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Disable wal_autocheckpoint and run PASSIVE checkpoints from one elected writer process. Contenders start in console/rake (initializer), Puma workers (including WEB_CONCURRENCY=auto), and Resque children, with failover, capped error backoff, and tests for lock takeover. Co-authored-by: Thomas Klemm <github@tklemm.eu>
72 lines
2.6 KiB
Ruby
72 lines
2.6 KiB
Ruby
require File.expand_path("../config/environment", File.dirname(__FILE__))
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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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max_threads_count = ENV.fetch("RAILS_MAX_THREADS") { 5 }
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min_threads_count = ENV.fetch("RAILS_MIN_THREADS") { max_threads_count }
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threads min_threads_count, max_threads_count
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# Specifies the `worker_timeout` threshold that Puma will use to wait before
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# terminating a worker in development environments.
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#
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worker_timeout 3600 if ENV.fetch("RAILS_ENV", "development") == "development"
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# Bind http listener.
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PORT=ENV.fetch("PORT", 3000)
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bind "tcp://0.0.0.0:#{PORT}"
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# Specifies the `environment` that Puma will run in.
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#
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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") { "tmp/pids/server.pid" }
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# Specifies the number of `workers` to boot in clustered mode.
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# Workers are forked web server 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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#
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worker_count = (Concurrent.processor_count * 0.666).ceil
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# Keep the raw setting: WEB_CONCURRENCY=auto must not be coerced with to_i (that
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# is 0 and would look like single-process mode while Puma still forks workers).
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configured_workers = ENV.fetch("WEB_CONCURRENCY") { worker_count }
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workers configured_workers
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ENV["JOB_CONCURRENCY"] ||= worker_count.to_s
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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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#
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# preload_app!
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# Allow puma to be restarted by `bin/rails restart` command.
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plugin :tmp_restart
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# Reset all membership connections
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Membership.disconnect_all
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# Only the literal 0 is single-process. "auto" and positive counts fork workers;
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# those must start the checkpointer after boot so a surviving worker can take
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# the lock if the previous leader exits.
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if SqliteWalCheckpoint.single_puma_process?(configured_workers)
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SqliteWalCheckpoint.start
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else
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on_worker_boot { SqliteWalCheckpoint.start }
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end
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Signal.trap :SIGPROF do
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Thread.list.each do |t|
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puts t
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puts t.backtrace
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puts
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end
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end
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