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.
72 lines
2.6 KiB
Bash
Executable File
72 lines
2.6 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Quantifies what component scanning costs, by adding classes to the scanned package
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# and changing nothing else.
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#
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# baseline : the application as committed
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# +5000 plain : 5000 classes with no annotations -- pure scan cost
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# +5000 @Component : the same 5000, now bean definitions -- scan + define + instantiate
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# +5000 @Component, lazy : lazy init removes the instantiation, not the scan
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#
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# Each variant is a full rebuild. Budget about ten minutes.
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set -uo pipefail
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source "$(dirname "$0")/env.sh"
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cd "$ROOT"
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RUNS="${RUNS:-3}"
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measure() { # measure <label> <extra java args...>
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local label="$1"; shift
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local started=() parse="" inst="" steps=""
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for i in $(seq 1 "$RUNS"); do
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"$ROOT/scripts/stop.sh"
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"$JAVA_HOME/bin/java" -Dstartup.tracking=buffering "$@" -jar "$JAR" > /tmp/scan-app.log 2>&1 &
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local pid=$!
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for _ in $(seq 1 240); do curl -fs -o /dev/null localhost:8080/actuator/health && break; sleep 0.5; done
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started+=("$(grep -ho 'in [0-9.]* seconds' /tmp/scan-app.log | head -1 | awk '{print $2}')")
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if [ "$i" = "1" ]; then
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curl -s 'localhost:8080/diag/startup?top=1' > /tmp/scan-diag.json
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read -r parse inst steps <<<"$(python3 - <<'PY'
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import json
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d = json.load(open('/tmp/scan-diag.json'))
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p = {r['step']: r for r in d['phasesBySelfTime']}
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print(p.get('spring.context.config-classes.parse', {}).get('selfMs', 0),
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p.get('spring.beans.instantiate', {}).get('selfMs', 0),
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d['recordedSteps'])
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PY
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)"
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fi
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kill -9 $pid 2>/dev/null; wait $pid 2>/dev/null
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done
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printf '%-26s | %-18s | %9s | %9s | %6s\n' \
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"$label" "$(IFS=,; echo "${started[*]}")" "$parse" "$inst" "$steps"
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}
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hdr() {
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printf '%-26s | %-18s | %9s | %9s | %6s\n' \
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"variant" "Started in (s)" "parse ms" "instMs" "steps"
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printf -- '---------------------------+--------------------+-----------+-----------+-------\n'
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}
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echo "runs per variant: $RUNS (first run of each also queried for phase self times)"
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echo
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hdr
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./scripts/gen-bulk.sh 0 plain >/dev/null 2>&1 || true
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rm -rf src/main/java/com/ankurm/startup/bulk
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mvn -B -q -DskipTests package > /tmp/scan-build.log 2>&1
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measure "baseline"
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./scripts/gen-bulk.sh 5000 plain > /dev/null
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mvn -B -q -DskipTests package > /tmp/scan-build.log 2>&1
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measure "+5000 plain classes"
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./scripts/gen-bulk.sh 5000 component > /dev/null
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mvn -B -q -DskipTests package > /tmp/scan-build.log 2>&1
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measure "+5000 @Component"
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measure "+5000 @Component, lazy" -Dspring.profiles.active=lazy
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rm -rf src/main/java/com/ankurm/startup/bulk
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mvn -B -q -DskipTests package > /tmp/scan-build.log 2>&1
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echo
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echo "bulk package removed; jar rebuilt at baseline."
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true
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