After merging your PR, Conbench analyzed the 4 benchmarking runs that have been run so far on merge-commit c2123b8.

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 2024-09-05 17:30:50Z
• Commit Run on arm64-t4g-2xlarge-linux at 2024-09-05 18:47:12Z
• Commit Run on test-mac-arm at 2024-09-05 19:53:10Z
• Commit Run on amd64-m5-4xlarge-linux at 2024-09-05 19:54:43Z

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 2024-09-05 17:30:50Z

  • ArrayDataConstructDestruct (C++) with source=cpp-micro, suite=arrow-builder-benchmark
  • BuildDecimalArray (C++) with source=cpp-micro, suite=arrow-builder-benchmark
  • BuildChunkedBinaryArray (C++) with source=cpp-micro, suite=arrow-builder-benchmark

• Commit Run on test-mac-arm at 2024-09-05 19:53:10Z

  • BM_ArrowBinaryDict (C++) with params=EncodeDictDirectInt32/1048576, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_ArrowBinaryDict (C++) with params=EncodeDictDirectInt8/1048576, source=cpp-micro, suite=parquet-encoding-benchmark
  • ArrayScalarKernel (C++) with params=<AddChecked, Int8Type>/size:4194304/inverse_null_proportion:0, source=cpp-micro, suite=arrow-compute-scalar-arithmetic-benchmark
  • BM_ArrowBinaryDict (C++) with params=EncodeDictDirectInt16/1048576, source=cpp-micro, suite=parquet-encoding-benchmark

• Commit Run on amd64-m5-4xlarge-linux at 2024-09-05 19:54:43Z

  • BM_DecodeArrowBooleanRle (C++) with params=DecodeArrowWithNull/num_values:16384/null_in_ten_thousand:1000, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_PlainEncodingSpacedBoolean (C++) with params=32768/10000, source=cpp-micro, suite=parquet-encoding-benchmark