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MJIT is a ‘Just-in-Time Compiler’ available in Ruby 2.6

December 5, 2018blogBy Tonya Smyrnova
MJIT is a 'Just-in-Time Compiler' available in Ruby 2.6. Syndicode news

We know a lot about Ruby! And today we’d like to explain you Ruby new feature that is now available in Ruby 2.6. This is MJIT. It will compile instructions that are used often into binary code. The result is an optimized binary which runs your code faster.

What is MJIT? It stands for “Method Based Just-in-Time Compiler”. Ruby compiles your code into YARV instructions, these instructions are run by the Ruby Virtual Machine. Ruby 2.6 comes with a set of JIT-specific options that will help us discover exactly how it works. You can see these options by running ruby --help.

This is how the JIT works:

  1. Count method calls
  2. When one method is called 5 times (default for jit-min-calls) trigger JIT
  3. A C file that contains the instructions for this method is created (these are YARV instructions, but inlined)
  4. Compilation happens in the background (unless --jit-wait) using a regular C compiler like GCC
  5. When the compilation is done the resulting shared library file is used when this method is called

The goal of MJIT is to make Ruby faster. MJIT is a “Just-in-Time Compiler” available in Ruby 2.6, it can be enabled with the --jit flag. MJIT is promising & can speed up some small programs, but there is still a lot of work to do!

The detailed code for that method you can find here and to track all the interesting open source Ruby projects, keep an eye on our monthly Rails digest!

backendcodecompilerJITJust-in-Time CompilerMJITMJIT ExplainedrailsRoRrubyRuby 2.6.Ruby developmentRuby guideRuby methodsruby on railsRuby performance
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About the author

Tonya Smyrnova

Marketing manager and a tech writer at Syndicode who speaks more than four languages.

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