ActiveRecord memory size usage (minimal and all)

ar-mem-size.rb

#!/usr/bin/env ruby

require 'get_process_mem'

def mem_usage(label)
  Process.fork do
    m_before = mem_size
    yield
    m_after = mem_size
    $stderr.printf "%30s: delta: %+3d MB  total: %5d MB\n", label, (m_after - m_before), m_after
  end
end

def mem_size(digits=0)
  @mem ||= GetProcessMem.new
  @mem.mb.round(0)
end

mem_usage('Require active_support')     { require 'active_support' }
mem_usage('Require active_support/all') { require 'active_support/all' }

$stderr.flush
exit

gistfile1.txt

         Require active_support: delta: +12 MB  total:    14 MB
     Require active_support/all: delta: +24 MB  total:    25 MB