Re: Slow on Linux

[Yonatan Goraly]

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:[EMAIL PROTECTED]
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:[EMAIL PROTECTED]
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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