workers by cpu count

puma_example.rb

#!/usr/bin/env puma

# Ruby 2.2.0+ required

require 'etc'

current_path = 'CURRENT_PATH'
shared_path = 'SHARED_PATH'

directory current_path
rackup "#{current_path}/config.ru"
environment 'production'

pidfile "#{shared_path}/tmp/pids/puma.pid"
state_path "#{shared_path}/tmp/pids/puma.state"
stdout_redirect '#{shared_path}/log/puma_access.log', '#{shared_path}/log/puma_error.log', true

bind 'unix://#{shared_path}/tmp/sockets/puma.sock'

# 根据 CPU 核数来确定 workers 的数量
workers(Etc.nprocessors)
daemonize true
prune_bundler

on_restart do
  puts 'Refreshing Gemfile'
  ENV["BUNDLE_GEMFILE"] = "#{current_path}/Gemfile"
end

If you are using Ruby < 2.2.0, please use as follow instead.

count = `nproc`.to_i

Note: please ensure you have installed the nproc in your *nix server.