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Add jdk27-perf: the same Spring Boot service measured on JDK 25 and JDK 27

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Live heap, throughput, p99 and startup across four configurations, including opt-in and opt-out of
compact object headers.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01WzVQ6zFh9cuLPj9RSbRH8U
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asmhatre
2026-10-12 17:30:55 +00:00
co-authored by Claude Sonnet 5.5
parent fc05eed4b5
commit d565be93c6
13 changed files with 388 additions and 1 deletions
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jdk27-perf/output/02-runs.txt
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== jdk25 defaults
startup_ms=3437
requests=203628 throughput=6788 req/s p50=0.45 ms p99=3.23 ms p99.9=7.27 ms max=27.80 ms
{"javaVersion":"25.0.4.1","gc":["G1 Young Generation","G1 Concurrent GC","G1 Old Generation"],"compactHeaders":"false","heapUsedMiB":162,"heapCommittedMiB":252,"rssMiB":403}
== jdk25 +CompactObjectHeaders
startup_ms=3658
requests=214723 throughput=7157 req/s p50=0.43 ms p99=2.88 ms p99.9=6.60 ms max=31.57 ms
{"javaVersion":"25.0.4.1","gc":["G1 Young Generation","G1 Concurrent GC","G1 Old Generation"],"compactHeaders":"true","heapUsedMiB":114,"heapCommittedMiB":219,"rssMiB":361}
== jdk27 defaults
startup_ms=3166
requests=218262 throughput=7275 req/s p50=0.44 ms p99=2.76 ms p99.9=6.49 ms max=20.31 ms
{"javaVersion":"27","gc":["G1 Young Generation","G1 Concurrent GC","G1 Old Generation"],"compactHeaders":"true","heapUsedMiB":76,"heapCommittedMiB":284,"rssMiB":434}
== jdk27 -CompactObjectHeaders
startup_ms=3363
requests=216804 throughput=7227 req/s p50=0.43 ms p99=3.00 ms p99.9=6.46 ms max=15.04 ms
{"javaVersion":"27","gc":["G1 Young Generation","G1 Concurrent GC","G1 Old Generation"],"compactHeaders":"false","heapUsedMiB":155,"heapCommittedMiB":310,"rssMiB":458}
== jdk25 defaults
startup_ms=3563
requests=187160 throughput=6239 req/s p50=0.46 ms p99=4.36 ms p99.9=8.83 ms max=35.12 ms
{"javaVersion":"25.0.4.1","gc":["G1 Young Generation","G1 Concurrent GC","G1 Old Generation"],"compactHeaders":"false","heapUsedMiB":108,"heapCommittedMiB":177,"rssMiB":325}
== jdk25 +CompactObjectHeaders
startup_ms=3512
requests=216853 throughput=7228 req/s p50=0.43 ms p99=3.09 ms p99.9=6.54 ms max=20.85 ms
{"javaVersion":"25.0.4.1","gc":["G1 Young Generation","G1 Concurrent GC","G1 Old Generation"],"compactHeaders":"true","heapUsedMiB":158,"heapCommittedMiB":228,"rssMiB":363}
== jdk27 defaults
startup_ms=3220
requests=202647 throughput=6755 req/s p50=0.46 ms p99=3.20 ms p99.9=7.43 ms max=24.21 ms
{"javaVersion":"27","gc":["G1 Young Generation","G1 Concurrent GC","G1 Old Generation"],"compactHeaders":"true","heapUsedMiB":238,"heapCommittedMiB":289,"rssMiB":432}
== jdk27 -CompactObjectHeaders
startup_ms=3539
requests=206016 throughput=6867 req/s p50=0.45 ms p99=3.21 ms p99.9=6.98 ms max=54.74 ms
{"javaVersion":"27","gc":["G1 Young Generation","G1 Concurrent GC","G1 Old Generation"],"compactHeaders":"false","heapUsedMiB":189,"heapCommittedMiB":313,"rssMiB":454}
== jdk25 defaults
startup_ms=3419
requests=206034 throughput=6868 req/s p50=0.45 ms p99=3.14 ms p99.9=6.58 ms max=21.56 ms
{"javaVersion":"25.0.4.1","gc":["G1 Young Generation","G1 Concurrent GC","G1 Old Generation"],"compactHeaders":"false","heapUsedMiB":204,"heapCommittedMiB":273,"rssMiB":415}
== jdk25 +CompactObjectHeaders
startup_ms=3433
requests=192205 throughput=6407 req/s p50=0.47 ms p99=3.75 ms p99.9=7.58 ms max=22.22 ms
{"javaVersion":"25.0.4.1","gc":["G1 Young Generation","G1 Concurrent GC","G1 Old Generation"],"compactHeaders":"true","heapUsedMiB":87,"heapCommittedMiB":154,"rssMiB":313}
== jdk27 defaults
startup_ms=3602
requests=210490 throughput=7016 req/s p50=0.45 ms p99=2.99 ms p99.9=6.26 ms max=16.33 ms
{"javaVersion":"27","gc":["G1 Young Generation","G1 Concurrent GC","G1 Old Generation"],"compactHeaders":"true","heapUsedMiB":128,"heapCommittedMiB":229,"rssMiB":386}
== jdk27 -CompactObjectHeaders
startup_ms=3388
requests=210293 throughput=7010 req/s p50=0.45 ms p99=3.03 ms p99.9=6.68 ms max=32.18 ms
{"javaVersion":"27","gc":["G1 Young Generation","G1 Concurrent GC","G1 Old Generation"],"compactHeaders":"false","heapUsedMiB":227,"heapCommittedMiB":311,"rssMiB":475}