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Ergonomics in the 5.0 Java Virtual Machine

JavaFAQ Home » Java Installation, tunning, options... Go to all tips in Java Installation, tunning, options...

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Getting the best performance out of the JVM has often required detailed hand tuning of command line options. Yet many users never set command line options for performance. In order to give the best possible performance in a variety of situations Sun Microsystems has improved the performance of the JVM even when no command line options are used.

In J2SE 5.0 the default selection for the garbage collector, heap size, and runtime compiler are now chosen automatically. These new selections better match the needs of different types of applications while requiring less command line tuning.

In addition a different way of tuning the heap has been added for the throughput garbage collector. This new tuning allows the user to specify performance and memory utilization criteria to dynamically tune the sizes of the heap. This "self tuning" behavior is referred to in this document as "ergonomics". For more on ergonomics please see the Ergonomics in the 5.0 Java Virtual Machine document.

The performance improvements from ergonomics are significant. Here we compare SPECjbb2000 performance between J2SE 1.4.2 and J2SE 5.0.

Actual graphs and full article please read here

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