Left file: appwork-v1_3_1/rails-starter/config/puma.rb  
Right file: appwork-v1_4_0/rails-turbolinks-starter/config/puma.rb  

# Puma can serve each request in a thread from an internal thread pool.	=	# Puma can serve each request in a thread from an internal thread pool.
# The `threads` method setting takes two numbers: a minimum and maximum.		# The `threads` method setting takes two numbers: a minimum and maximum.
# Any libraries that use thread pools should be configured to match		# Any libraries that use thread pools should be configured to match
# the maximum value specified for Puma. Default is set to 5 threads for minimum		# the maximum value specified for Puma. Default is set to 5 threads for minimum
# and maximum; this matches the default thread size of Active Record.		# and maximum; this matches the default thread size of Active Record.
#		#
threads_count = ENV.fetch("RAILS_MAX_THREADS") { 5 }	<>	max_threads_count = ENV.fetch("RAILS_MAX_THREADS") { 5 }
		min_threads_count = ENV.fetch("RAILS_MIN_THREADS") { max_threads_count }
threads threads_count, threads_count		threads min_threads_count, max_threads_count
	=
# Specifies the `port` that Puma will listen on to receive requests; default is 3000.		# Specifies the `port` that Puma will listen on to receive requests; default is 3000.
#		#
port        ENV.fetch("PORT") { 3000 }		port        ENV.fetch("PORT") { 3000 }
# Specifies the `environment` that Puma will run in.		# Specifies the `environment` that Puma will run in.
#		#
environment ENV.fetch("RAILS_ENV") { "development" }		environment ENV.fetch("RAILS_ENV") { "development" }
	-+
		# Specifies the `pidfile` that Puma will use.
		pidfile ENV.fetch("PIDFILE") { "tmp/pids/server.pid" }
	=
# Specifies the number of `workers` to boot in clustered mode.		# Specifies the number of `workers` to boot in clustered mode.
# Workers are forked webserver processes. If using threads and workers together	<>	# Workers are forked web server processes. If using threads and workers together
# the concurrency of the application would be max `threads` * `workers`.	=	# the concurrency of the application would be max `threads` * `workers`.
# Workers do not work on JRuby or Windows (both of which do not support		# Workers do not work on JRuby or Windows (both of which do not support
# processes).		# processes).
#		#
# workers ENV.fetch("WEB_CONCURRENCY") { 2 }		# workers ENV.fetch("WEB_CONCURRENCY") { 2 }
# Use the `preload_app!` method when specifying a `workers` number.		# Use the `preload_app!` method when specifying a `workers` number.
# This directive tells Puma to first boot the application and load code		# This directive tells Puma to first boot the application and load code
# before forking the application. This takes advantage of Copy On Write		# before forking the application. This takes advantage of Copy On Write
# process behavior so workers use less memory.		# process behavior so workers use less memory.
#		#
# preload_app!		# preload_app!
# Allow puma to be restarted by `rails restart` command.		# Allow puma to be restarted by `rails restart` command.
plugin :tmp_restart		plugin :tmp_restart