couchdb_memory

#!/usr/bin/env node
// Munin plugin for CouchDB database io

// Magic Markers for auto-configuration
// #%# family=auto
// #%# capabilities=autoconf suggest

var sys = require("sys")
  , exec = require("child_process").exec
  , mode = "fetch"

// could be "config" or "autoconf" mode
if (process.argv[2] !== undefined) mode = process.argv[2]

exec("free", function(err, data) {
  var total = arguments[1].split("\n")[1].split(/\s+/)[1];

  if (mode === 'config') {
    sys.puts("graph_title CouchDB RAM usage")
    sys.puts("graph_args --base 1024 -l 0 --vertical-label Bytes --upper-limit " + total)
    sys.puts("graph_category couchdb")
    sys.puts("memory_vsize.label virtual memory")
    sys.puts("memory_vsize.draw AREA")
    sys.puts("memory_rss.label real memory")
    sys.puts("memory_rss.draw STACK")
  } else {
    var vsize = 0
      , rss = 0
    exec("ps -U couchdb -u couchdb u", function(err, data) {
      data = data.split("\n")
      data.shift()
      data.pop()

      data.forEach(function(line) {
        var values = line.split(/\s+/)
        vsize += parseInt(values[4])
        rss += parseInt(values[5])
      })

      sys.puts("memory_vsize.value " + (vsize * 1024))
      sys.puts("memory_rss.value " + (rss * 1024))
    })
  }
})