From: Eric Hodel <drbrain@...7.net>
Date: 2010-12-15T04:07:53+09:00
Subject: Re: Ruby 1.9.2 : Io performance when application use multithread

On Dec 14, 2010, at 05:34, Regis d'Aubarede wrote:
> The file attachment is an simple script for measure performance
> between client TCP and server, in Mbyte/s.
> 
> With Ruby 1.9.2, when the server run in multi thread
> ( Thread.new(serv.accept()) {...} ) the script  give
> a very poor transfer rate ( 3Mbyte on connection on localhost ).
> 
> When none-multi thread, performance is good :
> same as jruby and MRI ( 470 Mbyte/s )
> (ironRuby give a stange 110 Mbyte/s).
> 
> Usage :
>> ruby gbits.rb server 4040      #  server (monothread)
>> ruby gbits.rb server 4040 t    #  server (multihread)
> 
>> ruby gbits.rb client 127.0.0.1 4040 10  # 10=> 10 MB data length
> 
> OS:    Windows 7
> Proc:  core i7, 1 Gbps ethernet
> Ruby:  1.9.2dev (2010-07-02) [i386-mingw32]
> jruby: 1.5.0
> ir:    1.1.0.0 on .NET 4.0.30319.1
> ruby:  1.8.6
> 
> 
> Tested on Linux
> Ubuntu 10.4 (same machine with Virtalbox)
> ruby 1.9.1p378 (2010-01-10 revision 26273) [i486-linux]
> 
> server threaded : 844 MB/s
> server non-threaded: 989 MB/s
> same delta with jruby

On OS X 10.6 I don't see a performance drop for threaded vs non threaded.  I ran your script with an argument of 1000 instead of 10 as the results for 10 were too variable.

ruby 1.9.3dev (2010-12-04 trunk 30078) [x86_64-darwin10.5.0]   runs ~ 420MB/s both
ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64-darwin10.4.0] runs ~ 420MB/s both
ruby 1.8.7 (2010-01-10 patchlevel 249) [i686-darwin10.2.0]     runs ~ 460MB/s without t
ruby 1.8.7 (2010-01-10 patchlevel 249) [i686-darwin10.2.0]     runs ~ 455MB/s with t
ruby 1.8.7 (2009-06-12 patchlevel 174) [universal-darwin10.0]  runs ~ 490MB/s without t
ruby 1.8.7 (2009-06-12 patchlevel 174) [universal-darwin10.0]  runs ~ 470MB/s with t