#14535: Mutability of Graphs
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Reporter: SimonKing | Owner: jason, ncohen, rlm
Type: enhancement | Status: needs_info
Priority: major | Milestone: sage-5.10
Component: graph theory | Resolution:
Keywords: mutability graph | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Simon King | Merged in:
Dependencies: #14524 | Stopgaps:
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Comment (by SimonKing):
Here is a little timing.
Without patch:
{{{
sage: K12 = graphs.CompleteGraph(12)
sage: K4 = graphs.CompleteGraph(4)
sage: def test(g,h):
....: g.delete_edges(h.edge_iterator())
....: g.add_edges(h.edge_iterator())
....:
sage: %timeit test(K12,K4)
10000 loops, best of 3: 118 us per loop
}}}
With patch:
{{{
sage: K12 = graphs.CompleteGraph(12)
sage: K4 = graphs.CompleteGraph(4)
sage: def test(g,h):
....: g.delete_edges(h.edge_iterator())
....: g.add_edges(h.edge_iterator())
....:
sage: %timeit test(K12,K4)
10000 loops, best of 3: 131 us per loop
sage: (131-118)/118.*100
11.0169491525424
}}}
So, there is a slow-down of 11% in this example. I don't know if in "real"
examples, the backend would be used (without slow-down) internally.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14535#comment:5>
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