I can't reproduce it on my ssd, but might be timing related. Can you
trigger it when you run as
strace -s 1024 -ff -o tmpdir/log sage -tp2 tt*.py
If there is a temp file conflict then we can figure it out from the log...
On Saturday, December 28, 2013 11:33:59 PM UTC, Nils Bruin wrote:
>
> On Friday, December 27, 2013 10:16:06 AM UTC-8, Nils Bruin wrote:
>>
>> I'm finding that "sandpiles.py" often fails for me for varous reasons
>> while doing `make ptest`. Testing the file individually or via `sage -tp
>> src/sage/sandpiles` (i.e., just the relevant directory) seems fine.
>>
>
> It seems that the code involved in sandpiles explicitly uses the
> "singular" interface rather than libsingular, so I suspect it may be some
> IPC that goes wrong (the one error I am seeing seems the processing of a
> mismatched regular expression and for the time-out I am seeing the python
> and Singular processes just sitting there, not using any CPU). I have been
> able to trigger the error much more economically by extracting one of the
> doctests:
>
> $ cat ~/tt.py
> def tt():
> r"""
> The partitions of the vertices of ``S`` into ``k`` parts,
> each of which is connected.
>
> INPUT:
>
> ``S`` - Sandpile
> ``k`` - integer
>
> OUTPUT:
>
> list of partitions
>
> EXAMPLES::
>
> sage: S = Sandpile(graphs.CycleGraph(4), 0)
> sage: P = [admissible_partitions(S, i) for i in [2,3,4]]
> sage: P
> [[{{0}, {1, 2, 3}},
> {{0, 2, 3}, {1}},
> {{0, 1, 3}, {2}},
> {{0, 1, 2}, {3}},
> {{0, 1}, {2, 3}},
> {{0, 3}, {1, 2}}],
> [{{0}, {1}, {2, 3}},
> {{0}, {1, 2}, {3}},
> {{0, 3}, {1}, {2}},
> {{0, 1}, {2}, {3}}],
> [{{0}, {1}, {2}, {3}}]]
> sage: for p in P:
> ... sum([partition_sandpile(S, i).betti(verbose=False)[-1] for
> i in p])
> 6
> 8
> 3
> sage: S.betti()
> 0 1 2 3
> ------------------------------
> 0: 1 - - -
> 1: - 6 8 3
> ------------------------------
> total: 1 6 8 3
> """
> pass
> $ ln -s tt.py tt1.py # and similarly for tt2.py ... tt9.py
> $ sage -tp 2 tt*.py
>
> This doesn't trigger the errors with absolute certainty, but at least
> quite regularly (I guess I could up the number of symlinks to increase the
> probability of at least one failure). Can other people confirm similar
> failures? My homedir is NFS mounted on this machine, so if the singular
> interface decides to use temporary files to transmit information I can
> imagine something going wrong.
>
>
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