├── README.md
└── memory_freeze_benchmark.rb


/README.md:
--------------------------------------------------------------------------------
 1 | # Understand ruby memory usage 🤔
 2 | 
 3 | I initially made this post to add questions I have about ruby memory (in MRI). Understanding how ruby use memory is not an easy path. I'm passionate about this subject.
 4 | 
 5 | This projet is now a wiki. Feel free to contribute. 🙌
 6 | 
 7 | It is still updated (2023)
 8 | 
 9 | https://github.com/benoittgt/understand_ruby_memory/wiki
10 | 


--------------------------------------------------------------------------------
/memory_freeze_benchmark.rb:
--------------------------------------------------------------------------------
 1 | require 'memory_profiler'
 2 | 
 3 | report_1 = MemoryProfiler.report do
 4 |   def get_me_directly
 5 |     File.read('1.txt')
 6 |   end
 7 |   100.times { get_me_directly }
 8 | end
 9 | 
10 | report_2 = MemoryProfiler.report do
11 |   ST = File.read('2.txt')
12 |   def get_me_with_constant
13 |     ST
14 |   end
15 |   100.times { get_me_with_constant }
16 | end
17 | 
18 | report_3 = MemoryProfiler.report do
19 |   ST_FREEZE = File.read('3.txt').freeze
20 |   def get_me_with_constant_freeze
21 |     ST_FREEZE
22 |   end
23 |   100.times { get_me_with_constant_freeze }
24 | end
25 | 
26 | puts ' With get_me_directly '.center(50, '✨')
27 | report_1.pretty_print
28 | # Allocated String Report
29 | # -----------------------------------
30 | #        200  "1.txt"
31 | #        200  memory_freeze_benchmark.rb:5
32 | #
33 | #        100  ""
34 | #        100  memory_freeze_benchmark.rb:5
35 | #
36 | #
37 | # Retained String Report
38 | # -----------------------------------
39 | 
40 | puts "\n"
41 | puts ' With get_me_with_constant '.center(50, '✨')
42 | report_2.pretty_print
43 | # Allocated String Report
44 | # -----------------------------------
45 | #          2  "2.txt"
46 | #          2  memory_freeze_benchmark.rb:11
47 | #
48 | #          1  ""
49 | #          1  memory_freeze_benchmark.rb:11
50 | #
51 | #
52 | # Retained String Report
53 | # -----------------------------------
54 | #          1  ""
55 | #          1  memory_freeze_benchmark.rb:11
56 | 
57 | puts "\n"
58 | puts ' With get_me_with_constant_freeze '.center(50, '✨')
59 | report_3.pretty_print
60 | # Allocated String Report
61 | # -----------------------------------
62 | #          2  "3.txt"
63 | #          2  memory_freeze_benchmark.rb:19
64 | #
65 | #          1  ""
66 | #          1  memory_freeze_benchmark.rb:19
67 | #
68 | #
69 | # Retained String Report
70 | # -----------------------------------
71 | #          1  ""
72 | #          1  memory_freeze_benchmark.rb:19
73 | 


--------------------------------------------------------------------------------