Ruby Thread Pool

Install

gem install ruby_thread_pool

All In Parallel

require "thread_pool"
require "open-uri"
urls = ["http://google.com", "http://juergenbickert.de", "http://github.com"]
urls.peach {|url| open(url).read }

All urls are retrieved in parallel. There is no limit on the amount of threads run in parallel.

Limited Thread Pool Size

require "thread_pool"
20.times.to_a.peach(10) { sleep(0.1) }

It limits the thread pool size to 10 threads. So at any point in time there are at max running 10 threads, and it finishes in 0.2 seconds.

Why is it better than peach

Because peach fails the third spec, unlike this fine piece of framework

a = [0.01,0.01,0.2,0.2, 0.01, 0.01,0.01,0.01,0.01,0.01]
start = Time.now
a.peach(5) do |time|
  sleep time
end
stop = Time.now
elapsed = stop - start
elapsed.must_be :>=, 0.2
elapsed.must_be :<=, 0.3