.CompleteGraph(3000)
sage: %time _ = g.to_dictionary()
CPU times: user 1.38 s, sys: 0 ns, total: 1.38 s
Wall time: 1.37 s
sage: %time _ = g.edges()
CPU times: user 6.88 s, sys: 0 ns, total: 6.88 s
Wall time: 6.88 s
}}}
Which still does not make any sense.
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/15978#comment:2>
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