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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: 850, puma_master_max_memory_mb: 550)
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
config.ram = puma_master_max_memory_mb + (worker_count * puma_per_worker_max_memory_mb)
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.
observer = Gitlab::Cluster::PumaWorkerKillerObserver.new
config.pre_term = observer.callback
end
PumaWorkerKiller.start
end
end
end
end
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