After merging your PR, Conbench analyzed the 4 benchmarking runs that have been run so far on merge-commit 91f7330.

Benchmarks with performance regressions

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

All benchmark runs analyzed:

• Commit Run on ec2-m5-4xlarge-us-east-2 at 2023-12-10 18:32:01Z
• Commit Run on ec2-t3-xlarge-us-east-2 at 2023-12-10 18:55:05Z
• Commit Run on arm64-t4g-linux-compute at 2023-12-10 19:14:26Z
• Commit Run on arm64-m6g-linux-compute at 2023-12-10 22:22:06Z

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-m6g-linux-compute at 2023-12-10 22:22:06Z
  • ThreadedTaskGroup (C++) with params=threads:1/task_cost:100000/real_time, source=cpp-micro, suite=arrow-thread-pool-benchmark