run N requests with X concurrency

http_load.rb

require 'em-synchrony'
require 'em-synchrony/em-http'

EM.synchrony do
    EM::Synchrony::Iterator.new(1..ARGV[0].to_i, ARGV[1].to_i).each do |num, iter|
      c = EM::HttpRequest.new('http://127.0.0.1:9000/').aget
      c.callback {iter.next}
    end

  EM.stop
end