loopbench

loopbench.rb

#!/usr/bin/ruby

# 65 of https://speakerdeck.com/k0kubun/the-method-jit-compiler

[1, 5, 10, 15, 20, 30, 50, 100].each do |n|
  rb = "/tmp/loop_#{n}"
  File.open(rb, "w") do |of|
    n.times{|i|of.puts "def call#{i}() nil end"}
    n.times{|i|of.puts ["call#{i}"] * 5 * '; '}

    of.puts %Q(
puts "sleeping"
sleep #{6.0 * n / 40}
puts "running"

i = 0
before = Process.clock_gettime(Process::CLOCK_MONOTONIC)
while i < 4000000

)

    100.times{|i|of.puts "call#{i % n}"}

    of.puts %Q(
  i += 1
end
after = Process.clock_gettime(Process::CLOCK_MONOTONIC)
p (after - before)

)
  end

  secs = `./ruby --jit #{rb}`.split[-1].to_f
  puts "#{n} #{secs}"
end

result.txt

* nojit

1 4.075788974063471
5 4.4973826529458165
10 4.104485634015873
15 4.152949818992056
20 4.171422621002421
30 4.07525443402119
50 4.214513655053452
100 5.068851265939884

* jit w/ trunk

1 4.999508218024857
5 4.979883964988403
10 4.921854987042025
15 4.962974144029431
20 5.161171301966533
30 5.01176204206422
50 5.277801853953861
100 10.929939543944784

* jit w/ objfcn

1 4.927098701009527
5 4.97255219402723
10 4.979578703059815
15 4.989355263067409
20 4.967847236082889
30 5.549101362004876
50 5.405622696038336
100 5.840275172027759