80ms was with the server saturated and running 100% CPU utilization. Min
times were in the 10ms range, with the more db intensive pages having min
times in the 60ms range.

Here's my complete testing results.

http://www.mhsoftware.com/caldemo/manual/en/pageFinder.html?page=622.html

I'm sure a large part of my overhead was that the testing took place with
the DB, and tomcat app on the same consumer grade machine.

George Sexton
MH Software, Inc.
http://www.mhsoftware.com/
Voice: 303 438 9585
  

> -----Original Message-----
> From: Leon Rosenberg [mailto:[EMAIL PROTECTED] 
> Sent: Monday, January 30, 2006 3:18 PM
> To: Tomcat Users List
> Subject: Re: Tuning Tomcat , i need some advice
> 
> On 1/30/06, George Sexton <[EMAIL PROTECTED]> wrote:
> > Database interaction is by far the major issue. In my 
> application, a page
> > with no db interaction runs in something like 80ms, while a 
> page with DB
> > interaction takes something like 350-400ms. There's no 
> silver bullet to
> > tuning tomcat applications, and most of the advice you'll 
> get here won't
> > make any difference (use this connector, instead of that). 
> So, my advice is:
> 
> Hmm, 80 ms per page is extremely slow. We have a high traffic
> application here with approx. 100 request / per second / per
> webserver. Our middle execution time is by 10 ms (both db and not db).
> Requests without calls to backend are served in below 1 millisecond
> (mostly ajax).
> 
> I would say that the most important point is the size of the jsp.
> Large jsps need time, and CPU.
> 
> Other points are:
> Avg. Request duration.( see above). With 30 requests per second you
> can't afford spending more than 33 ms per request.
> 
> Connection Speed: If you have keep-alive on, the thread will be
> blocked until the data is delivered. Http 1.1 (keep-alive) connections
> consume 1.5 threads per connection. My advice: use http 1.0. Zipping
> can also reduce thread consumption (but increase cpu consumption).
> 
> WIth all above said, if you can serve fast enough, use no http1.1 and
> zip, you can use tomcat default settings (max 150 threads).
> 
> Alas, do you know your read/update ratio for the db? If you have
> 80-90% reads on the DB, you can win a lot of performance through
> caches.
> 
> Regards
> Leon
> 
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