Class: Appsignal::GarbageCollection::Profiler

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

Overview

A wrapper around Ruby’s ‘GC::Profiler` that tracks garbage collection time, while clearing `GC::Profiler`’s total_time to make sure it doesn’t leak memory by keeping garbage collection run samples in memory.

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Profiler

Returns a new instance of Profiler.



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# File 'lib/appsignal/garbage_collection.rb', line 46

def initialize
  @total_time = 0
end

Class Method Details

.lock ⇒ Object 



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# File 'lib/appsignal/garbage_collection.rb', line 42

def self.lock
  @lock ||= Mutex.new
end

Instance Method Details

#total_time ⇒ Integer

Whenever #total_time is called, the current ‘GC::Profiler#total_time` gets added to `@total_time`, after which `GC::Profiler.clear` is called to prevent it from leaking memory. A class-level lock is used to make sure garbage collection time is never counted more than once.

Whenever ‘@total_time` gets above two billion milliseconds (about 23 days), it’s reset to make sure the result fits in a signed 32-bit integer.

Returns:

  • (Integer) 


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# File 'lib/appsignal/garbage_collection.rb', line 60

def total_time
  lock.synchronize do
    @total_time += (internal_profiler.total_time * 1000).round
    internal_profiler.clear
  end

  @total_time = 0 if @total_time > 2_000_000_000

  @total_time
end