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From Arieh Markel <Arieh.Mar...@Sun.COM>
Subject Re: Solaris Sparc Performance Problem
Date Tue, 24 Apr 2001 17:31:23 GMT
Here is what I would do to see the differences:

	. on Solaris, run the application through truss
	
	. on Linux, run the application through strace
	
This should yield information about where the time is being spent.

I am also wondering whether the Solaris machine is properly configured
with regards to things like nameserver lookups, proxy setups, etc.

Arieh

> Mailing-List: contact tomcat-dev-help@jakarta.apache.org; run by ezmlm
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> From: doug@hornig.net (Douglas E. Hornig)
> Subject: Solaris Sparc Performance Problem
> To: tomcat-dev@jakarta.apache.org
> Content-Disposition: inline
> X-MIME-Autoconverted: from quoted-printable to 8bit by amon.Central.Sun.COM id 
LAA19808
> 
> I posed this problem to the good folks on the users list.  While they are a 
great bunch, and several offered some suggestions, I was unable to get any help 
from them so I'm trying the dev list now.
> 
> The problem in a nutshell is that requests I make to tomcat running on a 
Solaris Sparc from a Windows client take at least 0.15 to 0.20 seconds.  If I 
run tomcat on a Linux PC, or use a Linux PC as a client instead of Windows, the 
turnaround time is more like 0.01 seconds.
> 
> Here are the particulars:
> 
> * All machines are on the same 100Mbit ethernet.
> * Tomcat is running standalone.
> * I tried a couple of different Sparcs, a 420R and an Ultra 5, neither with 
any load.  No difference.
> * I wrote a simple Java program to use as the test client so there are no 
browsers involved.
> * I tried various different Java VM releases on the Sparcs, 1.2.1 and 1.3.0 
with no difference seen.
> * I tried a couple different PCs (NT4 and Win2000) and found the same results.
> * Other programmers here reported slowness using VisualBasic as the client 
instead of Java (that's how I got started investigating this).  Java Web Server 
2.0 also appeared to have the same problem as tomcat.  I have not personally 
been able to verify these assertions.
> * The results seem very repeatable.
> * I used a generic tomcat 3.2.1 for the server and hit the 
examples/servlet/HelloWorldExample URL for these tests.
> 
> This is a very serious problem for us.  The above mentioned VB client that 
we're developing can make dozens of calls to the server per screen, so those 0.2 
second delays add up.  I like Linux a lot myself but the bosses here feel more 
comfortable with more traditional business models, and besides shouldn't Java 
run best on a Sparc with Solaris?  I am perplexed as to what the problem is and 
would greatly appreciate any help or ideas I can get.
> 
> Thanks in advance,
> 
> Douglas Hornig
> Dartmouth-Hitchcock Medical Center
> Lebanon, NH

--
 Arieh Markel		                Sun Microsystems Inc.
 Network Storage                        500 Eldorado Blvd. MS UBRM11-194
 e-mail: arieh.markel@sun.COM           Broomfield, CO 80021
 Pray for snow !!!!                     Phone: (303) 272-8547 x78547
 (e-mail me with subject SEND PUBLIC KEY to get public key)


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