#9760: Possible numerical noise doctest failure in sage/matrix/matrix2.pyx on t2
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Reporter: mpatel | Owner: drkirkby
Type: defect | Status: new
Priority: blocker | Milestone: sage-4.5.3
Component: solaris | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by drkirkby):
I expect ATLAS would be used for this test, but has that been 100%
confirmed?
It's very puzzling. I guess its possible that ATLAS may give slightly
different results if it's tuned differently.
I suspect John built this with the ATLAS changes at #9508. Since he
normally used a version of ATLAS he built before to save time, I suspect
he tuned ATLAS this time.
John reported on #9508 that the ATLAS changes has been tested on t2. Does
this mean the doctests passed for John once, but failed on a second build?
I can power up my SPARC tomorrow and see if I can reproduce this. Since my
processors are reconised by ATLAS, it does not go through the lenghty
tuning process needed on 't2', and so the tuning parameters will not
change from one build to another.
Can John try removing ATLAS, then using his old ATLAS file (or they are in
/ATLAS on t2).
It's possible that the additional shared libraries from #9508 mean
something in Sage that previously linked with a static library, would now
link with a shared one.
I suspect slight differences in tuning parameters might be the cause
though. Does the criteria need to be changed by a factor of 10 to get
htis to pass, or would a maller change be acceptable,
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9760#comment:1>
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