#!/usr/bin/env bash
# Builds everything and runs the JMH comparison (FFM vs JNI vs plain Java). About 4 minutes. Writes output/10-jmh.txt.
# Needs: JAVA_HOME (JDK 25), gcc, libsqlite3-dev, and `scripts/fetch-jmh.sh` run once. JEXTRACT is only needed by gen.sh, not here.
set -uo pipefail
unset JAVA_TOOL_OPTIONS
HERE="$(cd "$(dirname "$0")/.." && pwd)"; cd "$HERE"
JAVA_HOME="${JAVA_HOME:?set JAVA_HOME to a JDK 25}"
BUILD="${BUILD:-$HERE/build}"; mkdir -p "$BUILD/classes" "$HERE/output"
"$HERE/scripts/build-jni.sh" >/dev/null
CP="$(ls bench/lib/*.jar | tr '\n' ':')"
"$JAVA_HOME/bin/javac" -cp "$CP:$BUILD/jni-classes" -processorpath "$CP" -d "$BUILD/classes" \
  $(find generated src bench/src -name '*.java') 2>&1 | grep -v '^Note:'
OPTS=(-f 5 -wi 3 -w 1 -i 5 -r 1)
{
  echo "\$ java --enable-native-access=ALL-UNNAMED -Djava.library.path=build/lib org.openjdk.jmh.Main ${OPTS[*]}     ($("$JAVA_HOME/bin/java" -version 2>&1 | sed -n 2p | sed 's/.*(build \(.*\))/\1/'), JMH 1.37)"
  echo "machine: $(nproc) CPUs, $(grep -m1 'model name' /proc/cpuinfo | sed 's/.*: //')"
  echo "load average before the run: $(cut -d" " -f1-3 /proc/loadavg)   (1, 5, 15 minutes; this box has 2 CPUs and was shared with other jobs)"
  echo "sqlite: $(dpkg-query -W -f='${Package} ${Version}' libsqlite3-dev 2>/dev/null)"
  "$JAVA_HOME/bin/java" -cp "$BUILD/classes:$BUILD/jni-classes:$CP" org.openjdk.jmh.Main "${OPTS[@]}" \
    -jvmArgs "--enable-native-access=ALL-UNNAMED -Djava.library.path=$BUILD/lib" 2>&1 | sed -n '/^Benchmark /,$p'
  echo "load average after the run: $(cut -d' ' -f1-3 /proc/loadavg)"
} > "$HERE/output/10-jmh.txt"
cat "$HERE/output/10-jmh.txt"