After merging your PR, Conbench analyzed the 4 benchmarking runs that have been run so far on merge-commit 9ee6ea7.

Benchmarks with performance regressions

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

All benchmark runs analyzed:

• Commit Run on arm64-t4g-linux-compute at 2024-06-05 22:34:02Z
• Commit Run on ec2-m5-4xlarge-us-east-2 at 2024-06-05 21:05:50Z
• Commit Run on arm64-m6g-linux-compute at 2024-06-05 21:13:00Z
• Commit Run on test-mac-arm at 2024-06-06 01:03:46Z

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-linux-compute at 2024-06-05 22:34:02Z

  • BitRunReaderLinear (C++) with params=-1, source=cpp-micro, suite=arrow-bit-util-benchmark
  • GenerateBits (C++) with params=8192, source=cpp-micro, suite=arrow-bit-util-benchmark
  • ThreadPoolSpawn (C++) with params=threads:1/task_cost:100000/real_time, source=cpp-micro, suite=arrow-thread-pool-benchmark
  • ThreadPoolSpawn (C++) with params=threads:2/task_cost:100000/real_time, source=cpp-micro, suite=arrow-thread-pool-benchmark
  • ThreadPoolSpawn (C++) with params=threads:1/task_cost:10000/real_time, source=cpp-micro, suite=arrow-thread-pool-benchmark
  • ValidateTinyAscii (C++) with source=cpp-micro, suite=arrow-utf8-util-benchmark
  • ErrorSchemeResult (C++) with source=cpp-micro, suite=arrow-type-benchmark

• Commit Run on test-mac-arm at 2024-06-06 01:03:46Z

  • BM_DeltaDecodingByteArray (C++) with params=max-string-length:8/batch-size:512/prefixed-percent:90, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_RleDecodingBoolean (C++) with params=4096, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_RleEncodingBoolean (C++) with params=32768, source=cpp-micro, suite=parquet-encoding-benchmark
  • RoundArrayBenchmark (C++) with params=<Round, Int32Type, RoundMode::HALF_TOWARDS_ZERO>/size:4194304/inverse_null_proportion:0, source=cpp-micro, suite=arrow-compute-scalar-round-benchmark