DEV-517: Puma tuning

config/puma.rb

@@ -4,8 +4,9 @@
 # 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('PUMA_THREADS', 5).to_i
-threads threads_count, threads_count
+min_threads = ENV.fetch('MIN_THREADS', 1).to_i
+max_threads = ENV.fetch('RAILS_MAX_THREADS', 5).to_i
+threads min_threads, max_threads
 
 # Specifies the `worker_timeout` threshold that Puma will use to wait before
 # terminating a worker in development environments.
@@ -27,6 +28,10 @@
 # processes).
 workers ENV.fetch('PUMA_WORKERS', 2).to_i
 
+# Tells puma to try to route requests to workers having less load.
+# This is on by default in Puma v6.0+.
+wait_for_less_busy_worker
+
 # Use the `preload_app!` method when specifying a `workers` number.
 # This directive tells Puma to first boot the application and load code
 # before forking the application. This takes advantage of Copy On Write