Parallel processing in golang

Regarding GOMAXPROCS, you can find this in Go 1.5's release docs:

By default, Go programs run with GOMAXPROCS set to the number of cores available; in prior releases it defaulted to 1.

Regarding preventing the main function from exiting immediately, you could leverage WaitGroup's Wait function.

I wrote this utility function to help parallelize a group of functions:

import "sync"

// Parallelize parallelizes the function calls
func Parallelize(functions ...func()) {
    var waitGroup sync.WaitGroup
    waitGroup.Add(len(functions))

    defer waitGroup.Wait()

    for _, function := range functions {
        go func(copy func()) {
            defer waitGroup.Done()
            copy()
        }(function)
    }
}

So in your case, we could do this

func1 := func() {
    f(0)
}

func2 = func() {
    f(1)
}

func3 = func() {
    f(2)
}

Parallelize(func1, func2, func3)

If you wanted to use the Parallelize function, you can find it here https://github.com/shomali11/util

This answer is outdated. Please see this answer instead.

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Your code will run concurrently, but not in parallel. You can make it run in parallel by setting GOMAXPROCS.

It's not clear exactly what you're trying to accomplish here, but it looks like a perfectly valid way of achieving concurrency to me.