Large array support in ASP.NET

Asked 29/10, 2012 at 22:37 Answered 10/3, 2014 at 17:8

Recently with 4.5 .NET support, users can allocate more than 2 GB of memory for an object. In order to do that users can set the gcAllowVeryLargeObjects to true in the app.config file, and things would work fine.

However I am having difficulty in finding this setting for ASP.NET. I have an web site for which I need to test if this is really supported in our web site. I know that the VS inbuilt server is a 32 bit process. So it users can't simply launch the website and test it for large arrays.

Is this even possible with ASP.NET? I am using IIS7 to host my website.

Conceivable answered 29/10, 2012 at 22:37 Comment(4)

Have you considered using IIS Express instead of Casini (VS's internal server)? – Constituency 29/10, 2012 at 22:46

Im trying to deploy the website on an IIS7 server on Windows7 x64 bit machine. – Conceivable 30/10, 2012 at 15:15

I meant IIS Express for your development environment. – Constituency 30/10, 2012 at 16:15

In VS2012, if I make my target platform for the web app as x64, the webpage just crashes with this error "Could not load file or assembly 'WebApplication1' or one of its dependencies. An attempt was made to load a program with an incorrect format." – Conceivable 30/10, 2012 at 16:49

Acording to MSDN you can setup it at web.config as:

<configuration>
  <runtime>
    <gcAllowVeryLargeObjects enabled="true" />
  </runtime>
</configuration>

but its says:

true: Arrays greater than 2 GB in total size are enabled on 64-bit platforms.

so its not work on 32bit, meaning that you also need to run your pool on 64-bit.

ref: http://msdn.microsoft.com/en-us/library/hh285054.aspx

Flocculent answered 29/10, 2012 at 22:44 Comment(5)

I tried that but allocating more than 1 gig ends up with out of mem exception. Is there anything else than gcAllow.. and making app pool to 64bit? – Conceivable 30/10, 2012 at 14:59

@Conceivable Is your pool 64bit running ? and your site the same ? – Flocculent 30/10, 2012 at 15:26

Yes it is.. Programmatically, on the code behind I can see that IntPtr.Size is 8. – Conceivable 30/10, 2012 at 16:46

@Conceivable You can also see it with process explorer, its show if its run on 64bit or not. If you can run the process explorer from sysinternals to see how memory is use. Also check if you have place an y memory limits on the pool that make it restart. – Flocculent 30/10, 2012 at 17:3

I just want to know if large arrays (>2gb) is supported in ASP.NET or not. – Conceivable 30/10, 2012 at 17:39

For me setting gcAllowVeryLargeObjects in the application web.config only worked when put in machine.config

Alkalify answered 10/3, 2014 at 17:8 Comment(0)

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