[Numpy-discussion] Memory mapping and NPZ files

Mathieu Dubois mathieu.dubois at icm-institute.org
Sat Dec 12 13:53:50 EST 2015

Le 11/12/2015 11:22, Sturla Molden a écrit :
> Mathieu Dubois <mathieu.dubois at icm-institute.org> wrote:
>> The point is precisely that, you can't do memory mapping with Npz files
>> (while it works with Npy files).
> The operating system can memory map any file. But as npz-files are
> compressed, you will need to uncompress the contents in your memory mapping
> to make sense of it.
We agree on that. The goal is to be able to create a np.memmap array 
from an Npz file.

> I would suggest you use PyTables instead of npz-files.
> It allows on the fly compression and uncompression (via blosc) and will
> probably do what you want.
Yes I know I can use other solutions. The point is that np.load silently 
ignore the mmap option so I wanted to discuss ways to improve this.


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