Ruby block chain performance

block.rb

require "benchmark/ips"

class A
  def meth1(&block)
    meth2(&block)
  end

  def meth2
    yield
  end
end

class B
  def meth1(&block)
    meth2(&block)
  end

  def meth2(&block)
    block.call
  end
end

class C
  def meth1
    meth2(&Proc.new)
  end

  def meth2
    yield
  end
end

puts "ruby #{RUBY_VERSION}p#{RUBY_PATCHLEVEL} (#{RUBY_RELEASE_DATE} #{RUBY_REVISION}) [#{RUBY_PLATFORM}]"
puts

Benchmark.ips do |x|
  x.report("&block - yield") { A.new.meth1 { 1 } }
  x.report("&block - block.call") { B.new.meth1 { 1 } }
  x.report("&Proc.new - yield") { C.new.meth1 { 1 } }

  x.compare!
end

__END__

ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-linux]

Warming up --------------------------------------
      &block - yield   317.786k i/100ms
 &block - block.call   300.332k i/100ms
   &Proc.new - yield   212.321k i/100ms
Calculating -------------------------------------
      &block - yield      6.327M (± 5.6%) i/s -     31.779M in   5.042957s
 &block - block.call      5.558M (± 4.9%) i/s -     27.931M in   5.039385s
   &Proc.new - yield      3.140M (± 5.7%) i/s -     15.712M in   5.023740s

Comparison:
      &block - yield:  6327003.6 i/s
 &block - block.call:  5557820.3 i/s - 1.14x  slower
   &Proc.new - yield:  3139735.8 i/s - 2.02x  slower

---

ruby 2.5.3p105 (2018-10-18 65156) [x86_64-linux]

Warming up --------------------------------------
      &block - yield   309.451k i/100ms
 &block - block.call   176.420k i/100ms
   &Proc.new - yield   193.108k i/100ms
Calculating -------------------------------------
      &block - yield      5.780M (± 7.1%) i/s -     28.779M in   5.013362s
 &block - block.call      2.427M (± 6.7%) i/s -     12.173M in   5.042566s
   &Proc.new - yield      2.730M (± 5.1%) i/s -     13.711M in   5.036934s

Comparison:
      &block - yield:  5779832.0 i/s
   &Proc.new - yield:  2729992.8 i/s - 2.12x  slower
 &block - block.call:  2427171.3 i/s - 2.38x  slower

---

ruby 2.4.1p111 (2017-03-22 58053) [x86_64-linux]

Warming up --------------------------------------
      &block - yield   185.991k i/100ms
 &block - block.call   165.535k i/100ms
   &Proc.new - yield   181.499k i/100ms
Calculating -------------------------------------
      &block - yield      2.666M (± 5.7%) i/s -     13.391M in   5.041754s
 &block - block.call      2.391M (± 5.4%) i/s -     11.919M in   5.001634s
   &Proc.new - yield      2.555M (± 6.8%) i/s -     12.886M in   5.071558s

Comparison:
      &block - yield:  2665830.7 i/s
   &Proc.new - yield:  2555084.3 i/s - same-ish: difference falls within error
 &block - block.call:  2390739.4 i/s - same-ish: difference falls within error