#14615: cythonize lazy_atrtibute
-------------------------------+--------------------------------------------
Reporter: nbruin | Owner: tbd
Type: enhancement | Status: new
Priority: major | Milestone: sage-5.10
Component: performance | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Comment (by nbruin):
As a comparison, with
{{{
cython("""
from sage.misc.lazy_attribute import lazy_attribute
cdef class T(object):
cdef public __cached_methods
@lazy_attribute
def t(self):
return 10
def s(self):
return 10
""")
}}}
we get
{{{
sage: t=T()
sage: %timeit t.t
10000000 loops, best of 3: 82.6 ns per loop
}}}
and with the old `lazy_attribute` we get:
{{{
1000000 loops, best of 3: 517 ns per loop
}}}
This puts (cached) lazy attribute access in a factor of 2 of accessing
`cdef public` members:
{{{
sage: %timeit t.__cached_methods
10000000 loops, best of 3: 42 ns per loop
}}}
Of course, if there's a dictionary available, the code for
`@lazy_attribute` doesn't matter for cached retrieval. To get a bit of an
idea of non-cached access costs with patch:
{{{
sage: %timeit T()
10000000 loops, best of 3: 78.4 ns per loop
sage: %timeit T().t
1000000 loops, best of 3: 1.15 us per loop
}}}
versus without patch:
{{{
sage: %timeit T().t
100000 loops, best of 3: 3.76 us per loop
}}}
so in this case there is still a reduction in overhead.Incidentally, we
have:
{{{
sage: %timeit t.s()
10000000 loops, best of 3: 59.5 ns per loop
}}}
so the overhead on calling the wrapped function is really quite small
(i.e., we're really just measuring the costs that `lazy_attribute` adds.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14615#comment:1>
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