gistfile1.txt

require 'benchmark'

puts Benchmark.measure {
    a = []
    5000000.times { a << []} # use up some RAM
    3000000.times {[]}
}


-O0:
  normal: 12.8s

    Total: 1097 samples
     257  23.4%  23.4%      341  31.1% _gc_sweep
     251  22.9%  46.3%      379  34.5% _gc_mark_children
     205  18.7%  65.0%      205  18.7% _rb_ary_store
     111  10.1%  75.1%      393  35.8% _gc_mark
      50   4.6%  79.7%       50   4.6% _rb_special_const_p
      35   3.2%  82.9%       35   3.2% _szone_free_definite_size
      31   2.8%  85.7%       31   2.8% _add_heap
      24   2.2%  87.9%       24   2.2% __setjmp
      20   1.8%  89.7%       20   1.8% _add_freelist
      20   1.8%  91.5%       20   1.8% _tiny_malloc_from_free_list

  threaded: 13.1s

    Total: 1119 samples
     328  29.3%  29.3%      328  29.3% _semaphore_wait_trap
     223  19.9%  49.2%      325  29.0% _gc_mark_children
     176  15.7%  65.0%      177  15.8% _rb_ary_store
      97   8.7%  73.6%      346  30.9% _gc_mark
      46   4.1%  77.7%       46   4.1% _semaphore_wait_signal_trap
      43   3.8%  81.6%       43   3.8% _tiny_malloc_from_free_list
      38   3.4%  85.0%       38   3.4% _rb_special_const_p
      33   2.9%  87.9%       33   2.9% ___mmap
      31   2.8%  90.7%       31   2.8% _add_heap
      23   2.1%  92.8%       23   2.1% _gc_sweep_heaps

-O2:
  normal: 9.2s

    Total: 809 samples
     301  37.2%  37.2%      583  72.1% _garbage_collect
     131  16.2%  53.4%      131  16.2% _rb_ary_store
     109  13.5%  66.9%      218  26.9% _gc_mark_children
     108  13.3%  80.2%      108  13.3% _gc_mark
      29   3.6%  83.8%       29   3.6% _szone_free_definite_size
      27   3.3%  87.1%       28   3.5% _add_heap
      20   2.5%  89.6%       20   2.5% _tiny_malloc_from_free_list
      18   2.2%  91.8%       18   2.2% __setjmp
      14   1.7%  93.6%       14   1.7% ___mmap
       8   1.0%  94.6%      601  74.3% _rb_eval

  threaded: 9.5s

    Total: 874 samples
     310  35.5%  35.5%      310  35.5% _semaphore_wait_trap
     145  16.6%  52.1%      145  16.6% _rb_ary_store
     122  14.0%  66.0%      228  26.1% _gc_mark_children
     104  11.9%  77.9%      104  11.9% _gc_mark
      44   5.0%  83.0%       44   5.0% _semaphore_wait_signal_trap
      29   3.3%  86.3%       29   3.3% _add_heap
      25   2.9%  89.1%       25   2.9% _gc_sweep_heaps
      20   2.3%  91.4%       20   2.3% _tiny_malloc_from_free_list
      14   1.6%  93.0%       14   1.6% ___mmap
      12   1.4%  94.4%      753  86.2% _rb_eval