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Add shenandoah-jdk28: generational vs SATB Shenandoah, G1 and ZGC on a Spring Boot service (JEP 535 status probe included)

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Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01HmvoHH3ZnCEaPNXRpDxDZe
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Claude
2026-10-24 10:53:17 +00:00
parent df13a904d7
commit b25bd65d4b
14 changed files with 460 additions and 0 deletions
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shenandoah-jdk28/scripts/probe.sh
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#!/usr/bin/env bash
# What does plain -XX:+UseShenandoahGC select on each JDK? Needs J25 and J28 pointing at JDKs that include Shenandoah
# (Temurin does; the Oracle builds from jdk.java.net do not).
set -u
for entry in "JDK 25:$J25" "JDK 28 EA:$J28"; do
name=${entry%%:*}; home=${entry#*:}
echo "== $name: $(env -u JAVA_TOOL_OPTIONS "$home/bin/java" -version 2>&1 | sed -n 3p)"
echo "-- java -XX:+UseShenandoahGC -Xlog:gc+init -version"
env -u JAVA_TOOL_OPTIONS "$home/bin/java" -XX:+UseShenandoahGC -Xlog:gc+init -Xmx256m -version 2>&1 | grep -E 'Mode:|warning|WARNING|deprecat'
echo "-- java -XX:+UseShenandoahGC -XX:+PrintFlagsFinal -version (ShenandoahGCMode)"
env -u JAVA_TOOL_OPTIONS "$home/bin/java" -XX:+UseShenandoahGC -XX:+PrintFlagsFinal -Xmx256m -version 2>&1 | grep -E 'ShenandoahGCMode'
echo "-- java -XX:+UseShenandoahGC -XX:ShenandoahGCMode=generational -Xlog:gc+init -version"
env -u JAVA_TOOL_OPTIONS "$home/bin/java" -XX:+UseShenandoahGC -XX:ShenandoahGCMode=generational -Xlog:gc+init -Xmx256m -version 2>&1 | grep -E 'Mode:|warning|WARNING|deprecat'
echo "-- java -XX:+UseShenandoahGC -XX:ShenandoahGCMode=satb -Xlog:gc+init -version"
env -u JAVA_TOOL_OPTIONS "$home/bin/java" -XX:+UseShenandoahGC -XX:ShenandoahGCMode=satb -Xlog:gc+init -Xmx256m -version 2>&1 | grep -E 'Mode:|warning|WARNING|deprecat'
echo
done