


Why Does My 64-bit .NET App Still Throw an OutOfMemoryException Despite 16GB RAM?
Why Does My .NET Application Encounter an Out of Memory Exception Despite Having 16GB Installed?
In this article, we address a prevalent issue where a C# application triggers an Out of Memory exception, despite having ample physical memory (16GB) available. After upgrading from a 32-bit machine with 3GB memory, where such exceptions occurred, the problem persists, leading to speculation about potential Windows memory limits.
Understanding the Problem
Out of Memory exceptions arise when the application's memory usage exceeds the available memory. In this case, the exception appears at the 1.3GB threshold, which is less than the typical single-object memory limit of 2GB. This suggests that the issue lies elsewhere.
The Impact of Target Architecture
The key to resolving this issue lies in the target architecture of the compiled code. It's essential to note that 32-bit and 64-bit architectures have significant differences in terms of addressable memory space.
Resolving the Issue
To benefit from the extended memory capabilities of a 64-bit system, it is crucial to compile the code targeting the 64-bit architecture. By doing so, the application can allocate memory beyond the 2GB limit, eliminating the Out of Memory exception.
Additional Considerations
It's important to reiterate that Out of Memory exceptions can also occur if a single collection in CLR (e.g., List
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