Ankur Mhatre
958b401f0f
Adds spring-boot-startup-time/, the companion project for BLOG-618: a runnable Spring Boot 4.1.1 application on JDK 25 that installs BufferingApplicationStartup and FlightRecorderApplicationStartup behind a system property, and a /diag/startup endpoint that computes step self time -- the number /actuator/startup does not give you and the one that names the actual culprits. Captured under docs/output/: the step tree sorted both ways, the same startup as JFR events, a +5000-class experiment putting 0.11 ms per scanned class on the classpath scan tax, the silent truncation a 2048-step buffer performs, and JDK 25 AOT cache timings (6.93 s to 4.82 s). Post body and metadata live in post/. Moves the existing Actuator project into actuator-in-production/ so the repository holds one directory per article; the root README is now an index.
25 lines
707 B
Bash
Executable File
25 lines
707 B
Bash
Executable File
#!/usr/bin/env bash
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# measure-startup.sh <runs> [-- extra java args...]
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# Starts the jar, waits for the "Started ... in Ns" line, records it, stops, repeats.
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set -uo pipefail
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source "$(dirname "$0")/env.sh"
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RUNS="${1:-5}"; shift || true
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[ "${1:-}" = "--" ] && shift
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for i in $(seq 1 "$RUNS"); do
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LOG=$(mktemp)
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"$JAVA_HOME/bin/java" "$@" -jar "$JAR" > "$LOG" 2>&1 &
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PID=$!
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for _ in $(seq 1 120); do
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grep -q 'Started StartupDiagnosisApplication' "$LOG" && break
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kill -0 $PID 2>/dev/null || break
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sleep 0.25
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done
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grep -h 'Started StartupDiagnosisApplication' "$LOG" | sed 's/.*Started/Started/'
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kill -9 $PID 2>/dev/null || true
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wait $PID 2>/dev/null
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rm -f "$LOG"
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sleep 1
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done
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