Wednesday, March 28, 2012

Speeding up PowerCLI

As you may have seen, I like PowerCLI. Only thing is, it's not the fastest to start up, and running the first cmdlet takes some time. After that, it goes fine.

The first tip from the VMware PowerCLI Blog is to go to:

Windows > Control Panel > Internet Options > Advanced > Security > Check for publisher's certificate revocation and uncheck that box (also helps the SQL Server Management Studio start up faster if it is not connected to the internet).

Unfortunately, this did not help me so much with running the first cmdlet. So I was mighty glad that I came across this article from vNugglets to speed up PowerCLI 5. This led to another VMware PowerCLI Blog article with all the steps for earlier versions.

Basically, the issue is that due to the fact that the .Net framework compiles the underlying code on first use, so you can precompile things to speed up first run:

Open up an administrative command prompt, and run the following commands:

C:\Windows\Microsoft.NET\Framework\v2.0.50727\ngen.exe install "VimService41.XmlSerializers, Version=4.1.0.0, Culture=neutral, PublicKeyToken=10980b081e887e9f"

C:\Windows\Microsoft.NET\Framework\v2.0.50727\ngen.exe install "VimService40.XmlSerializers, Version=4.0.0.0, Culture=neutral, PublicKeyToken=10980b081e887e9f"

C:\Windows\Microsoft.NET\Framework\v2.0.50727\ngen.exe install "VimService25.XmlSerializers, Version=2.5.0.0, Culture=neutral, PublicKeyToken=10980b081e887e9f"

If you are running on 64-bit OS, you need to run the following as well:

C:\Windows\Microsoft.NET\Framework64\v2.0.50727\ngen.exe install "VimService41.XmlSerializers, Version=4.1.0.0, Culture=neutral, PublicKeyToken=10980b081e887e9f"

C:\Windows\Microsoft.NET\Framework64\v2.0.50727\ngen.exe install "VimService40.XmlSerializers, Version=4.0.0.0, Culture=neutral, PublicKeyToken=10980b081e887e9f"

C:\Windows\Microsoft.NET\Framework64\v2.0.50727\ngen.exe install "VimService25.XmlSerializers, Version=2.5.0.0, Culture=neutral, PublicKeyToken=10980b081e887e9f"

This needs to be done once, and works for all users and applications.

I did a test on one setup, using the test  on the PowerCLI blog which is:

Measure-Command { Get-VMHost } | fl TotalSeconds

This test went from 24.4 seconds to 4.6 seconds! More than 5 times as fast!! Again, thanks go to vNugglets!

2 comments:

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  2. How do you get the arguments to pass into ngen?
    I'm using PowerCLI 6.0.. How should i change the command?

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