After merging your PR, Conbench analyzed the 4 benchmarking runs that have been run so far on merge-commit 0a12d05.

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 03:04:26Z
• Commit Run on arm64-t4g-2xlarge-linux at 2025-07-11 06:02:27Z
• Commit Run on amd64-m5-4xlarge-linux at 2025-07-11 03:38:16Z
• Commit Run on test-mac-arm at 2025-07-11 08:41:13Z

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 2025-07-11 03:04:26Z

  • ListSliceStringListWithStop (C++) with params=32768/1, source=cpp-micro, suite=arrow-compute-scalar-list-benchmark
  • AllocateTouchDeallocate (C++) with params=/size:1048576/real_time/threads:8, source=cpp-micro, suite=arrow-memory-pool-benchmark

• Commit Run on arm64-t4g-2xlarge-linux at 2025-07-11 06:02:27Z

  • BM_PlainDecodingFloat (C++) with params=4096, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_PlainDecodingBoolean (C++) with params=4096, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_WriteBinaryColumn (C++) with params=null_probability:50/unique_values:32, source=cpp-micro, suite=parquet-arrow-reader-writer-benchmark
  • BM_PlainDecodingSpacedBoolean (C++) with params=32768/10000, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_PlainDecodingBoolean (C++) with params=32768, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_PlainEncodingSpacedBoolean (C++) with params=32768/1000, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_ByteStreamSplitEncode_FLBA_Generic (C++) with params=<7>/1024, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_WriteBinaryColumn (C++) with params=null_probability:1/unique_values:32, source=cpp-micro, suite=parquet-arrow-reader-writer-benchmark
  • BM_PlainDecodingSpacedFloat (C++) with params=32768/10000, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_ByteStreamSplitEncode_FLBA_Generic (C++) with params=<7>/65536, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_PlainEncodingBoolean (C++) with params=4096, source=cpp-micro, suite=parquet-encoding-benchmark