Add aot-cache module: the JDK 25 AOT cache on Spring Boot 4.1 vs AppCDS, Spring AOT and GraalVM native

A Spring Boot 4.1.1 order service started 12 ways (plain and extracted jar, Spring AOT output, AppCDS, AOT cache trained with and without traffic, JDK 27, native image), ten interleaved rounds each, with first-request latency; 24 cache-mismatch cases; Docker layer arithmetic. Transcripts are in output/ (no docs/ folder). Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01TF9JWFvJSNm6HVzswzZU5a
2026-09-24 16:44:16 +00:00
parent fa4205f631
commit 3e2029ab3a
30 changed files with 1023 additions and 1 deletions
@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+# Start / probe / stop helpers shared by the measurement scripts.
+source "$(dirname "${BASH_SOURCE[0]}")/env.sh"
+
+PORT=18110
+BODY='{"customer":"[email protected]","sku":"ABC-1234","quantity":3}'
+
+now_ms() { echo $(( $(date +%s%N) / 1000000 )); }
+
+# start_app WORKDIR LOGFILE cmd args...  -> sets APP_PID (the java/native process itself, thanks to exec)
+start_app() {
+  local wd=$1 log=$2; shift 2
+  ( cd "$wd" && exec "$@" ) > "$log" 2>&1 &
+  APP_PID=$!
+}
+
+# wait_ready  -> 0 when GET /ping answers 200 within 60 s
+wait_ready() {
+  local i
+  for i in $(seq 1 3000); do
+    curl -sf -o /dev/null --max-time 2 "localhost:$PORT/ping" && return 0
+    kill -0 "$APP_PID" 2>/dev/null || return 1
+    sleep 0.02
+  done
+  return 1
+}
+
+stop_app() {
+  kill "$APP_PID" 2>/dev/null
+  wait "$APP_PID" 2>/dev/null
+  return 0
+}
+
+# ms_of SECONDS -> milliseconds with one decimal
+ms_of() { awk -v s="$1" 'BEGIN{printf "%.1f", s*1000}'; }
+
+# post_order -> prints curl's time_total in ms
+post_order() {
+  ms_of "$(curl -s -o /dev/null -w '%{time_total}' -H 'Content-Type: application/json' -d "$BODY" "localhost:$PORT/orders")"
+}
+get_order() { ms_of "$(curl -s -o /dev/null -w '%{time_total}' "localhost:$PORT/orders/1")"; }
+
+rss_mb() { awk '/VmRSS/ {printf "%d", $2/1024}' "/proc/$APP_PID/status"; }
+
+median() { sort -n | awk '{a[NR]=$1} END{ if (NR==0) {print "n/a"; exit} if (NR%2) printf "%s", a[(NR+1)/2]; else printf "%.1f", (a[NR/2]+a[NR/2+1])/2 }'; }
+minmax() { sort -n | awk 'NR==1{lo=$1} {hi=$1} END{printf "%s..%s", lo, hi}'; }