From: Robert Klemme <shortcutter@...>
Date: 2008-01-29T02:24:56+09:00
Subject: Re: Ruby Script Under performance in CYGWIN environment

On 28.01.2008 05:02, M. Edward (Ed) Borasky wrote:
> ankit wrote:
>> I have written one ruby script to execute the regression testcases.
>> There are more than five thousand of testcases to be run daily.

What do these test cases do?  Is there any IO involved other than 
reading the code?  What else is going on on that box?  Is it similar 
hardware? ...

>> For Linux, the performance was ok and on expected line but on CYGWIN
>> shell, the script is taking a lot more time ( I would say almost
>> double of time) in running the same testcases as compared to similar
>> script written in  perl.
>>
>> Is ruby under performance is related  and specific to cygwin shell or
>> is ruby not meant at all to be run on windows and this is known
>> performance issue?

Of course it is meant to be run on Windows - otherwise there would be no 
point in having a cygwin package, would it?  I am running my Ruby 
scripts on cygwin for quite some time now and do not encounter any issues.

>> I am using the following : CYGWIN_NT-5.1 and ruby 1.8.4

Since you are giving no hard facts its difficult to answer.  I tend to 
believe that the cygwin version might be slower but haven't measured 
myself and certainly would not expect a factor of two on the same 
hardware.  /Did/ you test on the same hardware?

First of all I would to some measurements to have hard facts.  Maybe a 
simple command line loop like

Robert@Babelfish2 ~
$ ruby -e 't=Time.now;5_000_000.times {};p(Time.now-t)'
2.031


> Download the Ruby source (1.8.6) and recompile it on Cygwin using the 
> following CFLAGS
> 
> export CFLAGS='-O3 -march=<your processor type goes here>'
> 
> For example, if you're running a Pentium 4, do
> 
> export CFLAGS='-O3 -march=pentium4'
> 
> That will give you at least a 10 percent improvement over the base Ruby 
> 1.8.4 you have now.

I doubt that the OP will be satisfied with a 10% improvement.  Btw, the 
current version is not 1.8.4:

Robert@Babelfish2 ~
$ ruby -v
ruby 1.8.6 (2007-03-13 patchlevel 0) [i386-cygwin]

Robert@Babelfish2 ~
$ uname -a
CYGWIN_NT-5.1 Babelfish2 1.5.25(0.156/4/2) 2007-12-14 19:21 i686 Cygwin


Kind regards

	robert