Benchmarking new go routine vs pool

pool_bench_test.go

package wrkpool

import (
	"sync"
	"testing"
)

const RunCount = 10000

func BenchmarkTestNewRoutine(b *testing.B) {
	for i := 0; i < b.N; i++ {
		var wg sync.WaitGroup
		for j := 0; j < RunCount; j++ {
			wg.Add(1)
			go func() {
				SomeJob()
				wg.Done()
			}()
		}
		wg.Wait()
	}
}

func BenchmarkTestPool(b *testing.B) {
	for i := 0; i < b.N; i++ {
		var wg sync.WaitGroup
		pool := make(chan struct{}, 25)

		// fill up the pool
		for i := 0; i < 25; i++ {
			pool <- struct{}{}
		}

		for j := 0; j < RunCount; j++ {
			<-pool
			wg.Add(1)
			go func() {
				SomeJob()
				pool <- struct{}{}
				wg.Done()
			}()
		}
		wg.Wait()
	}
}

func SomeJob() int {
	var result int
	for i := 0; i < 10000; i++ {
		result += i
	}
	return result
}

RunCount at 1000

$ go test -bench . -benchmem
testing: warning: no tests to run
PASS
BenchmarkTestNewRoutine-8       2000        912813 ns/op          30 B/op          1 allocs/op
BenchmarkTestPool-8             2000        945420 ns/op         112 B/op          2 allocs/op
ok      github.com/zabawaba99/wrkpool   3.915s

$ go test -bench . -benchmem -benchtime 30s
testing: warning: no tests to run
PASS
BenchmarkTestNewRoutine-8      50000        924478 ns/op          16 B/op          1 allocs/op
BenchmarkTestPool-8            50000        976914 ns/op         112 B/op          2 allocs/op
ok      github.com/zabawaba99/wrkpool   113.978s

---

RunCount at 10000

$ go test -bench . -benchmem
testing: warning: no tests to run
PASS
BenchmarkTestNewRoutine-8        200       8829387 ns/op        3253 B/op          8 allocs/op
BenchmarkTestPool-8              200       9323445 ns/op         112 B/op          2 allocs/op
ok      github.com/zabawaba99/wrkpool   5.483s

$ go test -bench . -benchmem -benchtime 30s
testing: warning: no tests to run
PASS
BenchmarkTestNewRoutine-8       5000       8819895 ns/op          27 B/op          1 allocs/op
BenchmarkTestPool-8             5000       9365598 ns/op         112 B/op          2 allocs/op
ok      github.com/zabawaba99/wrkpool   92.814s