[Numpy-discussion] NumPy nogil API

mark florisson markflorisson88@gmail....
Mon Oct 31 03:44:41 CDT 2011

On 30 October 2011 21:01, Pauli Virtanen <pav@iki.fi> wrote:
> 30.10.2011 21:48, mark florisson kirjoitti:
>> First, I'd like to report a bug. It seems ndarray does not implement
>> tp_traverse or tp_clear, so if you have a reference cycle in an
>> ndarray with dtype object none of those objects will ever be
>> collected.
> Indeed, this is missing. http://projects.scipy.org/numpy/ticket/1003
> If I recall correctly, there was something painful in implementing this
> for Numpy arrays, though...
>> Secondly, please bear with me, I'm not a NumPy expert, but would it be
>> possible to have NumPy export an API that can be called without the
>> GIL? In the upcoming Cython release 0.16 (soon to be released) we will
>> have what is called typed memoryviews [1], which allow you to obtain a
>> typed view on any PEP 3118 buffer, and it allows you to do a lot more
>> things without the GIL. e.g. it allows you to pass these views around,
>> transpose them, slice them (in the same way as in NumPy but slightly
>> more restricted, it doesn't support masks and such), index them etc
>> without the GIL.
> The closest thing to making this to happen is the work made on porting
> Numpy to IronPython. Basically, a major part of that involved ripping
> the innards of Numpy out to a more reusable C library. It's been in a
> merge-limbo for some time now, however.

Ah, that's too bad. Is it anywhere near ready, or was it abandoned for
ironclad? Could you point me to the code?

> --
> Pauli Virtanen
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