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Add jdk27-memory: compact object headers and G1-everywhere on a Spring Boot service

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Spring Boot 4.1.1 catalog service measured on JDK 25, 26 and 27: live heap 320 MB to 273 MB with compact headers, per-class bytes per instance, container-sizing sweeps with real cgroup limits, 1-CPU Serial vs G1 with Native Memory Tracking, removed flags (MaxRAM, UseCompressedClassPointers), and a kernel OOM-kill check. Outputs in jdk27-memory/output.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01TF9JWFvJSNm6HVzswzZU5a
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Claude
2026-09-24 15:09:55 +00:00
parent e189da79ba
commit e83c9949d8
29 changed files with 1041 additions and 0 deletions
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jdk27-memory/output/05-container-sizing.txt
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# 2000000 products; 2 CPUs; 3 runs per cell; rss is the median of the runs that finished
== Heap set to 75% of the container (-XX:MaxRAMPercentage=75)
limit heap JDK 26 default JDK 27 default JDK 27 opt-out
400MB 300MB 0/3 ok [1x java-OOM 2x no-result-in-25s] 3/3 ok rss 408MB 0/3 ok [3x killed]
416MB 312MB 0/3 ok [3x java-OOM] 3/3 ok rss 415MB 0/3 ok [3x java-OOM]
432MB 324MB 0/3 ok [3x java-OOM] 3/3 ok rss 406MB 3/3 ok rss 450MB
448MB 336MB 3/3 ok rss 454MB 3/3 ok rss 418MB 3/3 ok rss 458MB
512MB 384MB 3/3 ok rss 468MB 3/3 ok rss 417MB 3/3 ok rss 464MB
704MB 528MB 3/3 ok rss 527MB 3/3 ok rss 431MB 3/3 ok rss 465MB
== Heap left at the JVM default (25% of the container)
limit heap JDK 26 default JDK 27 default JDK 27 opt-out
1024MB 256MB 0/3 ok [3x java-OOM] 0/3 ok [3x java-OOM] 0/3 ok [3x java-OOM]
1152MB 288MB 0/3 ok [3x java-OOM] 3/3 ok rss 410MB 0/3 ok [3x java-OOM]
1216MB 304MB 0/3 ok [3x java-OOM] 3/3 ok rss 409MB 0/3 ok [3x java-OOM]
1280MB 320MB 0/3 ok [3x java-OOM] 3/3 ok rss 408MB 3/3 ok rss 444MB
1536MB 384MB 3/3 ok rss 465MB 3/3 ok rss 417MB 3/3 ok rss 463MB
2048MB 512MB 3/3 ok rss 485MB 3/3 ok rss 435MB 3/3 ok rss 486MB
# runs that needed a startup retry (the JVM never came up, for a reason other than OOM or a kernel kill): 0