What Is a Concurrency Control?

Concurrency vs. parallelism

Concurrency is the process of executing more than one task seemingly at the same time. Concurrency increases the application’s throughput by maximizing the utilization of a CPU core. It creates the illusion of parallel execution, but the operating system allocates a slice of the CPU time to the individual tasks, braiding them rather than processing them simultaneously. This braided processing is called context switching. Ultimately, concurrency is about dealing with a lot of things at once.

In contrast, parallelism is about doing a lot of things at once. Parallelism is the process of executing more than one task at the same time, with each task running on a dedicated CPU core.