Improve auto-configuration sorting performance - #51867
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Update `AutoConfigurationSorter` to improve performance by building reverse `@AutoConfigureBefore` relationships while the auto-configuration graph is created and using stable sort ranks during traversal. See spring-projectsgh-51867 Signed-off-by: aalsanie <ahmad.alsanie@hotmail.com>
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Thanks very much @aalsanie! |
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AutoConfigurationSortercurrently performs repeated linear scans while resolving ordering relationships.getClassesRequestedAfter()scans all known auto configrations to reverse@AutoConfigureBefore, while annotation traversal repeatedly usesindexOf(),contains(), and remove from the front ofArrayList.Related to #51643, which identified the same scaling problem. This change takes a different approach by building reverse
@AutoConfigureBeforerelationships while the auto-configuration graph is created and using stable sort ranks during traversal.Here, I remove those repeated scans while keeping the existing ordering behavior.
Performance
Measured against
main.JMH configuration: 3 forks, 5 × 1-second warmup iterations, and 8 × 1-second measurement iterations.
mainNONE, 1024MIXED, 1024FAN_IN, 1024FAN_INscaling:mainI also tested the change in a spring boot application with 1024 ordered synthetic auto-configurations. I ran 20 fresh JVM starts for each version, alternating between baseline and optimized runs.
mainMedian context startup improved by 50.806 ms (2.97%). Here is the benchmark sources with reproduction commands:
https://github.com/aalsanie/spring-boot-auto-configuration-sorter-benchmarks
Verification
Additional tests cover stable ordering for mixed before/after/order relationships, reversed input, duplicate input names, transitively discovered classes, and exact cycle reporting.