By Marcus Hirt, Marcus Lagergren
Choked with cautious step by step directions and lots of screenshots, this instructional indicates you JRockit and the way to get the main from it. All key options within the JRockit JVM, equivalent to code iteration, reminiscence administration and different internals are brought. functionality facets of Java are mentioned intimately. an entire consultant to exploit the instruments within the JRockit undertaking keep watch over suite is usually integrated, and lots more and plenty extra. This e-book is for intermediate to complicated Java builders, who are looking to display screen, diagnose, profile and increase the functionality in their Java functions. it's also for those who are looking to comprehend extra concerning the inner workings of a latest Java digital computer or adaptive runtime. components of the booklet are compatible as direction fabric for schooling approximately runtimes.
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Additional resources for Oracle JRockit: The Definitive Guide
Example text
If you feel yourself breaking out in a cold sweat over the assembly listings that are displayed in a few places throughout the text, don't worry too much. They are not necessary to understand the big picture. Static compilation In the early days of Java, several simple "brute force" approaches to getting around the bytecode performance problem were made. These usually involved static compilation in some form. Usually, an entire Java program was compiled into native code before execution. This is known as ahead-of-time compilation.
Variants of these exist in all hardware architectures. Depending on the type of call, the format of the call instruction varies. In object-oriented languages, virtual method dispatch is usually compiled as indirect calls (that is the destination has to be read from memory) to addresses in a dispatch table. This is because a virtual call can have several possible receivers depending on the class hierarchy. A dispatch table exists for every class and contains the receivers of its virtual calls. A static method or a virtual method that is known to have only one implementation can instead be turned into a direct call with a fixed destination.
We covered installing JRockit and provided insights into common pitfalls when migrating a Java application from one JVM to another. The different categories of command-line flags that JRockit supports were explained, and we showed examples of how to find the version numbers for the different components of the JRockit JDK. Finally, we provided pointers to additional help. [ 18 ] Adaptive Code Generation This chapter covers code generation and code optimization in a JVM runtime environment, both as a general concept as well as taking a closer look at the JRockit code generation internals.