#11900: Serious regression caused by #9138
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Reporter: SimonKing | Owner: tbd
Type: defect | Status: new
Priority: blocker | Milestone: sage-4.7.2
Component: performance | Keywords: categories regression
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Comment(by SimonKing):
Next finding: It could be that the cache for matrix spaces is broken. I
inserted a print statement into the initialisation of
`MatrixSpace_generic` that shows base_ring,nrows,ncols and the sparsity.
By the cache implemented in the `MatrixSpace` constructor, no quadrupel
should occur twice, but in fact the space of dense 8 by 8 matrices over
`GF(46337)` and other instances occurs several times. Could it be that the
matrix space is ''directly'' constructed, i.e., breaking the cache?
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11900#comment:5>
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