Some minor puma tweaks

.env.sample

@@ -4,6 +4,4 @@
 # https://devcenter.heroku.com/articles/heroku-local#set-up-your-local-environment-variables
 
 PORT=3000
-
-# PUMA_WORKERS=1
-PUMA_THREADS=5
+RAILS_MAX_THREADS=5

README.md

@@ -132,6 +132,7 @@ Several common features and operational parameters can be set using environment
 * `PORT` - Port to listen on (default: 3000).
 * `WEB_CONCURRENCY` - Number of puma workers to spawn (default: 1).
 * `RAILS_MAX_THREADS` - Threads per worker (default: 5).
+* `RAILS_MIN_THREADS` - Threads per worker (default: 5).
 * `DB_POOL` - Number of DB connections per pool (i.e. per worker) (default: RAILS_MAX_THREADS or 5).
 * `RAILS_LOG_TO_STDOUT` - Log to standard out, good for Heroku (default: false).
 * `RAILS_SERVE_STATIC_FILES` - Serve static assets, good for Heroku (default: false).

config/puma.rb

@@ -4,12 +4,13 @@
 # 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.
 #
-threads_count = ENV.fetch("RAILS_MAX_THREADS") { 5 }.to_i
-threads threads_count, threads_count
+max_threads_count = ENV.fetch("RAILS_MAX_THREADS") { 5 }
+min_threads_count = ENV.fetch("RAILS_MIN_THREADS") { max_threads_count }
+threads min_threads_count, max_threads_count
 
 # 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.
 #