On Fri, 9 Aug 2002, Mark Annal wrote:
> Date: Fri, 9 Aug 2002 11:58:05 -0700
> From: Mark Annal <[EMAIL PROTECTED]>
> Reply-To: Tomcat Users List <[EMAIL PROTECTED]>
> To: Tomcat Users List <[EMAIL PROTECTED]>
> 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.
>
One particular thing you will want to do is kill the access logging that
was turned on by default through 4.0.2 or so -- simply comment out the
<Valve> element that defines the AccessLogValve in server.xml it is
enabled.
Craig
> _________________________________________________________________
>
> Mark Annal e-mail: [EMAIL PROTECTED]
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>
> -----Original Message-----
> From: Durham David Cntr 805CSS/SCBE [mailto:[EMAIL PROTECTED]]
> 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:[EMAIL PROTECTED]]
> > 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
> > [EMAIL PROTECTED]
> >
> >
> > -----Original Message-----
> > From: Marinko, Jeff [mailto:[EMAIL PROTECTED]]
> > 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:[EMAIL PROTECTED]]
> > 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:[EMAIL PROTECTED]]
> > > 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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