After merging your PR, Conbench analyzed the 6 benchmarking runs that have been run so far on merge-commit b668595.

Benchmarks with performance regressions

There were 2 possible performance regressions, according to the lookback z-score method.

Benchmarks with regressions:

• Commit Run on ursa-i9-9960x at 2023-08-12 07:55:52Z
  • file-read (R) with compression=uncompressed, dataset=fanniemae_2016Q4, file_type=feather, language=R, output_type=dataframe
  • file-read (R) with compression=lz4, dataset=fanniemae_2016Q4, file_type=feather, language=R, output_type=table

All benchmark runs analyzed:

• Commit Run on arm64-m6g-linux-compute at 2023-08-10 01:15:39Z
• Commit Run on ursa-thinkcentre-m75q at 2023-08-10 19:49:38Z
• Commit Run on ursa-i9-9960x at 2023-08-12 07:55:52Z
• Commit Run on ec2-m5-4xlarge-us-east-2 at 2023-08-09 07:45:12Z
• Commit Run on ec2-t3-xlarge-us-east-2 at 2023-08-09 05:24:21Z
• Commit Run on arm64-t4g-linux-compute at 2023-08-09 08:28:39Z

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-m6g-linux-compute at 2023-08-10 01:15:39Z

  • SelectKInt64 (C++) with params=65536/0/min_time:1.000, source=cpp-micro, suite=arrow-compute-vector-topk-benchmark

• Commit Run on ursa-thinkcentre-m75q at 2023-08-10 19:49:38Z

  • ExecuteScalarExpressionBaseline (C++) with params=/rows_per_batch:10000/real_time/threads:1, source=cpp-micro, suite=arrow-acero-expression-benchmark
  • ExecuteScalarExpressionBaseline (C++) with params=/rows_per_batch:100000/real_time/threads:1, source=cpp-micro, suite=arrow-acero-expression-benchmark