gistfile1.rb

# encoding: UTF-8
require 'logging'

log = Logging.logger['read_rate']
log.add_appenders(
  Logging.appenders.file(
    "1.log",
    :layout        => Logging.layouts.pattern(:pattern => '%m\n'),
    :auto_flushing => 100 
  )   
)

a = "ümlaut"
b = "hello ümlaut".force_encoding("BINARY")

200.times {
  log.info(a)
  log.info(b)
}

log.appenders.first.instance_eval do
  puts @buffer.size 
end

puts IO.read("1.log").size