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 +1,15 @@
+#!/usr/bin/env bash
+# A transcript of the service's own endpoints on JDK 27, so the post can show what a request and the
+# /memory report look like. Port 18081 is fixed so the transcript reads the same every time.
+source "$(dirname "$0")/lib.sh"
+PORT=18081
+"$JDK27/bin/java" -Xms1g -Xmx1g -jar "$JAR" --server.port=$PORT >/dev/null 2>&1 &
+PID=$!
+for _ in $(seq 1 200); do curl -sf "localhost:$PORT/ping" >/dev/null 2>&1 && break; sleep 0.25; done
+for path in "/memory" "/load?n=2000000" "/memory" "/products/42" "/products/2000000"; do
+  echo "\$ curl -s -w ' [HTTP %{http_code}]\n' localhost:$PORT$path"
+  curl -s -w ' [HTTP %{http_code}]\n' "localhost:$PORT$path" | sed 's/^ \[HTTP/[HTTP/'
+  echo
+done
+kill $PID 2>/dev/null; wait $PID 2>/dev/null
+exit 0