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Author SHA1 Message Date
ko1
10b800133e add several counters to analyze ivar inline caches. 
* debug_counter.h: add (and renamed) several counters:
  ivar_get_ic_hit
  ivar_get_ic_miss
  ivar_get_ic_miss_serial
  ivar_get_ic_miss_unset
  ivar_get_ic_miss_noobject
  ivar_set_ic_hit
  ivar_set_ic_miss
  ivar_set_ic_miss_serial
  ivar_set_ic_miss_unset
  ivar_set_ic_miss_oorange
  ivar_set_ic_miss_noobject
  ivar_get_base
  ivar_set_base

  See related source code to know what counters mean.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57980 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
 2017-03-15 08:25:58 +00:00
nobu
b80c265fa4 debug_counter.c: debug_counter_names [ci skip] 
* debug_counter.c (debug_counter_names): stringize debug counter
  names by preprocessor.

* debug_counter.h (RB_DEBUG_COUNTER): define counter names outside
  the include guard, to expand multiple times.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57826 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
 2017-03-10 07:18:03 +00:00
ko1
76c4cca19c add performance counting mechanism for MRI debug/tuning purpose. 
* How to enable this feature?
  * define USE_DEBUG_COUNTER as 1.
  * you can disable to output the result with
    RUBY_DEBUG_COUNTER_DISABLE environment variable
    even if USE_DEBUG_COUNTER == 1.

* How to add new counter?
  * add COUNTER(<name>) line on debug_counter.h.
  * include "debug_counter.h"
  * insert RB_DEBUG_COUNTER_INC(<name>) line on your favorite place.

* counter output example:
  [RUBY_DEBUG_COUNTER]    mc_inline_hit   999
  [RUBY_DEBUG_COUNTER]    mc_inline_miss  3
  [RUBY_DEBUG_COUNTER]    mc_global_hit   23
  [RUBY_DEBUG_COUNTER]    mc_global_miss  273
  [RUBY_DEBUG_COUNTER]    mc_global_state_miss    3
  [RUBY_DEBUG_COUNTER]    mc_class_serial_miss    0
  [RUBY_DEBUG_COUNTER]    mc_cme_complement       0
  [RUBY_DEBUG_COUNTER]    mc_cme_complement_hit   0
  [RUBY_DEBUG_COUNTER]    mc_search_super 1384
  [RUBY_DEBUG_COUNTER]    ivar_get_hit    0
  [RUBY_DEBUG_COUNTER]    ivar_get_miss   0
  [RUBY_DEBUG_COUNTER]    ivar_set_hit    0
  [RUBY_DEBUG_COUNTER]    ivar_set_miss   0
  [RUBY_DEBUG_COUNTER]    ivar_get        431
  [RUBY_DEBUG_COUNTER]    ivar_set        465

  * mc_... is related to method caching.
  * ivar_... is related to instance variable accesses.

* compare with dtrace/system tap features, there are completely
  no performacne penalties when it is disabled.

* This feature is supported only on __GNUC__ compilers.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57676 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
 2017-02-21 08:18:15 +00:00