Same-moment A/B on a 64 MB f64 dataset: chunked+deflate 110 -> 69 ms, chunked
72 -> 60 ms, contiguous 56 -> 30 ms.
- read_chunked_data_cached — the path the facade uses — decompressed chunks
one at a time; only the uncached reader was parallel. Cache misses are now
decoded in bounded batches (128), in parallel with the `parallel` feature.
- Every chunk was pushed into the 16 MiB chunk cache, which a larger dataset
just churns (insert, evict moments later). Chunks are cached only when the
whole dataset fits (new ChunkCache::max_bytes).
- Unfiltered chunks went file -> Vec -> aligned cache buffer -> output. They
are copied straight from the file bytes.
- The facade's typed reads convert a contiguous dataset straight from the
borrowed file bytes instead of copying it into a Vec first.
- The native little-endian fast paths allocated vec![0; n] and then overwrote
it; they now fill an uninitialised buffer in one copy (native_le_to_vec).
alloc_output requests zeroed memory from the allocator instead of reserving
and filling.
The unit test that expected unfiltered chunks to land in the decompressed
cache now asserts the new design (index reused, cache not involved).
Co-Authored-By: Claude Fable 5.1 <[email protected]>
