Munin contributed plugins

#!/usr/bin/env ruby

# thin_peak_memory - 

#     A munin plugin for Linux to monitor the maximum memory size

#     that an each individual thin process has reached

# 

# For Linux ONLY !

# DOES NOT WORK on OSX, Solaris or BSD.

# only linux, because this script relies on proc filesystem

#

# Author: 

#   Frederico de Souza Araujo - fred.the.master@gmail.com

#   http://www.frederico-araujo.com

#

# Based on:

#   thin_process_memory - 

#       A munin plugin to monitor memory size of 

#       each individual thin process

#   by Ben VandenBos and Avvo, Inc.

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License version 2 

# as published by the Free Software Foundation.

# 

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

# 

# You should have received a copy of the GNU General Public License along

# with this program; if not, write to the Free Software Foundation, Inc.,

# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

#

#

#%# family=auto

#%# capabilities=autoconf

module Munin

  class ThinPeakMemory

    def run

      pids = get_pids()

      port_list = Hash.new

      pids.sort.each do |pid, port|

        hwm = (pid_hwm(pid).to_i)/1024

        puts "thin_#{port}.value #{hwm}"

      end

    end

    # only get VmHWM count for each pid

    #  (Virtual Memory High Water Mark)

    # Using Proc filesystem

    # ONLY LINUX! because relies on proc filesystem

    # TODO: make this work on OSX and Solaris,

    #      so the whole unix gang is happy ;)

    def pid_hwm(pid)

      res = `grep "VmHWM" /proc/#{pid}/status`.split[1]

      if res.match("cannot access")

        return nil

      else

        return res

      end

    end

    # Get pis using lsof (list open files) 

    #   look for listening tcp applications 

    #   that match the name thin

    def get_pids

      pids_ports = []

      pids = `pgrep thin`.split

      pids.each do |t|

        port = `lsof -p #{t} | grep LISTEN`.split[8]

        port = port.split(":")[1]

        pids_ports << [t,port]

      end

      pids_ports

    end

    def autoconf

      get_pids().length > 0

    end

  end

end

mpm = Munin::ThinPeakMemory.new

case ARGV[0]

when "config"

  puts "graph_title Thin Peak Memory (High Water Mark)"

  puts "graph_vlabel HWM"

  puts "graph_category Thin"

  puts "graph_args -l 0"

  puts "graph_scale yes"

  puts "graph_info Tracks the peak memory of thin processes, aka High Water Mark."

  mpm.get_pids.sort.each do |pid,port|

    puts "thin_#{port}.label thin_#{port}"

    puts "thin_#{port}.info Peak Memory"

    puts "thin_#{port}.type GAUGE"

    puts "thin_#{port}.min 0"

  end

when "autoconf"

  if mpm.autoconf

    puts "yes"

    exit 0

  end

  puts "no"

  exit 1

else

  mpm.run

end