Example code from RubyConf 2021 talk "Async Ruby" by Bruno Sutic https://www.youtube.com/watch?v=pzpH_ND-CQM

example_ruby_async.rb

# 100 iterations of six 2 second tasks (600 total tasks)
# On my Linux box this ran in 3.567640724s
# the large max connections of 100 for Sequel postgres to minimize wait
# see RubyConf 2021 - Async Ruby by Bruno Sutic https://www.youtube.com/watch?v=pzpH_ND-CQM

# Note: This example code does not include the ssh test included in the talk 
# as I didn't have a server setup for that 
# task.async do
#    Net::SSH.start("191.168.??.??").exec!("sleep 1.5") # takes 2 sec 
# end

require 'async'
require 'open-uri'
require 'httparty'
require 'redis'
# require 'net/ssh'
require "sequel"

DB = Sequel.postgres('mydb', max_connections: 100)
Sequel.extension(:fiber_concurrency)

time = Time.now

iterations = 100

Async do |task|

  iterations.times do
    task.async do
      URI.open('https://httpbin.org/delay/2')
    end

    task.async do
      HTTParty.get('https://httpbin.org/delay/2')
    end

    task.async do
      Redis.new.blpop("abc123", 2)
    end

    task.async do
     DB.run("select pg_sleep(2)")
    end

    task.async do
      sleep 2
    end

    # system commands can run async!
    task.async do
      `sleep 2`
    end
  end
end

puts "Duration #{Time.now - time}s"

Gemfile

source "https://rubygems.org"

gem 'open-uri'
gem 'async'
gem 'async-http'
gem 'httparty'
gem 'redis'
# gem 'net-ssh'
gem 'sequel'