#13295: p_group_cohomology 2.1.3
----------------------------------------------------------------+-----------
Reporter: SimonKing |
Owner: tbd
Type: defect |
Status: needs_work
Priority: major |
Milestone: sage-5.4
Component: optional packages |
Resolution:
Keywords: group cohomology | Work
issues: Fix tests
Report Upstream: None of the above - read trac for reasoning. |
Reviewers:
Authors: Simon King | Merged
in:
Dependencies: database_gap-4.4.12.p1, #13123 |
Stopgaps:
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Comment (by SimonKing):
Here are some of the failures:
----
{{{
sage: (I*I).NF('std(0)').interred() #long time
Expected:
a_4_8*a_6_8*a_1_0^3*a_1_3
Got:
a_4_8*a_6_8*a_1_0^3*a_1_3,
a_4_8*a_6_8*c_8_16*a_1_0^3*a_1_3
}}}
That's serious, because it is a different result.
----
{{{
RuntimeError: Gap produced error output
Error, no 1st choice method found for `ReadLine' on 1 arguments
executing
makeThisSmallGroup([16,2],"/Users/SimonKing/.sage/pGroupCohomology/db/");
}}}
Indeed:
{{{
sage: from pGroupCohomology import CohomologyRing
sage: H = CohomologyRing(16,2,from_scratch=True, options='prot')
Computing from scratch
Group data are rooted at /Users/SimonKing/.sage/pGroupCohomology/db/
Initialize cohomology ring of SmallGroup(16,2)
Computing data for Small Group number 2 of order 16
Traceback (most recent call last):
...
RuntimeError: Gap produced error output
Error, no 1st choice method found for `ReadLine' on 1 arguments
executing
makeThisSmallGroup([16,2],"/Users/SimonKing/.sage/pGroupCohomology/db/");
}}}
----
{{{
pGroupCohomology.cochain.COCH.__init__:
sage -t -optional -long
"/Users/SimonKing/.sage/temp/bsd.math.washington.edu/39746/dir_0/file_6.py"
Error: saveUrbildGB: opening outfile.
}}}
{{{
pGroupCohomology.cochain.ChMap.__setitem__:
sage -t -optional -long
"/Users/SimonKing/.sage/temp/bsd.math.washington.edu/39746/dir_0/file_116.py"
Error: saveUrbildGB: opening outfile.
[2.3 s]
}}}
----
{{{
pGroupCohomology.factory.CohomologyRingFactory.set_web_db:
sage -t -optional -long
"/Users/SimonKing/.sage/temp/bsd.math.washington.edu/39746/dir_0/file_21.py"
**********************************************************************
File
"/Users/SimonKing/.sage/temp/bsd.math.washington.edu/39746/dir_0/file_21.py",
line 22:
sage: H=CohomologyRing.web_db('8gp3') # optional - internet
Exception raised:
Traceback (most recent call last):
...
IOError: [Errno 2] No such file or directory:
'/Users/SimonKing/.sage/pGroupCohomology/db/8gp3/dat/L8gp3n3d2.sobj'
}}}
----
Could it be that these are all I/O errors, except the first error? Perhaps
a race condition when running parallel tests (one test blocking file
access of other tests)?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13295#comment:14>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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