After merging your PR, Conbench analyzed the 7 benchmarking runs that have been run so far on merge-commit 9f6dc1f.

Benchmarks with performance regressions

There were 7 possible performance regressions, according to the lookback z-score method.

Benchmarks with regressions:

• Commit Run on ursa-i9-9960x at 2024-03-13 23:17:43Z
  • file-read (Python) with compression=uncompressed, dataset=nyctaxi_2010-01, file_type=parquet, output_type=table
  • dataset-selectivity (Python) with dataset=nyctaxi_multi_ipc_s3, selectivity=1%
  • file-read (Python) with compression=lz4, dataset=nyctaxi_2010-01, file_type=feather, output_type=table
  • dataset-selectivity (Python) with dataset=nyctaxi_multi_parquet_s3, selectivity=100%
  • file-read (Python) with compression=uncompressed, dataset=nyctaxi_2010-01, file_type=parquet, output_type=dataframe
  • file-read (Python) with compression=uncompressed, dataset=nyctaxi_2010-01, file_type=feather, output_type=dataframe
  • file-read (Python) with compression=uncompressed, dataset=nyctaxi_2010-01, file_type=feather, output_type=table

All benchmark runs analyzed:

• Commit Run on ursa-thinkcentre-m75q at 2024-03-13 20:22:33Z
• Commit Run on test-mac-arm at 2024-03-13 23:10:51Z
• Commit Run on ec2-t3-xlarge-us-east-2 at 2024-03-13 15:14:30Z
• Commit Run on ursa-i9-9960x at 2024-03-13 23:17:43Z
• Commit Run on ec2-m5-4xlarge-us-east-2 at 2024-03-13 18:48:44Z
• Commit Run on arm64-t4g-linux-compute at 2024-03-13 21:42:17Z
• Commit Run on arm64-m6g-linux-compute at 2024-03-14 05:41:24Z

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 ursa-thinkcentre-m75q at 2024-03-13 20:22:33Z

  • DetectIntWidthNoNulls (C++) with source=cpp-micro, suite=arrow-int-util-benchmark

• Commit Run on arm64-t4g-linux-compute at 2024-03-13 21:42:17Z

  • BM_RleDecodingBoolean (C++) with params=65536, source=cpp-micro, suite=parquet-encoding-benchmark