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GH-39517: [C++] Disable parallelism for jemalloc external project (#3…

conbench-apache-arrow / Conbench performance report failed Jan 10, 2024

Found 22 regressions

After merging your PR, Conbench analyzed the 6 benchmarking runs that have been run so far on merge-commit 5acf67c.

Benchmarks with performance regressions

There were 22 possible performance regressions, according to the lookback z-score method.

Benchmarks with regressions:

All benchmark runs analyzed:

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.

Details

This report was generated using the lookback z-score method with a z-score threshold of 30.0.