#15104: Special case modn_dense matrix operations to improve performance
-------------------------------------+-------------------------------------
Reporter: nbruin | Owner:
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.2
Component: linear algebra | Resolution:
Keywords: | Merged in:
Authors: Nils Bruin, Simon | Reviewers:
King | Work issues: regression in
Report Upstream: N/A | right_kernel_matrix
Branch: | Commit:
u/SimonKing/ticket/15104 | 0f008f9266e3ed6fbd67e7f3d357474825bdb160
Dependencies: | Stopgaps:
-------------------------------------+-------------------------------------
Comment (by SimonKing):
The difference seems to be the category initialisation of the matrix
space:
{{{
sage: M=matrix(GF(5),6,6,range(36))
sage: MS = M.parent()
sage: %timeit M.right_kernel_matrix(basis='computed')
1000 loops, best of 3: 377 us per loop
sage: MS.full_category_initialisation()
sage: %timeit M.right_kernel_matrix(basis='computed')
10000 loops, best of 3: 190 us per loop
}}}
There is a reason why the category of a matrix space is not fully
initialised by default. So, making category initialisation the new default
would be bad, IMHO.
First, we should try to understand why apparently the
`right_kernel_matrix` operation in the master branch do cache the
category, while the ticket branch doesn't.
Then we should identify some operations that ''should'' trigger a full
category initialisation.
In principle, creating a strong cache for vector space categories would
fix the regression; in a new sage session:
{{{
sage: M=matrix(GF(5),6,6,range(36))
sage: C = VectorSpaces(GF(5))
sage: %timeit M.right_kernel_matrix(basis='computed')
10000 loops, best of 3: 186 us per loop
}}}
But this would be prone to create memory leaks that we have previously
been fixing.
--
Ticket URL: <http://trac.sagemath.org/ticket/15104#comment:27>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac.
For more options, visit https://groups.google.com/groups/opt_out.
