70 lines
2.9 KiB
Ruby
70 lines
2.9 KiB
Ruby
# typed: false
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require "etc"
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# Puma can serve each request in a thread from an internal thread pool.
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# The `threads` method setting takes two numbers: a minimum and maximum.
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# Any libraries that use thread pools should be configured to match
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# the maximum value specified for Puma. Default is set to 5 threads for minimum
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# and maximum; this matches the default thread size of Active Record.
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#
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threads_count = ENV.fetch("RAILS_MAX_THREADS") { 5 }
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threads threads_count, threads_count
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# Specifies the `port` that Puma will listen on to receive requests; default is 3000.
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# port ENV.fetch("PORT") { 3000 }
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# bind 'tcp://127.0.0.1:3000'
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# Specifies the `environment` that Puma will run in.
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environment ENV.fetch("RAILS_ENV") { "development" }
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# Specifies the `pidfile` that Puma will use.
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pidfile ENV.fetch("PIDFILE") {
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if ENV.fetch("RAILS_ENV") == "production"
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"/srv/lobste.rs/run/puma.pid"
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else
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"tmp/puma.pid"
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end
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}
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# Specifies the number of `workers` to boot in clustered mode.
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# Workers are forked webserver processes. If using threads and workers together
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# the concurrency of the application would be max `threads` * `workers`.
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# Workers do not work on JRuby or Windows (both of which do not support
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# processes).
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workers ENV.fetch("PUMA_WORKERS") { 4 }
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# In prod we run dozens of workers on a 4 core cpu. Puma starts all of them at
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# the same time, pinning the CPU until the box is unresponsive. Where one
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# worker takes 5-6.5s to start, starting 30 at the same time takes 90s for any
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# to start so we throw a lot of 502s. This hook runs before the app boots and
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# sleeps a variable period to give other workers a chance to start.
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worker_boot_duration = 7 # seconds, conservatively
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# workers are numbered from zero, so:
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# (0..11).map {|i| (i / 3.0).floor } => [0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 3]
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def sleep_for_index index, worker_boot_duration
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workers_to_start_at_a_time = Etc.nprocessors - 1 # leave one open for serving
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(index / workers_to_start_at_a_time.to_f).floor * worker_boot_duration
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end
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last_index = (ENV.fetch("PUMA_WORKERS") { 4 }).to_i - 1
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worker_boot_timeout sleep_for_index(last_index, worker_boot_duration) + worker_boot_duration * 3
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on_worker_boot { |index| sleep sleep_for_index(index, worker_boot_duration) }
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# Use the `preload_app!` method when specifying a `workers` number.
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# This directive tells Puma to first boot the application and load code
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# before forking the application. This takes advantage of Copy On Write
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# process behavior so workers use less memory.
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if ENV.fetch("RAILS_ENV") == "production"
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bind "unix:///srv/lobsters/lobsters/run/puma.sock"
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# phased restarts
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# https://github.com/puma/puma/blob/master/docs/restart.md
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prune_bundler
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# old hot restart config; will need ansible change to tell systemctl to restart instead of reload
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# preload_app!
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end
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# Allow puma to be restarted by `rails restart` command.
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plugin :tmp_restart
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