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The CLR (Common Language Runtime) is the execution environment for code written for the .NET Framework. The CLR manages the execution of .NET code, including memory allocation and garbage collection (which helps avoid memory leaks), security (including applying differing trust levels to code from different sources), thread management, enforcing type-safety, and many other tasks.

The CLR works with every language available for the .NET Framework, so there is no need to have a separate runtime for each language. Code developed in a .NET language is compiled by the individual language compiler (such as the Visual Basic .NET compiler) into an intermediate format called Intermediate Language (IL). At runtime, this IL code generated by the compiler is just-in-time (JIT) compiled by the CLR into native code for the processor type the CLR is running on.

This AspNetClrJitTest monitors the JIT compilation performed by the CLR. This compilation provides the flexibility of being able to develop with multiple languages and target multiple processor types while still retaining the performance of native code at execution time.

Measurement	Description	Measurement Unit	Interpretation
Time_in_jit	Indicates the percentage of elapsed time spent in JIT compilation; a JIT compilation phase is the phase when a method and its dependencies are being compiled.	Percent
IL_jit_rate	Indicates the rate at which IL bytes are jitted.	KB/Sec
Std_jit_failures	Indicates the number of methods the JIT compiler has failed to JIT during the last measurement period.	Number	An unusually high value may indicate a sudden increase in JIT failures in the application.
IL_data_jitted	Indicates the total IL bytes jitted per second during the last measurement period.	KB/Sec
IL_methods_jitted	Indicates the methods compiled Just-In-Time (JIT) by the CLR JIT compiler during the last measurement period.	Number