Which Thread on Which CPU Core

Wed, 05 Aug 2026 21:28:46 +0530

Let’s suppose your computer has 4 CPU cores and you decide to create 2 threads.

Will they be created on the same core or on different cores?

It sounds like a simple question, and you might already know the answer.

But how do we actually verify that answer with code?

Finding the Number of CPU Cores

C++ provides std::thread::hardware_concurrency(), which returns the number of hardware threads (logical CPUs) available to your program.