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# frozen_string_literal: true
module Gitlab
module Cluster
class PumaWorkerKillerInitializer
def self.start(
puma_options,
puma_per_worker_max_memory_mb: 1024,
puma_master_max_memory_mb: 800,
additional_puma_dev_max_memory_mb: 200
)
require 'puma_worker_killer'
PumaWorkerKiller.config do |config|
# Note! ram is expressed in megabytes (whereas GITLAB_UNICORN_MEMORY_MAX is in bytes)
# Importantly RAM is for _all_workers (ie, the cluster),
# not each worker as is the case with GITLAB_UNICORN_MEMORY_MAX
worker_count = puma_options[:workers] || 1
# The Puma Worker Killer checks the total RAM used by both the master
# and worker processes.
# https://github.com/schneems/puma_worker_killer/blob/v0.1.0/lib/puma_worker_killer/puma_memory.rb#L57
#
# Additional memory is added when running in `development`
config.ram = puma_master_max_memory_mb +
(worker_count * puma_per_worker_max_memory_mb) +
(Rails.env.development? ? (1 + worker_count) * additional_puma_dev_max_memory_mb : 0)
config.frequency = 20 # seconds
# We just want to limit to a fixed maximum, unrelated to the total amount
# of available RAM.
config.percent_usage = 0.98
# Ideally we'll never hit the maximum amount of memory. Restart the workers
# regularly rather than rely on OOM behavior for periodic restarting.
config.rolling_restart_frequency = 43200 # 12 hours in seconds.
# Spread the rolling restarts out over 1 hour to avoid too many simultaneous
# process startups.
config.rolling_restart_splay_seconds = 0.0..3600.0 # 0 to 1 hour in seconds.
observer = Gitlab::Cluster::PumaWorkerKillerObserver.new
config.pre_term = observer.callback
end
PumaWorkerKiller.start
end
end
end
end
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