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

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
2026-09-24 15:09:55 +00:00
parent e189da79ba
commit e83c9949d8
29 changed files with 1041 additions and 0 deletions
@@ -0,0 +1,41 @@
+$ curl -s -w ' [HTTP %{http_code}]\n' localhost:18081/memory
+java.version=27
+UseCompactObjectHeaders=true
+collectors=[G1 Young Generation, G1 Concurrent GC, G1 Old Generation]
+availableProcessors=2
+maxHeapMB=1024
+products=0
+heapLiveAfterGcMB=12
+heapCommittedMB=1024
+rssMB=238
+gcCountTotal=7
+gcMillisTotal=121
+[HTTP 200]
+
+$ curl -s -w ' [HTTP %{http_code}]\n' localhost:18081/load?n=2000000
+loaded=2000000
+loadMillis=237
+gcCountDuringLoad=0
+gcMillisDuringLoad=0
+[HTTP 200]
+
+$ curl -s -w ' [HTTP %{http_code}]\n' localhost:18081/memory
+java.version=27
+UseCompactObjectHeaders=true
+collectors=[G1 Young Generation, G1 Concurrent GC, G1 Old Generation]
+availableProcessors=2
+maxHeapMB=1024
+products=2000000
+heapLiveAfterGcMB=272
+heapCommittedMB=1024
+rssMB=417
+gcCountTotal=9
+gcMillisTotal=626
+[HTTP 200]
+
+$ curl -s -w ' [HTTP %{http_code}]\n' localhost:18081/products/42
+{"id":42,"priceCents":142,"stock":42,"active":true,"sku":"SKU-100000042"} [HTTP 200]
+
+$ curl -s -w ' [HTTP %{http_code}]\n' localhost:18081/products/2000000
+{"timestamp":"2026-09-24T14:57:54.671Z","status":404,"error":"Not Found","path":"/products/2000000"} [HTTP 404]
+