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Use bulk writes instead of per-element writes in vector serialization#681

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bulk-writes-memorySegment
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Use bulk writes instead of per-element writes in vector serialization#681
r-devulap wants to merge 1 commit into
mainfrom
bulk-writes-memorySegment

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@r-devulap

@r-devulap r-devulap commented Jun 17, 2026

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Replace inefficient element-by-element write loops with bulk write operations in MemorySegmentVectorProvider:

  • writeFloatVector: Extract underlying float array and use writeFloats() instead of looping with writeFloat()
  • writeByteSequence: Extract underlying byte array and use write() instead of looping with writeByte()

With highway as the SIMD backend #668 , the scalar writes show up as a bottleneck when constructing index on a AWS instance x8i.24xlarge (2-socket 96 core Intel GNR) .

Dataset Index Build Time Before (s) Index Build Time After (s)
openai-1536-1m 105.59 45.22
openai-3072-1m 164.63 102.75

Replace inefficient element-by-element write loops with bulk write
operations in MemorySegmentVectorProvider:

- writeFloatVector: Extract underlying float array and use writeFloats()
  instead of looping with writeFloat()
- writeByteSequence: Extract underlying byte array and use write()
  instead of looping with writeByte()
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github-actions Bot commented Jun 17, 2026

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