307 lines
10 KiB
Ruby
307 lines
10 KiB
Ruby
# for gc.c
|
|
|
|
# The GC module provides an interface to Ruby's mark and
|
|
# sweep garbage collection mechanism.
|
|
#
|
|
# Some of the underlying methods are also available via the ObjectSpace
|
|
# module.
|
|
#
|
|
# You may obtain information about the operation of the GC through
|
|
# GC::Profiler.
|
|
module GC
|
|
|
|
# call-seq:
|
|
# GC.start -> nil
|
|
# ObjectSpace.garbage_collect -> nil
|
|
# include GC; garbage_collect -> nil
|
|
# GC.start(full_mark: true, immediate_sweep: true) -> nil
|
|
# ObjectSpace.garbage_collect(full_mark: true, immediate_sweep: true) -> nil
|
|
# include GC; garbage_collect(full_mark: true, immediate_sweep: true) -> nil
|
|
#
|
|
# Initiates garbage collection, even if manually disabled.
|
|
#
|
|
# This method is defined with keyword arguments that default to true:
|
|
#
|
|
# def GC.start(full_mark: true, immediate_sweep: true); end
|
|
#
|
|
# Use full_mark: false to perform a minor GC.
|
|
# Use immediate_sweep: false to defer sweeping (use lazy sweep).
|
|
#
|
|
# Note: These keyword arguments are implementation and version dependent. They
|
|
# are not guaranteed to be future-compatible, and may be ignored if the
|
|
# underlying implementation does not support them.
|
|
def self.start full_mark: true, immediate_mark: true, immediate_sweep: true
|
|
Primitive.gc_start_internal full_mark, immediate_mark, immediate_sweep, false
|
|
end
|
|
|
|
def garbage_collect full_mark: true, immediate_mark: true, immediate_sweep: true
|
|
Primitive.gc_start_internal full_mark, immediate_mark, immediate_sweep, false
|
|
end
|
|
|
|
# call-seq:
|
|
# GC.enable -> true or false
|
|
#
|
|
# Enables garbage collection, returning +true+ if garbage
|
|
# collection was previously disabled.
|
|
#
|
|
# GC.disable #=> false
|
|
# GC.enable #=> true
|
|
# GC.enable #=> false
|
|
#
|
|
def self.enable
|
|
Primitive.gc_enable
|
|
end
|
|
|
|
# call-seq:
|
|
# GC.disable -> true or false
|
|
#
|
|
# Disables garbage collection, returning +true+ if garbage
|
|
# collection was already disabled.
|
|
#
|
|
# GC.disable #=> false
|
|
# GC.disable #=> true
|
|
def self.disable
|
|
Primitive.gc_disable
|
|
end
|
|
|
|
# call-seq:
|
|
# GC.stress -> integer, true or false
|
|
#
|
|
# Returns current status of GC stress mode.
|
|
def self.stress
|
|
Primitive.gc_stress_get
|
|
end
|
|
|
|
# call-seq:
|
|
# GC.stress = flag -> flag
|
|
#
|
|
# Updates the GC stress mode.
|
|
#
|
|
# When stress mode is enabled, the GC is invoked at every GC opportunity:
|
|
# all memory and object allocations.
|
|
#
|
|
# Enabling stress mode will degrade performance, it is only for debugging.
|
|
#
|
|
# flag can be true, false, or an integer bit-ORed following flags.
|
|
# 0x01:: no major GC
|
|
# 0x02:: no immediate sweep
|
|
# 0x04:: full mark after malloc/calloc/realloc
|
|
def self.stress=(flag)
