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Add sharding to multiprocessing test #3475

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Merged
merged 3 commits into from
Sep 19, 2025
Merged

Add sharding to multiprocessing test #3475

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6d96ad7
add sharding to multiprocessing test
ziw-liu Jul 10, 2025
2351e57
Merge branch 'main' into shards-multiprocessing
d-v-b Sep 19, 2025
595c52c
Update tests/test_array.py
d-v-b Sep 19, 2025
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11 changes: 9 additions & 2 deletions tests/test_array.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1789,12 +1789,19 @@ def _index_array(arr: Array, index: Any) -> Any:
],
)
@pytest.mark.parametrize("store", ["local"], indirect=True)
def test_multiprocessing(store: Store, method: Literal["fork", "spawn", "forkserver"]) -> None:
@pytest.mark.parametrize("shards", [None, (20,)])
def test_multiprocessing(
store: Store, method: Literal["fork", "spawn", "forkserver"], shards: tuple[int, ...] | None
) -> None:
"""
Test that arrays can be pickled and indexed in child processes
"""
data = np.arange(100)
arr = zarr.create_array(store=store, data=data)
if shards is None:
chunks = "auto"
else:
chunks = (1,)
arr = zarr.create_array(store=store, data=data, shards=shards, chunks=chunks)
ctx = mp.get_context(method)
with ctx.Pool() as pool:
results = pool.starmap(_index_array, [(arr, slice(len(data)))])
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