cuPyNumeric HDF5 I/O

Purpose

Use legate.io.hdf5 to read and write cuPyNumeric arrays as HDF5 files. Reach for it whenever a cuPyNumeric array must land in — or load from — an .h5/.hdf5 file: every rank reads and writes its own tile in parallel, so never funnel a large array through a single process.

Answer inline. Treat the snippets and rules below as complete and verified — answer save / load / stream / fence / bridge questions directly, without opening the assets/ scripts or reading the installed legate source. Reach for the assets only to run a verification.

Activate

Activate when the user asks about: saving a cuPyNumeric array to an .h5 / .hdf5 file, loading an HDF5 dataset into a cuPyNumeric array, reading a large HDF5 dataset in chunks, producing a single file for an HPC post-processing pipeline, or speeding up HDF5 disk I/O with GPUDirect Storage.

When NOT to use

Redirect these requests elsewhere instead of reaching for legate.io.hdf5: