After merging your PR, Conbench analyzed the 4 benchmarking runs that have been run so far on merge-commit e7f5b6f.

Benchmarks with performance regressions

There were 0 possible performance regressions, according to the lookback z-score method.

All benchmark runs analyzed:

• Commit Run on amd64-c6a-4xlarge-linux at 2025-07-11 03:36:52Z
• Commit Run on arm64-t4g-2xlarge-linux at 2025-07-11 06:01:59Z
• Commit Run on amd64-m5-4xlarge-linux at 2025-07-11 03:54:05Z
• Commit Run on test-mac-arm at 2025-07-11 10:57:37Z

Unstable benchmarks with performance regressions

The following benchmark results indicate a possible performance regression, but are known to sometimes produce false positives when applying the lookback z-score analysis.

• Commit Run on arm64-t4g-2xlarge-linux at 2025-07-11 06:01:59Z

  • CheckIndexBoundsUInt32 (C++) with params=1048576/0, source=cpp-micro, suite=arrow-int-util-benchmark
  • CheckIndexBoundsInt32 (C++) with params=1048576/1, source=cpp-micro, suite=arrow-int-util-benchmark
  • LongVectorInsertAtEnd (C++) with params=<STD_VECTOR(int)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • LongVectorInsertAtEnd (C++) with params=<SMALL_VECTOR(int)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • CopyShortVector (C++) with params=<STATIC_VECTOR(std::string)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • ConstructFromShortStdVector (C++) with params=<SMALL_VECTOR(int)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • CopyShortVector (C++) with params=<STD_VECTOR(int)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • CheckIndexBoundsUInt32 (C++) with params=65536/0, source=cpp-micro, suite=arrow-int-util-benchmark
  • CheckIndexBoundsUInt32 (C++) with params=65536/1000, source=cpp-micro, suite=arrow-int-util-benchmark
  • MoveEmptyVector (C++) with params=<STD_VECTOR(int)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • ShortVectorInsert (C++) with params=<SMALL_VECTOR(int)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • CheckIndexBoundsUInt32 (C++) with params=65536/1, source=cpp-micro, suite=arrow-int-util-benchmark
  • CheckIndexBoundsInt32 (C++) with params=65536/2, source=cpp-micro, suite=arrow-int-util-benchmark
  • ConstructFromShortStdVector (C++) with params=<STD_VECTOR(std::string)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • ConstructFromEmptyStdVector (C++) with params=<STATIC_VECTOR(int)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • ShortVectorPushBack (C++) with params=<STATIC_VECTOR(std::string)>, source=cpp-micro, suite=arrow-small-vector-benchmark

• Commit Run on amd64-m5-4xlarge-linux at 2025-07-11 03:54:05Z

  • BitRunReaderLinear (C++) with params=0, source=cpp-micro, suite=arrow-bit-util-benchmark