After merging your PR, Conbench analyzed the 6 benchmarking runs that have been run so far on merge-commit 6357c9f.

Benchmarks with performance regressions

There were 4 possible performance regressions, according to the lookback z-score method.

Benchmarks with regressions:

• Commit Run on ursa-i9-9960x at 2023-08-20 21:29:36Z
  • file-read (R) with compression=uncompressed, dataset=fanniemae_2016Q4, file_type=feather, language=R, output_type=dataframe
  • file-read (Python) with compression=uncompressed, dataset=fanniemae_2016Q4, file_type=feather, output_type=table
  • file-read (Python) with compression=uncompressed, dataset=fanniemae_2016Q4, file_type=feather, output_type=dataframe
  • tpch (R) with engine=arrow, format=parquet, language=R, memory_map=False, query_id=TPCH-04, scale_factor=1

All benchmark runs analyzed:

• Commit Run on arm64-m6g-linux-compute at 2023-08-20 22:39:33Z
• Commit Run on ursa-i9-9960x at 2023-08-20 21:29:36Z
• Commit Run on ec2-t3-xlarge-us-east-2 at 2023-08-20 21:44:01Z
• Commit Run on arm64-t4g-linux-compute at 2023-08-20 22:43:57Z
• Commit Run on ursa-thinkcentre-m75q at 2023-08-20 22:38:42Z
• Commit Run on ec2-m5-4xlarge-us-east-2 at 2023-08-20 21:47:16Z

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 2023-08-20 22:39:33Z

  • BM_DefinitionLevelsToBitmapRepeatedAllMissing (C++) with source=cpp-micro, suite=parquet-level-conversion-benchmark

• Commit Run on ursa-thinkcentre-m75q at 2023-08-20 22:38:42Z

  • ArrayArrayKernel (C++) with params=<Add, UInt16Type>/size:524288/inverse_null_proportion:0, source=cpp-micro, suite=arrow-compute-scalar-arithmetic-benchmark