C++ Concurrency in Action: Practical Multithreading by Anthony Williams

Author:Anthony Williams
Language: eng
Format: epub, pdf
Publisher: Manning Publications

With this approach you no longer have the problem of unbounded threads that you have with a spawn_task that launches a new thread, and you’re no longer relying on the C++ Thread Library to choose the number of threads for you, as it does with std::async(). Instead, you limit the number of threads to the value of std::thread::hardware_concurrency() in order to avoid excessive task switching. You do, however, have another potential problem: the management of these threads and the communication between them add quite a lot of complexity to the code. Also, although the threads are processing separate data elements, they all access the stack to add new chunks and to remove chunks for processing. This heavy contention can reduce performance, even if you use a lock-free (and hence nonblocking) stack, for reasons that you’ll see shortly.

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