#!/bin/bash
# host_sampler.sh TAG [VMID] — runs on the Proxmox HOST. Every 5 s:
#   ts  rapl_pkg_uj  mem_total_kb  mem_available_kb  guest_mem_current  guest_anon  pkg_temp_mC  cpu_busy_jiffies  cpu_total_jiffies
# rapl_pkg_uj = Intel RAPL package energy counter (CPU package only — NOT wall power).
# Stops when /root/sizing/stop-TAG exists. Read-only: it writes only its own TSV.
TAG=${1:?tag}; VMID=${2:-9201}; D=/root/sizing; mkdir -p "$D"; OUT="$D/host-$TAG.tsv"; rm -f "$D/stop-$TAG"
R=/sys/class/powercap/intel-rapl:0/energy_uj; CG=/sys/fs/cgroup/lxc/$VMID
T=$(for h in /sys/class/hwmon/hwmon*; do [ "$(cat $h/name)" = coretemp ] && echo $h/temp1_input; done | head -1)
echo -e "ts\trapl_pkg_uj\tmem_total_kb\tmem_available_kb\tguest_mem_current\tguest_anon\tpkg_temp_mC\tcpu_busy\tcpu_total" > "$OUT"
while [ ! -e "$D/stop-$TAG" ]; do
  now=$(date +%s); e=$(cat $R 2>/dev/null || echo 0)
  mt=$(awk '/^MemTotal/{print $2}' /proc/meminfo); ma=$(awk '/^MemAvailable/{print $2}' /proc/meminfo)
  gc=$(cat $CG/memory.current 2>/dev/null || echo 0); ga=$(awk '$1=="anon"{print $2}' $CG/memory.stat 2>/dev/null)
  t=$(cat "$T" 2>/dev/null || echo 0)
  read -r busy total < <(awk '/^cpu /{b=$2+$3+$4+$7+$8+$9; t=b+$5+$6; print b,t}' /proc/stat)
  echo -e "$now\t$e\t$mt\t$ma\t$gc\t${ga:-0}\t$t\t$busy\t$total" >> "$OUT"
  sleep 5
done