What is JIT and how is works ?
Answer / alb.shah
When compiling the source code to managed code, the
compiler translates the source into Microsoft intermediate
language
(MSIL). This is a CPU-independent set of instructions that
can efficiently be converted to native code. Microsoft
intermediate language (MSIL) is a translation used as the
output of a number of compilers. It is the input to a just-
in-time
(JIT) compiler. The Common Language Runtime includes a JIT
compiler for the conversion of MSIL to native code.
Before Microsoft Intermediate Language (MSIL) can be
executed it, must be converted by the .NET Framework just-
in-time (JIT)
compiler to native code. This is CPU-specific code that
runs on the same computer architecture as the JIT compiler.
Rather
than using time and memory to convert all of the MSIL in a
portable executable (PE) file to native code. It converts
the MSIL
as needed whilst executing, then caches the resulting
native code so its accessible for any subsequent calls
JIT
----
The Just-In-Time (JIT or JITter) compiler, converts the MSIL
(Microsoft Intermediate Language) code into the native code
(CPU
Specific code).
The .NET runtime/Common Language Runtime (CLR) ships three
different classes of JITters.
<li><b>Econo-JIT</b>: This compiler converts the MSIL code
into native code without any optimizations.
<li><b>Standard-JIT</b>: This compiler takes the MSIL code
and optimizes it. So this compiler requires lot of
resources like,
time to compile, larger memory footprint, etc.
<li><b>PreJIT</b>: This is based on the Main JIT and it
works like the traditional compilers rather than Just-In-
Time
compilers. This compiler is used at the time of
installation.
JIT does not compiles hole code ,only the code is to be
executed is compiled
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