Hands-On High Performance with Go

Benchmark execution

Benchmarks in Go use the axiom of starting with the word Benchmark (with a capital B) in the function call to denote that they are a benchmark and that they should use the benchmark functionality. To execute the benchmarks that you've defined for your code in your test package, you can use the -bench=. flag in your go test execution. This testing flag ensures all your benchmarking tests are run. An example of a benchmark is shown in the following code block:

package hello_test import (     "fmt"     "testing" ) func BenchmarkHello(b *testing.B) { // Benchmark definition     for i := 0; i < b.N; i++ {         fmt.Sprintf("Hello High Performance Go")    } }

In this (admittedly simple) benchmark, we are iterating over our fmt.Sprintf statement ...