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
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