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App layering and ngen.exe

Georgi Sotirov



We are migrating to server 2019 64b and wondering about this NGEN.exe. It took really long time (sometimes 3-4 hours) to finish. So which is the best script that we have to use? Currently we are using this one:


C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe update
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\ngen.exe update
C:\Windows\Microsoft.NET\Framework\v2.0.50727\ngen.exe update
C:\Windows\Microsoft.NET\Framework64\v2.0.50727\ngen.exe update


So is it needed to use both 32bit and 64bit? And which switch is best option, because "update" tooks long time and 5-6gb disk space? Is it better to use "eqi" instead of "update"?


Thank you!

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