#13730: Speed up some graph iterations
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Reporter: dcoudert | Owner: jason, ncohen, rlm
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-5.11
Component: graph theory | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by azi):
And also the relevant profilings.. If they are of any help..
{{{
sage: G = graphs.RandomBarabasiAlbert(1000,2)
sage: %prun E = [(u,v) for u in G for v in G.neighbor_iterator(u)]
1003 function calls in 0.005 seconds
Ordered by: internal time
ncalls tottime percall cumtime percall filename:lineno(function)
1000 0.003 0.000 0.003 0.000
generic_graph.py:7848(neighbor_iterator)
1 0.002 0.002 0.005 0.005 <string>:1(<module>)
1 0.000 0.000 0.000 0.000
generic_graph.py:7794(vertex_iterator)
1 0.000 0.000 0.000 0.000 {method 'disable' of
'_lsprof.Profiler' objects}
sage: %prun E = [(u,v) for u in S.verts() for v in S.out_neighbors(u)]
1003 function calls in 0.001 seconds
Ordered by: internal time
ncalls tottime percall cumtime percall filename:lineno(function)
1 0.001 0.001 0.001 0.001 <string>:1(<module>)
1000 0.000 0.000 0.000 0.000 {method 'out_neighbors' of
'sage.graphs.base.sparse_graph.SparseGraph' objects}
1 0.000 0.000 0.000 0.000 {method 'verts' of
'sage.graphs.base.c_graph.CGraph' objects}
1 0.000 0.000 0.000 0.000 {method 'disable' of
'_lsprof.Profiler' objects}
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/13730#comment:29>
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