#!/usr/bin/env bash
# What does the switch cost on a machine that used to get Serial?  1 CPU, 2 GB, three runs each.
# Timing is indicative only: one shared machine, one process per run. Read the SHAPE, not the digits.
#   ./scripts/g1-cost.sh              -> docs/output/04-g1-cost-1cpu.txt        (4000 batches, ~6-8 s per run)
#   BATCHES=400 OUTNAME=05-g1-cost-1cpu-short.txt ./scripts/g1-cost.sh   (a short-lived process, e.g. a CI job)
set -euo pipefail
source "$(dirname "$0")/env.sh"
BUILD="$ROOT/build/g1"; mkdir -p "$BUILD"
"$JDK27/bin/javac" --release 26 -d "$BUILD" "$ROOT"/g1-container/src/*.java
RUNS="${RUNS:-3}"; BATCHES="${BATCHES:-4000}"; OUTNAME="${OUTNAME:-04-g1-cost-1cpu.txt}"
{
  echo "# Allocation workload, 1 CPU / 2 GB container, $BATCHES batches x 50,000 objects, $RUNS runs per configuration (indicative, not a benchmark)"
  echo "# 'default' means nobody passed a collector flag."
  echo
  for cfg in "$IMG26|" "$IMG27|" "$IMG27|-XX:+UseSerialGC"; do
    img="${cfg%%|*}"; flag="${cfg##*|}"
    for i in $(seq 1 "$RUNS"); do
      echo "=== $img ${flag:-default} run $i"
      docker run --rm --cpus=1 --memory=2g -v "$BUILD:/app:ro" "$img" \
        java $flag -cp /app Workload "$BATCHES" | grep -v -E '^allocated'
    done
    echo
  done
} > "$OUT/$OUTNAME" 2>&1
cat "$OUT/$OUTNAME"