Best way to implement global counters for highly concurrent applications?

Question

What is the best way to implement global counters for a highly concurrent application? In my case I may have 10K-20K go routines performing \"work\", and I want to count th

Answer 1

If your work counter types are not dynamic, i.e. you can write them all out upfront, I don't think you'll get much simpler or faster than this.

No mutex, no channel, no map. Just a statically sized array and an enum.

type WorkType int

const (
    WorkType1 WorkType = iota
    WorkType2
    WorkType3
    WorkType4
    NumWorkTypes
)

var workCounter [NumWorkTypes]int64

func updateWorkCount(workType WorkType, delta int) {
    atomic.AddInt64(&workCounter[workType], int64(delta))
}

Usage like so:

updateWorkCount(WorkType1, 1)

If you need to sometimes work with work types as strings for display purposes, you can always generate code with a tool like stringer