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I'm experimenting with threads and Fibers in D and I was wondering if it is possible to run a Fiber on a different CPU as the main thread is running. And if this is not the case then what would be the reason of using Fibers over Threads. (Practical examples are very welcome)
I tried to write some initial program with Fibers where I switch to the next fiber after some time. Howhever I noticed that the cpu usage stays only on one cpu.
The documentation of D states:
Please note that there is no requirement that a fiber be bound to one specific thread. Rather, fibers may be freely passed between threads so long as they are not currently executing.
Does this mean that I have to provide a thread for the fiber to run on if i want it to use a different CPU ? If this is the case then I don't see the purpose.
Thanks in advance!
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Fibers are threads—sequential processes that we can spawn and synchronize with others. However, usually when we say “thread” we mean those threads implemented by the operating systems, while fibers (AKA lightweight threads or user-mode threads) are implemented in user mode.
Green threads, userland threads, goroutines or fibers, they have many names but for simplicity's sake I'll refer to them all as green threads from now on. In this article I want to explore how they work by implementing a very simple example where we create our own green threads in 200 lines of Rust code.
In computer science, a fiber is a particularly lightweight thread of execution. Like threads, fibers share address space. However, fibers use cooperative multitasking while threads use preemptive multitasking.
A fiber is a unit of execution that must be manually scheduled by the application. Fibers run in the context of the threads that schedule them. Each thread can schedule multiple fibers. In general, fibers do not provide advantages over a well-designed multithreaded application.
Fibers are a lightweight mechanism for cooperative multitasking, and run in the same thread as their creator / caller. If you need to run a task on a different CPU, use threads. The purpose of fibers is to provide fast cooperative context switching and mechanisms for implementing patterns such as coroutines.
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