puma config example

config/puma.rb.example

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+# Puma can serve each request in a thread from an internal thread pool.
+# The `threads` method setting takes two numbers: a minimum and maximum.
+# 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
+# and maximum; this matches the default thread size of Active Record.
+#
+threads_count = ENV.fetch("RAILS_MAX_THREADS") { 8 }
+threads threads_count, threads_count * 2
+
+# Specifies the `port` that Puma will listen on to receive requests; default is 3000.
+#
+port        ENV.fetch("PORT") { 4000 }
+
+# Specifies the `environment` that Puma will run in.
+#
+environment ENV.fetch("RAILS_ENV") { "development" }
+
+# Specifies the number of `workers` to boot in clustered mode.
+# Workers are forked webserver processes. If using threads and workers together
+# the concurrency of the application would be max `threads` * `workers`.
+# Workers do not work on JRuby or Windows (both of which do not support
+# processes).
+#
+# workers ENV.fetch("WEB_CONCURRENCY") { 8 }
+
+# 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
+# process behavior so workers use less memory.
+#
+# preload_app!
+
+
+before_fork do
+  require 'puma_worker_killer'
+  PumaWorkerKiller.config do |config|
+    config.ram           = 2048 # mb
+    config.frequency     = 20    # seconds
+    config.percent_usage = 0.98
+    #config.rolling_restart_frequency = 12 * 3600 # 12 hours in seconds, or 12.hours if using Rails
+  end
+
+  PumaWorkerKiller.start
+end
+
+# Allow puma to be restarted by `rails restart` command.
+plugin :tmp_restart