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Using GPUs with Zarr

Zarr can use GPUs to accelerate your workload by running zarr.Config.enable_gpu.

!!! note zarr-python currently supports reading the ndarray data into device (GPU) memory as the final stage of the codec pipeline. Data will still be read into or copied to host (CPU) memory for encoding and decoding.

In the future, codecs will be available compressing and decompressing data on
the GPU, avoiding the need to move data between the host and device for
compression and decompression.

Reading data into device memory

[zarr.config][] configures Zarr to use GPU memory for the data buffers used internally by Zarr via enable_gpu().

import zarr
import cupy as cp
zarr.config.enable_gpu()
z = zarr.create_array(
    store="memory://gpu-demo", shape=(100, 100), chunks=(10, 10), dtype="float32",
)
type(z[:10, :10])
# cupy.ndarray

Note that the output type is a cupy.ndarray rather than a NumPy array.