After merging your PR, Conbench analyzed the 7 benchmarking runs that have been run so far on merge-commit 61625ad.

Benchmarks with performance regressions

There were 9 possible performance regressions, according to the lookback z-score method.

Benchmarks with regressions:

• Commit Run on ursa-i9-9960x at 2024-04-17 03:22:18Z
  • tpch (R) with engine=arrow, format=native, language=R, memory_map=False, query_id=TPCH-16, scale_factor=1
  • file-read (R) with compression=lz4, dataset=nyctaxi_2010-01, file_type=feather, language=R, output_type=table
  • tpch (R) with engine=arrow, format=parquet, language=R, memory_map=False, query_id=TPCH-15, scale_factor=1
  • file-read (R) with compression=lz4, dataset=nyctaxi_2010-01, file_type=feather, language=R, output_type=dataframe
  • tpch (R) with engine=arrow, format=native, language=R, memory_map=False, query_id=TPCH-17, scale_factor=10
  • file-read (R) with compression=uncompressed, dataset=nyctaxi_2010-01, file_type=feather, language=R, output_type=table
  • tpch (R) with engine=arrow, format=native, language=R, memory_map=False, query_id=TPCH-17, scale_factor=1
  • tpch (R) with engine=arrow, format=native, language=R, memory_map=False, query_id=TPCH-15, scale_factor=1
  • file-read (R) with compression=uncompressed, dataset=nyctaxi_2010-01, file_type=feather, language=R, output_type=dataframe

All benchmark runs analyzed:

• Commit Run on test-mac-arm at 2024-04-16 14:29:52Z
• Commit Run on ursa-i9-9960x at 2024-04-17 03:22:18Z
• Commit Run on ec2-t3-xlarge-us-east-2 at 2024-04-16 10:09:21Z
• Commit Run on arm64-t4g-linux-compute at 2024-04-16 10:14:47Z
• Commit Run on ursa-thinkcentre-m75q at 2024-04-16 12:02:36Z
• Commit Run on ec2-m5-4xlarge-us-east-2 at 2024-04-16 10:49:53Z
• Commit Run on arm64-m6g-linux-compute at 2024-04-16 21:30:26Z

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 2024-04-16 14:29:52Z

  • UniqueUInt8 (C++) with params=6, source=cpp-micro, suite=arrow-compute-vector-hash-benchmark

• Commit Run on arm64-t4g-linux-compute at 2024-04-16 10:14:47Z

  • HexParsing (C++) with params=, source=cpp-micro, suite=arrow-value-parsing-benchmark
  • HexParsing (C++) with params=, source=cpp-micro, suite=arrow-value-parsing-benchmark
  • IntegerParsing (C++) with params=, source=cpp-micro, suite=arrow-value-parsing-benchmark
  • TimestampParsingISO8601 (C++) with params=TimeUnit::MICRO, source=cpp-micro, suite=arrow-value-parsing-benchmark
  • TimestampParsingISO8601 (C++) with params=TimeUnit::NANO, source=cpp-micro, suite=arrow-value-parsing-benchmark
  • BenchmarkTemporalBinary (C++) with params=<MonthsBetween, date64_type>/1048576/0, source=cpp-micro, suite=arrow-compute-scalar-temporal-benchmark

• Commit Run on ursa-thinkcentre-m75q at 2024-04-16 12:02:36Z

  • CopyEmptyVector (C++) with params=<STD_VECTOR(std::shared_ptr)>, source=cpp-micro, suite=arrow-small-vector-benchmark