issues: 809366777

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
809366777 MDExOlB1bGxSZXF1ZXN0NTc0MjQxMTE3 4915 Better rolling reductions 2448579 closed 0     6 2021-02-16T14:37:49Z 2023-04-13T15:46:18Z 2021-02-19T19:44:04Z MEMBER   0 pydata/xarray/pulls/4915

Implements most of https://github.com/pydata/xarray/issues/4325#issuecomment-716399575 ``` python %load_ext memory_profiler

import numpy as np import xarray as xr

temp = xr.DataArray(np.zeros((5000, 500)), dims=("x", "y"))

roll = temp.rolling(x=10, y=20)

%memit roll.sum() %memit roll.reduce(np.sum) %memit roll.reduce(np.nansum) # master branch behaviour peak memory: 245.18 MiB, increment: 81.92 MiB peak memory: 226.09 MiB, increment: 62.69 MiB peak memory: 4493.82 MiB, increment: 4330.43 MiB `` - [x] xref #4325 - [x] asv benchmarks added - [x] Passespre-commit run --all-files- [x] User visible changes (including notable bug fixes) are documented inwhats-new.rst`

 
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