After merging your PR, Conbench analyzed the 4 benchmarking runs that have been run so far on merge-commit 9b7875c.

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 2025-03-26 17:45:26Z
• Commit Run on amd64-m5-4xlarge-linux at 2025-03-26 18:28:37Z
• Commit Run on arm64-t4g-2xlarge-linux at 2025-03-26 19:08:41Z
• Commit Run on test-mac-arm at 2025-03-26 18:46:12Z

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 amd64-c6a-4xlarge-linux at 2025-03-26 17:45:26Z

  • MoveEmptyVector (C++) with params=<STATIC_VECTOR(std::string)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • ConstructFromEmptyStdVector (C++) with params=<STATIC_VECTOR(std::string)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • ShortVectorInsertAtEnd (C++) with params=<SMALL_VECTOR(int)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • ReverseSetBitRunReader (C++) with params=0, source=cpp-micro, suite=arrow-bit-util-benchmark
  • BinaryMathOpAdd128 (C++) with source=cpp-micro, suite=arrow-decimal-benchmark
  • ValidateTinyNonAscii (C++) with source=cpp-micro, suite=arrow-utf8-util-benchmark
  • ErrorSchemeExceptionNoInline (C++) with source=cpp-micro, suite=arrow-type-benchmark
  • CopyEmptyVector (C++) with params=<SMALL_VECTOR(std::shared_ptr)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • ShortVectorInsert (C++) with params=<STATIC_VECTOR(int)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • MoveEmptyVector (C++) with params=<STD_VECTOR(std::string)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • ConstructFromEmptyStdVector (C++) with params=<SMALL_VECTOR(int)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • ShortVectorInsertAtEnd (C++) with params=<STATIC_VECTOR(std::string)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • MoveShortVector (C++) with params=<STD_VECTOR(std::string)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • ConstructFromEmptyStdVector (C++) with params=<STD_VECTOR(std::string)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • BM_ByteStreamSplitEncode_Float_Scalar (C++) with params=1024, source=cpp-micro, suite=parquet-encoding-benchmark
  • CopyEmptyVector (C++) with params=<STD_VECTOR(int)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • HexParsing (C++) with params=, source=cpp-micro, suite=arrow-value-parsing-benchmark
  • ShortVectorInsertAtEnd (C++) with params=<STATIC_VECTOR(int)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • ExecuteScalarExpressionBaseline (C++) with params=/rows_per_batch:1000/real_time/threads:1, source=cpp-micro, suite=arrow-acero-expression-benchmark
  • CopyEmptyVector (C++) with params=<STATIC_VECTOR(std::string)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • ConstructFromEmptyStdVector (C++) with params=<STATIC_VECTOR(std::shared_ptr)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • ShortVectorPushBack (C++) with params=<SMALL_VECTOR(int)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • ExecuteScalarExpressionBaseline (C++) with params=/rows_per_batch:10000/real_time/threads:1, source=cpp-micro, suite=arrow-acero-expression-benchmark

• Commit Run on amd64-m5-4xlarge-linux at 2025-03-26 18:28:37Z

  • ReferenceNaiveBitmapWriter (C++) with params=8192, source=cpp-micro, suite=arrow-bit-util-benchmark

• Commit Run on arm64-t4g-2xlarge-linux at 2025-03-26 19:08:41Z

  • SetBitRunReader (C++) with params=60, source=cpp-micro, suite=arrow-bit-util-benchmark
  • BitRunReaderLinear (C++) with params=-1, source=cpp-micro, suite=arrow-bit-util-benchmark
  • TouchArea (C++) with params=size:4096/real_time/threads:16, source=cpp-micro, suite=arrow-memory-pool-benchmark