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Asked: 2026-05-31T03:22:21+00:00

I’m learning about multithreading, but after reading some tutorials I’m sort of confused. I

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I’m learning about multithreading, but after reading some tutorials I’m sort of confused.
I don’t understand how multithreading can speed up an application.

By intuition, I would say multithreading slows down an application, because you constantly have to wait for those semaphores.

How and when can multithreading speed up an application, when threads can’t run concurrently?

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  1. Editorial Team

    Two ways I can think of, the first of which is probably what you mean by “parallel threading”.

    • If you have multiple CPUs or cores, they can work simultaneously if you’re running multiple threads.
    • In the single core case, if your thread ends up waiting for (synchronous) I/O, let’s say you call read() to read 100 MB from tape, another thread can get scheduled and get work done while you wait.
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