#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):
Okay this is even more interesting and it indicates the problem is not
really in the backend per se.
{{{
sage: G = graphs.RandomBarabasiAlbert(1000,2)
sage: %timeit E = [(u,v) for u in G for v in G.neighbor_iterator(u)]
1000 loops, best of 3: 1.68 ms per loop
}}}
BUT:
{{{
sage: S = SparseGraph(1000)
sage: for i,j in G.edges(labels=False): S.add_arc(i,j)
sage: %timeit E = [(u,v) for u in S.verts() for v in S.out_neighbors(u)]
1000 loops, best of 3: 374 us per loop
}}}
'''What do you guys thin is going on here?'''
As for your static graphs thing If nobody wakes up then I promise to
review it by the weekend! :-)
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Ticket URL: <http://trac.sagemath.org/ticket/13730#comment:28>
Sage <http://www.sagemath.org>
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