[MacRuby] #1410: String#length is slow when invoke at first time.

28 Oct 2011


      #1410: String#length is slow when invoke at first time.
----------------------------------+-----------------------------------------
 Reporter:  watson1978@…          |       Owner:  lsansonetti@…        
     Type:  defect                |      Status:  new                  
 Priority:  blocker               |   Milestone:                       
Component:  MacRuby               |    Keywords:                       
----------------------------------+-----------------------------------------
 Test Script:
 {{{
 #!ruby
 require 'benchmark'

 Benchmark.bm(15) do |x|
   str = "abcdef" * 10000000
   x.report "#size" do
     str.size
   end

   x.report "#length (1)" do
     # first time
     str.length
   end

   x.report "#length (2)" do
     # second time
     str.length
   end

   str2 = str.dup
   x.report "#length (3)" do
     str2.length
   end
 end
 }}}

 Result:
 {{{
 $ macruby bm_str_length.rb
                      user     system      total        real
 #size            0.000000   0.000000   0.000000 (  0.000012)
 #length (1)      0.000000   0.000000   0.000000 (  0.001750)
 #length (2)      0.000000   0.000000   0.000000 (  0.000008)
 #length (3)      0.000000   0.000000   0.000000 (  0.000010)
 }}}

-- 
Ticket URL: <http://www.macruby.org/trac/ticket/1410>
MacRuby <http://macruby.org/>