Re: Slow on Linux

[Yonatan Goraly]

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).forwar
   

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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