#!/usr/bin/env bash
# Regenerates every file in output/. Set J25, J27, J28 to the three JDK home directories.
# Timing results drift between runs and machines; treat them as indicative, not exact.
set -u
HERE="$(cd "$(dirname "$0")" && pwd)"
OUT="$HERE/../output"; mkdir -p "$OUT"
: "${J25:?}" "${J27:?}" "${J28:?}"
export JDK_CLIENT="$J25"
RUNS=${RUNS:-5}

# 01 - what does each JDK say about the ZGC flags the two JEPs talk about?
{
  for p in "25|$J25" "27|$J27" "28-ea|$J28"; do
    v=${p%%|*}; h=${p#*|}
    echo "== JDK $v"
    "$h/bin/java" -version 2>&1 | grep -v Picked | sed -n 1p
    "$h/bin/java" -XX:+UnlockExperimentalVMOptions -XX:+UseZGC -XX:+PrintFlagsFinal -version 2>&1 \
      | grep -E ' (InitialHeapSize|MaxHeapSize|SoftMaxHeapSize|ZUncommit|ZUncommitDelay) ' | sed 's/ \{2,\}/ /g'
    echo "-- probing -XX:+ZAdaptiveHeapSizing"
    "$h/bin/java" -XX:+UseZGC -XX:+ZAdaptiveHeapSizing -version 2>&1 | grep -v Picked | sed -n 1p
    echo
  done
} > "$OUT/01-flag-probe.txt"

# 02 - startup versus initial heap size
{
  for p in "jdk25|$J25" "jdk27|$J27" "jdk28ea|$J28"; do
    l=${p%%|*}; h=${p#*|}
    "$HERE/startup.sh" "$h" "$l zgc default"      "$RUNS" -XX:+UseZGC
    "$HERE/startup.sh" "$h" "$l zgc Xms64m"       "$RUNS" -XX:+UseZGC -Xms64m
    "$HERE/startup.sh" "$h" "$l zgc Xms1g"        "$RUNS" -XX:+UseZGC -Xms1g
    "$HERE/startup.sh" "$h" "$l zgc Xms3g"        "$RUNS" -XX:+UseZGC -Xms3g
    "$HERE/startup.sh" "$h" "$l zgc Xms3g pretouch" "$RUNS" -XX:+UseZGC -Xms3g -XX:+AlwaysPreTouch
  done
} > "$OUT/02-startup-vs-xms.txt" 2>&1

# 03 - warmup: how long do the first 20,000 requests take?
{
  for p in "jdk25|$J25" "jdk28ea|$J28"; do
    l=${p%%|*}; h=${p#*|}
    "$HERE/warmup.sh" "$h" "$l zgc default"  -XX:+UseZGC
    "$HERE/warmup.sh" "$h" "$l zgc Xms3g"    -XX:+UseZGC -Xms3g
    "$HERE/warmup.sh" "$h" "$l zgc Xms64m"   -XX:+UseZGC -Xms64m
  done
} > "$OUT/03-warmup.txt" 2>&1