#18987: Parallel computation for TilingSolver.number_of_solutions
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Reporter: | Owner:
slabbe | Status: needs_review
Type: | Milestone: sage-6.9
enhancement | Resolution:
Priority: major | Merged in:
Component: | Reviewers: Vincent Delecroix
combinatorics | Work issues:
Keywords: | Commit:
Authors: | 0d68ecec28cb92d9e78a92d6e733d42b3e8941c1
Sébastien Labbé | Stopgaps:
Report Upstream: N/A |
Branch: |
public/18987 |
Dependencies: |
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Comment (by slabbe):
> Where?! Beyond the construction of the group (`SymmetricGroup(4) is
SymmetricGroup(4)` gives `True`) nothing is cached.
Don't you get that the first execution of
{{{
sage: time S = [m*s.matrix() for m in M for s in SymmetricGroup(4)]
}}}
is slower than the second? And that the second takes about the same time
than the third, the fourth, etc. ? Like me:
{{{
sage: from itertools import product
sage: M = [diagonal_matrix(p) for p in product([1,-1], repeat=4)]
sage: time S = [m*s.matrix() for m in M for s in SymmetricGroup(4)]
CPU times: user 184 ms, sys: 18 ms, total: 202 ms
Wall time: 710 ms
sage: time S = [m*s.matrix() for m in M for s in SymmetricGroup(4)]
CPU times: user 109 ms, sys: 2.05 ms, total: 111 ms
Wall time: 166 ms
sage: time S = [m*s.matrix() for m in M for s in SymmetricGroup(4)]
CPU times: user 109 ms, sys: 2.6 ms, total: 111 ms
Wall time: 113 ms
sage: time S = [m*s.matrix() for m in M for s in SymmetricGroup(4)]
CPU times: user 110 ms, sys: 2.12 ms, total: 112 ms
Wall time: 169 ms
sage: time S = [m*s.matrix() for m in M for s in SymmetricGroup(4)]
CPU times: user 108 ms, sys: 2.44 ms, total: 111 ms
Wall time: 114 ms
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/18987#comment:50>
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