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Where are the pre-JITted assemblies stored and how long?

Posted on 2004-08-01
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Last Modified: 2008-01-09
Hello Friends,

I was reading that GAC stores the pre-JITted assemblies too, apart from the global assemblies. Is that true? Why are they stored in GAC if they are not global? How long are they stored here?

Also, if GAC stores ever the regular pre-JITted assemblies, why don't I see the assemblies that I create on my machine. I use the default JITter.

Thanks,
Srinivas
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Question by:srinivas_vemla
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Expert Comment

by:gregoryyoung
ID: 11689591
it happens when you run ngen.exe which creates a full native image of the managed assembly. There is a seperate part of the gac which is reserved to hold native images http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cptools/html/cpgrfnativeimagegeneratorngenexe.asp 
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Author Comment

by:srinivas_vemla
ID: 11689800
Why would I run Ngen? Is that the install-time JIT functionality?
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Author Comment

by:srinivas_vemla
ID: 11689813
Sorry, please ignore my last comment...

I just meant to ask, what these "Native images" are and how are they different from normal assemblies?

Also, say I have a HelloWorld.cs, and I compile it and create an assembly and then run it. The JIT has to cache it, right? Where is this cached?

Thanks,
Srinivas
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LVL 37

Accepted Solution

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gregoryyoung earned 100 total points
ID: 11689838
they are precompiled to native code ...

JIT is just in time compiling ... the assembly is compiled as needed (generally stored in memory)

with an ngen'ed image ... all of that compilation is all pre-done ... thus JIT is not performed.
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