Herbert added the comment:
The exact error was:
ImportError: dynamic module does not define init function (PyInit_myextension)
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New submission from Herbert:
I think
PyObject *PyInit_myextention(void)
should be
PyMODINIT_FUNC PyInit_myextention(void)
on https://docs.python.org/3/howto/cporting.html#module-initialization-and-state
It didn't work for me until I replaced this with a message in the about
'undefined
Herbert added the comment:
It may be fair to note that I have no swap installed on one of the machines,
just 16GB of RAM, on which the 'crash' happens. Hence I'm not sure how this
affects paging, I would think there is no paging if there is no swap.
I can verify that the machine is 'stuck
Herbert added the comment:
Hi Eric,
I would assume that for the right range-parameter (in my case 30 * 1000 ** 2),
which just fits in memory, your system would also crash after a pickle.dump.
That is, I had this behavior on two of my machine both running a Ubuntu setup
though.
Nevertheless
Herbert added the comment:
That sound reasonable regarding why O(n), but it does not explain why linux
crashes (I've seen this on two ubuntu systems)if pickle runs out of memory.
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Changes by Herbert <python-b...@prinsherbert.nl>:
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type: -> performance
versions: +Python 3.4
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New submission from Herbert:
I very often want to use pickle to store huge objects, such that I do not need
to recalculate them again.
However, I noticed that pickle uses O(n) (for n the object size in memory)
amount of memory. That is, using python 3:
data = {'%06d' % i: i for i
