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JIT compiler and execution

I am confused with the JIT compiler,

  • What is a JIT compiler?
  • Does the JIT compiler compile byte codes before each execution, or every time the JVM boots?
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4 answers

JIT means "Just In Time". This is a compiler that converts Java bytecode into native machine code as your program runs.

Sun JIT will not compile all of your bytecode before each run of the Java program; it contains very complex logic to decide when to compile parts of the bytecode, one of the criteria that it uses is how often the code is executed.

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: http://java.sun.com/developer/onlineTraining/Programming/JDCBook/perf2.html

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The JIT compiler was an external compiler that ships with Java 1.1. This term is now outdated. Java comes with the HotSpot JVM, which compilation is built into.

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Source: https://habr.com/ru/post/1751426/

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