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Add xarray reduction from dask#10384 #1020

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Sep 27, 2023
Merged

Add xarray reduction from dask#10384 #1020

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28 changes: 28 additions & 0 deletions tests/benchmarks/test_array.py
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Original file line number Diff line number Diff line change
Expand Up @@ -282,3 +282,31 @@ def test_rechunk_out_of_memory(small_client, configure_rechunking):
rng = da.random.default_rng()
x = rng.random((100000, 100000))
x.rechunk((50000, 20)).rechunk((20, 50000)).sum().compute()


@run_up_to_nthreads("small_cluster", 50, reason="fixed dataset")
@pytest.mark.parametrize("backend", ["dataframe", "array"])
def test_xarray_reduction(small_client, backend):
# See https://github.com/dask/dask/issues/10384
xr = pytest.importorskip("xarray")
size = 4000
ds = xr.Dataset(
dict(
anom_u=(
["time", "face", "j", "i"],
da.random.random((size, 1, 987, 1920), chunks=(10, 1, -1, -1)),
),
anom_v=(
["time", "face", "j", "i"],
da.random.random((size, 1, 987, 1920), chunks=(10, 1, -1, -1)),
),
)
)

quad = ds**2
quad["uv"] = ds.anom_u * ds.anom_v
mean = quad.mean("time")
if backend == "dataframe":
mean = mean.to_dask_dataframe()

wait(mean, small_client, 10 * 60)