After merging your PR, Conbench analyzed the 6 benchmarking runs that have been run so far on merge-commit 9d6d501.

Benchmarks with performance regressions

There were 4 possible performance regressions, according to the lookback z-score method.

Benchmarks with regressions:

• Commit Run on ursa-i9-9960x at 2023-09-21 12:33:35Z
  • tpch (R) with engine=arrow, format=native, language=R, memory_map=False, query_id=TPCH-11, scale_factor=1
  • tpch (R) with engine=arrow, format=parquet, language=R, memory_map=False, query_id=TPCH-10, scale_factor=1
  • 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-10, scale_factor=1

All benchmark runs analyzed:

• Commit Run on ursa-i9-9960x at 2023-09-21 12:33:35Z
• Commit Run on arm64-t4g-linux-compute at 2023-09-21 13:33:16Z
• Commit Run on ec2-m5-4xlarge-us-east-2 at 2023-09-21 12:49:38Z
• Commit Run on ec2-t3-xlarge-us-east-2 at 2023-09-21 12:44:44Z
• Commit Run on arm64-m6g-linux-compute at 2023-09-21 13:29:24Z
• Commit Run on ursa-thinkcentre-m75q at 2023-09-21 19:34:36Z

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 2023-09-21 19:34:36Z
  • CopyShortVector (C++) with params=<STATIC_VECTOR(int)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • BM_DictEncodingInt64_literals (C++) with params=65536, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_ByteStreamSplitEncode_Float_Scalar (C++) with params=65536, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_DictEncodingInt64_repeats (C++) with params=4096, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_ByteStreamSplitEncode_Float_Scalar (C++) with params=32768, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_DictEncodingInt64_repeats (C++) with params=1024, source=cpp-micro, suite=parquet-encoding-benchmark