#12808: Optimize ClassCallMetaClass using Cython
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Reporter: hivert | Owner: jason
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.0
Component: misc | Resolution:
Keywords: classcall UniqueRepresentation | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Florent Hivert | Merged in:
Dependencies: | Stopgaps:
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Old description:
> When a class {{{C}}} is an instance of {{{ClasscallMetaclass}}}, then for
> any constructor call, the system currently looks for {{{__classcall__}}}
> and {{{__classcall_private__}}} in {{{C}}}. This adds quite an overhead
> and this could be cached, assuming no one modifies {{{C}}} (which seems
> reasonable). Improving this speeds up, in particular, all call to the
> constructor of a subclass of {{{UniqueRepresentation}}}, eg. many
> parents, all categories...
New description:
When a class {{{C}}} is an instance of {{{ClasscallMetaclass}}}, then for
any constructor call, the system currently looks for {{{__classcall__}}}
and {{{__classcall_private__}}} in {{{C}}}. This adds quite an overhead
and this could be cached, assuming no one modifies {{{C}}} (which seems
reasonable). Improving this speeds up, in particular, all call to the
constructor of a subclass of {{{UniqueRepresentation}}}, eg. many parents,
all categories...
__Apply__
[attachment:trac_12808-classcall_speedup2.patch]
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Comment (by SimonKing):
I have created an alternative patch (using hg rename). It is smaller than
the original patch, but should result in identical code. So, either of the
patches could be used, but I guess the smaller patch is easier to read
(because one sees more easily the additional differences between
classcall_metaclass.py and classcall_metaclass.pyx)
Apply trac_12808-classcall_speedup2.patch
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12808#comment:14>
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