- README's "HDF5 Core I/O" table claimed 19ns/2,080µs labeled 308× (real ratio
~109,000×) and a 313ns zero-copy mmap figure — neither traced to any dated
benchmark in BENCHMARKS.md. Replaced the table wholesale with the existing
"vs libhdf5 Summary" figures, relabeled from "h5py/C HDF5" to "libhdf5"
(BENCHMARKS.md never benchmarks against h5py, only libhdf5 directly).
- Added two new Criterion benchmarks to close the coverage gaps that produced
the untraceable numbers: metadata_open_from_disk (I/O-inclusive, fair
clawhdf5-vs-libhdf5 file-open comparison) and metadata_parse_in_memory
(clawhdf5-only, explicitly labeled as excluding I/O) in h5bench_meta.rs;
read_zerocopy_mmap in h5bench_read.rs (forces real page-ins by summing
elements rather than just returning a slice length — the mmap path turns
out to be slower than a plain copy at these sizes, an honest, unflattering
but real result now documented instead of a fabricated 313ns).
- Re-ran the full existing benchmark suite plus the two new ones on a second,
independently administered machine (tank: Ryzen 7 7800X3D) to validate the
numbers before publishing them. 5 of 6 rows landed within ~15% of the
original i7-12650H figures; recorded both in BENCHMARKS.md's new
"Independent Validation" section. README now cites the tank numbers.
- Added a short top-of-file README callout naming both halves of the project
(general-purpose HDF5 library vs. agent memory layer) with links to
BENCHMARKS.md and the Crate Map, so a data-infra reader isn't 60% through
a memory-store pitch before finding the part relevant to them.
- Added one factual, no-names line noting benchmark numbers are being
validated in collaboration with HDF5 Group engineers.
- Fixed the same untraceable "2-300x faster than h5py/C HDF5" / "313 ns"
claims in docs/QUICKSTART.md, one click from the README's own "New here?"
link.
Co-Authored-By: Claude Sonnet 5 <[email protected]>
Adds three Criterion benchmark suites mirroring the h5bench HPC I/O
benchmark workloads in pure Rust — no C libhdf5 required for the default
path, with an optional `libhdf5-compare` feature for side-by-side numbers.
- benches/h5bench_write.rs: write_1d_contiguous, write_2d_chunked,
write_f64_batch, write_multi_dataset, write_with_attrs
- benches/h5bench_read.rs: read_sequential, read_f64_sequential,
read_chunked_2d, read_from_disk, read_hyperslab
- benches/h5bench_meta.rs: metadata_attrs_write, metadata_attrs_read,
metadata_groups_create, metadata_groups_traverse, metadata_string_attrs
All benchmarks pass `cargo bench --bench <name> -- --test` and clippy
reports zero warnings. Run with `cargo bench -p clawhdf5-bench`.
Co-Authored-By: Claude Sonnet 4.6 <[email protected]>
