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Joe, What version of Tomcat? I use 4.0.3. We have significantly more than 20 users and never see the kind of response that you are experiencing. I built my own startup scripts that give Tomcat the memory it needs to run -- what values did you use? Do you use native access? I am running Tomcat standalone, which is supposed to run slower than IBM's installation but I wouldn't bet on it (what do they have to gain by optimizing Tomcat?). How hard would it be for me to duplicate your test on my system? David Morris >>> joepluta@PlutaBrothers.com 05/10/02 09:54AM >>> > From: David Morris > > I get great performance from Tomcat. I can't tell that servlet based > JSP applications are any slower than green screen. On a 730 with > a CPW of 560/560, we get < .5 second response in either environment. > It runs at an average of 60% utilization through the day taken at 30 > minute > intervals. When I run similar code on a 270 with a CPW of 150, I still > get < > 1 second response, where WebSphere ran about 4 (that was with the > 1.2 JDK, and 3.5.2 - things may have improved). David, I just ran some tests here on my little model 270. Tomcat performed about 20-30% worse than WebSphere with my software under light load, and significantly poorer (200-300%) under heavy load. This is at V4R5 with all current PTFs, and the Tomcat JAR files compiled as shipped at optimization level 30. I'll rerun tests a little later at optimization 40, but I don't see that it could possibly reduce runtime to one-third or less. My tests were not particularly scientific, but they were run on a dedicxated machine, and they jive with what IBM says about Tomcat as well. Tomcat runs nicely under small loads but does not scale very well. With a thin servlet tier such as the one I use, WebSphere clearly outperforms Tomcat. The numbers will be in my WebSphere column on MCPressOnline coming out Monday, but as a preliminary glimpse, on my 370CPW model 270, running 3 users simultaneously, with a user delay of 500ms and a page size of about 10KB, I get an average response time of 131ms for WebSphere and 170ms for Tomcat. Ramping that up to 20 users, WebSphere increases to an average of 1040ms while Tomcat jumps to 3482ms. This is just one man's observation, obviously, but it was consistent throughout my tests. I'll do some additional tests at optimization level 40 when I get a chance. Do you happen to know for sure which JAR files need to be recompiled? From what I can tell, they are as follows: /QIBM/ProdData/HTTPA/admin/pgm/webserver.jar /QIBM/ProdData/HTTPA/admin/pgm/servlet.jar /QIBM/ProdData/HTTPA/admin/pgm/parser.jar /QIBM/ProdData/HTTPA/admin/pgm/jaxp.jar /QIBM/ProdData/HTTPA/admin/pgm/jasper.jar /QIBM/ProdData/java400/jdk12/lib/tools.jar Joe
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