After merging your PR, Conbench analyzed the 5 benchmarking runs that have been run so far on merge-commit 787afa1.

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 2024-01-30 12:08:50Z
  • dataframe-to-table (Python) with dataset=type_dict
  • dataframe-to-table (Python) with dataset=type_strings

All benchmark runs analyzed:

• Commit Run on arm64-t4g-linux-compute at 2024-01-30 14:31:20Z
• Commit Run on ec2-m5-4xlarge-us-east-2 at 2024-01-30 12:40:50Z
• Commit Run on ursa-i9-9960x at 2024-01-30 12:08:50Z
• Commit Run on ec2-t3-xlarge-us-east-2 at 2024-01-30 12:16:15Z
• Commit Run on ursa-thinkcentre-m75q at 2024-01-30 14:23:49Z

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 2024-01-30 14:23:49Z
  • BM_ComputeHash (C++) with params=, source=cpp-micro, suite=parquet-bloom-filter-benchmark
  • ModeKernelNarrow (C++) with params=/1048576/0, source=cpp-micro, suite=arrow-acero-aggregate-benchmark
  • ModeKernelNarrow (C++) with params=/1048576/10000, source=cpp-micro, suite=arrow-acero-aggregate-benchmark
  • CopyShortVector (C++) with params=<SMALL_VECTOR(std::string)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • BM_DeltaBitPackingEncode_Int64_Wide (C++) with params=65536, source=cpp-micro, suite=parquet-encoding-benchmark