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Java JIT Compilation with JITWatch.

Oracle’s Java HotSpot VM is equipped with a highly advanced just-in-time (JIT) compiler. This means that the class files (which are compiled from Java source code) are further compiled at runtime, and they can be turned into very highly optimized machine code. This optimized code runs extremely fast—usually as fast as (and, in certain cases, faster than) compiled C/C++ code. The JIT compiler is, therefore, one of the most important parts of Java HotSpot VM, and yet many Java developers do not know much about it or how to check that their applications work well with the JIT compiler. Fortunately, a new open source tool called JITWatch is being developed to give developers much better insight into how the JIT compiler treats their code. For most effective use, the JITWatch tool relies on developers already understanding the basic mechanisms and terminology of JIT compilation. A new open source tool called JITWatch is being developed to give developers much better insight into how the JIT c…

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