The Native Image Generator creates a native image from a managed assembly and installs it into the native image cache on the local computer. The native image cache is a reserved area of the global assembly cache. Once you create a native image for an assembly, the runtime automatically uses that native image each time it runs the assembly. You do not have to perform any additional procedures to cause the runtime to use a native image. Running Ngen.exe on an assembly allows the assembly to load and execute faster, because it restores code and data structures from the native image cache rather than generating them dynamically.
Remarks
Ngen.exe does not use standard assembly probing rules to locate the assemblies you specify on the command line. Ngen.exe looks only in the current directory for assemblies that you specify. Therefore, to allow Ngen.exe to locate your assemblies, you should either set your working directory to the directory that contains the assemblies you want to create native images for or specify exact paths to the assemblies.
A native image is a file containing compiled processor-specific machine code. Note that the native image that Ngen.exe generates cannot be shared across Application Domains. Therefore, you cannot use Ngen.exe in application scenarios, such as ASP.NET, that require assemblies to be shared across application domains.
Pre-compiling assemblies with Ngen.exe can improve the startup time for applications, because much of the work required to execute code has been done in advance. Therefore, it is more appropriate to use Ngen.exe for client-side applications where you have determined that the CPU cycles consumed by JIT compilation cause slower performance.
Because there are many factors that affect the startup time of an application, you should carefully determine which applications would benefit from the use of Ngen.exe. Experiment by running both a JIT-compiled and a pre-compiled version of a candidate assembly in the environment in which it will be used. This will allow you to compare the startup times for the same assembly executing under different compilation schemes.
Note To run Ngen.exe, you must have administrative privileges.
Company: Microsoft
Website: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cptools/html/cpgrfnativeimagegenera
Price:
Is Free: Yes
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