We are just finishing up an objective which includes tuning the WebSphere JVM GC Algorithm. We have four servers in the cluster. Each zLinux server (guest) has 1 JVM on it. My collegue picked four DIFFERENT GC tuning settings. The first setting was applied to the first guest's JVM. The second was applied to the second guest's JVM and so on. Each of the four guests in the cluster used a unique GC tuning settting. We ran a load test while monitoring the JVMs. We observed that the second guest performed the best. That setting was then applied to all of the guest's JVMs and the test was run again. Performance dramatically improved.
Instead of running four tests to determine which setting was best we only needed to run 1. It saved us a ton of time!
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