[Debian-science-sagemath] Buster todo list

[François Bissey]

You may be interested in the discussion I had with other people at
https://trac.sagemath.org/ticket/26596#comment:21
and
https://github.com/cschwan/sage-on-gentoo/commit/1a5fefec74c222ee5d0673bb439c6d5a3b0c6e1e#commitcomment-30999803

My summary:
There is a subtle difference of behavior in xerblas as shipped by openblas (as a part of blas) and netlib's lapack function of the same name (shipped as part of lapack). If you ship an integrated openblas with lapack included you get the base blas function from openblas (that's the one vanilla sage sees). If you have a separate lapack based on netlib you get to load netlib's xerblas first. You may find that if you preload openblas first the problem may go away.

> On 23/01/2019, at 18:34, Ximin Luo <infinity0 at debian.org> wrote:
> 
>> 
>> https://wiki.debian.org/DebianScience/Sage#Buster_roadmap
>> 
> 
>> Fix sage/matrix/matrix_double_dense.pyx  # Testing error: no result when testing in parallel. (This causes tests to be rerun.) 
> 
> The situation is actually worse than this. If you look through the test logs, you can see that we are "Only doctesting files that failed last test", however if you grep for "matrix_double_dense" after this line you'll see that it doesn't appear and is ignored totally, and does not actually succeed.
> 
> Locally, I cannot reproduce either a success *or* having the doctesting framework ignore the matrix_double_dense when I give -f, all combinations of:
> 
> $ ./sage -t --long src/sage/matrix/matrix_double_dense.pyx
> $ ./sage -t -p --long src/sage/matrix/matrix_double_dense.pyx
> $ ./sage -t -p 1 --long src/sage/matrix/matrix_double_dense.pyx
> $ ./sage -t -f --long src/sage/matrix/matrix_double_dense.pyx
> $ ./sage -t -f -p --long src/sage/matrix/matrix_double_dense.pyx
> $ ./sage -t -f -p 1 --long src/sage/matrix/matrix_double_dense.pyx
> 
> all result in:
> 
> [..]
> Doctesting 1 file.
> sage -t --long src/sage/matrix/matrix_double_dense.pyx
>    Error in doctesting framework (no result returned)
> [..]
> sage: P.is_unitary(algorithm='orthonormal') ## line 2520 ##
> ** On entry to ZGEES  parameter number  6 had an illegal value
> 
> **********************************************************************
> ----------------------------------------------------------------------
> sage -t --long src/sage/matrix/matrix_double_dense.pyx  # Testing error: no result
> ----------------------------------------------------------------------
> 
> X
> 
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