I'll try to address some of Brandon's original questions: 1. We have noticed that Java applications will "hog" the CPU if you let it. 2. We use z/VM on our 2 IFL LPAR. It works great. We are very pleased with its performance. I can't say whether Java would run better without z/VM in the middle, because we never tried that. 3. We don't charge for CPU time. If we did, it would be interesting to see how application groups would react. 4. My advice to make things go faster is to upgrade to the z990. It advertised to be 50% faster than z900, and I have personally witnessed that. We were completely amazed at the performance after we installed the z990. 5. We use BEA WebLogic. 6. The reason you run Java apps on zLinux is the same reason you would run anything there. Don't pick applications that crank the CPU all day, put those on Intel. Choose smaller Java apps that just need a home. Mix in other workload and fill up the environment.
That's my 2 cents. Eric Biggs * [EMAIL PROTECTED] -----Original Message----- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of Brandon Darbro Sent: Friday, June 18, 2004 1:11 PM To: [EMAIL PROTECTED] Subject: J2EE performance? I've had the opportunity to play with JBOSS recently, as well as watch some Websphere testing on our linux guests, and I'm not very happy with the performance and resource utilization. Let's see... what can I tell you about our system: * z800 * 2 IFL's (tested using single and dual, still slow) in LPAR * z/VM 4.4.0 * guest lan networking * 256 meg RAM * 512 meg vdisk swap Observations: * Turning of hz_timer patch helps lower CPU utilization footprint of the java processes, but of course, then the system never sleeps. * When running a J2EE app, it takes often over a minute to finish rendering a page to a browser. * When running a J2EE app, java consumes an entire IFL of cpu if we let it. I understand others are successfully running J2EE implimentations on mainframe Linux, so here are my questions: 1. Is J2EE a cpu resource hog for you? 2. Are you running Linux under VM or right on the LPAR? 3. Do you charge users for MIP usage? If so, how does this high CPU utilization not eat your customer alive in billed costs? 4. Does anyone have some advice on how to run J2EE services more efficiently, faster and easier on cpu? 5. Which J2EE server software for mainframe Linux do you prefer and why? 6. Lastly, why would you choose to run J2EE on mainframe Linux as apposed to some stand-alone system (Unix, Windows, Other)? Thanks folks, *Brandon Darbro ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
