Excessive cpu usage for np.unique

Calling np.unique seems to result in > 100% cpu usage (no multiprocessing).

Reproducing code example:

import numpy as np

for _ in range(1000):
    arr = np.zeros((1024, 6144), dtype=np.uint16)
    np.unique(arr)

Error message:

htop shows ~3600% CPU usage.

Numpy/Python version information:

1.15.3 3.6.6 |Anaconda, Inc.| (default, Oct 9 2018, 12:34:16) [GCC 7.3.0]

[rgommers]

Rather than tagging an individual maintainer of Anaconda or Intel, it may be useful to open an issue on the correct tracker: https://github.com/ContinuumIO/anaconda-issues/issues. @njzjz it would be very helpful if you could do this and let us know so we can close this issue.

[mattip]

Closing the issue here, interested parties should follow the discussion on the open anaconda issue.