gcAllowVeryLargeObjects is not effective for using more than 2GB in an array in C# Asp.NET - Stack Overflow

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I have struct as following

public struct Data
{
    public readonly long Start;
    public readonly long End;

    public Data(long start, long end)
    {
        Start = start;
        End = end;
    }
}
Data[] dataRange = new Data[150000000]; // here thrown "array dimensions exceeded supported range" exceptions. 

Array declaration supported only up to a length of 134217724. I assume 2GB is still limited even though it has gcAllowVeryLargeObjects enabled.

The same array is working fine with my separate ConsoleApplication whereas not working in Asp project.

I have struct as following

public struct Data
{
    public readonly long Start;
    public readonly long End;

    public Data(long start, long end)
    {
        Start = start;
        End = end;
    }
}
Data[] dataRange = new Data[150000000]; // here thrown "array dimensions exceeded supported range" exceptions. 

Array declaration supported only up to a length of 134217724. I assume 2GB is still limited even though it has gcAllowVeryLargeObjects enabled.

The same array is working fine with my separate ConsoleApplication whereas not working in Asp project.

• c#
• arrays
• asp
• out-of-memory
• gcallowverylargeobjects

Share Improve this question Follow asked Mar 13 at 9:35 Gowtham DharmarajanGowtham Dharmarajan 23433 silver badges1717 bronze badges 5

• Are you sure you are running in x64? What version of ASP.Net are we talking about? – JonasH Commented Mar 13 at 10:03
• @JonasH Environment.Is64BitOperatingSystem : true, Environment.Is64BitProcess : true, Debug setting is X64 & targetFramework is also 4.5 later. – Gowtham Dharmarajan Commented Mar 13 at 10:16
• What is Array.MaxLength ? – JonasH Commented Mar 13 at 10:52
• @JonasH How to check? – Gowtham Dharmarajan Commented Mar 13 at 11:22
• The same way you check any other runtime property, like writing the property value to a logfile or run use an attached debugger to inspect the value. – JonasH Commented Mar 13 at 12:06

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1 Answer 1

Sorted by: Reset to default 0

For Asp web sites, we need to add gcallowverylargeobjects key in the C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Config\machine.config file to <runtime> section. web.config is not enough.

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