Ruby Benchmark with ObjectSpace

gistfile1.txt

require 'objspace'
require 'benchmark' 

Benchmark.bmbm do |bm|
  bm.report("using [] :") do

    GC.start
    mem_before = ObjectSpace.memsize_of_all
    before = GC.stat[:total_allocated_objects]
    
    1000.times do |i|
      user = User.where(username: "asdf")
      user.any?
    end
    mem_after = ObjectSpace.memsize_of_all
    after = GC.stat[:total_allocated_objects]
    puts "Allocations: #{after - before} - Memory: #{mem_after - mem_before}"
  end
  
  bm.report("using merge :") do
    GC.start
    mem_before = ObjectSpace.memsize_of_all
    before = GC.stat[:total_allocated_objects]
    1000.times do |i|
      user = User.where(username: "asdf")
      user.none?
    end
    mem_after = ObjectSpace.memsize_of_all
    after = GC.stat[:total_allocated_objects]
    puts "Allocations: #{after - before} - Memory: #{mem_after - mem_before}"
  end
end


Benchmark.bmbm do |bm|
  bm.report('using += :') do
    str = "so"
    100000.times do { str += " this is slower " }
  end
  bm.report('using << :' do
    str = "so"
    100000.times do { str << " this is faster " }
  end
end