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Contents
# typed: true
module Datadog
module Core
module Environment
# Reports Ruby VM cache performance statistics.
# This currently encompasses cache invalidation counters and is CRuby-specific.
#
# JRuby emulates some CRuby global cache statistics, but they are synthetic and don't
# provide actionable performance information in the same way CRuby does.
# @see https://github.com/jruby/jruby/issues/4384#issuecomment-267069314
#
# TruffleRuby does not have a global runtime cache invalidation cache.
# @see http://archive.today/2021.09.10-205702/https://medium.com/graalvm/precise-method-and-constant-invalidation-in-truffleruby-4dd56c6bac1a
module VMCache
module_function
# Global constant cache "generation" counter.
#
# Whenever a constant creation busts the global constant cache
# this value is incremented. This has a measurable performance impact
# and thus show be avoided after application warm up.
def global_constant_state
::RubyVM.stat[:global_constant_state]
end
# Global method cache "generation" counter.
#
# Whenever a method creation busts the global method cache
# this value is incremented. This has a measurable performance impact
# and thus show be avoided after application warm up.
#
# Since Ruby 3.0, the method class is kept on a per-class basis,
# largely mitigating global method cache busting. `global_method_state`
# is thus not available since Ruby 3.0.
# @see https://bugs.ruby-lang.org/issues/16614
def global_method_state
::RubyVM.stat[:global_method_state]
end
def available?
defined?(::RubyVM) && ::RubyVM.respond_to?(:stat)
end
end
end
end
end
Version data entries
16 entries across 16 versions & 1 rubygems