NET Common Language Runtime (CLR). Defining JIT requires looking beyond the acronym itself to understand its operational philosophy.
How JIT Compilation Technology Works at Runtime
Because the compilation happens during runtime, the initial launch of an application might be slightly slower than a fully pre-compiled alternative. Instead of converting all code before execution, JIT translates code on the fly, only when it is needed.
JIT, conversely, focuses on runtime optimization. The line between them is blurring, however, with techniques like tiered compilation and hybrid approaches becoming common, where the system uses AOT for quick startup and JIT for maximum throughput.
How JIT Compilation Technology Works at Runtime
JavaScript engines, such as Google's V8 used in Chrome, rely heavily on JIT to deliver the high performance required for complex web applications. AOT translates the entire program into native code before it is ever run, which results in fast startup times and predictable resource usage.
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