gistfile1.txt

require 'benchmark'

NUM_THREADS = 60
NUM_OPENS = 40_000
TEMP_FILE = '/tmp/umask_contention'

File.open(TEMP_FILE, 'w') do |f|
  f.write("umask contention, man\n" * 100)
end

puts Benchmark.measure {
  threads = NUM_THREADS.times.map do
    Thread.new do
      NUM_OPENS.times do
        file = File.open(TEMP_FILE)
        file.read(5)
        file.close
      end
    end
  end
  threads.each(&:join)
}