Why does numpy.memmap.flush() not update file in Windows?

Asked May 05 '19 at 14:37

Active May 05 '19 at 14:37

Viewed 298 times

I am currently copying/reformatting data from disk into a memmapped-numpy array. I call flush() every ~5000 elements, but the change-date in Windows does not change.

dimx = 400000
dimy = 100
dimz = 16
data_in: np.memmap = np.memmap(fname_input, dtype='float32', mode='r+', shape=(dimx, dimy, dimz))
for i in range(dimx):
    data = next(data_generator)
    data_in[i] = data

    if (i % 5000) is 0 and i is not 0:
        data_in.flush()
        print('changes flushed to disk.')

asked May 05 '19 at 14:37

I4k

Apparently this is a Windows-thing. – I4k May 06 '19 at 11:50
The file is actually updated but Windows does not reflect that – I4k May 06 '19 at 11:50

Why does numpy.memmap.flush() not update file in Windows?

0 Answers0