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chore: Update JMH performance benchmarking baseline - #4229

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sakthivelmanii merged 1 commit into
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change_jmh_baseline
Nov 17, 2025
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chore: Update JMH performance benchmarking baseline#4229
sakthivelmanii merged 1 commit into
mainfrom
change_jmh_baseline

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@sakthivelmanii sakthivelmanii commented Nov 16, 2025

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Description:

Due to local networking, CPU, memory there can be slight variance in performance between runs. 15% is not enough which is producing false positives. Increasing to 20% to avoid false positives.

@sakthivelmanii
sakthivelmanii requested review from a team November 16, 2025 16:56
@product-auto-label product-auto-label Bot added size: xs Pull request size is extra small. api: spanner Issues related to the googleapis/java-spanner API. labels Nov 16, 2025
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Summary of Changes

Hello @sakthivelmanii, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request performs a routine maintenance update to the JMH performance benchmarking baseline. It adjusts the acceptable performance deviation for certain metrics, ensuring that the benchmark results continue to accurately reflect expected performance characteristics and tolerances.

Highlights

  • JMH Baseline Update: The JMH performance benchmarking baseline has been updated. Specifically, the acceptable 'difference' threshold for two 50th percentile metrics within the jmh-baseline.json file was increased from "15" to "20".
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Code Review

This pull request updates the JMH performance benchmark baseline, increasing the allowed performance deviation from 15% to 20% for two benchmarks. This effectively accepts a performance regression. However, the pull request description lacks any justification for this change. It is crucial to document why this performance degradation is acceptable to prevent unintended, cumulative performance regressions in the future. My review includes comments highlighting this and also suggests a minor improvement to use numeric types instead of strings for numeric values in the JSON configuration for better type safety.

@sakthivelmanii
sakthivelmanii merged commit 1511294 into main Nov 17, 2025
41 of 42 checks passed
@sakthivelmanii
sakthivelmanii deleted the change_jmh_baseline branch November 17, 2025 06:56
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