Block versus String With Incrementing Var Showdown

gistfile1.rb

require 'benchmark'
require 'logger'

logger = Logger.new("/dev/null")
logger.level = Logger::INFO

puts "Simple Strings"
Benchmark.bmbm do |x|
  x.report("string form") {
    x = 0
    100_000.times do
      logger.debug "a simple string message with var #{x}"
      x+=1
    end
  }
  x.report("block form") {
    x = 0
    100_000.times do
      logger.debug { "a simple string message with var #{x}" }
      x+=1
    end
  }
end
puts

Simple Strings
Rehearsal -----------------------------------------------
string form   0.230000   0.000000   0.230000 (  0.228999)
block form    0.350000   0.020000   0.370000 (  0.373413)
-------------------------------------- total: 0.600000sec

                  user     system      total        real
string form   0.250000   0.000000   0.250000 (  0.250874)
block form    0.340000   0.020000   0.360000 (  0.354017)