[ruby-core:40838] [Backport93 - Backport #5592][Open] ruby-1.9.3-p0 mswin IO#write still slower than 1.9.2

Issue #5592 has been reported by Akio Tajima.

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Backport #5592: ruby-1.9.3-p0 mswin IO#write still slower than 1.9.2 
http://redmine.ruby-lang.org/issues/5592

Author: Akio Tajima
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 


In spite of Backport #5585, ruby-1.9.3-p0 is 10 times slower than 1.9.2.

#-test script 
t=Time.new
str = '0123456789'*10
open('test.txt','wb') do |f|
  100000.times do
    f.write str
  end
end
puts "Write:#{Time.new-t}(s)"

ruby 1.9.2p290 (2011-07-09) [i386-mswin32_100]
Write:0.068004(s)

ruby 1.9.3p0 (2011-10-30) [i386-mswin32_100]  # after #5585 applied
Write:0.914052(s)

I've reviewd r33667(trunk) and accepted its effectiveness. Thanks usa for your good job.
After the patch was applied, the test result:

ruby 1.9.3p0 (2011-10-30) [i386-mswin32_100]
Write:0.069004(s)

ruby 1.9.3p0 (2011-10-30) [x64-mswin64_100]
Write:0.066004(s)

Please backport the patch. Thanks.


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