From: "dunric (David Unric)" <dunric29a@...>
Date: 2013-04-05T00:22:50+09:00
Subject: [ruby-core:53996] [ruby-trunk - Bug #8211] Performance regression of method calls


Issue #8211 has been updated by dunric (David Unric).


bitsweat (Jeremy Kemper) wrote:
> David, this looks a lot like the CFLAGS issues folks were hitting with rvm. Essentially, getting unoptimized Ruby builds.
> 
> Take a close look at the differences in RbConfig::CONFIG between your Ruby builds.
> 
> ruby -e 'puts RUBY_DESCRIPTION, RbConfig::CONFIG["cflags"], RbConfig::CONFIG["CFLAGS"]'
> 
> How did you build Ruby?

ruby -e 'puts RUBY_DESCRIPTION, RbConfig::CONFIG["cflags"], RbConfig::CONFIG["CFLAGS"]' 

ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-linux]
 -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Werror=pointer-arith -Werror=write-strings -Werror=declaration-after-statement -Werror=implicit-function-declaration

----------------------------------------
Bug #8211: Performance regression of method calls
https://bugs.ruby-lang.org/issues/8211#change-38231

Author: dunric (David Unric)
Status: Open
Priority: Normal
Assignee: 
Category: core
Target version: 
ruby -v: 2.0.0p0


There are significant performance regressions in the newer Ruby versions.
When compared to the last 1.9 patch build, method & lambda calls are about 3 times slower !

Benchmarking results:
_____________________________________________________________
Ruby 1.9.3p392
       user     system      total        real
lambda:  8.310000   0.000000   8.310000 (  8.315247)
instance method:  5.210000   0.000000   5.210000 (  5.219299)
class method:  5.040000   0.000000   5.040000 (  5.037483)

Ruby 2.0.0-p0
       user     system      total        real
lambda: 25.310000   0.010000  25.320000 ( 25.339897)
instance method: 17.870000   0.000000  17.870000 ( 17.882656)
class method: 17.630000   0.010000  17.640000 ( 17.650515)

Ruby 2.1.0-dev
       user     system      total        real
lambda: 19.210000   0.000000  19.210000 ( 19.227314)
instance method: 13.930000   0.000000  13.930000 ( 13.936974)
class method: 14.000000   0.000000  14.000000 ( 14.001582)
_____________________________________________________________


The code:
_____________________________________________________________
require 'benchmark'

do_custom_stuff = lambda { 1 + 1 + 1 }

class CustomStuff
  def self.do
    1 + 1 + 1
  end

  def do
    1 + 1 + 1
  end
end

custom_stuff = CustomStuff.new

Benchmark.bm { |b| 
   MANY = 50_000_000
   b.report("lambda:")          { MANY.times { do_custom_stuff.call }}
   b.report("instance method:") { MANY.times { custom_stuff.do      }}
   b.report("class method:")    { MANY.times { CustomStuff.do       }}
}
_____________________________________________________________


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