On 6/19/06, Leon Rosenberg <[EMAIL PROTECTED]> wrote:
On 6/19/06, Biernatowski Bartosz J <[EMAIL PROTECTED]> wrote: > I am about 90% sure the bottleneck is Tomcat or what's running on top of > Tomcat. Application uses JDBC queries to MS SQL server > Chips are Intel Xeon. My monitoring data: > Memory utilization under 30%, CPU under 10%. Using hardcore performance > tools and systematic approach. > The bottom line is that Tomcat/my application combo don't seem to handle > more than a certain number of users. All I want to do is to up the # of > users by 3. Sounds like your db connection pool is the problem. Maybe you should check whether you have enough connections in the connection pool.
Connection pooling, ahh yes. This is also a likely problem if you aren't doing any.
> So far it sounds that the approach of adding separate instance of Tomcat and > using round robin is better than adding a separate JVM. I think both options are equal. How do you plan to run a separate tomcat in the same JVM?
Both options are equaly stupid. Putting multiple intances of tomcat on a single box is pretty worthless unless you have serious application problems. Tomcat is multi-threaded, and will by nature utilize a multi-CPU setup. If you ask me (and hey, we have thousands of concurrent users and a
lot more requests) you need a monitoring tool for your application inside your application not just vmstat or top. You need to know which servlet/action/whatever your presentation layer is takes the time and trace it down in the persistence. Everything else is just kindergarten :-) > > > BJ Biernatowski > Application Developer, e-Business Leon > > -----Original Message----- > From: Leon Rosenberg [mailto:[EMAIL PROTECTED] > Sent: Monday, June 19, 2006 10:49 AM > To: Tomcat Users List > Subject: Re: Tomcat's scalability > > are you sure that tomcat is your bottleneck? > Your 4 CPU machine (which cpu's btw?) should be able to handle more > than 1000 users (unless you are speaking about suns cpu) without > problems. Maybe you should provide more info about your application. > Do you have any monitoring data? > > Leon > > On 6/19/06, Biernatowski Bartosz J <[EMAIL PROTECTED]> wrote: > > Hello, > > I was hoping somebody on the list might point me in the right direction... > > > > I am trying to scale up Tomcat based web application currently supporting > > ~100 users to 350 users. > > > > It seems that I have enough hardware: 2 load balanced servers x 4 CPUs > each > > with 4 GB of RAM which is underutilized for most of the time even though > > application performance slows dramatically at peak times. > > > > I was advised to install multiple JVMs in order to improve Tomcat's > > performance. Another option I considered was to install 2 instances > > of Tomcat on each server to see whether it would handle increased load. > > > > Would anybody know what kind of performance improvement would multiple > > JVM/Tomcat installations provide? Are there any benchmarks available? > > > > Thank you for any help! > > BJ > > > > BJ Biernatowski > > Application Developer > > > > This e-mail, including attachments, may include confidential and/or > proprietary information, and may be used only by the person or entity to > which it is addressed. If the reader of this e-mail is not the intended > recipient or his or her authorized agent, the reader is hereby notified that > any dissemination, distribution or copying of this e-mail, including its > contents and attachments, is prohibited. If you have received this e-mail in > error, please notify the sender by a "reply to sender only" message and > delete this e-mail immediately and destroy all electronic and hard copies of > the communication, including attachments. > > > > > > --------------------------------------------------------------------- > > 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] > > > This e-mail, including attachments, may include confidential and/or proprietary information, and may be used only by the person or entity to which it is addressed. If the reader of this e-mail is not the intended recipient or his or her authorized agent, the reader is hereby notified that any dissemination, distribution or copying of this e-mail, including its contents and attachments, is prohibited. If you have received this e-mail in error, please notify the sender by a "reply to sender only" message and delete this e-mail immediately and destroy all electronic and hard copies of the communication, including attachments. > > > --------------------------------------------------------------------- > 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]
