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From Yonatan Goraly <ygor...@sbcglobal.net>
Subject Re: Slow on Linux
Date Mon, 24 Nov 2003 22:16:19 GMT
The exact execution time of that line of code is not very relevant, 
since the difference is between an interval I can't notice to an 
interval I can notice very well - should be at least a factor of x100.
I just finished installing RedHat 9 (32 bit), the performance is much 
better, and the CPU is working much less. I guess it was something 
related to the Mandrake version I had.
It still feels slower than what I am used to on Windows, but I have to 
make measurements in order to arrive at any conclusions.

Shapira, Yoav wrote:

>Howdy,
>I understand and agree with your considerations.  The only thing I asked
>was very simple: how fast does the same call perform on a different
>platform.  Not the overall application, not DB queries, just the exact
>same line of code (which has four function calls).
>
>Yoav Shapira
>Millennium ChemInformatics
>
>
>  
>
>>-----Original Message-----
>>From: Yonatan Goraly [mailto:ygoraly@sbcglobal.net]
>>Sent: Monday, November 24, 2003 2:55 PM
>>To: Tomcat Users List
>>Subject: Re: Slow on Linux
>>
>>The same application is deployed on multiple Windows boxes, with
>>excellent performance (unless there is a heavy DB query involved, with
>>    
>>
>a
>  
>
>>fast network and client machine the response seems to be instant with
>>servers that should be dwarfed by this one).
>>As we start to provide hosted services, the cost of the OS and DB
>>    
>>
>become
>  
>
>>significant, that is the reason for evaluating Linux. I have selected
>>AMD Opteron since I know that I can fall back to 32 bit OS if the 64
>>    
>>
>bit
>  
>
>>is not stable, and that it performs very well in that scenario. I
>>started with Mandrake since it was possible to download ISO images, but
>>I have also ordered an AMD 64 version of SUSE LINUX, since they have
>>better support for that platform.
>>Just to be able to compare, I will install Windows 2000 on the server
>>    
>>
>as
>  
>
>>well.
>>IMHO, if the performance I see is within the expected range, Windows is
>>a much better OS for that purpose.
>>I have read about performance issues related to Java java using OS
>>threads in Linux, that should be resolved in the 2.6 version of the
>>kernel - might that be related? Red hat have published that they have a
>>solution implemented in their current products, the only problem is
>>    
>>
>that
>  
>
>>the price is high
>>
>>Shapira, Yoav wrote:
>>
>>    
>>
>>>Howdy,
>>>First of all, how fast was the forward call on another platform?
>>>
>>>OTOH, 500ms for the line of code you gave below is not that atrocious.
>>>Both the getRequestDispatcher and forward calls are not lightweight.
>>>
>>>Yoav Shapira
>>>Millennium ChemInformatics
>>>
>>>
>>>
>>>
>>>      
>>>
>>>>-----Original Message-----
>>>>From: Yonatan Goraly [mailto:ygoraly@sbcglobal.net]
>>>>Sent: Monday, November 24, 2003 2:17 AM
>>>>To: Tomcat Users List
>>>>Subject: Slow on Linux
>>>>
>>>>I am in the process of evaluating Linux as a server platform for my
>>>>application (this is my first Linux experience).
>>>>The environment is:
>>>>- Single AMD Opteron 1.8 GHz
>>>>- Tyan motherboard with 1 GB memory
>>>>- Mandrake Linux 9.2 AMD64 RC1
>>>>- SUN JDK 1.4.2_02
>>>>- Tomcat 4.29, without Apache web server
>>>>
>>>>The first impression is that the application is extremely slow. I
>>>>        
>>>>
>found
>  
>
>>>>out that calling
>>>>getServletConfig().getServletContext().getRequestDispatcher(url).forw
>>>>        
>>>>
>ar
>  
>
>>>>        
>>>>
>>>d(re
>>>
>>>
>>>      
>>>
>>>>quest,
>>>>response); can take about 500 ms (I put one log command before the
>>>>
>>>>
>>>>        
>>>>
>>>call,
>>>
>>>
>>>      
>>>
>>>>and the other at the beginning of the forwarded JSP page, so I know
>>>>
>>>>
>>>>        
>>>>
>>>that
>>>
>>>
>>>      
>>>
>>>>the only call my application does between the log commands is the
>>>>forward call)
>>>>
>>>>Please advise
>>>>
>>>>
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>>>>
>>>>        
>>>>
>>>
>>>
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>>>      
>>>
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>This e-mail, including any attachments, is a confidential business communication, and
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immediately delete this e-mail from your computer system and notify the sender.  Thank you.
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