[Numpy-discussion] numpy slices limited to 32 bit values?
Charles R Harris
Thu May 14 01:04:31 CDT 2009
On Wed, May 13, 2009 at 10:50 PM, Glenn Tarbox, PhD <email@example.com>wrote:
> I'm using the latest version of Sage (3.4.2) which is python 2.5 and numpy
> something or other (I will do more digging presently)
> I'm able to map large files and access all the elements unless I'm using
> so, for example:
> fp = np.memmap("/mnt/hdd/data/mmap/numpy1e10.mmap", dtype='float64',
> mode='r+', shape=(10000000000,))
> which is 1e10 doubles if you don't wanna count the zeros
> gives full access to a 75 GB memory image
> But when I do:
> fp[:] = 1.0
> I get 1410065408.0 as the result
As doubles, that is more than 2**33 bytes, so I expect there is something
else going on. How much physical memory/swap memory do you have? This could
also be a python problem since python does the memmap.
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