Complete stab in the dark here ... Tomcat serves a maximum number of threads at a time (request processing threads). It may be that Tomcat's timings are accurate for the threads *when* it executes them, but your HTTP Client will be seeing a queue when Tomcat has no spare request thread capacity. You can tweak this with the max processors attribute for Tomcat's connectors.
Just a guess, take with pinch of salt. Allistair > -----Original Message----- > From: Bhaskar [mailto:[EMAIL PROTECTED] > Sent: 13 July 2005 08:09 > To: Tomcat Users List > Subject: Perf Issue: HttpClient.executeMethod takes more time if there > are more number of threads in the process > > > Hi, > I am running tomcat 5.0.28 on Linux (2.6.9-5.ELsmp #1 SMP Wed Jan 5 > 19:29:47 EST 2005 x86_64 x86_64 x86_64 GNU/Linux). > > I am having another test box which runs java process with 1000 > threads(each thread will send 10000 http requests to above > tomcat server > in the delay of 1 ms). This test process uses the HttpCommon api's to > make use of http connection pool's keep alive capability. > Each thread in the above test process will send the post > request to the > tomcat using HttpClient.excecuteMethod. > > If I check the avg response time in the tomcat server it is somewhere > around 12 to 20 ms > > But in the test process, the time taken to execute the > HttpClient.executeMethod varies between 3 ms to 21855 ms > (avg: 1723.61 ms) > > Parallely (still above test process is running) I start same test > process from the same test box with 10 threads (each thread > will send 10 > http requests to above tomcat in the delay of 1 ms). Now I > see the time > taken to execute the HttpCleint.executeMethod varies between > 9ms to 146 > ms (avg: 32.47 ms). > > The difference between first process and second process is number of > threads. I am trying to understand the reason on why > HttpClient.executeMethod is taking more time if I have more number of > threads trying to send the http request? > > Do I need to fine tune something to make it better? Is it a expected > behaviour ? if yes, any reason? > Or I am doing something wrong my code ? > > TIA, > Bhaskar > > > PS: java version "1.4.2-02" > Java(TM) 2 Runtime Environment, Standard Edition (build > Blackdown-1.4.2-02) > Java HotSpot(TM) Client VM (build Blackdown-1.4.2-02, mixed mode) > > At some point if I check the number of established connections thru > netstat in test box, I see the following figure: > > # netstat -a|grep tomcatserver|grep ESTABLISHED|wc -l > 528 > <FONT SIZE=1 FACE="VERDANA,ARIAL" COLOR=BLUE> ------------------------------------------------------- QAS Ltd. Registered in England: No 2582055 Registered in Australia: No 082 851 474 ------------------------------------------------------- </FONT> --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
