After merging your PR, Conbench analyzed the 5 benchmarking runs that have been run so far on merge-commit 7c15568.

Benchmarks with performance regressions

There was 1 possible performance regression, according to the lookback z-score method.

Benchmarks with regressions:

• Commit Run on ec2-m5-4xlarge-us-east-2 at 2024-06-10 01:27:48Z
  • csv-read (Python) with compression=uncompressed, dataset=fanniemae_2016Q4, output_format=arrow_table, streaming=streaming

All benchmark runs analyzed:

• Commit Run on test-mac-arm at 2024-06-10 03:15:11Z
• Commit Run on ursa-thinkcentre-m75q at 2024-06-10 02:39:50Z
• Commit Run on ec2-m5-4xlarge-us-east-2 at 2024-06-10 01:27:48Z
• Commit Run on arm64-t4g-linux-compute at 2024-06-10 02:14:32Z
• Commit Run on arm64-m6g-linux-compute at 2024-06-10 01:05:07Z

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 2024-06-10 03:15:11Z

  • ArrayRangeEqualsBoolean (C++) with params=65536/0, source=cpp-micro, suite=arrow-compare-benchmark
  • ArrayRangeEqualsStruct (C++) with params=65536/1, source=cpp-micro, suite=arrow-compare-benchmark
  • BM_RleDecoding (C++) with params=4096/1, source=cpp-micro, suite=parquet-column-io-benchmark
  • ShortVectorPushBack (C++) with params=<SMALL_VECTOR(std::string)>, source=cpp-micro, suite=arrow-small-vector-benchmark
  • ArrayRangeEqualsBoolean (C++) with params=65536/10000, source=cpp-micro, suite=arrow-compare-benchmark

• Commit Run on ursa-thinkcentre-m75q at 2024-06-10 02:39:50Z

  • BM_ReadColumn (C++) with params=<false,Int32Type>/-1/10, source=cpp-micro, suite=parquet-arrow-reader-writer-benchmark
  • memory_latency (C++) with params=131072/repeats:1, source=cpp-micro, suite=arrow-machine-benchmark

• Commit Run on arm64-t4g-linux-compute at 2024-06-10 02:14:32Z

  • BM_RleEncodingBoolean (C++) with params=65536, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_DeltaBitPackingEncode_Int32_Fixed (C++) with params=32768, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_DeltaBitPackingDecode_Int64_Fixed (C++) with params=4096, source=cpp-micro, suite=parquet-encoding-benchmark