#!/bin/sh
if [ "$1" = "config" ]; then
  echo "graph_title Memory usage (in MB)"
  echo 'graph_category system'
  echo "acti.label Active momery"
  echo "total.label Memory total"
  echo "free.label Free memory"
  echo "swap.label Swap in use"
  echo "swapt.label Swap total"
  exit 0
fi

# Memory: Real: 14M/69M act/tot  Free: 173M  Swap: 0K/612M used/tot

top -un | nawk '
function scale(v) {
  if (value ~ /G$/) { sub("G", "", v); v *= 1024 }
  else if (v ~ /M$/) sub("M", "", v)
  else if (v ~ /K$/) { sub("K", "", v); v /= 1024 }
  else v /= 1024 * 1024;
  return v;
}
function spliter(v, i) {
  split(v,a,"/");
  return(a[i]);
}
/^Memory/ {
  acti  = scale(spliter($3,1));
  total = scale(spliter($3,2));
  free  = scale($6);
  swap  = scale(spliter($8,1));
  swapt = scale(spliter($8,2));

  print "acti.value", acti
  print "total.value", total
  print "free.value", free
  print "swap.value", swap
  print "swapt.value", swapt
}'