$ bundle

$ gem install vcenter_lib

require 'pp'
require 'benchmark'
require_relative 'lib/vcenter_lib'

options = {}
options[:username]    = 'my_user@vcenter'
options[:password]    = 'my_secret_password'
options[:vcenter_url] = 'vcenter01.ds.my_vcenter.com'
options[:insecure]    = true                      # you might need this

@vcenter = VcenterLib::Vcenter.new(options)
@vm_converter = VcenterLib::VmConverter.new(@vcenter)

puts 'get properties for certain VM'
vm = nil
time = Benchmark.realtime do
  pp vm = @vcenter.find_vm('my_server.my_company.com')
  pp @vm_converter.convert_vm_mor_to_h(vm)
end

puts "run for #{time} seconds"

puts 'get properties for all VMs'    
vms = nil
time = Benchmark.realtime do
  pp (vms = @vm_converter.convert_vm_mobs_to_attr_hash(@vcenter.vms)).size
end

pp vms
puts "run for #{time} seconds"