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Contents
# This file is distributed under New Relic's license terms.
# See https://github.com/newrelic/newrelic-ruby-agent/blob/main/LICENSE for complete details.
# frozen_string_literal: true
# The GC::Profiler class available on MRI has to be reset periodically to avoid
# memory "leaking" in the underlying implementation. However, it's a major
# bummer for how we want to gather those statistics.
#
# This class comes to the rescue. It relies on being the only party to reset
# the underlying GC::Profiler, but otherwise gives us a steadily increasing
# total time.
module NewRelic
module Agent
module VM
class MonotonicGCProfiler
def initialize
@total_time_s = 0
@lock = Mutex.new
end
def total_time_s
if NewRelic::LanguageSupport.gc_profiler_enabled?
# There's a race here if the next two lines don't execute as an atomic
# unit - we may end up double-counting some GC time in that scenario.
# Locking around them guarantees atomicity of the read/increment/reset
# sequence.
@lock.synchronize do
# The Ruby 1.9.x docs claim that GC::Profiler.total_time returns
# a value in milliseconds. They are incorrect - both 1.9.x and 2.x
# return values in seconds.
@total_time_s += ::GC::Profiler.total_time
::GC::Profiler.clear
end
else
NewRelic::Agent.logger.log_once(:warn, :gc_profiler_disabled,
"Tried to measure GC time, but GC::Profiler was not enabled.")
end
@total_time_s
end
end
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems