#!/usr/bin/env bash
# Bytes per instance of the classes that dominate the heap, from GC.class_histogram of the runs made by
# footprint.sh (kept in target/hist). The point: which classes shrink, and which do not.
source "$(dirname "$0")/lib.sh"
H="$MOD/target/hist"
echo "== bytes per instance (= #bytes / #instances) from jcmd GC.class_histogram after loading 2,000,000 products"
printf '%-40s %14s %14s %14s\n' "class" "JDK 26 default" "JDK 27 default" "JDK 27 opt-out"
for cls in 'com.ankurm.memory.Product' 'java.util.HashMap$Node' 'java.lang.Long' 'java.lang.String' '[B'; do
  printf '%-40s' "$cls"
  for cfg in jdk26-default jdk27-default jdk27-optout; do
    awk -v c="$cls" '$4==c {printf " %14.1f", $3/$2; found=1} END{if(!found) printf " %14s","?"}' "$H/$cfg.txt"
  done
  echo
done
echo
echo "== total bytes of those five classes"
for cfg in jdk26-default jdk27-default jdk27-optout; do
  awk -v cfg="$cfg" '$4=="com.ankurm.memory.Product"||$4=="java.util.HashMap$Node"||$4=="java.lang.Long"||$4=="java.lang.String"||$4=="[B" {s+=$3} END{printf "%-16s %d bytes (%.1f MB)\n", cfg, s, s/1048576}' "$H/$cfg.txt"
done