#18215: Huge speed up for hash of quadratic number field elements
-------------------------------------+-------------------------------------
Reporter: vdelecroix | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.7
Component: number fields | Resolution:
Keywords: | Merged in:
Authors: Vincent Delecroix | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/vdelecroix/18215 | 2862b49015b1c47cd0827e72764826e32bdc13e7
Dependencies: | Stopgaps:
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Changes (by vdelecroix):
* cc: ncohen (added)
Old description:
> Before
> {{{
> sage: L.<a> = QuadraticField(-7)
> sage: b = a - 13/7
> sage: timeit("hash(b)")
> 625 loops, best of 3: 54 µs per loop
> }}}
> After
> {{{
> sage: L.<a> = QuadraticField(-7)
> sage: b = a - 13/7
> sage: timeit("hash(b)")
> 625 loops, best of 3: 97.7 ns per loop
> }}}
> ... looks like a x500 speed up :-)
New description:
Before
{{{
sage: L.<a> = QuadraticField(-7)
sage: b = a - 13/7
sage: timeit("hash(b)")
625 loops, best of 3: 54 µs per loop
}}}
After
{{{
sage: L.<a> = QuadraticField(-7)
sage: b = a - 13/7
sage: timeit("hash(b)")
625 loops, best of 3: 97.7 ns per loop
}}}
... looks like a x500 speed up :-)
As a consequence (and with #18213 applied)
Before
{{{
sage: %time gr = polytopes.great_rhombicuboctahedron()
CPU times: user 5.68 s, sys: 68 ms, total: 5.75 s
Wall time: 5.7 s
}}}
After
{{{
sage: %time gr = polytopes.great_rhombicuboctahedron()
CPU times: user 2.71 s, sys: 36 ms, total: 2.75 s
Wall time: 2.69 s
}}}
--
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Ticket URL: <http://trac.sagemath.org/ticket/18215#comment:4>
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