Thanks Peter... We will be interacting with Oracle, Informix, and DB2. The proposed Tomcat application servers will be used with the Business Objects and Crystal BI application.
Thank You Brett MacManus -----Original Message----- From: Peter Lin [mailto:[EMAIL PROTECTED] Sent: Wednesday, March 31, 2004 12:22 PM To: Tomcat Users List Subject: RE: scalability In terms of concurrent requests here's my own experience. Handing 50-150 concurrent requests using either apache AB or JMeter to simulate load doesn't pose any problems that I can see for static or simple dynamic pages. when I say dynamic pages, I mean simple queries which select from one view or simple sql join. the real bottle neck is the database. Depending on the OS you're on, the practical limit of the database in terms of concurrent queries varies quite a bit. If you're using windows and Sql Server, the practical limit for concurrent queries is 2x # of CPU. for example, say you have sql server on a 4 CPU system. the practical limit is 8 concurrent queries. Anything above 8 will get queued up. which means throwing more concurrent requests will just swamp the database. You'll have to test the database you're using to figure out the practical limit for concurrent queries. since you're already using weblogic, I'm going to guess there's an EJB somewhere providing data. If that is the case, follow the normal EJB best practices like using local interfaces to EJB's. In terms of clustering, if you're talking about session replication, I have no experience with clustering TC5. If you're talking about load balancing, there shouldn't be any performance issues. If you're planning on havng lots of servers, I would recommend using hardware load balancing. hope that helps. peter lin "MacManus, Brett C" <[EMAIL PROTECTED]> wrote: Sorry Peter.... You are correct. I need in terms of clustering, and concurrent connections. Thank You Brett MacManus You're going to have to qualify your definition of scalability before anyone can provide useful information. scalability in terms of concurrent users? requests per second? average response time? cluster size? concurrent connections? without a point of reference, scalability means very little :) peter "MacManus, Brett C" wrote: Hello, I am needing information on the scalability of Tomcat. We are currently using Web Logic, but are considering Tomcat and our only concern in scalability. Can anyone help me out with this as I am unable to track down any specifics. Thank You Brett --------------------------------- Do you Yahoo!? Yahoo! Finance Tax Center - File online. File on time. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------- Do you Yahoo!? Yahoo! Finance Tax Center - File online. File on time. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
