#13880: Respect ulimit -v for GAP memory pool size
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Reporter: vbraun | Owner: jason
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.6
Component: misc | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Volker Braun | Merged in:
Dependencies: | Stopgaps:
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Comment (by leif):
Replying to [comment:4 vbraun]:
> Replying to [comment:3 leif]:
> > Why `available_swap() in ZZ`?
>
> To test that it returns an integer as promised in the docstring.
Not that obvious, to me at least... ;-)
Still wonder whether we shouldn't also test that the result is actually
non-negative.
[[BR]]
> I've added a manual 2GB limit for the rare case of 32-bit machines with
>> 2GB ram.
Ok. (The more common case -- which I meant -- is having >> 2 GB ''swap
space'', which is handled now as well.)
[[BR]]
Slightly related (`memory_info.py` probably deserved its own ticket):
`available_ram()` should probably have an optional boolean parameter to
not just return the amount of ''free'' memory ("`MemFree`"), as this can
often be pretty close to zero, due to buffering and especially caching.
(I.e., the amount of "available" RAM, allocatable by a process without
running out of [physical] memory, might in fact be much larger, regardless
of whether swap space is available or not.)
As is, although its docstring contains "free" in parentheses, the term
"available RAM" is IMHO potentially misleading.
W.r.t. GAP, I think it may currently "run out of memory" simply because
[there's no or not enough swap space ''and''] most (or at least much) of
the physical memory is eaten up by just caches.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13880#comment:5>
Sage <http://www.sagemath.org>
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