Hi Mark, I setup a simple servlet with no code in the doGet() method running in Tomcat 7.0.8 and using jvm 1.6.22 and using httpclient from apache commons lib and I am lucky to get 2.8msec per request as measured at the client. I am thinking the commons httpclient is slow itself.
So what did you use for the client side? Also, I looked at the test results someone ran using Apache httpclient and they took the total number of requests and the time it took to run and came out with an absurd number because the response times were much longer than the number they calaculated. I could do the same thing by say taking 100 requests that ran in parallel and took 100msec each and divide by 100 and say it took 1msec per request but that is not what the user would see. Just interesting how people can twist statistics. -Tony ----- Original Message ---- From: Mark Thomas <ma...@apache.org> To: Tomcat Users List <users@tomcat.apache.org> Sent: Sat, February 12, 2011 11:45:29 AM Subject: Re: Performance Tuning Tomcat 7... On 12/02/2011 18:27, Tony Anecito wrote: > Right now for most of my transactions I get less than 5 microseconds and > around > > 1.2msec is spent on getting to and out of Tomcat and out of to/out of the >client > > call. > > So people were saying look at better parsers or replacing whatever does the > parsing. > > I am measuring round trip time at the client (before and after the jersey > call) > > and getting to 1.47msec. At Tomcat it is less than 5microseconds at the > beginning of the method the GET goes to the end of the method so the code is > very fast. > > So I am thinking whatever parses the cmd and puts together the html response > after the end of the method is where I should focus. Testing Tomcat on localhost with a simple servlet using my 3 year old laptop I can process around 20,000 requests a second on a single connection which is around 50 microseconds per request. That includes server and client processing. Looking at all these numbers suggests that there is a lot of additional overhead somewhere in your system. Based on past experience, guessing where that overhead might be is a waste of time. You need to use a profiler to track it down. I usually use Yourkit since they give free copies to the Tomcat committers for use with Tomcat development. Other profilers are available. Pick the one that works best for you. Mark --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
