gistfile1.txt

require 'benchmark'

def yields
 yield
end

def named_block &block
 block.call
end

class A
 
 def go
 end
 
 def get_proc
   @proc ||= proc {}
 end
 
 def named_block &block
   block.call
 end
 
 def test_cached n
   @proc ||= proc {}
   n.times {
     named_block(&@proc)
   }
 end
 
end

YO = proc {}

5.times {
Benchmark.bm do |x|
 n = 100000
 x.report("straight yield  ") { n.times { yields {}}}
 x.report("named block     ") { n.times { named_block {}}}
 a = A.new
 b = a.method(:go)
 yo = proc {}
 x.report("cached proc     ") { n.times { named_block(&a.get_proc) }}
 x.report("cached method   ") { n.times { named_block(&b) }}
 x.report("local proc      ") { n.times { named_block(&yo) }}
 x.report("constant as proc") { n.times { named_block(&YO) }}
 x.report("instance varproc") { A.new.test_cached(n) }
end

}
# it would appear that the speedup would come from a type of analysis like
# 

gistfile2.txt

E:\dev\digitalarchive_trunk.trunk>ruby -v speed_test.rb
ruby 1.9.1p376 (2009-12-07 revision 26041) [i386-mingw32]
      user     system      total        real
straight yield    0.032000   0.000000   0.032000 (  0.031250)
named block       0.297000   0.016000   0.313000 (  0.312500) * here's the epic fail I was referring to
cached proc       0.078000   0.000000   0.078000 (  0.078125)
cached method     0.578000   0.015000   0.593000 (  0.593750)
local proc        0.047000   0.000000   0.047000 (  0.046875)
constant as proc  0.047000   0.000000   0.047000 (  0.046875)
instance varproc  0.046000   0.000000   0.046000 (  0.046875) * if we could replace blocks with this it would help the epic fail, but not be faster than straight yield

jruby

straight yield    0.047000   0.000000   0.047000 (  0.047000)
named block       0.078000   0.000000   0.078000 (  0.078000)
cached proc       0.094000   0.000000   0.094000 (  0.094000)
cached method     0.140000   0.000000   0.140000 (  0.140000)
local proc        0.063000   0.000000   0.063000 (  0.063000)
constant as proc  0.062000   0.000000   0.062000 (  0.062000)
instance varproc  0.063000   0.000000   0.063000 (  0.063000) * small speedup over named block, small loss over straight yield