#14150 closed defect (fixed)
Fix wait() in @parallel
Reported by: | jdemeyer | Owned by: | jason |
---|---|---|---|
Priority: | major | Milestone: | sage-5.8 |
Component: | misc | Keywords: | |
Cc: | Merged in: | sage-5.8.beta2 | |
Authors: | Jeroen Demeyer | Reviewers: | David Roe |
Report Upstream: | N/A | Work issues: | |
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description
The new doctesting framework sometimes gets:
sage -t --long devel/sage/sage/homology/simplicial_complex.py ********************************************************************** File "devel/sage/sage/homology/simplicial_complex.py", line 2188, in sage.homology.simplicial_complex.SimplicialComplex.is_cohen_macaulay Failed example: S.is_cohen_macaulay(ncpus=3) Expected: False Got: Exception OSError: (10, 'No child processes') in <generator object __call__ at 0x646f1e0> ignored False **********************************************************************
Fix this.
Attachments (1)
Change History (13)
comment:1 Changed 8 years ago by
- Status changed from new to needs_review
comment:2 follow-up: ↓ 3 Changed 8 years ago by
comment:3 in reply to: ↑ 2 Changed 8 years ago by
Replying to roed:
is there one that consistently fails in the new framework?
To be honest, I cannot say for sure why the problem occurs.
I'm fairly certain the problem is the big gap between
pid = os.wait()[0]
and
del workers[pid]
If some exception would occur in between, then workers[pid]
would still be in the list of workers, even though we saw it exit. However, I cannot really explain where the exception could come from (can yield
raise exceptions?)
comment:4 follow-up: ↓ 5 Changed 8 years ago by
How consistently is this error occurring in the new framework? Every time? Do the fixes here make the problem disappear? If so, I'm willing to give this a positive review, since there is a doctest failing that will no longer fail.
comment:5 in reply to: ↑ 4 Changed 8 years ago by
Replying to roed:
How consistently is this error occurring in the new framework? Every time?
Not every time, but it's still reasonably common that I have seen it multiple times.
comment:6 Changed 8 years ago by
Added doctest which always shows the OSError
without this patch.
comment:7 Changed 8 years ago by
- Reviewers set to David Roe
- Status changed from needs_review to needs_work
You should fix the unpickling after breaking it. Add
sage: from sage.structure.sage_object import unpickle_override sage: del unpickle_override[('sage.rings.polynomial.polynomial_rational_flint', 'Polynomial_rational_flint')]
after the end of the TESTS
block. Otherwise it looks good.
comment:8 Changed 8 years ago by
Good point :-)
Changed 8 years ago by
comment:9 Changed 8 years ago by
- Status changed from needs_work to needs_review
comment:11 Changed 8 years ago by
- Merged in set to sage-5.8.beta2
- Resolution set to fixed
- Status changed from positive_review to closed
comment:12 Changed 8 years ago by
Possibly related: #15585
Looks good. You didn't add a doctest: is there one that consistently fails in the new framework?