⚡ Bolt: Zero-copy reading optimization #50
Conversation
- Add `TransferableDataStructure.SUPPORTS_SAB_VIEW` to detect if environment supports decoding SAB views directly. - Update `ShareableMap` and `ShareableArray` to skip intermediate buffer copy when reading if supported. - Fix `NumberEncoder` to respect `byteOffset` and `byteLength` of the input buffer, enabling correct `DataView` creation on views. Benchmarked improvement: - ShareableMap.get(): ~1.8x speedup - ShareableArray.at(): ~1.65x speedup
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💡 What: Implemented zero-copy reading for
ShareableMap.getandShareableArray.at(and internal reads).🎯 Why: Previously, reading an item involved copying the data from the
SharedArrayBufferto a temporaryUint8Arraybefore decoding, because historical browser support for decoding directly from SAB was inconsistent.📊 Impact: Reduces memory allocation and
memcpyoverhead. Benchmarks show ~1.8x speedup for Map reads and ~1.65x for Array reads.🔬 Measurement: Verified with a custom benchmark script measuring read operations on 1KB values.
npm testpassed to ensure correctness. CorrectedNumberEncoderto safely handle views with offsets.PR created automatically by Jules for task 1188094658173378037 started by @pverscha