After merging your PR, Conbench analyzed the 7 benchmarking runs that have been run so far on merge-commit 605f8a7.

Benchmarks with performance regressions

There were 0 possible performance regressions, according to the lookback z-score method.

All benchmark runs analyzed:

• Commit Run on ursa-i9-9960x at 2024-03-11 22:07:47Z
• Commit Run on ec2-t3-xlarge-us-east-2 at 2024-03-11 22:32:35Z
• Commit Run on ec2-m5-4xlarge-us-east-2 at 2024-03-12 07:05:40Z
• Commit Run on ursa-thinkcentre-m75q at 2024-03-12 07:32:20Z
• Commit Run on arm64-t4g-linux-compute at 2024-03-12 08:53:06Z
• Commit Run on test-mac-arm at 2024-03-12 11:29:26Z
• Commit Run on arm64-m6g-linux-compute at 2024-03-12 15:39:03Z

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 2024-03-12 07:32:20Z

  • BM_DeltaBitPackingEncode_Int32_Wide (C++) with params=32768, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_DeltaBitPackingEncode_Int32_Narrow (C++) with params=65536, source=cpp-micro, suite=parquet-encoding-benchmark

• Commit Run on arm64-t4g-linux-compute at 2024-03-12 08:53:06Z

  • ExecuteScalarExpressionOverhead (C++) with params=ref_only_expression/rows_per_batch:1000/real_time/threads:8, source=cpp-micro, suite=arrow-acero-expression-benchmark

• Commit Run on test-mac-arm at 2024-03-12 11:29:26Z

  • ChunkCSVStocksExample (C++) with source=cpp-micro, suite=arrow-csv-parser-benchmark
  • SchemaEquals (C++) with source=cpp-micro, suite=arrow-type-benchmark
  • SchemaEqualsWithMetadata (C++) with source=cpp-micro, suite=arrow-type-benchmark