Mini-tool to get the amount of memory being used by a process, *not* the amount of memory plus the size of mmaped files. In other words, it's a way of removing the mmaped size of PIDs.

smapper.rb

#!/usr/bin/env ruby

PID = ARGV.shift
smaps ="/proc/#{PID}/smaps"

if PID.nil?
  warn 'You must specify a PID'
  exit 1
end

begin
  kb = 0
  from = nil

  File.open("/proc/#{PID}/smaps").each do |line|
    if line =~ /^[0-9a-f]+-[0-9a-f]+/i
      from = line.chomp[73..-1] if line =~ /^[0-9a-f]+-[0-9a-f]+/i
    end
    kb += line.split(/\s+/)[1].to_i if line =~ /^Size:/ && (!from || from.include?('[heap]'))
  end

  puts "#{kb / 1024} MB"
rescue
  warn "Couldn't open #{smaps}"
  exit 2
end