mruby-memprf is a simple memory profiler for mruby.
% mruby-memprof -m hello.rb
### Just after mrb_open_allocf():
number of malloc calls: 6480
number of realloc calls: 0
number of free calls: 1436
number of free(!NULL) calls: 334
number of free(NULL) calls: 1102
total size of allocated memory: 689710 bytes
current number of allocated objects: 6146
current size of allocated memory: 611230 bytes
Hello, world!
### Just after mrb_close():
number of malloc calls: 6509
number of realloc calls: 4
number of free calls: 10530
number of free(!NULL) calls: 6509
number of free(NULL) calls: 4021
total size of allocated memory: 745658 bytes
current number of allocated objects: 0
current size of allocated memory: 0 bytes
After mrb_close(),
- "number of malloc calls" and "number of free(!NULL) calls" must be same (or some memory was leaked).
- "current number of allocated objects" must be 0 (or some memory was leaked).
% cat gc.rb
puts "Before GC:"
MemProf.show
GC.start
puts "After GC:"
MemProf.show
% mruby-memprof gc.rb
Before GC:
number of malloc calls: 6510
number of realloc calls: 4
number of free calls: 1447
number of free(!NULL) calls: 341
number of free(NULL) calls: 1106
total size of allocated memory: 745793 bytes
current number of allocated objects: 6169
current size of allocated memory: 611937 bytes
After GC:
number of malloc calls: 6515
number of realloc calls: 4
number of free calls: 2281
number of free(!NULL) calls: 759
number of free(NULL) calls: 1522
total size of allocated memory: 745969 bytes
current number of allocated objects: 5756
current size of allocated memory: 580153 bytes
- It shows GC frees 413 objects that uses 31784 bytes.
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