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.net 4.0 + w3wp.exe

Recently, we made the jump from .NET 3.5 to .NET 4.0. Now we are seeing a huge performance hit in our web application. The w3wp.exe process is frequently spiking up to 70-80% and staying there for 10+ seconds. Previously, it would only spike up to around 50%, and only then for less than a second for pretty much any of our queries. This has made our app run at about 25% efficiency.

We were previously running .NET 3.5 (32 bit) IIS 6 Windows Server 2008 64bit
and are currently running .NET 4.0 (64 bit) IIS 6 Windows Server 2008 64 bit

Any guidance on how to solve this, or why it would run worse in .NET 4.0 would be much appreciated!

radcaesar

This is a broader area to answer.

My suggestion is check your LOG. It may be because of Application Initialization, Bad code/query, Antivirus etc.,

Here are some references to trace where the problem is..........

http://stackoverflow.com/questions/2052633/w3wp-exe-using-100-cpu-where-to-start

http://www.velocityreviews.com/forums/t98410-w3wp-exe-high-cpu-utilization.html

http://forums.iis.net/p/1146821/1875065.aspx

Falco Bethke

IIS6 on 2008?

any other changes?

Josh_Blade

ASKER

Actually I typoed, IIS 6 with Windows Server 2003.

The only change between working well and working poorly was going from .NET 3.5 (32) -> .NET 4.0 (64).

Falco Bethke

is it possible to let it run .NET 32 bit?

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Josh_Blade

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Josh_Blade

ASKER

Talked with MS tech support.