Cpu bound task threading benchmark.

threading_cpu_bound.rb

require 'benchmark'

N_OPS = 100_000_000
N_THREADS = 10
BM_LABEL_WIDTH = 15

def func(n_ops)
  (1..n_ops).each { 1 + 1 }
end

Benchmark.bm(BM_LABEL_WIDTH) do |x|
  x.report("1 thread: ") do
    func(N_OPS)
  end
  x.report("#{N_THREADS} threads: ") do
    threads = []
    (1..N_THREADS).each do |n|
    	threads << Thread.new { func(N_OPS / N_THREADS) }
    end
    threads.each { |thread| thread.join }
  end
end