#14214: Cythoned homsets
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Reporter: SimonKing | Owner: tbd
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-5.10
Component: performance | Resolution:
Keywords: Hom, cython, cached method | Work issues: How to store
domain and codomain?
Report Upstream: N/A | Reviewers:
Authors: Simon King | Merged in:
Dependencies: #14159, #12951, #13184 | Stopgaps:
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Comment (by SimonKing):
{{{
sage: cython("""from sage.all import Sets
from sage.structure.parent cimport Parent
cdef class Bla(Parent):
def __init__(self, domain, codomain):
try:
self._domain_ = domain
self._codomain_ = codomain
except AttributeError:
if self.__cached_methods is None:
self.__cached_methods = {'_domain_':domain,
'_codomain_':codomain}
else:
self.__cached_methods['_domain_'] = domain
self.__cached_methods['_codomain_'] = codomain
Parent.__init__(self, category= Sets())
""")
....:
sage: class Blubb(Bla): pass
sage: b = Bla(1,2)
sage: c = Blubb(1,2)
sage: %timeit x = b._domain_
1000000 loops, best of 3: 826 ns per loop
sage: %timeit x = c._domain_
10000000 loops, best of 3: 114 ns per loop
}}}
Hmmmm. If it is possible to set attributes directly, then it is faster
than a property. But otherwise, a property is much faster than using
`__cached_method` for attribute lookup, even if this property uses
`__cached_method`. And the property tends to become slower on sub-classes.
What a dilemma...
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14214#comment:37>
Sage <http://www.sagemath.org>
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