just 2 cents, if your 8 IEs are running in one process, which is default to my knowledge, they are sharing the same urlhelper/toolkit which default to 4 max parallel connections. I suggest you write a small java programm that tests it for you (with commons-httpclient) or use jmeter or at least wget/curl.
regards Leon On Mon, May 5, 2008 at 1:10 PM, Gilbert, Antoine <[EMAIL PROTECTED]> wrote: > I open 8 IE on a remote computer, basically once a JSP is called, the > browser is just waiting the process to be done. > > > > -----Original Message----- > From: David Smith [mailto:[EMAIL PROTECTED] > Sent: 4 mai 2008 23:00 > To: Tomcat Users List > Subject: Re: Tomcat problem on a multiple CPU system > > Can you describe how you open the 8 browser windows and what browser you > > are using? I ask because those 8 browser windows may be coming from one > > process and using at most 2 connections, hence the slower processing. > Firefox normally only has one process no matter how you open the new > windows. IE can be 8 separate processes if you launch each separately > from Explorer (ie the Start button or desktop shortcut) and not use the > new window menu option or ctrl-n. > > --David > > Gilbert, Antoine wrote: > > Well, each process is a image rendering process. > > > > But my point is, if I launch 8 threads directly in a JVM outside of > > tomcat, it run faster and use 100% of the 8 CPU... > > > > If I make a Servlet (or a JSP) who will start a process each time I > call > > it (I call it 8 times). > > > > So, the big question is, why It's fast directly on the JVM and it's > slow > > on Tomcat ? Why with Tomcat It's not possible to use 100% of all the 8 > > CPU ? There is no data transfer between client and server, in both > case > > the images are rendered on the disk. > > > > I just made this rendering test to expose the fact that I'm unable to > > make my tomcat use efficiently all my CPU. > > > > So the big question, why these 8 processes run betters than these 8 > > process within Tomcat ? > > > > > > > > -----Original Message----- > > From: Alan Chaney [mailto:[EMAIL PROTECTED] > > Sent: 4 mai 2008 17:33 > > To: Tomcat Users List > > Subject: Re: Tomcat problem on a multiple CPU system > > > > Hi Antoine > > > > The thing to remember is that this is a system which has (at least) > four > > > > main parts: > > > > 1. Tomcat > > 2. The operating system > > 3. A network connection > > 4. Your application > > > > (and potentially) > > > > 5. A database (but you didn't mention that) > > > > Here are some questions. > > > > 1. How do you make the connection to the servlet. Does the browser run > > > on the same machine as the application? > > > > 2. Does you application create network traffic? If so, how many bytes > > are transferred to the browser? Each servlet thread will have to wait > > until the application has transferred all the data out. > > > > 3. What kind of disk activity does your application generate? Is it > > different when the app is running from the servlet? > > > > Probably somewhere your servlet threads are sleeping waiting for a > > resource. You could do a thread dump to see what is happening (I don't > > > use Windows so I can't remember how you do that with the Win setup) > > > > In the end, you'll need to profile the system to work out where the > > bottlenecks are. You'll need to use network analysers and probably > Java > > profilers to track down what's happening such as when packets are > > received, when the replies are generated and maybe profile what your > > app. is doing. > > > > HTH > > > > Alan Chaney > > > > > > > > > > Gilbert, Antoine wrote: > > > >> Hi > >> > >> > >> > >> I have a 2x quad core (8 cpu units) server. > >> > >> > >> > >> If I start a java program and this one is launching (at the same > time) > >> > > 8 > > > >> thread doing some CPU intensive jobs, all the CPU are used at 100%, > >> > > and > > > >> that's what I'm expecting.. > >> > >> > >> > >> But, if I am using tomcat, and I call a servlet 8 times to process > >> > > these > > > >> 8 jobs, it take longer to execute these same 8 jobs and all the CPU > >> > > are > > > >> not used at 100%, it's more like 30%... > >> > >> > >> > >> Any idea about this problem or behavior ? I'm using Tomcat 5.5.17, > >> windows, JDK 1.6 > >> > >> > >> > >> Antoine > >> > >> > >> > >> !DSPAM:481e1bf27941527717022! > >> > >> > > > > --------------------------------------------------------------------- > > To start a new topic, e-mail: users@tomcat.apache.org > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > > > --------------------------------------------------------------------- > > To start a new topic, e-mail: users@tomcat.apache.org > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > > -- > David Smith > Network Operations Supervisor > Department of Entomology > Cornell University > 2132 Comstock Hall > Ithaca, NY 14853 > Phone: (607) 255-9571 > Fax: (607) 255-0940 > > > --------------------------------------------------------------------- > To start a new topic, e-mail: users@tomcat.apache.org > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > > > --------------------------------------------------------------------- > To start a new topic, e-mail: users@tomcat.apache.org > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
