Total up KVM / qemu VM sizes from ps(1) output

vm-sizes.rb

#!/usr/bin/env ruby

sizes = []
IO.popen("ps waux") do |pipe|
  pipe.each do |line|
    next unless line.match(/qemu/)
    vm       = line.match(%r{qemu/(\w+)\.monitor})[1]
    bits     = line.split(/\s+/)
    vsz, rss = bits[4,5]
    sizes.push({ :vm => vm, :vsz => vsz, :rss => rss })
  end
end

sizes.each do |size|
  puts "#{size[:vm].ljust(32)} rss: #{size[:rss].rjust(16)} vsz: #{size[:vsz].rjust(16)}"
end

rss = sizes.inject(0) { |t,n| t+= n[:rss].to_i } / 1024 / 1024
vsz = sizes.inject(0) { |t,n| t+= n[:vsz].to_i } / 1024 / 1024

puts "total".ljust(32) + " rss: #{rss.to_s.rjust(13)} GB vsz: #{vsz.to_s.rjust(13)} GB"