Forum: Ruby-dev Plan of set_trace_func

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*1: [ruby-core:45949] Re: [ruby-trunk - Feature #6649] Add new
set_trace_func events "b-call", "b-return"

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max = 10_000_000
require 'benchmark'
Benchmark.bm{|x|
  x.report{
    max.times{
      a = 1
      b = 2
    }
  }
  set_null_profiler
  x.report{
    max.times{
      a = 1
      b = 2
    }
  }
}

# C code
rb_define_global_function("set_null_profiler", set_null_profiler, 0);

static void
null_func(rb_event_flag_t evflag, VALUE data, VALUE self, ID mid, VALUE
klass)
{

}

static VALUE
set_null_profiler(VALUE self)
{
    rb_add_event_hook(null_func, RUBY_EVENT_LINE, 0);
    return Qnil;
}

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       user     system      total        real
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  10.720000   0.020000  10.740000 ( 10.740693)  #1) null trace $B$"$j(B
   6.810000   0.000000   6.810000 (  6.816267)  #2) n/trace w/o setjmp
   6.260000   0.010000   6.270000 (  6.265966)  #3) w/o exec_event_hooks
   5.430000   0.000000   5.430000 (  5.426709)  #4) w/o thread_exec_e...

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