#!/bin/sh
# perf/memcensus.sh — per-app memory limit vs usage census on tsys-cloudron [#685]
#
# Final v3 (v1/v2 had usage-parsing bugs; superseded). Reports per-container
# waste (limit minus usage) for apps with >=1GB limits — the basis for the
# memory-slider shrink table on Discourse t/316.
#
# Run (read-only, from a KNEL/PFVCluster checkout):
#   VM_IP=my.knownelement.com VM_USER=root timeout 120 bash tests/remote.sh vm-file perf/memcensus.sh
# Needs: docker + awk on the host.
# memory census v3 [#685]
docker stats --no-stream --format "{{.Name}} {{.MemUsage}}" > /tmp/ms3.txt
docker ps --format "{{.Names}}" | while read -r n; do
  lim=$(docker inspect "$n" --format '{{.HostConfig.Memory}}' 2>/dev/null)
  fq=$(docker inspect "$n" --format '{{range .Config.Env}}{{println .}}{{end}}' 2>/dev/null | grep -m1 '^CLOUDRON_APP_DOMAIN=' | cut -d= -f2)
  [ -z "$fq" ] && fq=$(docker inspect "$n" --format '{{.Config.Image}}' 2>/dev/null | sed 's|.*/||;s|:.*||')
  echo "$n|$fq|$lim"
done > /tmp/ml3.txt
awk 'NR==FNR {
    gsub(/,/,"");
    if ($2 ~ /G/) u[$1] = $2 * 1024; else u[$1] = $2 + 0;
    next
  }
  {
    split($0, f, "|")
    lim = f[3] / 1048576
    use = u[f[1]] + 0
    if (lim >= 1024)
      printf "%7.0fMB | %-46s | %6.0fMB | %6.0fMB | %3.0f%%\n", lim - use, f[2], lim, use, (lim ? use / lim * 100 : 0)
  }' /tmp/ms3.txt /tmp/ml3.txt | sort -t'|' -k1 -rn | head -30