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#Intime definition code
Newer programs will make use of JIT compilers, which generate code while the program is running. JIT compilers contrast different compiler types such as a traditional compiler, which will compile all code to a machine language before a program starts to run. Translating source code into a language that a host CPU natively understands typically means a faster, more easily readable instruction set. The compiled code, or bytecode sequences, are turned into a faster, more readable machine language, or native code. A common way to say this is that a JIT compiler compiles code on the fly, or in other words, just in time.
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Just-in-time compilers can be used for performance optimization to improve application runtime.Īs opposed to other compiler types, the main defining characteristic of a JIT compiler is that a JIT compiler runs after a program starts and compiles code. Typically, compilers are key in deciding the speed of an application for developers and end users. Gillis, Technical Writer and EditorĪ just-in-time (JIT) compiler is a program that turns bytecode into instructions that can be sent directly to a computer's processor (CPU).