[Numpy-discussion] Numpy doesn't use RAM

Stanley Seibert sseibert at anaconda.com
Tue Mar 24 14:35:49 EDT 2020

In addition to what Sebastian said about memory fragmentation and OS limits
about memory allocations, I do think it will be hard to work with an array
that close to the memory limit in NumPy regardless.  Almost any operation
will need to make a temporary array and exceed your memory limit.  You
might want to look at Dask Array for a NumPy-like API for working with
chunked arrays that can be staged in and out of memory:


As a bonus, Dask will also let you make better use of the large number of
CPU cores that you likely have in your 1.9 TB RAM system.  :)

On Tue, Mar 24, 2020 at 1:00 PM Keyvis Damptey <quantkeyvis at gmail.com>

> Hi Numpy dev community,
> I'm keyvis, a statistical data scientist.
> I'm currently using numpy in python 3.8.2 64-bit for a clustering problem,
> on a machine with 1.9 TB RAM. When I try using np.zeros to create a 600,000
> by 600,000 matrix of dtype=np.float32 it says
> "Unable to allocate 1.31 TiB for an array with shape (600000, 600000) and
> data type float32"
> I used psutils to determine how much RAM python thinks it has access to
> and it return with 1.8 TB approx.
> Is there some way I can fix numpy to create these large arrays?
> Thanks for your time and consideration
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