module Gitlab module SidekiqMiddleware class MemoryKiller # Default the RSS limit to 0, meaning the MemoryKiller is disabled MAX_RSS = (ENV['SIDEKIQ_MEMORY_KILLER_MAX_RSS'] || 0).to_s.to_i # Give Sidekiq 15 minutes of grace time after exceeding the RSS limit GRACE_TIME = (ENV['SIDEKIQ_MEMORY_KILLER_GRACE_TIME'] || 15 * 60).to_s.to_i # Wait 30 seconds for running jobs to finish during graceful shutdown SHUTDOWN_WAIT = (ENV['SIDEKIQ_MEMORY_KILLER_SHUTDOWN_WAIT'] || 30).to_s.to_i # Create a mutex used to ensure there will be only one thread waiting to # shut Sidekiq down MUTEX = Mutex.new def call(worker, job, queue) yield current_rss = get_rss return unless MAX_RSS > 0 && current_rss > MAX_RSS Thread.new do # Return if another thread is already waiting to shut Sidekiq down return unless MUTEX.try_lock Sidekiq.logger.warn "current RSS #{current_rss} exceeds maximum RSS "\ "#{MAX_RSS}" Sidekiq.logger.warn "spawned thread that will shut down PID "\ "#{Process.pid} in #{GRACE_TIME} seconds" sleep(GRACE_TIME) Sidekiq.logger.warn "sending SIGUSR1 to PID #{Process.pid}" Process.kill('SIGUSR1', Process.pid) Sidekiq.logger.warn "waiting #{SHUTDOWN_WAIT} seconds before sending "\ "SIGTERM to PID #{Process.pid}" sleep(SHUTDOWN_WAIT) Sidekiq.logger.warn "sending SIGTERM to PID #{Process.pid}" Process.kill('SIGTERM', Process.pid) end end private def get_rss output, status = Gitlab::Popen.popen(%W(ps -o rss= -p #{Process.pid})) return 0 unless status.zero? output.to_i end end end end