IBM User Guide for Java V7 on Windows > IBM SDK for Java

The JIT compiler

The Just-In-Time (JIT) compiler is a component of the Java™ Runtime Environment. It improves the performance of Java applications by compiling bytecodes to native machine code at run time. This section summarizes the relationship between the JVM and the JIT compiler and gives a short description of how the compiler works.

• JIT compiler overview
  The Just-In-Time (JIT) compiler is a component of the Java Runtime Environment that improves the performance of Java applications at run time.
• How the JIT compiler optimizes code
  When a method is chosen for compilation, the JVM feeds its bytecodes to the Just-In-Time compiler (JIT). The JIT needs to understand the semantics and syntax of the bytecodes before it can compile the method correctly.
• Frequently asked questions about the JIT compliler
  Examples of subjects that have answers in this section include disabling the JIT compiler, use of alternative JIT compilers, control of JIT compilation and dynamic control of the JIT compiler.

Parent: IBM SDK for Java

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