|
|
Primitive.gc_stress_set_m flag
|
|
end
|
|
|
|
# call-seq:
|
|
# GC.count -> Integer
|
|
#
|
|
# The number of times GC occurred.
|
|
#
|
|
# It returns the number of times GC occurred since the process started.
|
|
def self.count
|
|
Primitive.gc_count
|
|
end
|
|
|
|
# call-seq:
|
|
# GC.stat -> Hash
|
|
# GC.stat(hash) -> Hash
|
|
# GC.stat(:key) -> Numeric
|
|
#
|
|
# Returns a Hash containing information about the GC.
|
|
#
|
|
# The contents of the hash are implementation specific and may change in
|
|
# the future without notice.
|
|
#
|
|
# The hash includes information about internal statistics about GC such as:
|
|
#
|
|
# [count]
|
|
# The total number of garbage collections ran since application start
|
|
# (count includes both minor and major garbage collections)
|
|
# [time]
|
|
# The total time spent in garbage collections (in milliseconds)
|
|
# [heap_allocated_pages]
|
|
# The total number of `:heap_eden_pages` + `:heap_tomb_pages`
|
|
# [heap_sorted_length]
|
|
# The number of pages that can fit into the buffer that holds references to
|
|
# all pages
|
|
# [heap_allocatable_pages]
|
|
# The total number of pages the application could allocate without additional GC
|
|
# [heap_available_slots]
|
|
# The total number of slots in all `:heap_allocated_pages`
|
|
# [heap_live_slots]
|
|
# The total number of slots which contain live objects
|
|
# [heap_free_slots]
|
|
# The total number of slots which do not contain live objects
|
|
# [heap_final_slots]
|
|
# The total number of slots with pending finalizers to be run
|
|
# [heap_marked_slots]
|
|
# The total number of objects marked in the last GC
|
|
# [heap_eden_pages]
|
|
# The total number of pages which contain at least one live slot
|
|
# [heap_tomb_pages]
|
|
# The total number of pages which do not contain any live slots
|
|
# [total_allocated_pages]
|
|
# The cumulative number of pages allocated since application start
|
|
# [total_freed_pages]
|
|
# The cumulative number of pages freed since application start
|
|
# [total_allocated_objects]
|
|
# The cumulative number of objects allocated since application start
|
|
# [total_freed_objects]
|
|
# The cumulative number of objects freed since application start
|
|
# [malloc_increase_bytes]
|
|
# Amount of memory allocated on the heap for objects. Decreased by any GC
|
|
# [malloc_increase_bytes_limit]
|
|
# When `:malloc_increase_bytes` crosses this limit, GC is triggered
|
|
# [minor_gc_count]
|
|
# The total number of minor garbage collections run since process start
|
|
# [major_gc_count]
|
|
# The total number of major garbage collections run since process start
|
|
# [compact_count]
|
|
# The total number of compactions run since process start
|
|
# [read_barrier_faults]
|
|
# The total number of times the read barrier was triggered during
|
|
# compaction
|
|
# [total_moved_objects]
|
|
# The total number of objects compaction has moved
|
|
# [remembered_wb_unprotected_objects]
|
|
# The total number of objects without write barriers
|
|
# [remembered_wb_unprotected_objects_limit]
|
|
# When `:remembered_wb_unprotected_objects` crosses this limit,
|
|
# major GC is triggered
|
|
# [old_objects]
|
|
# Number of live, old objects which have survived at least 3 garbage collections
|
|
# [old_objects_limit]
|
|
# When `:old_objects` crosses this limit, major GC is triggered
|
|
# [oldmalloc_increase_bytes]
|
|
# Amount of memory allocated on the heap for objects. Decreased by major GC
|
|
# [oldmalloc_increase_bytes_limit]
|
|
# When `:old_malloc_increase_bytes` crosses this limit, major GC is triggered
|
|
#
|
|
# If the optional argument, hash, is given,
|
|
# it is overwritten and returned.
|
|
# This is intended to avoid probe effect.
|
|
#
|
|
# This method is only expected to work on CRuby.
|
|
def self.stat hash_or_key = nil
|
|
Primitive.gc_stat hash_or_key
|
|
end
|
|
|
|
# call-seq:
|
|
# GC.stat_heap -> Hash
|
|
# GC.stat_heap(nil, hash) -> Hash
|
|
# GC.stat_heap(heap_name) -> Hash
|
|
# GC.stat_heap(heap_name, hash) -> Hash
|
|
