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Knowing JIT

Just-In-Time Compiler is a special type of compiler, or component of an environment that combines the power of compilation and interpretation to boost performance. It is a mid-way between compiling and interpreting. Although the term was coined by James Gosling later, John McCarthy and Ken Thompson are the pioneers in developing this technology.


A JIT compiler’s execution is done at two stage: compile time & run time.

  1. Compile Time: A program is turned into an intermediate form (bytecode). At this level, the the intermediate code is quite slow.
  2. Run Time: Here, the bytecode is powered by JIT to be compiled targeting CPU-specific architecture. The bytecode is turned into machine code (known as dynamic compilation). As a result, performance dramatically upgrades.
credit: Tishan’s Wall


  • Speed-boost
  • Interpreter-like flexibility
  • Cache optimization
  • Better performance than interpreter and static compiler


  • JVM (Java)
  • Common Language Runtime(C#)
  • Dalvik Virtual Machine
  • Android Runtime
  • PHP (from version 8.x)


Published by Farial Mahmod Tishan

Life-long learner. Developing Flutter apps on Parrot Linux OS .

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