After merging your PR, Conbench analyzed the 7 benchmarking runs that have been run so far on merge-commit 9f58990.

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 2024-06-06 07:18:42Z
• Commit Run on arm64-t4g-linux-compute at 2024-05-29 08:08:12Z
• Commit Run on ursa-thinkcentre-m75q at 2024-05-29 06:32:35Z
• Commit Run on ec2-m5-4xlarge-us-east-2 at 2024-05-29 05:52:50Z
• Commit Run on arm64-m6g-linux-compute at 2024-05-29 06:01:21Z
• Commit Run on test-mac-arm at 2024-05-29 13:04:13Z
• Commit Run on ec2-t3-xlarge-us-east-2 at 2024-05-29 19:23:11Z

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 arm64-t4g-linux-compute at 2024-05-29 08:08:12Z

  • ArrayScalarKernel (C++) with params=<DivideChecked, UInt8Type>/size:1048576/inverse_null_proportion:0, source=cpp-micro, suite=arrow-compute-scalar-arithmetic-benchmark
  • ArrayScalarKernel (C++) with params=<DivideChecked, Int8Type>/size:1048576/inverse_null_proportion:0, source=cpp-micro, suite=arrow-compute-scalar-arithmetic-benchmark
  • ValueCountsDictionaryChunks (C++) with params=6, source=cpp-micro, suite=arrow-compute-vector-hash-benchmark
  • CompressedInputStreamNonZeroCopyBufferProvidedByCaller (C++) with params=Compression::LZ4_FRAME/num_bytes:65536/batch_size:8192, source=cpp-micro, suite=arrow-io-compressed-benchmark
  • CompressedInputStreamNonZeroCopyBufferProvidedByCaller (C++) with params=Compression::LZ4_FRAME/num_bytes:65536/batch_size:65536, source=cpp-micro, suite=arrow-io-compressed-benchmark
  • CompressedInputStreamNonZeroCopyBufferProvidedByCaller (C++) with params=Compression::LZ4_FRAME/num_bytes:1048576/batch_size:65536, source=cpp-micro, suite=arrow-io-compressed-benchmark

• Commit Run on ursa-thinkcentre-m75q at 2024-05-29 06:32:35Z

  • BM_DeltaBitPackingEncode_Int64_Wide (C++) with params=4096, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_DeltaBitPackingEncode_Int64_Wide (C++) with params=1024, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_DictEncodingInt64_repeats (C++) with params=65536, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_DeltaBitPackingEncode_Int64_Fixed (C++) with params=32768, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_DeltaBitPackingEncode_Int32_Fixed (C++) with params=65536, source=cpp-micro, suite=parquet-encoding-benchmark

• Commit Run on test-mac-arm at 2024-05-29 13:04:13Z

  • TakeChunkedChunkedFSBRandomIndicesNoNulls (C++) with params=4194304/1/9, source=cpp-micro, suite=arrow-compute-vector-selection-benchmark
  • TakeChunkedChunkedFSBRandomIndicesWithNulls (C++) with params=4194304/1000/9, source=cpp-micro, suite=arrow-compute-vector-selection-benchmark
  • TakeChunkedChunkedFSBRandomIndicesNoNulls (C++) with params=4194304/1000/9, source=cpp-micro, suite=arrow-compute-vector-selection-benchmark
  • TakeChunkedChunkedFSBRandomIndicesNoNulls (C++) with params=4194304/2/9, source=cpp-micro, suite=arrow-compute-vector-selection-benchmark
  • TakeChunkedChunkedFSBRandomIndicesNoNulls (C++) with params=4194304/10/9, source=cpp-micro, suite=arrow-compute-vector-selection-benchmark
  • Int8StridedMatrixConversionFixture (C++) with params=/ConvertToSparseCSRMatrixInt8, source=cpp-micro, suite=arrow-tensor-conversion-benchmark
  • TakeChunkedChunkedFSBRandomIndicesWithNulls (C++) with params=4194304/0/9, source=cpp-micro, suite=arrow-compute-vector-selection-benchmark
  • Int8ColumnMajorMatrixConversionFixture (C++) with params=/ConvertToSparseCSRMatrixInt8, source=cpp-micro, suite=arrow-tensor-conversion-benchmark