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Contents
# frozen_string_literal: true
module Appsignal
# {Appsignal::GarbageCollectionProfiler} wraps Ruby's `GC::Profiler` to be
# able to track garbage collection time for multiple transactions, while
# constantly clearing `GC::Profiler`'s total_time to make sure it doesn't
# leak memory by keeping garbage collection run samples in memory.
#
# @api private
class GarbageCollectionProfiler
def self.lock
@lock ||= Mutex.new
end
def initialize
@total_time = 0
end
# 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.
#
# @return [Integer]
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
private
def internal_profiler
GC::Profiler
end
def lock
self.class.lock
end
end
# {Appsignal::NilGarbageCollectionProfiler} is a dummy profiler
# that always returns 0 as the total time.
# Used when we don't want any profile information
#
# @api private
class NilGarbageCollectionProfiler
def total_time
0
end
end
end
Version data entries
210 entries across 210 versions & 1 rubygems