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From "Marinko, Jeff" <Jeff_Mari...@intuit.com>
Subject RE: Configuration for High TPS
Date Fri, 09 Aug 2002 19:10:24 GMT
Thanks Mark!  That's some good advice.  I haven't moved on to "tweaking" the
JVM yet, I know there are some options I can use to increase performance,
but I'm not to that point yet.

I'm sticking with the standalone for simplicity.  I'll likely turn this over
to someone else, and the fewer parts, the better.  We examined using Apache
and JServ, and a coworker informed me the installation wasn't that
straightforward.

The logging tip is a good one, thanks!

-----Original Message-----
From: Mark Annal [mailto:MarkAnnal@targusinfo.com]
Sent: Friday, August 09, 2002 11:58 AM
To: Tomcat Users List
Subject: RE: Configuration for High TPS


We ran some high TPS testing recently using a Sun 220R running Solaris
8. We were running an Apache/Tomcat combination using the mod_webapp
connector.

Just running a dumb simple servlet we were topping out at 165 tps and
80% CPU.

We tried repeating the test using Tomcat standalone trying to figure out
where the bottleneck was. We still topped out at 165 tps despite
everything we tried to tweak. Our CPU was drastically reduced though to
40%.

After running some e-mails through this list, the consensus was that we
needed to tweak with our JVM as this was probably the cause of our
"ceiling". Not the web server configuration and not the horsepower on
the machine. Actually, in standalone mode, we could not drive our CPU
load beyond 40%.

So far, we haven't had a chance to research this further and our
production app is not pushing any limits just yet so its on the back
burner.

By the way, check how much stuff your Tomcat installation is logging.
The default configuration is pretty verbose and this consumes large
amounts of horsepower writing it all to disk. WinNT isn't overly good at
walking and chewing gum and a lot of disk activity can drain resources
pretty quickly.

_________________________________________________________________

Mark Annal                       e-mail: markannal@targusinfo.com
TARGUSinfo                       phone : (585) 598-7011
255 Woodcliff Drive              fax   : (585) 598-7001
Fairport, NY 14450               web   : www.targusinfo.com
_________________________________________________________________


-----Original Message-----
From: Durham David Cntr 805CSS/SCBE [mailto:David.Durham1@scott.af.mil] 
Sent: Friday, August 09, 2002 2:32 PM
To: Tomcat Users List
Subject: RE: Configuration for High TPS


Have you integrated Tomcat with another webserver for the static
content, assuming you have some.  That would more than likely improve
performance.

> -----Original Message-----
> From: Turner, John [mailto:JTurner@AAS.com]
> Sent: Friday, August 09, 2002 12:52 PM
> To: 'Tomcat Users List'
> Subject: RE: Configuration for High TPS
> 
> 
> 
> http://jakarta.apache.org/tomcat/tomcat-4.1-doc/config/coyote.html
> 
> John Turner
> jturner@NOSPAM.aas.com
> 
> 
> -----Original Message-----
> From: Marinko, Jeff [mailto:Jeff_Marinko@intuit.com]
> Sent: Friday, August 09, 2002 1:50 PM
> To: 'Tomcat Users List'
> Subject: RE: Configuration for High TPS
> 
> 
> Where can I find documentation on the Coyote connector (such
> as the exact
> class name)?
> 
> What is really bothering me (currently), is once I start
> getting connection
> errors, my CPU usage (roughly) doubles, and I get connection 
> errors much
> more easily (as if acceptCount was reduced somehow).  Any ideas on the
> cause/solution for this?
> 
> -----Original Message-----
> From: Sullivan, Mark E [mailto:Mark.Sullivan@nav-international.com]
> Sent: Friday, August 09, 2002 10:31 AM
> To: 'Tomcat Users List'
> Subject: RE: Configuration for High TPS
> 
> 
> what version of tomcat are you running? In the 4+ versions
> the Coyote HTTP
> connector is supposed to perform better. 
> 
> > -----Original Message-----
> > From: Marinko, Jeff [mailto:Jeff_Marinko@intuit.com]
> > Sent: Friday, August 09, 2002 12:23 PM
> > To: Tomcat Users List
> > Subject: Configuration for High TPS
> > 
> > 
> > I'm attempting to configure Tomcat for a test environment to
> > handle a high
> > number of transactions per second (TPS) and would like any 
> > advice others may
> > like to contribute.  The machine is a fairly powerful dual 
> > processor machine
> > (1+ GHz) running WinNT.  I'm using a tool to send requests, 
> > where I can
> > specify the TPS and number of requests total to send.
> > 
> > I'm running the following with "ok" results, but I'm
> interested in any
> > suggestions or better explanations of some of the fields:
> > 
> > <Connector
> > className="org.apache.catalina.connector.http.HttpConnector"
> >                port="8080" minProcessors="200" maxProcessors="200"
> >                enableLookups="true" redirectPort="8443"
> >                acceptCount="2000" debug="0" 
> > connectionTimeout="60000"/>
> > 
> > Perhaps my biggest problem is the number of connections
> > Tomcat accepts fills
> > up rather quickly, some of the connections my tool generates 
> > are refused
> > (presumably due to the acceptCount limit being reached, and I 
> > have increased
> > it a couple times).
> > 
> > Any advice would be appreciated!
> > 
> > Jeff
> > 
> > 
> > --
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