fan out in go

In Go, fanning out refers to the process of spawning multiple goroutines that work concurrently to perform some task. This technique can help improve the performance of your application by enabling parallelism.

To fan out in Go, you can use goroutines and channels. Here's an example of how to fan out a computation using a worker pool:

main.go
package main

import (
	"fmt"
)

func worker(id int, jobs <-chan int, results chan<- int) {
	for j := range jobs {
		fmt.Println("worker", id, "processing job", j)
		results <- j * 2
	}
}

func main() {
	const numJobs = 5
	jobs := make(chan int, numJobs)
	results := make(chan int, numJobs)

	// create worker pool
	const numWorkers = 3
	for w := 1; w <= numWorkers; w++ {
		go worker(w, jobs, results)
	}

	// enqueue jobs
	for j := 1; j <= numJobs; j++ {
		jobs <- j
	}
	close(jobs)

	// collect results
	for a := 1; a <= numJobs; a++ {
		fmt.Println("result:", <-results)
	}
}
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In this example, we create a worker pool with 3 workers. The worker function processes jobs from the jobs channel and sends the results to the results channel. The main function enqueues 5 jobs and then collects the results.

By fanning out the computation using the worker pool, we can process multiple jobs concurrently and improve the overall performance of the application.