After merging your PR, Conbench analyzed the 7 benchmarking runs that have been run so far on merge-commit 6a9e2d5.

Benchmarks with performance regressions

There were 5 possible performance regressions, according to the lookback z-score method.

Benchmarks with regressions:

• Commit Run on ursa-i9-9960x at 2024-05-17 08:10:45Z
  • tpch (R) with engine=arrow, format=parquet, language=R, memory_map=False, query_id=TPCH-01, scale_factor=1
  • tpch (R) with engine=arrow, format=native, language=R, memory_map=False, query_id=TPCH-02, scale_factor=1
  • tpch (R) with engine=arrow, format=parquet, language=R, memory_map=False, query_id=TPCH-06, scale_factor=10
  • tpch (R) with engine=arrow, format=parquet, language=R, memory_map=False, query_id=TPCH-06, scale_factor=1
  • tpch (R) with engine=arrow, format=parquet, language=R, memory_map=False, query_id=TPCH-02, scale_factor=1

All benchmark runs analyzed:

• Commit Run on test-mac-arm at 2024-05-17 08:22:01Z
• Commit Run on ec2-t3-xlarge-us-east-2 at 2024-05-17 08:56:40Z
• Commit Run on ursa-i9-9960x at 2024-05-17 08:10:45Z
• Commit Run on ursa-thinkcentre-m75q at 2024-05-17 08:08:05Z
• Commit Run on ec2-m5-4xlarge-us-east-2 at 2024-05-17 07:46:06Z
• Commit Run on arm64-t4g-linux-compute at 2024-05-17 08:43:08Z
• Commit Run on arm64-m6g-linux-compute at 2024-05-17 07:25:40Z

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 test-mac-arm at 2024-05-17 08:22:01Z

  • BM_DeltaBitPackingDecode_Int32_Wide (C++) with params=32768, source=cpp-micro, suite=parquet-encoding-benchmark

• Commit Run on ursa-thinkcentre-m75q at 2024-05-17 08:08:05Z

  • BM_PlainEncodingBoolean (C++) with params=65536, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_PlainEncodingBoolean (C++) with params=32768, source=cpp-micro, suite=parquet-encoding-benchmark