#10947: very slow matrix product
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Reporter: pang | Owner: tbd
Type: | Status: needs_review
enhancement | Milestone: sage-duplicate/invalid/wontfix
Priority: minor | Resolution:
Component: | Merged in:
performance | Reviewers:
Keywords: | Work issues:
Authors: | Commit:
Report Upstream: N/A | Stopgaps:
Branch: |
Dependencies: |
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Changes (by aapitzsch):
* status: new => needs_review
* milestone: => sage-duplicate/invalid/wontfix
Comment:
{{{
sage: var('t')
sage: curva = vector((sin(2*t), cos(2*t), 0))
sage: M = identity_matrix(RDF,3)
sage: %timeit M*curva
1000 loops, best of 3: 478 µs per loop
sage: %timeit sum(a*b for a,b in zip(curva,M.rows()))
1000 loops, best of 3: 321 µs per loop
}}}
after a restart of sage:
{{{
sage: var('t')
sage: curva = vector((sin(2*t), cos(2*t), 0))
sage: M = identity_matrix(RDF,3)
sage: %time M*curva
CPU times: user 6.67 ms, sys: 0 ns, total: 6.67 ms
Wall time: 4.67 ms
(sin(2*t), cos(2*t), 0)
sage: %time sum(a*b for a,b in zip(curva,M.rows()))
CPU times: user 3.33 ms, sys: 0 ns, total: 3.33 ms
Wall time: 3.77 ms
(sin(2*t), cos(2*t), 0)
}}}
So no significant difference here. Maybe because of an SSD.
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Ticket URL: <http://trac.sagemath.org/ticket/10947#comment:2>
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