#13387: Improve MonoDict and TripleDict data structures
----------------------------------+-----------------------------------------
Reporter: nbruin | Owner: Nils Bruin
Type: enhancement | Status: needs_review
Priority: major | Milestone:
sage-duplicate/invalid/wontfix
Component: memleak | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Nils Bruin | Merged in:
Dependencies: #11521, #12313 | Stopgaps:
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Comment (by nbruin):
Yippee!! using `PyWeakref_GetObject` instead of calling weakrefs is indeed
a little faster:
{{{
sage: M=sage.structure.coerce_dict.MonoDict(23)
sage: M[ZZ]=1
sage: %timeit _=M[ZZ]
625 loops, best of 3: 211 ns per loop
sage: %timeit _=M[ZZ]
}}}
{{{
sage: x=-20
sage: def test():
....: for n in xrange(10**7):
....: _=QQ(x)
....:
sage: sage: time test()
Time: CPU 7.76 s, Wall: 7.79 s
}}}
{{{
sage: def test(RR):
....: for d in range(-20,0):
....: if abs(RR(quadratic_L_function__numerical(1, d,
10000) - quadratic_L_function__exact(1, d))) > 0.001:
....: print "Oops! We have a problem at d = ", d, "
exact = ", RR(quadratic_L_function__exact(1, d)), " numerical = ",
RR(quadratic_L_function__numerical(1, d))
....:
sage: time test(RealField(50))
Time: CPU 1.76 s, Wall: 1.77 s
}}}
So we shave a little more off (something like 30ns, i.e., some 15% on a
simple MonoDict lookup)
Apply trac_13387-rebased.patch trac_13387-fast-weakref-calls.patch
'''TODO:''' Further improvement: in the coercion framework, hardwire the
use of MonoDict, provide get and set cdef methods and call those to
eliminate further method lookup overhead.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13387#comment:12>
Sage <http://www.sagemath.org>
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