# GC.stat_heap(heap_name, :key) -> Numeric
|
|
#
|
|
# Returns information for memory pools in the GC.
|
|
#
|
|
# If the first optional argument, +heap_name+, is passed in and not +nil+, it
|
|
# returns a +Hash+ containing information about the particular memory pool.
|
|
# Otherwise, it will return a +Hash+ with memory pool names as keys and
|
|
# a +Hash+ containing information about the memory pool as values.
|
|
#
|
|
# If the second optional argument, +hash_or_key+, is given as +Hash+, it will
|
|
# be overwritten and returned. This is intended to avoid the probe effect.
|
|
#
|
|
# If both optional arguments are passed in and the second optional argument is
|
|
# a symbol, it will return a +Numeric+ of the value for the particular memory
|
|
# pool.
|
|
#
|
|
# On CRuby, +heap_name+ is of the type +Integer+ but may be of type +String+
|
|
# on other implementations.
|
|
#
|
|
# The contents of the hash are implementation specific and may change in
|
|
# the future without notice.
|
|
#
|
|
# If the optional argument, hash, is given, it is overwritten and returned.
|
|
#
|
|
# This method is only expected to work on CRuby.
|
|
def self.stat_heap heap_name = nil, hash_or_key = nil
|
|
Primitive.gc_stat_heap heap_name, hash_or_key
|
|
end
|
|
|
|
# call-seq:
|
|
# GC.latest_gc_info -> {:gc_by=>:newobj}
|
|
# GC.latest_gc_info(hash) -> hash
|
|
# GC.latest_gc_info(:major_by) -> :malloc
|
|
#
|
|
# Returns information about the most recent garbage collection.
|
|
#
|
|
# If the optional argument, hash, is given,
|
|
# it is overwritten and returned.
|
|
# This is intended to avoid probe effect.
|
|
def self.latest_gc_info hash_or_key = nil
|
|
Primitive.gc_latest_gc_info hash_or_key
|
|
end
|
|
|
|
if respond_to?(:compact)
|
|
# call-seq:
|
|
# GC.verify_compaction_references(toward: nil, double_heap: false) -> hash
|
|
#
|
|
# Verify compaction reference consistency.
|
|
#
|
|
# This method is implementation specific. During compaction, objects that
|
|
# were moved are replaced with T_MOVED objects. No object should have a
|
|
# reference to a T_MOVED object after compaction.
|
|
#
|
|
# This function expands the heap to ensure room to move all objects,
|
|
# compacts the heap to make sure everything moves, updates all references,
|
|
# then performs a full GC. If any object contains a reference to a T_MOVED
|
|
# object, that object should be pushed on the mark stack, and will
|
|
# make a SEGV.
|
|
def self.verify_compaction_references(toward: nil, double_heap: false, expand_heap: false)
|
|
Primitive.gc_verify_compaction_references(double_heap, expand_heap, toward == :empty)
|
|
end
|
|
end
|
|
|
|
# call-seq:
|
|
# GC.using_rvargc? -> true or false
|
|
#
|
|
# Returns true if using experimental feature Variable Width Allocation, false
|
|
# otherwise.
|
|
def self.using_rvargc? # :nodoc:
|
|
GC::INTERNAL_CONSTANTS[:SIZE_POOL_COUNT] > 1
|
|
end
|
|
|
|
|
|
# call-seq:
|
|
# GC.measure_total_time = true/false
|
|
#
|
|
# Enable to measure GC time.
|
|
# You can get the result with <tt>GC.stat(:time)</tt>.
|
|
# Note that GC time measurement can cause some performance overhead.
|
|
def self.measure_total_time=(flag)
|
|
Primitive.cstmt! %{
|
|
rb_objspace.flags.measure_gc = RTEST(flag) ? TRUE : FALSE;
|
|
return flag;
|
|
}
|
|
end
|
|
|
|
# call-seq:
|
|
# GC.measure_total_time -> true/false
|
|
#
|
|
# Return measure_total_time flag (default: +true+).
|
|
# Note that measurement can affect the application performance.
|
|
def self.measure_total_time
|
|
Primitive.cexpr! %{
|
|
RBOOL(rb_objspace.flags.measure_gc)
|
|
}
|
|
end
|
|
|
|
# call-seq:
|
|
# GC.total_time -> int
|
|
#
|
|
# Return measured GC total time in nano seconds.
|
|
def self.total_time
|
|
Primitive.cexpr! %{
|
|
ULL2NUM(rb_objspace.profile.total_time_ns)
|
|
}
|
|
end
|
|
end
|
|
|
|
module ObjectSpace
|
|
def garbage_collect full_mark: true, immediate_mark: true, immediate_sweep: true
|
|
Primitive.gc_start_internal full_mark, immediate_mark, immediate_sweep, false
|
|
end
|
|
|
|
module_function :garbage_collect
|
|
end
|