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JIT compilation refers to a method where program code is translated into machine code on demand, allowing for runtime optimization. This method significantly improves execution speed and reduces application startup time, widely used in many modern programming languages.
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JIT compilation translates program code into machine code during execution and uses runtime data to optimize frequently executed paths.
Just-in-time compilation grew from combining interpretation and static compilation in programming-language research. Systems such as Java HotSpot popularized adaptive runtime optimization in widely used runtimes.
Start with a flexible translator and observe usage. Give frequent paths a specialized, fast translation while keeping rare paths flexible and interpreted.
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Translation happens while the program runs.
An optimization is withdrawn when its assumptions stop holding.
JIT can provide high sustained execution speed without compiling for every target platform in advance. Warm-up time, memory use, and runtime variation must fit the workload.
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