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Will a C# Program Ever Find a Duplicate GUID?

Susan Sarandon

Jan 22, 2025 pm 01:31 PM

Will a C# Program Ever Find a Duplicate GUID?

Testing GUID Uniqueness in C#

A C# program was created to test the widely held belief of GUID uniqueness. Initial attempts using sequential GUID generation and comparison failed to find duplicates. To address this, a more comprehensive approach was implemented.

This enhanced program leverages multithreading to generate and compare a large number of GUIDs concurrently. It continuously adds GUIDs to a growing in-memory collection ("heap") and simultaneously searches for duplicates.

The program's execution continues until a system OutOfMemoryException occurs, signifying that the available memory has been completely consumed by the GUIDs. This exhaustive approach avoids potential biases associated with pre-allocated memory. The Parallel library is used to optimize performance across multiple CPU cores.

The program's persistent operation, without encountering duplicate GUIDs, strongly suggests that the probability of collision within the tested memory limits is exceptionally low. While designed to run indefinitely, monitoring the program's output confirms the continued absence of any GUID collisions.

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