有什么简单的方法可以在 node.js 中运行并行 for 循环吗？

Question

Coming from C#, I use the Parallel library. an example for a parallel for loop in c# would be:

Parallel.ForEach(sourceCollection, item => Process(item));

In node.js i couldn't find anything simillar. I know the worker-threads library, but isn't there any simpler way to run a loop without implementing a thread pool behind the scenes?

Answer 1

Node.js does not have any built-in mechanism for running a synchronous loop in parallel. You would have to find a module that can already do that or manually create your own iterator that fired up a workerThread for each invocation of the loop (or used a pool of threads) and then communicate back the results from the workerThread.

If I were implementing your loop and needed to run multiple synchronous Process(item) operations in parallel, I would probably create a work queue and a pool of workers servicing the queue and I'd put a promise returning wrapper around Process() . Inside that wrapper, it would add it to the workQueue, register a callback with the queue for completion and then when it completes resolve the promise it returned. You would then use Promise.all() to collect all the results in order. Inside the workQueue, you'd have a set of workers grabbing an item from the queue, running it in a separate thread, then communicating back the result, then grabbing the next item and so on.