gistfile1.txt

➜  threads  cat read_nonblock.rb 
require 'benchmark'

result = Benchmark.measure do
  (1..4).map { |i|
      f = File.open("tmp#{i}.txt", 'w')
      1.upto(100_000) do
        f.write_nonblock('a' * 100) rescue nil
      end
  }
end

result2 = Benchmark.measure do
  (1..4).map { |i|
    Thread.new do
      f = File.open("tmp#{i}.txt", 'w')
      1.upto(100_000) do
        f.write_nonblock('a' * 100) rescue nil
      end
    end
  }.each(&:join)
end

puts 'non'
puts result
puts 'threaded'
puts result2
➜  threads  cat read_block.rb 
require 'benchmark'

result2 = Benchmark.measure do
  (1..8).map { |i|
    f = File.open("tmp#{i}.txt", 'w')
    1.upto(100_000) do
      f.write('a' * 100) rescue nil
    end
  }
end

result = Benchmark.measure do
  (1..8).map { |i|
    Thread.new do
      f = File.open("tmp#{i}.txt", 'w')
      1.upto(100_000) do
        f.write('a' * 100) rescue nil
      end
    end
  }.each(&:join)
end

puts 'Threaded:'
puts result
puts 'Non threaded 2:'
puts result2