malloc.png

msgpack-buffer-xmalloc.rb

require 'msgpack'

sleep 10
array = ["abc" * 1024] * 100
100000.times do
  packer = MessagePack::Packer.new
  packer.write(array)
end

require 'pp'
pp GC.stat
#=> with malloc
# {:count=>30,
#  :heap_allocated_pages=>236,
#  :heap_sorted_length=>237,
#  :heap_allocatable_pages=>10,
#  :heap_available_slots=>96200,
#  :heap_live_slots=>88281,
#  :heap_free_slots=>7919,
#  :heap_final_slots=>0,
#  :heap_marked_slots=>46495,
#  :heap_swept_slots=>52255,
#  :heap_eden_pages=>226,
#  :heap_tomb_pages=>10,
#  :total_allocated_pages=>236,
#  :total_freed_pages=>0,
#  :total_allocated_objects=>762810,
#  :total_freed_objects=>674529,
#  :malloc_increase_bytes=>1715472,
#  :malloc_increase_bytes_limit=>16777216,
#  :minor_gc_count=>24,
#  :major_gc_count=>6,
#  :remembered_wb_unprotected_objects=>509,
#  :remembered_wb_unprotected_objects_limit=>1004,
#  :old_objects=>43778,
#  :old_objects_limit=>78918,
#  :oldmalloc_increase_bytes=>20050864,
#  :oldmalloc_increase_bytes_limit=>20132659}

#=> with xmalloc
# {:count=>527,
#  :heap_allocated_pages=>189,
#  :heap_sorted_length=>237,
#  :heap_allocatable_pages=>0,
#  :heap_available_slots=>77035,
#  :heap_live_slots=>49711,
#  :heap_free_slots=>27324,
#  :heap_final_slots=>0,
#  :heap_marked_slots=>43878,
#  :heap_swept_slots=>6687,
#  :heap_eden_pages=>188,
#  :heap_tomb_pages=>1,
#  :total_allocated_pages=>189,
#  :total_freed_pages=>0,
#  :total_allocated_objects=>762925,
#  :total_freed_objects=>713214,
#  :malloc_increase_bytes=>23763088,
#  :malloc_increase_bytes_limit=>33554432,
#  :minor_gc_count=>512,
#  :major_gc_count=>15,
#  :remembered_wb_unprotected_objects=>504,
#  :remembered_wb_unprotected_objects_limit=>1008,
#  :old_objects=>43345,
#  :old_objects_limit=>86692,
#  :oldmalloc_increase_bytes=>54150112,
#  :oldmalloc_increase_bytes_limit=>88660647}

profile.sh

while true; do
    ps -p $1 -o vsz=,%cpu= >> prof5.log
    sleep 1
done

xmalloc.png