#11900: Serious regression caused by #9138
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Reporter: SimonKing | Owner:
tbd
Type: defect | Status:
needs_work
Priority: critical | Milestone:
sage-5.0
Component: performance | Keywords:
categories regression
Work_issues: Update reviewer patch | Upstream:
N/A
Reviewer: Jeroen Demeyer, Nicolas M. Thiéry, Simon King | Author:
Simon King
Merged: | Dependencies:
#9138 #11911 #9562
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Changes (by SimonKing):
* status: needs_review => needs_work
Comment:
I am now trying a different approach: I introduce a cdef class
`FastHashable_class`. It has a cdef int attribute _hash, and `__hash__`
simply returns `self._hash`. I make `Category_singleton` inherit from this
class and from `Category`. In the `__classcall__` method, I assign the
value of `_hash` appropriately.
First tests show that the hash method will be even faster than with the
current patch, and since it uses a straight forward `__hash__` method (not
a lazy class attribute) it is likely to work in Python 2.7.
Preparing a patch now...
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11900#comment:213>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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