Class: UnicornWrangler::OutOfBandGC

Inherits:
Object
  • Object
show all
Defined in:
lib/unicorn_wrangler.rb

Overview

Do not run GC inside of requests, but only after a certain time spent in requests

Alternative: github.com/tmm1/gctools which is more sophisticated and will result in less time spent GCing and less overall memory needed

Instance Method Summary collapse

Constructor Details

#initialize(logger, stats, max_request_time) ⇒ OutOfBandGC

Returns a new instance of OutOfBandGC.



183
184
185
186
187
188
189
 
# File 'lib/unicorn_wrangler.rb', line 183

def initialize(logger, stats, max_request_time)
  @logger = logger
  @stats = stats
  @max_request_time = max_request_time
  @logger.info "Garbage collecting after #{@max_request_time}s of request processing time"
  @gc_ran_at = 0
end

Instance Method Details

#call(_requests, request_time) ⇒ Object 



191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
 
# File 'lib/unicorn_wrangler.rb', line 191

def call(_requests, request_time)
  time_since_last_gc = request_time - @gc_ran_at
  return unless time_since_last_gc >= @max_request_time
  @gc_ran_at = request_time

  time = Benchmark.realtime do
    GC.enable
    GC.start
    GC.disable
  end

  time = (time * 1000).round # s -> ms
  if @stats
    @stats.increment("#{STATS_NAMESPACE}.oobgc.runs")
    @stats.timing("#{STATS_NAMESPACE}.oobgc.time", time)
  end
  @logger.debug "Garbage collecting: took #{time}ms"
  true
end