Do threads in Ruby improve concurrency?

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My question is specific to MRI. It looks like since Ruby 1.9 all threads are native but MRI continues to run them one at a time. This sounds like parallel execution of threads is not possible in MRI but does using Threads improve concurrency in your program for something that looks like this?

In other words do you get any benefit from using threads to upload a lot of files onto S3?

# http://ift.tt/1GmM9Y7

...    

file_number = 0
mutex       = Mutex.new
threads     = []

thread_count.times do |i|
  threads[i] = Thread.new {
    until files.empty?
      mutex.synchronize do
        file_number += 1
        Thread.current["file_number"] = file_number
      end
      file = files.pop rescue nil
      next unless file

      data = File.open(file)

      if File.directory?(data)
        data.close
        next
      else
        obj = s3_bucket.objects[path]
        obj.write(data, { acl: :public_read })
        data.close
      end

    end
  }
end
threads.each { |t| t.join }

...

asked 1 min ago

Roman

4,701

Do threads in Ruby improve concurrency?