#864: Asymptotically slow PARI --> Python long conversions
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Reporter: craigcitro | Owner: craigcitro
Type: enhancement | Status: needs_review
Priority: minor | Milestone: sage-5.12
Component: performance | Resolution:
Keywords: pari | Merged in:
Authors: Peter Bruin | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Changes (by {'newvalue': u'Peter Bruin', 'oldvalue': ''}):
* status: new => needs_review
* author: => Peter Bruin
* component: interfaces => performance
* upstream: => N/A
Comment:
I am uploading a patch that implements conversion from PARI `t_INT` to
Python long via an intermediate `mpz_t`, so `long(y)` essentially does
`long(Integer(y))`.
Some timings:
{{{
sage: x = 10^1000000
sage: %timeit y=pari(x)
10000 loops, best of 3: 197 us per loop
sage: %timeit z=Integer(y)
100 loops, best of 3: 4.11 ms per loop
sage: %timeit u=long(y)
100 loops, best of 3: 13 ms per loop
sage: %timeit u=long(Integer(y))
100 loops, best of 3: 13.8 ms per loop
sage: x = 10^10000000
sage: %timeit y=pari(x)
100 loops, best of 3: 5.57 ms per loop
sage: %timeit z=Integer(y)
100 loops, best of 3: 2.94 ms per loop
sage: %timeit u=long(y)
100 loops, best of 3: 13.9 ms per loop
sage: %timeit u=long(Integer(y))
100 loops, best of 3: 13.8 ms per loop
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/864#comment:4>
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